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LT8364EMSE - 60V 4A Boost/SEPIC/Inverting Converter | Analog Devices
The Analog Devices LT8364EMSE is a current-mode DC/DC converter with an integrated 60V, 4A switch, operating from a 2.8V to 60V input. Packaged in a 16-lead (12-pin active) MSOP with an exposed pad (MSE), the device uses a unique single feedback pin architecture that supports boost, SEPIC, and inverting configurations without external components to select topology. Headline parameters include a 60V maximum switch voltage, 4A peak switch current, and 9uA Burst Mode quiescent current for high efficiency at light loads. A boost converter is a switching DC/DC topology that produces an output voltage higher than the input. A SEPIC (Single-Ended Primary Inductor Converter) topology produces a non-inverted output that can be above, below, or equal to the input. An inverting (buck-boost) converter produces an output of opposite polarity to the input. The LT8364 family belongs to the broader category of switching regulators -> DC-DC converters -> voltage regulators -> power management ICs -> semiconductors, integrating the power switch and control loop on-chip to simplify design. Key features include programmable 9uA Burst Mode quiescent current for battery-powered applications, 15mV typical output ripple in Burst Mode operation, an internal 2MHz oscillator (programmable 200kHz to 2MHz via RT pin), and an EN/UVLO pin that serves both as enable and accurate undervoltage lockout threshold. The exposed pad provides low thermal resistance (theta_JE ~ 9C/W on the demo board layout) by soldering to a continuous copper ground plane, enabling reliable operation at high switch currents. Internally, the LT8364 uses a constant-frequency peak current-mode control architecture with a precision reference and internal loop compensation. The single FB pin with its reference set above and below ground enables both positive (boost/SEPIC) and negative (inverting) output voltages from the same silicon, eliminating topology-specific feedback networks. The 60V switch rating supports harsh industrial and automotive input buses, including load-dump and cold-crank transients. Typical applications include industrial 24V/28V bus boost converters to 36V or 48V, automotive ECU supply rails (SEPIC for pre-regulator or inverting for sensor bias), battery-powered portable instruments needing ultra-low 9uA quiescent current, and isolated supply front-ends using a 1:1 transformer in SEPIC topology. The wide VIN range also supports solar MPPT and PoE auxiliary rails. When designing with the LT8364EMSE, prioritize thermal management: the exposed pad MUST be soldered to a continuous copper ground plane under the device, and power-ground components should be tied to the copper exiting near the EN/UVLO and SW pins. Inductor selection (datasheet recommends Coilcraft or equivalent with low DCR) and input/output capacitor ESR directly affect efficiency and ripple. This page synthesizes ADI manufacturer data, real-time distributor pricing, drop-in alternative parts from the LT8364 family, and practical design notes not consolidated on the LT8364 datasheet.
LT8364HMSE#PBF - 60V, 4A Boost/SEPIC/Inverting DC/DC Converter | ADI
The Analog Devices LT8364HMSE#PBF is a current-mode DC/DC switching regulator with an integrated 60V, 4A power switch, packaged in a 12-lead exposed-pad MSOP (MSE) with thermally enhanced top covering over the die. Operating from a wide 2.8V to 60V input, the device delivers a positive fixed or adjustable output of 1.6V to 60V in boost or SEPIC topologies, and supports inverting configurations through its unique single-feedback-pin architecture. Burst Mode operation holds quiescent current as low as 9 µA, preserving efficiency at light loads while keeping typical output ripple below 15 mV. A switching DC/DC converter (switch-mode power supply, SMPS) is a power management integrated circuit that uses a power switch (transistor), energy-storage inductor, and output capacitor to convert one DC voltage level to another with high efficiency - typically 85-95% versus 30-50% for a linear regulator. Within the SMPS taxonomy the LT8364 sits in the non-isolated single-ended family (boost, buck-boost/SEPIC, inverting) rather than the isolated flyback/forward family. Its current-mode control and high-side drive architecture make it well suited to industrial, automotive, and telecom rails where input voltage can vary widely and the converter must tolerate transients without latch-up. Key features include a 2 MHz default switching frequency (programmable from 1.4 MHz to 2 MHz via RT resistor), 60V absolute maximum switch rating, internal 4A peak switch current, low-IQ Burst Mode operation, internal soft-start, thermal shutdown, and an exposed-pad package rated for high dissipation. The single FB pin simplifies compensation and supports positive or negative feedback configurations by component selection. The device uses current-mode control with a 60V N-channel MOSFET switch and a synchronous high-side drive output for external P-MOSFET or PNP pass-element architectures in some configurations. The internal reference is trimmed for accuracy, and the MSOP-12 exposed-pad package provides a low junction-to-ambient thermal resistance suitable for multi-watt dissipation at moderate ambient temperatures. Typical applications include industrial 24V/48V to point-of-load boost converters, automotive 12V battery to higher-voltage rails for sensors and LED drivers, SEPIC supplies for USB-PD and bias rails, inverting converters for op-amp negative supplies, and high-voltage bias generators for IGBT gate drives. When designing with the LT8364, ensure the input bulk capacitor ESR is low enough to handle the 4A switch current pulses without excessive voltage ripple. For SEPIC and inverting topologies a coupled or two-inductor network plus an AC coupling capacitor is required - follow the datasheet reference design BOM for inductor values. Estimated: at VIN = 12V, VOUT = 24V, IOUT = 0.4A (50% duty, 2 MHz), power dissipation is approximately (1 - η) × POUT ≈ 0.48 W assuming 90% efficiency, well within the MSOP-12 EP thermal budget at moderate ambient. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes that go beyond the manufacturer datasheet.
LT8390EFE#PBF - 60V Sync 4-Switch Buck-Boost Controller | ADI
The Analog Devices LT8390EFE#PBF is a synchronous 4-switch buck-boost DC/DC controller that regulates output voltage, input or output current from an input voltage above, below, or equal to the output voltage, housed in a 28-pin TSSOP-EP package. The proprietary peak-buck/peak-boost current mode control scheme allows adjustable and synchronizable 150 kHz to 650 kHz fixed frequency operation, or internal ±15% triangle spread spectrum modulation for EMI mitigation. It operates from a 4 V to 60 V input range and supports outputs up to 60 V at switching frequencies up to 650 kHz. What is a buck-boost DC/DC controller? A buck-boost converter is a switched-mode power supply topology that maintains a regulated output whether the input voltage is above, below, or equal to the output voltage. The "controller" variant drives external MOSFETs rather than integrating them, enabling high-current applications. Buck-boost controllers belong to the broader switching regulator family (SMPS), which sit alongside linear regulators (LDOs) within the power management IC hierarchy. They are essential when battery stacks, automotive transients, or wide industrial rails cross the input/output boundary. Key features include 4 V to 60 V input voltage range, 0 V to 60 V output voltage range, 1.6 A peak gate drive current, ±1.5% reference voltage accuracy, and built-in spread spectrum frequency modulation. The 28-pin TSSOP-EP package includes an exposed thermal pad with a typical theta_JA near 30 C/W for efficient heat extraction in continuous-conduction high-current designs. The device integrates an internal 7.2 V LDO for gate drive supply and supports both input and output current monitoring with a 100 mV full-scale sense threshold. The LT8390EFE#PBF uses Analog Devices' proprietary peak-buck/peak-boost current-mode architecture, which samples the inductor current at the peak of each switching cycle in both buck and boost regions. This eliminates mode-transition transients and supports seamless transitions between buck, buck-boost, and boost regions. The synchronization input accepts an external 150 kHz to 650 kHz clock, while internal spread spectrum reduces peak EMI by up to 15 dB without external components. Typical applications include automotive start-stop systems, USB-PD and industrial battery-powered equipment, solar-powered battery chargers, high-power LED drivers, and regulated 24 V industrial bus converters. The wide 60 V input tolerance makes it especially suited to 12 V/24 V automotive and 48 V mild-hybrid environments with large load-dump transients. When designing with the LT8390EFE#PBF, ensure the CTRL pin is tied above 1.35 V for full-scale current programming, and Kelvin-connect the sense resistor to ISP/ISN pins for accurate current limiting. The exposed pad must be soldered to a continuous ground plane to meet the rated thermal performance. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LT8391IUFD#PBF - 60V Sync 4-Switch Buck-Boost LED Controller | ADI
The Analog Devices LT8391IUFD#PBF is a 60V synchronous 4-switch buck-boost LED controller that regulates constant LED current when the input voltage is above, below, or equal to the output (battery) voltage, packaged in a thermally enhanced 28-lead QFN (4x5 mm) with exposed pad. What is a buck-boost LED controller? A buck-boost LED controller is a switching power supply topology that can step the input voltage either down (buck) or up (boost) while maintaining a tightly regulated constant current to the LED string. In the broader taxonomy it sits under: LED driver -> DC-DC controller -> power management IC -> analog mixed-signal semiconductor. This category is essential for any application where the battery or supply rail crosses the forward voltage of the LED string during operation - such as automotive cold-crank/cranking transients where a 12V lead-acid battery can briefly drop to 3-6V and then recover to 14.4V during load-dump. The LT8391 uses Analog Devices' proprietary peak-buck / peak-boost current-mode control with adjustable and synchronizable switching frequency from 150 kHz to 650 kHz. Key specifications include a 4V to 60V input operating range, internal 5V/12V gate drivers for the four external MOSFETs, ±3% LED current accuracy, and PWM/analog dimming capability. The 4-switch synchronous architecture minimizes power loss compared to diode-based non-synchronous designs and enables high efficiency across the full input range. Architecturally, the controller uses a single inductor with four MOSFETs arranged in an H-bridge buck-boost topology. The proprietary control scheme prevents simultaneous buck and boost switching, eliminating circulating currents and dramatically improving light-load efficiency. The exposed-pad QFN-28 (4x5) package provides low thermal resistance, allowing the controller itself (which typically drives external MOSFETs) to dissipate only modest internal power. Typical applications include automotive LED headlights and daytime running lights where input voltage swings from 4V during cranking to 35V+ during load-dump, battery voltage indicators for fire/security panels, LCD backlight drivers, and general high-brightness LED illumination. The wide input range and single-inductor 4-switch topology eliminate the need for a SEPIC or flyback converter, simplifying BOM and improving efficiency. When designing with the LT8391, choose external MOSFETs rated for the worst-case input voltage (typically 60V or 80V parts for load-dump margin), and select the inductor based on switching frequency and ripple current. Use ADI's LTspice simulation model and reference designs in the datasheet to size the inductor and compensation network. This page synthesizes distributor pricing from DigiKey, Mouser, LCSC and Octopart, plus verified same-family ADI drop-in alternatives and cross-brand equivalents not consolidated on any single distributor page.
LT8490EUKJ - 80V 10A MPPT Buck-Boost Battery Charger | Analog Devices
The Analog Devices LT8490EUKJ is an 80 V input, 10 A buck-boost switching battery-charge controller with maximum power point tracking, packaged in a 64-pin HVQFN. It combines wide input-voltage tolerance, multi-chemistry CCCV charging, high-current capability, and solar MPPT control in one surface-mount device. The verified distributor ordering code is LT8490EUKJ#PBF, while LT8490EUKJ#TRPBF denotes the tape-and-reel ordering option. A buck-boost battery charger is a power-management IC that regulates charging power whether the source voltage is above or below the battery voltage. The LT8490 belongs to the switching-regulator hierarchy and supports sealed lead-acid, flooded, gel, and lithium-ion batteries. Its constant-current constant-voltage, or CCCV, profile transitions from controlled charging current to controlled battery voltage as the pack approaches its final voltage. Key verified characteristics include an 80 V maximum input, charging capability up to 10 A, and maximum power point tracking for photovoltaic systems. The buck-boost topology allows operation when the input-to-battery voltage relationship changes during the day. This is especially useful in solar installations where irradiance, temperature, and module operating point vary throughout the charge cycle. The device integrates the control functions needed to coordinate harvested power and battery charging rather than operating as a simple linear regulator. MPPT helps the charger seek the available solar-array maximum-power point, while CCCV manages battery chemistry and final voltage. Detailed switching frequency, accuracy, quiescent current, protection thresholds, and thermal data require confirmation in the current Analog Devices datasheet. Typical uses include solar-powered remote instrumentation, off-grid battery systems, portable industrial equipment, renewable-energy storage, and backup power installations. These systems benefit from charging when panel voltage may be lower or higher than the battery voltage. High-current capability also supports larger battery banks where wiring, fusing, thermal design, and connector selection require careful engineering. For implementation, verify the exposed-pad land pattern, inductor and MOSFET selection, compensation, current sensing, and thermal paths against the manufacturer datasheet. The MPPT controls and charging settings must be configured for the selected chemistry. Input transients and battery transients need protection appropriate to the installation, especially for long cable runs and outdoor photovoltaic systems. This page combines verified distributor information, manufacturer product facts, design guidance, and honest replacement analysis. It distinguishes confirmed electrical facts from unverified parameters rather than inferring missing values, helping engineers evaluate the LT8490EUKJ for high-voltage, multi-chemistry battery charging before requesting detailed pricing.
LT8491EUKJ - 80V Buck-Boost Battery Charger w/ MPPT | ADI
The Analog Devices (formerly Linear Technology) LT8491EUKJ is a high-voltage buck-boost battery charge controller that operates from input sources up to 80V and delivers up to 10A charge current into lead-acid, LiFePO4, Li-Ion, or Li-Polymer battery stacks. Housed in a 64-lead (7mm x 11mm) plastic QFN package with an exposed thermal pad, the LT8491EUKJ integrates Maximum Power Point Tracking (MPPT) for solar-powered chargers, an I2C programmable interface for telemetry and control, and constant-current/constant-voltage regulation with automatic recharge and trickle-charge states. The onboard LED driver outputs charge-state indication directly from the controller. A buck-boost battery charger is a switching converter topology that maintains power delivery to the battery when the input voltage is either above or below the battery voltage. In the broader product hierarchy, the LT8491EUKJ sits as a battery management IC (sub-category: charger controller) within the power management family. This topology is essential when the source - solar panels, automotive alternators, or stacked battery packs - spans voltages on both sides of the battery terminal. Unlike a pure buck or pure boost charger, the LT8491EUKJ handles transitions through VIN = VBAT without control-mode discontinuities. Key features include a wide 6V to 80V input operating range, up to 10A programmable charge current, ±1% accurate float voltage feedback, integrated MPPT algorithm that periodically perturbs-and-observes the input voltage to track the panel peak-power operating point, and I2C read-back of VIN, IBAT, VBAT, and die temperature. The device also supports programmable charging current, battery temperature monitoring, automatic recharge, and charge-termination. The 64-lead QFN package provides a low thermal resistance path via the exposed paddle, enabling sustained high-current charging without external heatsinking in well-laid-out PCBs. Architecturally, the LT8491EUKJ uses a synchronous four-switch buck-boost stage driven by a current-mode controller, with separate loop compensation nodes for CCM and DCM operation. Internal MOSFET gate drivers are rated for 80V operation and the controller synchronizes to an external clock or internal oscillator. Telemetry is exposed through a 16-bit I2C interface, allowing host microcontrollers to log charge profiles, modulate MPPT thresholds, and implement custom charge algorithms. Typical applications include solar MPPT charge controllers for off-grid lighting and telecom, e-mobility battery chargers (e-bikes, scooters), industrial backup battery systems, automotive 24V/36V battery stack maintenance, and portable medical equipment battery management. When designing with this device, follow the layout guidelines in the LT8491 datasheet - input capacitors, inductor, and the exposed pad must be sized for the thermal dissipation expected at full charge current.
LT8491IUKJ#PBF - 80V Buck-Boost Battery Charger | Analog Devices
The Analog Devices LT8491IUKJ#PBF is a high-voltage buck-boost switching battery charge controller with integrated Maximum Power Point Tracking (MPPT) and an I2C interface, delivering up to 10 A charge current from an input range up to 80 V in a 64-pin QFN-EP (7x11 mm) package. It implements a constant-current constant-voltage (CCCV) profile compatible with sealed lead-acid (SLA), flooded, gel, Li-Ion, Li-Pol and LiFePO4 chemistries, and operates from input voltages above, below or equal to the output battery voltage, allowing it to be powered directly from a solar panel or any DC source between 6 V and 80 V. What is a buck-boost battery charge controller? A buck-boost battery charge controller is a switching regulator that can step the input voltage either up or down to match the required battery charging voltage, regardless of whether the source voltage is above, equal to, or below the battery voltage. It sits in the power management hierarchy below the system power supply and above the battery pack, regulating energy flow with high efficiency to extend runtime, protect cell chemistry and maximize battery life. MPPT versions such as the LT8491 additionally track the peak-power operating point of photovoltaic sources, capturing extra energy from solar panels under varying irradiance. Key features include programmable charge current up to 10 A, on-chip logic that supports float-voltage and recharge threshold programming, and an I2C-compatible serial interface for telemetry and configuration. The exposed-pad QFN-64 package provides a low thermal resistance path that dissipates switching losses across the PCB copper pour. The wide 6 V to 80 V operating range eliminates the need for an upstream pre-regulator in 12 V, 24 V, 36 V or 48 V solar systems. Architecturally, the LT8491 uses four external N-channel MOSFETs in a synchronous H-bridge buck-boost configuration, allowing current to flow in either direction through the inductor. The MPPT algorithm samples input voltage and current to compute instantaneous power and perturbs the operating point to stay at peak power, with a periodic full sweep to handle partial-shading conditions. The integrated I2C block reports battery voltage, charge current, input voltage and fault flags. Typical applications include solar-powered lead-acid chargers for off-grid lighting and telemetry, 12 V/24 V/36 V/48 V industrial battery backup systems, LiFePO4 starter batteries, portable medical carts, and remote monitoring stations. The wide input range is especially valuable for solar charge controllers where panel voltage swings substantially with temperature and light. When designing with the LT8491, select external MOSFETs and the power inductor based on peak inductor current, and lay out the SW1/SW2 loops with minimum area to limit EMI. Use the exposed thermal pad with adequate copper on inner and outer PCB layers to keep junction temperature within ratings at 10 A. Consult the manufacturer datasheet for sense resistor values, compensation network selection and I2C address configuration. This page synthesizes distributor pricing, drop-in alternatives and practical design notes not collected in any single datasheet.
LT8582IDKD#PBF - Dual 3A DC/DC Converter | Analog Devices
The Analog Devices LT8582IDKD#PBF is a dual-channel PWM DC/DC converter with two independent 3 A switch paths, a 2.5 V to 22 V input range, and a 24-pin WFDFN exposed-pad package. Each channel can be configured as a boost, inverting, SEPIC, Cuk, or flyback converter, with a 42 V maximum switch rating and integrated fault protection. A PWM DC/DC converter is a switching regulator that transfers energy between voltage rails using controlled transistor switching, inductors, capacitors, and feedback loops. The LT8582 belongs to the switching-regulator hierarchy within power-management semiconductors, where it offers greater topology flexibility than a fixed-output converter. Its two independent channels can generate separate positive or negative outputs, making it suitable for dual-rail and bipolar systems. Key features include a power-good signal for event-based sequencing, external-clock synchronization, output short-circuit protection, and a high-gain shutdown input that accepts slowly changing signals. Each channel uses a master switch and a slave switch rated to 42 V. The verified distributor data identifies a maximum switch current of 3.3 A and a 3 A per-channel current capability, while the manufacturer describes tied switches for a 3 A total current limit. The LT8582’s configurable topology allows one device to address boost, inverting, SEPIC, Cuk, and flyback requirements. The power-good output supports system-level sequencing, while fault protection helps guard against input overvoltage and overtemperature conditions. The exposed thermal pad improves heat transfer when the package is properly soldered to PCB copper. Typical applications include industrial negative-rail generation, isolated or nonisolated auxiliary supplies, battery-powered systems, LED backlight drivers, and instrumentation requiring dual-polarity outputs. Because switch-node transitions can create EMI, careful layout, inductor selection, capacitor placement, and thermal-path design remain essential. Designers should begin with the manufacturer’s recommended application circuits and verify switching frequency, compensation, current limit, output ripple, and startup behavior for the selected topology. Confirm exposed-pad soldering and thermal performance against the actual PCB stackup before production. This product page consolidates verified Analog Devices and distributor information with engineering-oriented guidance. It distinguishes tube-packaged LT8582IDKD#PBF from the tape-and-reel LT8582IDKD#TRPBF variant and emphasizes replacement verification rather than treating similar package names as automatic compatibility.
LT8606EDC#TRPBF - 42V 350mA Sync Buck Regulator | Analog Devices
The Analog Devices LT8606EDC#TRPBF is a 42V, 350mA synchronous monolithic step-down switching regulator that consumes only 1.7 µA of non-switching quiescent current, housed in an 8-pin 2 mm x 2 mm DFN exposed-pad (LTC DDC) package. It features a wide 3.0 V to 42 V input range and delivers a fixed/adjustable output down to 1.8 V with 90%+ efficiency. What is a synchronous buck regulator? A buck regulator (step-down switching regulator) is a type of DC-DC converter that reduces a higher DC input voltage to a lower regulated DC output voltage. Synchronous means the high-side switch is paired with a low-side MOSFET that replaces the traditional rectifier diode, which substantially improves efficiency at moderate-to-high load currents. The synchronous buck regulator sits within a hierarchy: DC-DC converter -> switching regulator -> buck (step-down) regulator -> power management IC -> semiconductor. These parts are the workhorses of point-of-load (POL) power conversion in nearly every modern electronic system. Key features include low ripple Burst Mode operation for high efficiency at light loads, a 2 MHz default switching frequency (allowing small inductor and capacitor selection), internal top and bottom switches, and a power-good indicator. The DFN-8 (DDC) variant is optimized for ultra-compact layouts and does not expose the SYNC/TR/SS pins available on the MSOP version of the same die. The LT8606 architecture pairs a peak current-mode controller with integrated 42V-tolerant MOSFETs, achieving fast transient response without complex compensation networks. Its 1.7 µA quiescent current is roughly 10x lower than competing 42V synchronous buck converters, making it ideal for battery-powered systems that must remain alive in standby for years. Typical applications include automotive cold-crank / always-on rails, industrial 24V sensor and actuator supplies, battery-powered IoT and metering devices, and portable instrumentation where small PCB footprint and high efficiency at micro-loads matter most. Design consideration: Use a 4.7 µH to 10 µH inductor with >= 0.5 A saturation current, place input/output ceramic capacitors close to the IC, and exploit the exposed pad as a thermal via field. The DFN version of the LT8606 omits the SYNC/TR/SS pins of the MSOP version; if you need external synchronization or soft-start, select the LT8606EMSE#PBF or LT8606HMSE#PBF. This page synthesizes distributor pricing as of 2026-10-08, pin-compatible drop-in alternatives (LT8606 family), and practical thermal/PCB layout notes not found in the manufacturer datasheet alone.
LT8609AIMSE - 42V, 3A Synchronous Buck Regulator | Analog Devices
The Analog Devices LT8609AIMSE is a 42 V, 3 A synchronous step-down switching regulator with 2.5 µA quiescent current, housed in a 10-lead MSOP package with an exposed pad. It provides adjustable output voltage from 0.782 V upward and integrates high-side and low-side power switches. The LT8609A is optimized for compact, efficient point-of-load conversion where low standby consumption, wide input voltage, and high load current are important. A synchronous buck converter is a switching DC-DC regulator category within power management integrated circuits. Its high-side switch charges an inductor during one switching phase, while its low-side synchronous switch provides a discharge path during the other phase. This topology converts a higher input voltage to a lower regulated output with high efficiency. Compared with a linear regulator, the synchronous architecture reduces dissipation when the input-to-output voltage difference is substantial, making it suitable for battery, industrial, communications, and automotive systems. Key verified features include a 42 V maximum input rating, continuous current capability up to 3 A for the LT8609A family, 2.5 µA quiescent current, and Burst Mode operation that maintains output ripple below 10 mVP-P at low output currents. The family also provides frequency synchronization through a SYNC pin, according to the manufacturer product page and datasheet search result. These characteristics allow the regulator to balance efficiency, transient response, and board area. The LT8609AIMSE is an industrial-temperature ordering option in the LT8609 family, identified by the I temperature grade and MSE package designation. The provided distributor listing identifies a 10-MSOP package with exposed pad, approximately 3.00 mm wide. The exposed thermal pad must be connected to ground and used as a heat-spreading feature when operating at sustained high loads. Electrical details such as switching frequency, output-voltage accuracy, control-loop compensation, and absolute maximum ratings beyond the verified values should be confirmed in the current Analog Devices datasheet. Typical applications include telecom and data-communication equipment, industrial control systems, battery-powered equipment, notebook and tablet power rails, and distributed power systems. A 42 V input rating also allows use in industrial buses when transient and surge requirements are properly addressed. The regulator is most useful where a 3 A load capability and low no-load consumption are required without using a larger power package. When designing around the LT8609AIMSE, select the inductor and input/output capacitors according to the datasheet guidance, keep the switching loop layout compact, and provide adequate copper area around the exposed pad. Verify startup behavior, output ripple, load-transient response, and thermal rise at the highest expected input voltage and load. The main trade-off is switching-regulator output ripple compared with a low-noise linear regulator, so sensitive analog loads may still require post-filtering.
LT8609SIV#PBF - 42V 2A/3A Peak Sync Buck Regulator | Analog Devices
The Analog Devices LT8609SIV#PBF is a compact, high-efficiency, high-speed synchronous monolithic step-down switching regulator that consumes only 1.7 µA of non-switching quiescent current, housed in a 16-pin TFQFN exposed-pad package. It delivers 2 A of continuous output current with peak loads up to 3 A for less than 1 second, accepts input voltages from 3.0 V to 42 V, and produces an adjustable output as low as 0.782 V. A buck switching regulator (step-down converter) is a type of DC-DC switching regulator that efficiently converts a higher DC input voltage to a lower DC output voltage using an internal switch, an external inductor, and control loop. Synchronous buck regulators use a MOSFET in place of the traditional freewheeling diode to reduce conduction loss and improve efficiency, especially at high load currents. The LT8609S sits within the power management hierarchy of: switching regulator -> DC-DC converter -> voltage regulator -> power management IC -> semiconductor. Key features include a 1.7 µA quiescent current that makes the part ideal for always-on applications, a wide 3.0 V to 42 V input range that survives automotive load-dump transients, and a programmable output down to 0.782 V for powering modern low-voltage MCUs and SoCs. The part uses a constant-frequency peak current-mode architecture up to 2 MHz, and the SYNC/MODE pin allows synchronization to an external clock. Internal MOSFETs (top + bottom) eliminate the need for an external Schottky diode. The LT8609S uses a peak current-mode control architecture with a precision reference and internal loop compensation, which simplifies schematic design by reducing the external component count to just an inductor, input/output capacitors, and feedback resistors. The 42 V absolute maximum input makes the part attractive for 12 V and 24 V industrial or automotive buses. The exposed pad on the TFQFN-16 package provides a low theta_JA thermal path for sustained 2 A operation. Typical applications include automotive always-on systems, industrial 24 V sensor and actuator rails, battery-powered portable instruments, and general-purpose 5 V/3.3 V/1.8 V point-of-load conversion in telecom and factory automation. The low IQ also makes the part attractive for solar- or battery-energy-harvested systems. When designing with the LT8609S, place the input capacitor as close as possible to the IN and GND pins to minimize switching loop area and EMI. Choose the inductor based on the 1.5 A to 3 A saturation current rating to handle the peak current-mode ripple. Use a feedforward capacitor (CFF) in parallel with the top feedback resistor to improve transient response when VOUT is well above the 0.782 V reference.
LT8614IUDC - 42V 4A Sync Step-Down Silent Switcher | ADI
The Analog Devices LT8614IUDC is a 42V, 4A synchronous step-down Silent Switcher regulator with 2.5 uA quiescent current, housed in a 20-pin 3mm x 4mm QFN package with exposed pad. The IUDC suffix denotes the industrial temperature grade (-40C to +125C operating junction range) and a specific reel-pack orientation. The part accepts input voltages from 3.4V to 42V and delivers an adjustable output from 0.97V to 41.8V at up to 4A continuous output current. A buck (step-down) switching regulator is a DC-DC converter topology that produces a lower regulated output voltage from a higher input voltage by rapidly switching an inductor-capacitor energy-transfer network. The Silent Switcher architecture used here is a proprietary Analog Devices technique combining internal layout, controlled switching-edge rates, and an optional spread-spectrum frequency modulation mode to minimize EMI emissions while preserving high efficiency. Within the broader power management hierarchy, the LT8614IUDC is a member of the monolithic synchronous buck regulator subclass, which sits under the wider category of switched-mode power supply (SMPS) ICs. Key features include a minimum on-time of approximately 30 ns enabling high step-down ratios at high switching frequencies, internal synchronous power switches that eliminate the external Schottky diode, and a Burst Mode operation that drops quiescent current to 2.5 uA at no load for battery-powered applications. A power-good (PG) open-drain output flags output-in-regulation, the SYNC pin accepts an external clock or selects between Burst Mode and pulse-skipping modes, and the TR/SS pin enables soft-start and tracking. The integrated MOSFET design yields peak efficiency above 95% at moderate loads. Typical applications include automotive and industrial 24V/12V bus step-down conversion, point-of-load regulation in distributed power architectures, battery-powered portable equipment that benefits from the 2.5 uA Iq, and noise-sensitive systems that leverage Silent Switcher EMI performance to ease CISPR 25 / FCC Class B compliance. The wide VIN range also supports telecom 48V nominal rails after a front-end protection circuit. When designing with the LT8614IUDC, place input capacitors as close to the PVIN and PGND pins as possible to minimize switching-current loop area; the exposed pad must be soldered to a sufficiently large copper pour for thermal dissipation. At 4A load with a 12V to 3.3V conversion, the IC dissipates roughly 1W; thermal relief is generally adequate from a 1 square inch copper pour. This page synthesizes the verified web datasheet values, drop-in same-package alternatives (including the LT8614HUDC automotive grade), current distributor pricing as of 2026-10-08, and practical design notes not found directly in the manufacturer datasheet, giving engineers a faster procurement and design-decision path.
LT8614IUDC#PBF - 42V 4A Silent Switcher Buck | Analog Devices
The Analog Devices LT8614IUDC#PBF is a 42 V, 4 A synchronous step-down DC-DC converter using Silent Switcher architecture to minimize EMI emissions, with an adjustable output down to 0.97 V and integrated power switches in a 20-lead WFQFN package with exposed pad. It is designed for efficient point-of-load and industrial power conversion where high switching frequency, low quiescent current, and compact layout are important. A synchronous buck converter is a DC-DC regulator that uses integrated high-side and low-side switches to transfer energy efficiently while reducing output voltage from a higher input rail. The LT8614 belongs to the voltage-regulator hierarchy within power-management ICs and uses Analog Devices Silent Switcher architecture to control EMI emissions during high-frequency operation. Its monolithic construction helps reduce external component count and supports compact converter layouts. The verified product data identifies operation from 3.4 V to 42 V input, 0.97 V to 41.8 V adjustable output, and up to 4 A output current. Efficiency reaches 96% at 1 MHz and 94% at 2 MHz according to the verified distributor data. Burst Mode operation provides 2.5 µA quiescent current for 12 VIN to 3 V regulation in the cited operating condition, making the device suitable for low-power and battery-influenced systems when the converter is not carrying heavy load. The SYNC pin supports clock synchronization and selection of Burst Mode or pulse-skipping operation, while TR/SS provides soft-start and tracking functions. These features help control inrush current and coordinate multiple rails in systems where sequencing or load sharing matters. The exposed-pad QFN package supports improved heat transfer when the PCB provides adequate copper area. Typical uses include industrial 24 V or 36 V rail conversion, telecom and networking equipment, robotics, instrumentation, and compact embedded systems. Its wide input range covers automotive-style transient headroom when designed with appropriate upstream protection, but the verified data does not establish AEC-Q100 qualification for this exact suffix. For implementation, check the complete datasheet pinout, compensation or voltage-setting details, switch-current limits, and thermal limits against the exact LT8614IUDC#PBF ordering code. Place input and output capacitors close to their corresponding pins, provide a continuous ground path, and use the exposed pad as a thermal interface rather than an isolated copper island.
LT8620EMSE - 65V, 2A Sync Buck Regulator, 2.5uA IQ | ADI
The Analog Devices LT8620EMSE is a 65V, 2A synchronous monolithic step-down switching regulator housed in a 16-pin MSOP package with exposed pad (MSE). It accepts a wide input voltage range of 3.4V to 65V and consumes only 2.5 uA of quiescent current, making it well-suited for always-on and battery-powered applications. The output is adjustable from 0.97V to 64.75V via an external resistor divider. A buck (step-down) switching regulator is a type of DC-DC converter that produces a lower regulated output voltage from a higher unregulated input voltage. Buck regulators sit in the power management IC (PMIC) hierarchy beneath linear regulators, LDOs, and switching converters. They are the dominant topology for point-of-load (PoL) conversion in industrial, automotive, and telecom systems because they achieve much higher efficiency than linear regulators by rapidly switching an inductor between the input and ground. Key features include integrated top and bottom power switches, low-ripple Burst Mode operation that maintains high efficiency at light loads, internal compensation, and an exposed thermal pad for low thermal resistance. The device operates at a typical switching frequency around 2.2 MHz with the internal oscillator. According to the Analog Devices LT8620 datasheet (8620fa), the part supports synchronization to an external clock across the operating range. The LT8620 uses a current-mode control architecture with an integrated high-side and low-side MOSFET pair, eliminating the need for an external Schottky diode in most applications. This monolithic integration reduces BOM count, PCB area, and EMI compared to controller-plus-discrete-FET designs. The wide 3.4V to 65V input range handles transient spikes on 12V, 24V, and 48V rails, including load-dump events in automotive systems. Typical applications include 4-20 mA loop-powered industrial sensors, automotive ECU and infotainment supplies, 48V telecom point-of-load conversion, battery-powered equipment, and distributed supply rails in factory automation. Its 2.5 uA quiescent current also makes it a strong candidate for always-on housekeeping rails in energy-harvesting or solar-powered nodes. When designing with this part, evaluate the trade-off between efficiency and EMI: Burst Mode operation maximizes light-load efficiency but produces lower-frequency output ripple; pulse-skipping or forced-continuous modes trade some efficiency for predictable spectrum. The exposed pad must be soldered to a sufficient copper pour to meet thermal ratings at 2A continuous load. This page synthesizes distributor pricing, same-family and cross-brand drop-in alternatives in the same MSOP-16 EP package, and practical design notes not found in the manufacturer datasheet alone.
LT8640EUDC#TRPBF - 42V 5A Sync Buck Silent Switcher | ADI
The Analog Devices LT8640EUDC#TRPBF is a 42 V, 5 A synchronous step-down Silent Switcher regulator housed in a 20-lead (18-pin) LQFN/WFQFN exposed-pad package. It accepts an input range of 3.4 V to 42 V and delivers an adjustable output from 0.97 V up to 41.58 V at up to 5 A continuous load current, with switching frequencies programmable up to 3 MHz. A buck switching regulator (also called a step-down DC-DC converter) is a power management IC that converts a higher DC input voltage to a lower DC output voltage with high efficiency by rapidly switching an internal power MOSFET and filtering the resulting pulsed waveform through an LC network. Buck regulators sit within the broader power management IC category and are the dominant topology for point-of-load regulation on distributed power rails. Key differentiating specifications of the LT8640EUDC#TRPBF include the proprietary Silent Switcher architecture that minimizes EMI emissions to meet stringent automotive and industrial radiated-noise limits, an ultralow 2.5 µA quiescent current that keeps the output in full regulation at no load (critical for always-on battery applications), and a fast 30 ns minimum top-switch on-time that enables high VIN-to-low-VOUT conversion at high frequency. The SYNC/MODE pin selects between Burst Mode operation, spread-spectrum mode, external clock synchronization, and pulse-skipping/forced-continuous modes. Internally the LT8640EUDC#TRPBF uses synchronous rectification with internal top and bottom power switches, eliminating the need for an external Schottky diode. The device integrates loop compensation, an internal reference, and precision enable/UVLO functions, shrinking the external BOM to input/output capacitors plus an inductor and feedback divider. Typical applications include automotive always-on systems, industrial 24 V/36 V bus point-of-load rails, battery-powered portable equipment, and any noise-sensitive environment where CISPR 25 radiated EMI compliance is required. Designers value the 2.5 µA Iq for quiescent-sensitive designs. When designing with this regulator, choose an inductor sized for the switching frequency and ripple current, place input ceramic capacitors within 1-2 mm of the VIN and GND pins, and ensure the exposed pad has adequate copper area for thermal dissipation since 5 A load at high VIN generates substantial heat. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical PCB/layout design notes not consolidated in any single manufacturer document.
LT8640IUDC-1 - 42V, 5A Sync Buck Silent Switcher | Analog Devices
The Analog Devices (formerly Linear Technology) LT8640IUDC-1 is a 42V input-capable, 5A synchronous step-down Silent Switcher regulator housed in a 20-lead (18-pin exposed pad) 4mm x 3mm QFN plastic package, operating over the -40C to +125C industrial junction-temperature range. It features a wide 3.4V to 42V input range, 0.97V to 41.58V adjustable output, 200kHz to 3MHz programmable switching frequency, and 2.5µA quiescent current with the output in full regulation at light loads. An LDO (low-dropout linear regulator) and buck (step-down) DC-DC converter are two distinct topologies in the power-management IC family tree. Both belong to the broader category of voltage regulators, but an LDO uses a series pass element to dissipate VIN-VOUT as heat, while a buck converter switches an inductor to deliver power with much higher efficiency. The LT8640IUDC-1 is a monolithic synchronous buck converter that integrates the high-side and low-side MOSFETs, eliminating the external Schottky diode typical of older buck designs and reducing BOM count. Key features of the LT8640IUDC-1 include Analog Devices' Silent Switcher architecture, which minimizes EMI emissions by containing the high-dV/dt switching node loops, enabling compliance with CISPR 224 likely-class radiated and conducted limits without a shield. It delivers 5A continuous output at high efficiency, has a 30ns minimum on-time that allows high-frequency step-down at high VIN to low VOUT, and offers Burst Mode operation, spread-spectrum modulation, and external clock synchronization through the SYNC/MODE pin. The -1 suffix designates forced-continuous operation, in contrast to the standard LT8640 which uses pulse-skipping at light loads. The LT8640IUDC-1 is particularly well-suited to automotive and industrial applications where the input rail can see load-dump transients up to 42V and where EMI compliance is critical. Typical use cases include 24V industrial sensor rails, automotive infotainment, point-of-load supplies downstream of a 12V or 24V bus, and battery-powered systems where 2.5µA quiescent current dramatically extends standby life. A 10µF minimum output capacitor with low ESR is required to keep the control loop stable. When designing with this part, ensure the input capacitor is ceramic and placed close to the VIN and PGND pads, and that the exposed pad is soldered to a sufficiently large copper pour for thermal dissipation - at 5A load with large VIN-VOUT, the LT8640IUDC-1 can dissipate several watts. This page synthesizes distributor pricing, drop-in alternatives including the AEC-Q100 automotive-grade variant and the 3.5A 65V LT8641, and practical design notes not found in the manufacturer datasheet.
LT8640IUDC-1#PBF - 42V, 5A Sync Silent Switcher Buck | ADI
The Analog Devices LT8640IUDC-1#PBF is a 42V, 5A synchronous step-down Silent Switcher regulator with adjustable output from 0.97V to 41.58V, housed in a 20-WFQFN exposed-pad package (18 leads, 3mm x 4mm). It supports a wide 3.4V to 42V input range, switches up to 3 MHz, and delivers 5A continuous output current with a 30 ns minimum top switch on-time for high-VIN-to-low-VOUT conversion. The Silent Switcher architecture minimizes EMI/EMC emissions while maintaining high efficiency across the load range. A buck switching regulator (step-down DC-DC converter) is a type of switched-mode power supply that converts a higher DC input voltage to a lower DC output voltage using an internal MOSFET switch, inductor, and capacitor energy-storage network. Within the power management IC hierarchy, buck regulators sit alongside LDOs and boost converters as the primary means of efficient point-of-load voltage conversion in systems ranging from automotive 12 V/24 V buses to industrial 24 V backplanes. Key features include forced continuous PWM operation at light load (LT8640-1 variant), selectable Burst Mode, spread-spectrum mode, and external SYNC capability through the SYNC/MODE pin. The 30 ns minimum on-time enables large step-down ratios at high frequency, and quiescent current is rated at 2.5 uA in Burst Mode operation. The device uses monolithic synchronous MOSFETs and current-mode control, with internal compensation and a thermally enhanced QFN exposed pad for 5A delivery. According to the manufacturer datasheet, the LT8640-1 variant differs from the standard LT8640 by using forced continuous PWM at light loads instead of pulse-skipping, making it preferable where low noise and predictable switching frequency are required. Typical applications include automotive 12 V/24 V point-of-load regulation, industrial 24 V sensor and motor-control rails, telecom 48V stepping to logic rails, and battery-powered systems requiring wide VIN range. The Silent Switcher topology suits noise-sensitive environments adjacent to RF or analog circuits. Design tip: keep the input capacitor loop and the two internal hot loops (top FET and bottom FET) symmetrical and as compact as possible; the Silent Switcher architecture relies on this symmetry to cancel magnetic field emissions. This page synthesizes distributor pricing, same-brand drop-in alternatives, and practical EMI/layout design notes not collected in a single place in the manufacturer datasheet.
LT8640SEV#PBF - 42V 6A Silent Switcher 2 Buck Regulator | ADI
The Analog Devices (formerly Linear Technology) LT8640SEV#PBF is a 42 V, 6 A synchronous step-down Silent Switcher 2 regulator housed in a 24-lead LQFN package with exposed pad. The device accepts an input voltage range of 3.4 V to 42 V and delivers an adjustable output from 0.97 V to 10 V at up to 6 A continuous load current, with internal synchronous switches and a typical quiescent current of 2.5 uA in Burst Mode operation. An LDO (Low-Dropout) linear regulator maintains a stable output even when VIN approaches VOUT; a switching buck regulator like the LT8640SEV instead steps a higher DC input voltage down to a lower DC output with much higher efficiency by rapidly toggling an internal MOSFET and storing energy in an external inductor. Within the broader power-management hierarchy, the buck converter sits alongside the boost, buck-boost, and LDO families, all of which fall under the parent category of DC-DC voltage regulators and, more generally, power management ICs. Key features include ADI's Silent Switcher 2 architecture which minimizes EMI by integrating the switching loop capacitors and using a quiet supply, plus a 30 ns minimum top switch on-time enabling high VIN-to-low VOUT conversion at high frequency. The 24-pin 4 mm x 4 mm LQFN exposed-pad package achieves a thermal resistance of approximately 23 C/W on a properly designed 4-layer PCB, supporting full 6 A operation without an external heatsink at moderate VIN-VOUT deltas. Additional capabilities include external clock synchronization via SYNC/MODE pin, spread-spectrum frequency modulation, internal compensation, and an operating junction temperature range of -40 C to +125 C (E-grade). Architecturally, the LT8640SEV combines peak current-mode control with internal top and bottom MOSFET switches rated to handle 42 V transients, eliminating the need for an external Schottky diode in most applications. The Silent Switcher 2 topology integrates the bypass capacitors on-die to minimize the high-frequency switching loop area, dramatically reducing radiated EMI versus conventional buck regulators and simplifying PCB layout for CISPR 25 Class 5 compliance. Typical applications include automotive infotainment and ADAS sensor power rails, industrial 24 V bus point-of-load conversion, portable instrumentation, and any noise-sensitive system that requires high-current, high-efficiency step-down conversion with low EMI. Compared to a conventional buck regulator at the same current, the LT8640SEV achieves 95%+ peak efficiency and emits roughly 25 dB less radiated noise. When designing with this part, prioritize a small, symmetric input capacitor loop placed adjacent to the VIN and PGND pins on the exposed pad, and use a 4-layer PCB with the inner layer as a continuous ground plane to dissipate 6 A at 12 V to 3.3 V without thermal throttling. Choose the inductor per ADI's design tools to balance ripple, efficiency, and transient response. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes drawn from the LT8640S family datasheet, evaluation kit documentation, and reference designs - information not assembled on any single manufacturer or distributor page.
LT8640SEV-2#PBF - 42V, 6A Synchronous Step-Down Silent Switcher | ADI
The Analog Devices LT8640SEV-2#PBF is a 42 V, 6 A synchronous step-down Silent Switcher 2 regulator housed in a 24-lead LQFN (4 mm x 6 mm) exposed-pad package. The -2 variant is optimized for ultra-low EMI/EMC emissions through Analog Devices' second-generation Silent Switcher architecture, while delivering up to 6 A of continuous output current from a 3.4 V to 42 V input rail with adjustable output from 0.97 V to 41.58 V. What is a Silent Switcher buck regulator? A synchronous buck converter is a switch-mode DC-DC topology that steps down a higher input voltage to a lower regulated output using a pair of MOSFET switches and an LC output filter; it replaces a traditional buck diode with a synchronous MOSFET to reduce conduction loss. The Silent Switcher 2 architecture further minimizes EMI by splitting the input hot loop into symmetrical parallel paths, enabling the LT8640SEV-2 to meet CISPR 25 / CISPR 32 Class 5 radiated and conducted EMI limits with minimal filtering, which is essential for noise-sensitive automotive and industrial designs. Key specifications include a 30 ns minimum on-time that supports high step-down ratios even at 2 MHz switching frequency, 96% peak efficiency, 2.5 uA quiescent current in Burst Mode operation, and 200 kHz to 3 MHz programmable switching frequency. The device supports spread-spectrum frequency modulation, external clock synchronization, pulse-skipping, and forced continuous modes through the SYNC/MODE pin, and includes internal loop compensation to simplify PCB design. The 24-LQFN exposed pad provides low thermal resistance for sustained 6 A operation. The peak current-mode control architecture with 30 ns minimum top switch on-time enables high VIN-to-low-VOUT conversion at high switching frequencies (e.g., 24 V to 1.0 V at 2 MHz). Internal MOSFETs are optimized for both high efficiency and thermal performance, supporting up to 6 A continuous load with no external heatsink required when VIN-VOUT differential is moderate. Typical applications include automotive infotainment and ADAS power rails, industrial 24 V bus to point-of-load conversion, battery-powered systems (12 V / 24 V / 36 V Li-ion stacks), GPS / telematics modules, and low-EMI communications infrastructure. The 2.5 uA quiescent current also makes it suitable for always-on bias supplies. Design trade-off: the -2 variant is specified for tighter EMI compliance but is otherwise equivalent to the LT8640SEV; the standard -1 (LT8640S/LT8640SA) and non-EMI -2 variants coexist on the same datasheet for design flexibility. Always place input ceramics directly at the VIN and PGND pins to maximize the benefit of Silent Switcher 2. This page synthesizes distributor pricing, verified drop-in alternatives from the LT8640S / LT8643S-2 family, and practical design notes not duplicated in the manufacturer datasheet, providing an engineer-ready decision matrix for selecting the right synchronous buck for low-EMI applications.
LT8640SIV#PBF - 42V, 6A Silent Switcher 2 Buck | Analog Devices
The Analog Devices LT8640SIV#PBF is a 42V, 6A synchronous step-down Silent Switcher 2 regulator that minimizes EMI emissions while delivering high efficiency at high switching frequencies, housed in a 24-pin LQFN (LGA-style) exposed-pad package. It features a wide 3.4V to 42V input range, an adjustable output from 0.97V to 10V (up to 41.58V max), and an industry-leading 2.5 µA quiescent current that makes it ideal for always-on applications. The second-generation Silent Switcher architecture integrates internal bypass capacitors and optimized current loops, achieving advertised EMI performance with simplified PCB layout. A buck (step-down) switching regulator is a type of DC-DC converter that uses an energy-storage inductor and synchronous MOSFET switches to convert a higher input voltage into a lower regulated output voltage with high efficiency. Within the broader power management hierarchy, the LT8640SIV#PBF belongs to the family of synchronous step-down regulators, which sit above simple linear regulators and below multi-phase point-of-load converters. The Silent Switcher architecture in particular addresses EMI - a chronic challenge for switching regulators - by tightly controlling the high-di/dt current loops that normally radiate noise, eliminating the need for complex shielding or filtering in many designs. Key specifications include 6A continuous output current, 95% peak efficiency, and a maximum switching frequency up to 3 MHz when configured for low-noise operation. The exposed thermal pad (LQFN-24 with EP) provides low thermal resistance for sustained high-current delivery without external heatsinking. Additional features include internal compensation, internal bootstrap, power-good flag, external synchronization input, and spread-spectrum frequency modulation for further EMI reduction. The output voltage is set by a single external resistor divider. Typical applications span automotive always-on systems, industrial 24V bus converters, portable instrumentation, battery-powered equipment, and noise-sensitive analog/mixed-signal rails. The ultra-low 2.5 µA quiescent current is particularly valuable in automotive cold-crank and e-call systems where the battery must power standby loads for weeks without recharge. The wide 42V input withstands load-dump transients common in 12V and 24V automotive environments, while the 3 MHz switching capability supports single-chip small-form-factor designs without am radio band interference. When designing with the LT8640SIV#PBF, place input capacitors as close as possible to the VIN and PGND pins to minimize the high-frequency current-loop area; this preserves the Silent Switcher 2 EMI advantage. Use a minimum of 4.7 µF X7R ceramic input capacitance and a 22 µF or larger output capacitor for stable operation across the full load range. This page synthesizes distributor pricing, same-family ADI drop-in alternatives (including the -2 spread-spectrum variant and the automotive-grade H-speed grade), and practical design notes that go beyond the manufacturer datasheet.
LT8645SEV#PBF - 65V 8A Silent Switcher Buck Regulator | Analog Devices
The Analog Devices LT8645SEV#PBF is a 65 V, 8 A synchronous step-down (buck) regulator that uses Analog Devices' second-generation Silent Switcher architecture to minimize EMI/EMC emissions while delivering high efficiency at high switching frequencies. The device accepts a 3.4 V to 65 V input range, provides an adjustable output from 0.97 V to 25 V, and is housed in a 32-lead LQFN (LQFN-32) package with an exposed pad. A buck (step-down) DC-DC switching regulator converts a higher DC input voltage to a lower DC output voltage by rapidly switching an internal power MOSFET pair and smoothing the resulting chopped waveform with an LC output filter. The LT8645SEV belongs to the broader category hierarchy of synchronous buck regulator -> step-down converter -> DC-DC converter -> power management IC -> semiconductor. The Silent Switcher architecture in this part integrates internal bypass capacitors and uses optimized internal layout to minimize hot-loop parasitic inductance, dramatically reducing EMI compared to conventional buck converters. Key features include 8 A continuous output current, a peak efficiency greater than 95%, ultra-low quiescent current suitable for battery-powered applications, and internal top and bottom N-channel MOSFET switches. The regulator supports 200 kHz to 2.2 MHz switching frequency operation, allowing trade-offs between efficiency and external component size. The exposed pad package provides a low thermal resistance path, critical for high-current operation. Typical applications include automotive always-on systems, industrial 48 V bus point-of-load conversion, distributed power systems, and battery-powered portable equipment where low EMI is required. The wide input voltage range supports harsh automotive cold-crank and load-dump transients. When designing with this device, follow the datasheet reference layout exactly to preserve Silent Switcher performance. Use low-ESR ceramic input and output capacitors placed close to the IC, and route the BST and INTVCC capacitors with short, wide traces. The exposed pad must be soldered to a sufficiently large copper area for thermal dissipation. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LT8645SEV-2 - 65V, 8A Synchronous Silent Switcher Buck | ADI
The Analog Devices LT8645SEV-2#PBF is a 65V, 8A synchronous step-down Silent Switcher regulator with 2.5 µA quiescent current, housed in a 32-lead LQFN/TFQFN exposed-pad package. It accepts 3.4V to 65V input, delivers an adjustable output from 0.97V up to near-VIN, and uses second-generation Silent Switcher architecture to minimize EMI/EMC emissions while maintaining high efficiency at high switching frequencies. What is a synchronous buck (step-down) regulator? It is a switching DC-DC converter that uses both a high-side and a low-side MOSFET (often integrated) to chop the input voltage and average it through an LC filter, producing a lower regulated output rail with much higher efficiency than a linear regulator. Synchronous buck ICs sit inside the broader power-management IC family, alongside LDOs, boost converters, and charge-pump ICs. The "Silent Switcher" architecture adds careful internal layout, optional internal bypass capacitors, and spread-spectrum frequency modulation to suppress switching noise that would otherwise couple into adjacent analog or RF blocks. Key features include 8A continuous output current, 2.5 µA quiescent current for always-on battery applications, >92% peak efficiency at 12V/5V, integrated 65V internal switches, internal bypass capacitors that reduce EMI, fast minimum on-time of approximately 30 ns for high step-down ratios, and a PGOOD flag, synchronization input, and thermal shutdown. The exposed pad of the 32-TFQFN package gives θJA in the low-30s °C/W range when soldered to adequate PCB copper. Technically, the LT8645SEV-2 uses current-mode control with internal compensation, supports pulse-skipping and Burst Mode operation for light loads, and includes programmable switching frequency from roughly 200 kHz to 2.2 MHz. The 2.5 µA quiescent current is measured when the output is regulated but unloaded - suitable for automotive battery-direct systems that must stay alive in sleep mode. Typical applications include automotive always-on systems, industrial 24V/48V bus rails, telecom point-of-load rails, battery-powered portable instruments, and any noise-sensitive system that previously required a bulky EMI input filter ahead of the switching regulator. For high-frequency operation with low EMI, use the internal bypass option and follow the layout reference in the datasheet. When designing, prioritize a small loop area for the input capacitors and the IC ground return, and provide at least 1 square inch of copper under the exposed pad to manage 8A continuous dissipation. If your design requires higher VIN (>65V) or dual-output capability, look at the LT8646S; if you need 10A, the LT8645S family tops out at 8A on this part number.
LT8645SHV-2#PBF - 65V 8A Silent Switcher Buck | Analog Devices
The Analog Devices LT8645SHV-2#PBF is a 65V, 8A synchronous step-down Silent Switcher regulator with integrated bypass capacitors, housed in a 32-pin LQFN exposed-pad package. It accepts an input range of 3.4V to 65V and delivers an adjustable output from 0.97V to 65V at up to 8A continuous load current, with internal top and bottom power switches. A switching regulator (buck converter) is a type of DC-DC converter that steps a higher DC input voltage down to a lower DC output voltage by rapidly switching an inductor and using energy-storage elements. Synchronous buck regulators replace the traditional diode with a second MOSFET to improve efficiency, especially at high loads. Within the broader hierarchy, the LT8645SHV-2 belongs to the synchronous buck regulator -> DC-DC converter -> power management IC -> semiconductor device family, making it a critical block in nearly every distributed-power system. Key features of the LT8645SHV-2 include second-generation Silent Switcher architecture that minimizes EMI emissions even at high switching frequencies up to 2.2 MHz, internal bypass capacitors to reduce design complexity, 2.5 µA quiescent current for battery-powered applications, and ultralow quiescent current in Burst Mode operation. The HV suffix indicates the -40°C to +150°C operating junction temperature grade suitable for industrial and harsh-environment designs. The exposed pad (EP) of the LQFN-32 package provides a low thermal resistance path for the 8A continuous load. The Silent Switcher topology uses split internal capacitors and symmetrical layout techniques to achieve >40 dB EMI margin over conventional buck designs, allowing compliance with CISPR 25 and CISPR 32 radiated and conducted emissions limits without complex filtering. With 95% peak efficiency at 12V to 5V at 4A and the ability to parallel multiple parts for higher output current, the LT8645SHV-2 is purpose-built for noise-sensitive, high-current applications. Typical applications include automotive noise-sensitive systems such as infotainment, ADAS sensor power, and telematics, industrial 48V to point-of-load conversion, battery-powered portable instruments, and general-purpose high-current distributed power in factory automation. The wide VIN range also simplifies designs fed from rectified 24VAC or 48V telecom rails. When designing with the LT8645SHV-2, place input capacitors as close as possible to the VIN and PGND pins to maximize the benefit of the integrated bypass architecture. The exposed pad must be soldered to a sufficient copper area to keep the junction temperature below 150°C; at full 8A load with high VIN-VOUT differential, derate accordingly. This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design guidance not found in the manufacturer datasheet alone, optimized for engineers evaluating the LT8645SHV-2#PBF for high-current, low-EMI power designs.
LT8645SIV#PBF - 65V 8A Silent Switcher 2 Buck | Analog Devices
Analog Devices LT8645SIV#PBF is an adjustable 65V, 8A synchronous step-down regulator using second-generation Silent Switcher 2 architecture, with a minimum output of 0.97V and a 32-lead TQFN exposed-pad package. It combines integrated bypass capability with high-frequency switching to reduce electromagnetic interference while maintaining efficiency. According to the Analog Devices LT8645S/LT8646S product page, the family is designed for demanding industrial, automotive, and communications power rails where both EMI control and output-current capability are important. A synchronous buck converter is a DC-DC voltage regulator that uses high-side and low-side switching transistors to transfer energy from an input rail to a lower output rail through an inductor. The LT8645S belongs to the power-management hierarchy: DC-DC converter, synchronous buck regulator, switching regulator, and semiconductor. Its Silent Switcher 2 architecture integrates features intended to suppress switching-node energy and radiated emissions while supporting operation at high switching frequencies. The LT8645S delivers up to 8A of continuous output current, accepts a broad input range reported by distributors as 3.4V to 65V, and provides an adjustable output beginning at 0.97V. Newark identifies the adjustable output capability and 3.4V-to-65V input range, while DigiKey describes the device as a positive, single-output, 8A synchronous buck regulator. These values make it suitable for reducing higher-voltage buses to lower rails for processors, communications equipment, sensors, and industrial control electronics. The family is specifically engineered to minimize EMI emissions without sacrificing high-frequency operation. Distributed bypass-capacitor integration can simplify high-current layout and improve switching-node behavior compared with conventional layouts that rely entirely on external input bypass arrangements. The result is useful when the power supply must operate beside sensitive analog, RF, measurement, or communications circuitry while maintaining a compact 32-lead TQFN footprint. Typical applications include 48V industrial power distribution, automotive and transportation power systems, GSM and communications infrastructure, and high-current embedded computing. The wide input range allows the regulator to sit directly behind a protected higher-voltage bus, while the adjustable output supports multiple point-of-load rails when paired with appropriate external components. Designers should follow the manufacturer datasheet for the exact pinout, compensation settings, exposed-pad layout, switching-frequency selection, and recommended capacitor and inductor values. Thermal design is especially important at 8A because regulator efficiency and voltage conversion ratio determine dissipation even though the package provides an exposed pad for board-level heat spreading. This page combines verified distributor specifications, package details, sourcing information, application guidance, and engineering design notes. It highlights the LT8645S as a high-current, low-EMI, wide-input buck regulator while avoiding unverified details that should be confirmed against the current Analog Devices datasheet before layout or production release.