Power Management
Subcategories
Products (2,800+)
LT3045HMSE#TRPBF - 20V 500mA Ultra-Low-Noise LDO | Analog Devices
The Analog Devices LT3045HMSE#TRPBF is a positive adjustable, low-dropout linear regulator rated for 500mA output current, a 20V input range, and ultralow-noise, ultrahigh-PSRR operation in a 12-MSOP exposed-pad package. It is designed for noise-sensitive analog, RF, instrumentation, and precision power-supply applications where a switching regulator is undesirable. A low-dropout regulator, or LDO, is a linear voltage regulator that maintains a stable output while operating with relatively little voltage difference between input and output. The LDO category belongs to the broader voltage-regulator and power-management-IC hierarchy. Unlike a switching converter, an LDO does not add switching-frequency magnetic or conduction noise to the signal path, although power dissipation rises as the difference between input and output voltage times load current increases. The LT3045 uses Linear Technology’s precision current-reference and high-performance voltage-buffer architecture. According to the Analog Devices product page, it combines ultralow output noise with ultrahigh power-supply rejection ratio. The adjustable output supports flexible laboratory and industrial rail generation, while the 500mA current capability covers moderate analog loads. The exposed thermal pad improves heat transfer from the 12-MSOP-EP package when higher dissipation is unavoidable. The LT3045 is especially useful when a noisy upstream switching converter already supplies the raw power but a downstream circuit requires a substantially cleaner rail. Its low-noise behavior makes it appropriate for RF and analog front ends, low-level measurement systems, audio and instrumentation circuitry, and reference or bias networks. The 20V input rating also permits operation above conventional low-voltage rails when regulator headroom is available. Because this device is a linear regulator, designers must verify input-to-output headroom at the maximum expected load. At VIN = 20V and VOUT = 5V, a 500mA load produces an estimated 7.5W dissipation before considering margin; use the exposed pad, adequate copper, and thermal analysis. Input and output capacitors should follow the manufacturer’s recommended network and be placed close to their pins. This page consolidates the verified distributor identity, availability and pricing data, package information, technical use cases, and practical thermal guidance. It is intended to help engineers identify the correct LT3045 ordering code and determine whether its low-noise architecture suits a specific power rail without adding unverified competitor specifications.
LT3045HMSE#Z-EP - 500mA 20V Ultra-Low Noise LDO | ADI
The Analog Devices LT3045HMSE#Z-EP is a 500 mA, 20 V input ultra-low-noise, ultra-high-PSRR LDO linear regulator housed in a 12-lead thermally-enhanced MSOP-EP (MSE) package, qualified to the Enhanced Product (EP) standard for defense and aerospace AQEC applications. It delivers an adjustable output from 0 V to 15 V with a typical dropout of 260 mV at full load. An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is very close to the output voltage. Within the broader system hierarchy, the LT3045HMSE#Z-EP sits as LDO -> linear regulator -> voltage regulator -> power management IC -> semiconductor. Unlike switching regulators, LDOs trade efficiency for the absence of switching ripple, making them the preferred post-regulator for noise-sensitive analog blocks. Key features include 0.8 uVrms output noise (10 Hz to 100 kHz), 75 dB PSRR at 1 MHz, and 2.2 mA quiescent current. The part also integrates reverse-battery protection, reverse-current protection, internal current limit with foldback, and thermal limit with hysteresis. The exposed pad MSOP-12 keeps theta_JA low for reliable operation at elevated ambient temperatures in ruggedized environments. Architecturally, the LT3045 uses a precision current-source reference followed by a high-gain unity-gain output stage, producing noise performance that is essentially independent of output voltage and load current. Its wideband PSRR allows the part to clean up switching-converter residuals in multi-rail systems, eliminating the need for additional LC filters. Typical applications include RF and microwave power rails, military/aerospace avionics, precision data-converter power supplies, and post-regulation for switching converters. The 0 V minimum output enables biasing of negative-rail op-amps or biased negative references when combined with an external charge pump. When designing with the LT3045HMSE#Z-EP, ensure the exposed pad is soldered to at least 1 sq-in of copper to keep junction temperature in range, and place the 10 uF minimum ceramic output capacitor directly at the OUT pins. The -EP suffix designates Enhanced Product flow for AQEC and defense applications; for industrial/consumer designs, use the standard LT3045HMSE#PBF part number. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
LT3080ET - 1.1A Adjustable Single-Resistor LDO Regulator | Analog Devices
The Analog Devices LT3080ET is a 1.1 A adjustable low-dropout (LDO) linear regulator with an output voltage range of 0 V to 36 V, housed in a 5-pin TO-220 (T) through-hole power package with tab. It uses a single external resistor to set the output, eliminating the need for external trace resistors and enabling direct paralleling of multiple devices for higher current or better heat spreading on a board. An LDO (low-dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only marginally higher than the output. LDOs belong to the linear regulator family, which sits under the broader power management IC category and is one of the two dominant approaches to DC voltage regulation (the other being switching converters). Compared with switching regulators, LDOs add no high-frequency switching noise to the output, making them ideal for noise-sensitive analog and RF rails, at the cost of lower efficiency when VIN - VOUT is large. Key features of the LT3080ET include a wide 1.3 V to 36 V input operating range (with the published maximum at 36 V), 1.2 V typical dropout at 1.1 A, an internal current source architecture that supports output down to 0 V, and a Kelvin-programmable output that is independent of PCB trace resistance. The 5-pin TO-220-5 package exposes the die tab for a low thermal resistance of about 30 C/W when properly heatsunk, allowing the part to dissipate several watts in continuous operation. The LT3080 uses a precision current-source reference and a unity-gain voltage follower topology, so the output is set by the value of a single resistor from the SET pin to ground. This architecture permits multiple LT3080 chips to be paralleled directly without ballast resistors or PCB-trim components, simplifying multi-ampere high-current designs and allowing thermal spreading on thermally limited surface-mount boards. The internal protection includes current limiting, safe operating area foldback, and thermal shutdown. Typical applications include adjustable point-of-load (POL) regulators after a switching pre-regulator, high-current tracking power for op-amps and references, USB and industrial 24 V bus rails, and bench lab supplies where a single wide-range LDO replaces several discrete regulators. When designing, place a high-quality 10 uF (minimum) low-ESR output capacitor as close as possible to the OUT pin and select the SET resistor (typically 1 kohm to 200 kohm) using the formula VOUT = 10 uA x RSET, where the 10 uA is the internal SET pin current. Use Kelvin sense at the load when precise regulation under load is required. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not present in the manufacturer datasheet.
LT3090IMSE - -36V, 600mA Negative LDO Regulator | Analog Devices
The Analog Devices LT3090IMSE is a -36V, 600 mA low-dropout (LDO) negative linear regulator with programmable current limit, housed in a 12-pin MSOP-EP package with an exposed thermal pad. It uses a precision 200 µA current reference followed by a rail-to-rail voltage buffer to deliver an adjustable output voltage from 0 V to -32 V, set by a single external resistor. Key electrical features include 600 mA continuous output current, low dropout operation, and paralleling capability for higher load current or thermal spreading. A Low-Dropout (LDO) linear regulator is a type of voltage regulator that maintains a stable output voltage with a very small input-to-output voltage differential, making it essential in power management IC hierarchies. LDOs belong to the broader linear regulator family, which in turn sits inside voltage regulators and the overall power management semiconductor category. Unlike switching regulators, LDOs introduce no switching noise but dissipate more power when VIN-VOUT is large, so they are chosen specifically where noise floor, ripple rejection, and simplicity outweigh efficiency. The LT3090 is engineered around a precision current reference and a high-performance rail-to-rail operational amplifier. This two-stage architecture provides excellent load regulation (Kelvin-sensed at the OUT pin), programmable current limit, and easy paralleling of multiple devices to scale output current or spread heat. The 12-pin MSOP-EP package with exposed pad reduces junction-to-ambient thermal resistance, supporting higher continuous current on a small PCB footprint. Typical applications include negative-supply rails for op-amps and ADCs, industrial -24V bus interfaces, low-noise post-regulation after switching converters, test-and-measurement instrumentation, and any system that needs a clean negative bias. The wide -36V input range also covers telecom -48V systems after a front-end regulator. When designing with this part, place input and output capacitors close to the IC pins, Kelvin-connect the ground side of the SET resistor to the load, and verify that PCB copper area on the exposed pad can absorb worst-case dissipation (estimated Pdiss = (|VIN| - |VOUT|) × IOUT). For demanding thermal conditions, parallel multiple LT3090s on the same footprint to spread heat.
LT3094IMSE -20V 500mA Ultralow Noise Ultrahigh PSRR Negative LDO | ADI
The Analog Devices LT3094IMSE is a -20V, 500mA ultralow-noise, ultrahigh-PSRR negative LDO linear regulator in a 12-pin MSOP-EP package featuring exposed pad for thermal dissipation. It delivers a programmable output from 0V to -19.5V with 0.8 uVrms integrated noise (10 Hz to 100 kHz) and 90 dB PSRR at 1 kHz. A low-dropout (LDO) linear regulator maintains a regulated output voltage using a pass element that operates in its linear region; the LT3094 is a NEGATIVE-output LDO, meaning its output sits below ground (e.g. -5V, -12V) rather than above ground like a conventional LDO. Within the broader taxonomy it belongs to linear regulators, then voltage regulators, then power management ICs, then semiconductors. Negative LDOs are commonly used to bias RF power amplifiers, op-amp negative rails, and high-speed ADC front-ends where a quiet negative supply is mandatory. Key features include a bipolar architecture achieving 0.8 uVrms noise, 90 dB PSRR at 1 kHz, programmable current limit, fast start-up capability, programmable power-good output, and a tracking function that controls an upstream supply to minimize the LT3094's power dissipation and optimize PSRR. A bipolar enable pin and exposed thermal pad complete the integration story for compact, high-performance designs. The architecture uses an internal reference, error amplifier, and pass transistor optimized for ultralow-noise and ultrahigh-PSRR operation; the tracking function uniquely minimizes VIN-to-VOUT drop, reducing on-chip dissipation while preserving PSRR across frequency. This combination enables the part to follow a noisy upstream supply while presenting a clean rail to the load. Typical applications include RF power amplifier biasing, high-speed data converter negative supplies, op-amp negative rails, low-noise instrumentation, and precision test equipment where both ultralow noise and high PSRR are mandatory for system SNR. Industrial temperature grades (-40C to +125C) make the part suitable for factory and outdoor deployments. Designers should size the SET-pin resistor to program output voltage, ensure sufficient input/output capacitance for stability per datasheet curves, and leverage the tracking input to minimize the input-to-output differential in high-current rails. Thermal design must account for the exposed pad soldered to a sufficient copper pour. This page synthesizes distributor pricing, drop-in alternatives and ADI/MSOP-EP application notes not consolidated on a single manufacturer page, giving engineers a faster path from spec to PCB.
LT3469ETS8#TRPBF - 33V Piezo Driver with Boost Regulator
The Analog Devices LT3469ETS8#TRPBF is a transconductance amplifier with an integrated boost regulator, designed to drive piezo speakers and microactuators from a 5 V or 12 V supply while producing output voltages up to 33 V. It supports capacitive loads from 5 nF to 300 nF and is packaged in an eight-pin TSOT-23 surface-mount package. A transconductance amplifier is an amplifier category that converts an input voltage into an output current. In the LT3469, this characteristic is used to drive capacitive piezoelectric loads, where controlled current determines actuator voltage, stress, motion, and mechanical force. The integrated boost regulator supplies the higher voltage required by the output stage, simplifying systems that otherwise need a separate high-voltage supply. The main feature is its 33 V output capability, which provides useful drive range for piezo elements operated above low-voltage logic rails. The device is specified for a maximum input voltage of 16 V and a maximum output current of 40 mA. Its switching-regulator architecture allows the amplifier to develop a boosted output while the transconductance stage controls the piezo load. Because the output slew rate is limited by the maximum output current, load capacitance and required settling time directly influence actuator behavior. Typical applications include piezo speakers, ultrasonic transducers, haptic actuators, microactuators, and compact electromechanical systems. The part is useful when the actuator requires substantially more voltage than the available system rail. Designers should account for capacitor selection, boost-regulator layout, output-current limits, and the high-voltage behavior of the selected piezo element. PCB layout is critical because the SW node has sharp voltage edges and can couple into input and control traces. The Analog Devices datasheet recommends minimizing SW-node copper area, surrounding it with VCC-connected metal on three sides, shielding +IN and -IN, and using a ground plane beneath the switching regulator. Verify the actuator voltage, current, and power requirements before finalizing the external network. This page consolidates verified manufacturer information, distributor availability, package details, and engineering guidance for engineers evaluating the LT3469ETS8#TRPBF as a compact piezo-driver solution.
LT3476EUHF#PBF - Quad 1.5A LED Driver, 38-QFN | Analog Devices
The Analog Devices LT3476EUHF#PBF is a high-current quad-output DC/DC converter IC designed as a constant-current source for driving high-current LEDs, with 4 switch outputs each rated to 1.5 A in a 38-lead QFN (5x7 mm) package. It integrates both step-down (buck) and step-up (boost) capability on a single die, allowing flexible topologic selection per channel to match LED string forward voltage to the supply rail. A fixed-frequency, current-mode architecture provides stable operation across a wide supply and output voltage range, and the user-programmable switching frequency (200 kHz to 2 MHz, set via the RT pin) lets the designer trade efficiency against external component size. A quad-output LED driver is a specialized power management IC that combines four independent constant-current regulator channels into one package. Each channel regulates the current through a string of high-brightness LEDs regardless of forward-voltage variation, which is critical because LED luminance depends on current rather than voltage. Within the broader taxonomy, this part sits in the LED driver subcategory of power management ICs, which itself belongs to the larger family of switched-mode power supply (SMPS) controllers. By providing four matched channels on one die, the LT3476 eliminates the need for four discrete driver ICs and reduces BOM count, board area, and channel-to-channel timing skew in display backlighting or signage designs. Key features include four independent 1.5 A switch outputs, integrated power switches, true PWM dimming capability, and adaptive ballasting for boost topology. The wide VIN range and dual buck/boost support enable designs from a single Li-Ion cell up to multi-LED automotive strings. The exposed pad on the QFN package provides a low thermal resistance path, and the current-mode control loop simplifies compensation while offering cycle-by-cycle current limiting. Typical applications include RGB LED signage, TFT-LCD backlighting, automotive interior/exterior lighting, decorative architectural lighting, and large-format video displays. The 4-channel integration is most useful where color or zone brightness must be independently controlled. When designing with this part, calculate worst-case power dissipation per channel (Pdiss ≈ (VIN - VLED) × ILED for buck) and ensure the PCB copper pour on the exposed pad can sink that heat. Decouple VIN with at least 4.7 µF of X7R ceramic placed within 5 mm of the IC, and keep the RT resistor close to the RT pin to avoid frequency jitter.
LT3496EUFD - Triple 750mA 45V LED Driver w/ 3000:1 PWM Dimming | Analog Devices
The Analog Devices (formerly Linear Technology) LT3496EUFD is a triple-output DC/DC converter designed to operate as constant-current sources for driving high-current LEDs, integrating three independent 750mA / 45V internal switches in a 28-pin QFN (4x5 mm) plastic package with exposed pad. The device functions in step-down (Buck), step-up (Boost), or buck-boost topology on each channel, making it suitable for RGB, white, or multi-string backlight and architectural lighting applications where rail voltage can swing above or below the LED forward voltage. A triple-output LED driver is a power-management IC that combines three independently regulated constant-current channels in a single die. Each channel uses hysteretic-mode control to eliminate the compensation-network design effort typical of PWM controllers, while an internal gate driver provides PMOS LED-disconnect logic for true-color PWM dimming. The LT3496EUFD sits within the broader taxonomy of LED drivers -> power management ICs -> mixed-signal semiconductors, and is typically paired with microcontrollers and serial-interface LED controllers for display backlights. Key specifications include three independent 750mA internal switches rated to 45V, True Color PWM dimming up to a 3000:1 dimming ratio, an integrated PMOS gate driver for LED disconnect during PWM-off intervals, a wide input voltage range suitable for automotive and industrial buses, and adjustable switching frequency. The exposed-pad QFN-28 package provides a low thermal resistance path for dissipating power at full-load conditions across all three channels. According to the manufacturer datasheet, the part supports analog and PWM dimming simultaneously, simplifying implementation of brightness curves in solid-state lighting. Typical applications include RGB LED backlight drivers for LCD monitors and TVs, automotive interior and exterior lighting, architectural and stage lighting fixtures, signage and decorative LED strips, and battery-powered handheld projectors. The wide VIN range and topology flexibility also support industrial 24V bus designs and emergency-vehicle strobe circuits. When designing with this device, derate each channel to no more than 500mA continuous in enclosed fixtures with limited airflow, and place the input/output capacitors and the boost diode as close to the IC as the PCB allows. The PWM dimming pin accepts logic-level signals from any microcontroller timer, and the PMOS gate driver must be connected to an external P-channel MOSFET rated for the channel voltage. This page synthesizes distributor pricing, drop-in alternatives, and practical application guidance beyond what the manufacturer datasheet provides.
LT3748EMS#PBF - 100V Isolated Flyback Controller | Analog Devices
The Analog Devices LT3748EMS#PBF is a 100V isolated flyback controller for high-power, isolated step-up and step-down DC-DC conversions, operating from 5V to 100V in a 16-MSOP package. It drives a low-side external N-channel power MOSFET from an internally regulated 7V supply and uses boundary-mode operation to support compact magnetics. The controller is designed for isolated flyback topologies and can deliver load power of several tens of watts when paired with a suitable external MOSFET and transformer. A flyback controller is a switching-regulator controller that uses an energy-storage transformer to transfer power across an isolation barrier. The LT3748EMS#PBF belongs to the DC-DC converter and isolated power-supply hierarchy, combining high-voltage input capability, boundary-mode control, and external power-stage design flexibility. Its isolation-capable architecture is useful where the output must be electrically separated from the input source. Key verified features include a 5V to 100V input operating range, a 100V isolated flyback-controller rating, boundary-mode operation, low-side external N-MOSFET drive, internally regulated 7V gate-drive supply, and load regulation of ±5% over the specified line, load, and temperature ranges. The 16-MSOP package supports compact isolated power modules while leaving the MOSFET and transformer selection to the designer. The LT3748 is intended for isolated auxiliary supplies, industrial equipment, telecom power systems, data-acquisition equipment, instrumentation, and high-voltage DC-DC converters. The boundary-mode approach can reduce transformer size while maintaining load regulation, but final efficiency, isolation, voltage accuracy, and thermal performance depend on the external transformer, MOSFET, compensation, layout, and output components. Designers should select an external MOSFET with adequate voltage and current ratings, verify transformer isolation and saturation margins, and keep high-current switching loops compact. The controller’s 100V input capability does not remove the need for surge protection, input filtering, creepage, clearance, and safety validation in the completed isolated converter. This page summarizes verified source information and clearly identifies specifications that require additional data.
LT3753IFE - 100V Active Clamp Forward Controller | Analog Devices
The Analog Devices LT3753IFE is a current-mode PWM controller optimized for active clamp forward converter topologies, operating across an 8.5V to 100V input range and housed in a 38-pin TSSOP-EP (Thermally Enhanced) package. The device integrates a programmable volt-second clamp that permits primary-side switch duty cycles above 50%, which improves transformer, switch, and rectifier utilization efficiency. The IC's active clamp control architecture reduces primary switch voltage stress and recovers transformer leakage energy, while a synchronous output drives secondary-side synchronous rectification MOSFETs for higher system-level efficiency. An active clamp forward controller is a current-mode PWM IC purpose-built for isolated forward converter topologies used in industrial, telecom, and distributed-bus power designs. Active clamp resets the power transformer using an auxiliary MOSFET and capacitor instead of a dissipative snubber or simple reset winding, which boosts efficiency, enables duty cycles above 50%, and lowers primary switch voltage stress. Forward controllers sit within the broader hierarchy: PWM controller -> DC-DC switching controller -> power management IC -> semiconductor. Key features include programmable volt-second clamp, current-mode control with slope compensation, programmable soft-start, an internal 5V LDO for housekeeping, and an internal 100V start-up bias regulator that eliminates external bootstrap components. The synchronous rectifier (SR) timing output simplifies secondary-side synchronous MOSFET control. The 38-TSSOP-EP package exposes a thermal die pad (theta_JA around 30 C/W with proper PCB copper), enabling high-power isolated designs without external heatsinking. Architecture depth: the LT3753 uses peak current-mode control with programmable slope compensation to support both voltage- and current-mode transformers without subharmonic instability. The volt-second clamp circuitry monitors the OUT/transformer reset waveform and terminates the primary switch ON-time when the programmed volt-second product is reached, eliminating duty-cycle dependence on input voltage variations. The internal 5V LDO powers the IC's logic and SR gate drive from the high-voltage INTVCC rail. Typical applications include 24V to 48V isolated telecom bus converters, industrial 24V/48V distributed bus intermediate bus converters (IBCs), isolated bias supplies for gate drivers and analog front-ends, and high-density 48V-input server/ATE point-of-load front ends. Synchronous rectification enables efficiency peaks of 92-95% in well-tuned designs. Design consideration: the active clamp capacitor value is set by the desired transformer reset time and volt-second clamp setting; too-small capacitance causes incomplete reset and transformer saturation, while too-large capacitance slows regulation response. Use the manufacturer datasheet to size the clamp capacitor, primary inductance, and slope compensation resistor for the chosen transformer turns ratio.
LT3758EMSE - 100V Boost/Flyback/SEPIC Controller | ADI
The Analog Devices (formerly Linear Technology) LT3758EMSE is a high-input-voltage current-mode DC/DC controller capable of generating either positive or negative output voltages from a 5.5V to 100V input rail. Housed in a 10-pin MSOP-EP package with exposed pad for improved thermal dissipation, it supports switching frequencies from 100kHz to 1MHz and can be configured as a boost, flyback, SEPIC or inverting converter via the novel FBX pin architecture. A DC/DC controller (also called a switching controller or SMPS controller) is an IC that drives an external power MOSFET or switch to convert one DC voltage to another using high-frequency switching and magnetic components. It sits in the power management hierarchy between a switching regulator (which integrates the power switch) and a fully integrated point-of-load (PoL) module. Unlike a linear regulator, a switching controller achieves high efficiency across wide VIN/VOUT ratios by storing energy in an inductor and releasing it at a different voltage, but requires careful PCB layout and external component selection. Key features of the LT3758EMSE include a 5.5V to 100V input voltage range, programmable operating frequency from 100kHz to 1MHz set by an external resistor, optional external clock synchronization via the SYNC pin, 1µA typical shutdown quiescent current for battery-powered systems, and an internal 7.2V gate driver capable of driving standard N-channel MOSFETs. The novel FBX pin accepts feedback directly from a positive or negative output divider, eliminating the need for level-shifting circuitry in inverting converter topologies. The LT3758EMSE uses current-mode control with a precision internal reference, providing excellent line and load regulation, cycle-by-cycle current limiting, and simple loop compensation. Demonstration circuit DC1342A from Analog Devices showcases the part in a 300kHz flyback converter delivering 3.3V/3A from an 18V to 75V input, validating its suitability for telecom and industrial bus voltage conversion. Typical applications include 24V to 48V telecom bus converters, automotive 12V/24V battery-powered systems, isolated flyback power supplies for industrial sensors, and SEPIC converters for battery charging. The wide VIN range also makes it ideal for distributed power architectures fed from rectified 110V/220V AC lines. When designing with the LT3758EMSE, ensure the input capacitor, power inductor, and current-sense resistor are sized for the worst-case VIN and load transients. The exposed pad must be soldered to a sufficiently large copper pour to keep junction temperature within the -40°C to +125°C operating range. This page synthesizes distributor pricing, drop-in alternatives from the same Linear Technology/Analog Devices controller family, and practical design notes that go beyond the manufacturer datasheet to accelerate your evaluation.
LT3782EFE - 2-Phase Step-Up DC/DC Controller | Analog Devices
The Analog Devices LT3782EFE is a current mode 2-phase step-up (boost) DC/DC converter controller with switching frequencies up to 500 kHz, 10 V MOSFET gate drive (at VCC >= 13 V), and 4 A peak gate drive current, housed in a 28-pin TSSOP with exposed pad (FE) package. A boost converter controller is a power management IC that drives external N-channel MOSFETs and inductors to step a lower input voltage up to a higher regulated output. Unlike monolithic regulators, a controller integrates only the PWM control loop, error amplifier, and gate drivers, so the power stage is external and scalable to very high output power. In the hierarchy of power management ICs, the LT3782EFE sits at the top of the power range: switching controller -> switching regulator -> voltage regulator. The LT3782EFE's defining feature is 2-phase interleaved operation: two boost power stages switch 180 degrees out of phase, which cancels input and output ripple currents and reduces required filtering capacitance and inductance. This directly lowers BOM cost, board area, and output ripple. Because phase interleaving doubles effective switching frequency at the terminals, output ripple voltage shrinks for a given capacitor bank. Technically, the LT3782 uses a current mode architecture with a transconductance (gm) error amplifier regulating the output voltage and commanding the PWM current loop. The datasheet block diagram shows PWM logic and flip-flops, two high-speed gate drivers rated for 10 V gate drive and 4 A peak current, and 2-phase control signals capable of driving most industrial-grade high-power MOSFETs with high efficiency. The 10 V gate drive (VCC >= 13 V) fully enhances standard industrial MOSFETs, minimizing RDS(ON) losses at high current. Typical applications include industrial 24 V to 48 V bus step-up supplies, high-power telecom and battery-backup boost converters, and automotive or heavy-equipment power systems where robust 40 V-class input tolerance matters. Design consideration: with 10 V gate drive the controller needs VCC at or above 13 V for full gate swing; at lower VCC consult the datasheet gate-drive curves before selecting MOSFETs. This page adds distributor pricing context, same-family drop-in variants, and practical design notes not found in the manufacturer datasheet.
LT3782EFE#PBF - 2-Phase 500kHz Boost Controller | ADI | 28-TSSOP-EP
The Analog Devices LT3782EFE#PBF is a current-mode, two-phase step-up (boost) DC/DC converter controller housed in a 28-pin TSSOP-EP (HTSSOP) package with exposed thermal pad. It operates from 6V to 40V input, supports switching frequencies up to 500 kHz, and delivers 4 A peak gate-drive current with 10 V gate drive (when Vcc ≥ 13 V), enabling efficient driving of industrial-grade high-power MOSFETs. A boost (step-up) DC/DC controller is a type of switching voltage regulator that produces an output voltage higher than its input voltage by storing energy in an inductor and releasing it into the output capacitor through a power switch. Two-phase interleaved operation, as implemented in the LT3782, runs two boost phases 180° out of phase, which halves the input/output ripple current amplitude and doubles the effective ripple frequency. The result is smaller magnetics, lower EMI, and reduced filter capacitance versus a single-phase equivalent. Within the broader taxonomy: boost controller -> DC/DC switching controller -> power management IC -> semiconductor. Key features include 6 V to 40 V input range (Vcc start-up as low as 6 V with operation down to 4 V after start), adaptive or programmable current-mode control, internal 4 A gate drivers for both top and bottom MOSFETs in each phase, programmable switching frequency up to 500 kHz, and synchronizable to an external clock. The TSSOP-28 EP package offers thermal resistance θJA near 28 °C/W on a standard JEDEC 4-layer board, supporting the high-power dissipation expected of a 2-phase high-current boost stage. The 2-phase architecture also benefits high-current applications because it spreads power dissipation across two inductors and two MOSFET pairs, reducing per-component thermal stress. Synchronous rectification is supported by the bottom-gate driver output on each phase, allowing use of low-Rds(on) N-channel MOSFETs for high-efficiency conversion. Programmable soft-start, current limit, and synchronization round out the feature set. Typical applications include 12 V/24 V to 48 V industrial bus converters, automotive 12 V step-up pre-regulators for audio amplifiers, telecom hold-up converters, and any high-current (>10 A) boost topology where input ripple and EMI must be minimized. The LT3782 is well suited to systems where two single-phase converters would otherwise be paralleled. Designers should size the two inductors with a 180° phase relationship, use low-ESR ceramic or polymer output capacitors, and connect the exposed pad (EP) to a large copper pour to manage MOSFET-driving losses. For very high output currents, sync-MOSFETs and Schottky rectifiers should be selected to minimize conduction loss. This page consolidates distributor pricing, verified drop-in alternatives, and engineering design notes that go beyond the ADI datasheet's typical application section.
LT3782EFE#TRPBF - 2-Phase Boost DC/DC Controller, 500kHz | ADI
The Analog Devices LT3782EFE#TRPBF is a current-mode 2-phase step-up DC/DC converter controller housed in a 28-pin TSSOP-EP (TSSOP-28 with exposed pad) package. Its high switching frequency up to 500 kHz and 2-phase architecture reduce required input/output filtering capacitance and inductance. The device delivers 10 V gate drive (VCC >= 13 V) with 4 A peak gate-drive current to drive industrial-grade high-power MOSFETs efficiently. Operating input range covers 6 V to 40 V, making the controller suited to 12 V, 24 V, and 40 V industrial bus rails. A two-phase boost controller is a current-mode switching regulator that interleaves two converter phases 180 degrees out of phase. This interleaving halves the input ripple current and doubles the effective switching frequency seen by the input filter, allowing the use of smaller magnetics and capacitors. The controller sits in the broader hierarchy of DC/DC converters -> switching regulators -> power management ICs -> semiconductors, and is the high-power counterpart to single-phase boost controllers when output currents exceed what a single phase can comfortably supply. Key features include programmable switching frequency, selectable two-phase or single-phase operation, synchronizable oscillator, soft-start, and adaptive dead-time control for synchronous MOSFET applications. The 4 A peak gate-drive capability supports high-Ciss MOSFETs without external gate drivers, while the 10 V gate drive is compatible with standard threshold N-channel power MOSFETs. The TSSOP-EP package provides a thermal pad for improved heat dissipation and reliable operation at high switching currents. The 2-phase topology reduces input RMS current by approximately 50% compared with single-phase equivalents at the same load, decreasing input capacitor stress and EMI. Adaptive dead-time control prevents cross-conduction in synchronous rectifier configurations. The internal soft-start and current-mode control simplify loop compensation and enable reliable step-up conversion from wide-input sources to high-output voltages required by industrial, automotive, and telecom systems. Typical applications include high-power LED drivers, industrial 24 V to high-voltage DC bus conversion, automotive audio amplifier supplies, telecom -48V hold-up converters, and high-voltage bias generators for LCD backlights. The wide 6V-40V input tolerates load-dump and transients commonly encountered in industrial and automotive environments. When designing with this device, ensure the exposed pad is soldered to a sufficiently large copper pour for thermal dissipation. Select the inductor and input capacitor based on the desynchronized ripple current of each phase. Use proper PCB layout to minimize switching-node area and reduce EMI.
LT3790EFE - 60V 4-Switch Sync Buck-Boost Controller | ADI
The Analog Devices LT3790EFE is a 60V synchronous 4-switch buck-boost controller that regulates output voltage, output current, or input current with input voltages above, below, or equal to the output voltage, packaged in a 38-lead TSSOP with an exposed thermal pad. It accepts a wide 4.7V to 60V input range, supports an adjustable output of 1.2V to 60V, and delivers up to 10A of output current with up to 98.5% efficiency through its constant-frequency current-mode architecture. A buck-boost controller is a DC-DC switching converter topology that uses a single inductor and four switches to step the input voltage up or down (or pass it through) while maintaining a regulated output. The 4-switch single-inductor architecture of the LT3790 eliminates the need for a transformer, providing a compact solution for systems where the battery or supply can swing above and below the desired rail (for example, a 12V lead-acid battery feeding a regulated 12V load, or a USB-PD source feeding a 20V load). Key features include programmable switching frequency from 200 kHz to 700 kHz with external clock synchronization, constant-frequency current-mode control for stable loop compensation, and integrated MOSFET drivers. Protection features include input current limiting, output current regulation, open-drain SHORT pin flag, and over-temperature protection. Typical applications include high-power battery charging systems, automotive LED driver front-ends, regulated high-voltage supplies, and industrial 24V/48V bus converters. The TSSOP-38 exposed-pad package provides a thermal resistance of approximately 28 C/W on a 4-layer JEDEC board, enabling several watts of dissipation without external heatsinking. The 60V absolute-maximum rating also gives substantial headroom for 36V or 48V industrial transients. Designers should select the external inductor, sense resistors, and feedback network per the LT3790 datasheet typical application circuit; the constant-frequency current-mode loop accepts standard type-II compensation. Use the SHORT pin as a power-good or fault flag in supervisory logic. This page synthesizes distributor pricing, drop-in 38-TSSOP-EP alternatives, and practical design notes not found in the manufacturer datasheet alone.
LT3790EFE#PBF - 60V Sync 4-Switch Buck-Boost Controller | ADI
The Analog Devices LT3790EFE#PBF is a synchronous 4-switch buck-boost voltage/current regulator controller housed in a 38-pin TSSOP with exposed pad (TSSOP-38 EP). It regulates output voltage, output current, or input current with input voltages above, below, or equal to the output voltage, supporting input range of 4.7 V to 60 V and adjustable output of 1.2 V to 60 V with up to 10 A output current capability. A buck-boost converter is a switched-mode DC-DC topology that seamlessly transitions between buck (step-down) and boost (step-up) operation, maintaining a regulated output even when the input voltage crosses the output voltage. Buck-boost controllers sit within the broader hierarchy of DC-DC converters -> switching regulators -> power management ICs -> semiconductors. They are preferred over two-stage cascaded solutions when VIN can dip below or rise above VOUT, eliminating the need for separate boost and buck stages and improving efficiency. Key features of the LT3790 include 4-switch synchronous rectification for high efficiency, constant-frequency current-mode architecture, programmable switching frequency, and a status flag (SHORT) that asserts when the FB pin drops below 400 mV with VSENSE above 5 mV. The wide 4.7 V to 60 V input range supports automotive load-dump transients, 24 V industrial buses, and high-cell-count battery packs. Output disconnect is inherent in the topology, preventing DC current flow when VOUT is shorted to ground. The LT3790 uses peak current-mode control with a precision reference and adaptive shoot-through protection on the four N-channel MOSFET drivers. Its 200 kHz to 700 kHz programmable frequency (200 kHz default) allows designers to trade efficiency versus external inductor and capacitor size. Internal ±2% reference accuracy and cycle-by-cycle current limiting simplify compliance with AEC-Q100 and similar noise/ripple requirements. Typical applications include high-power LED drivers, battery charging systems for 12 V/24 V/48 V packs, USB Power Delivery (PD) and other wide-range input converters, solar charge controllers, and automotive infotainment/lighting rails. The 4-switch topology also makes it suitable for industrial telematics and robotics power where the input bus can vary widely. When designing with the LT3790, select four N-channel MOSFETs with adequate drain-source breakdown for the maximum VIN plus ringing margin, and use a low-ESR ceramic or polymer output capacitor bank sized to meet the dynamic load step requirement. The exposed pad must be soldered to a sufficiently large copper pour to keep junction temperature within the -40 C to +125 C operating range. This page synthesizes distributor pricing, same-family and cross-brand drop-in alternatives, and practical PCB/thermal design notes not found in the manufacturer datasheet alone.
LT3790EFE#TRPBF - 60V Sync 4-Switch Buck-Boost Controller | ADI
The Analog Devices LT3790EFE#TRPBF is a synchronous 4-switch buck-boost voltage and current regulator controller housed in a 38-pin TSSOP-EP exposed-pad package. It operates from 4.7V to 60V input, supports output voltages from 1.2V to 60V, and uses constant-frequency current-mode architecture adjustable from 200kHz to 700kHz. The device regulates output voltage, output current, or input current with input voltages above, below, or equal to the output voltage, eliminating top-FET refresh switching noise. A buck-boost controller is a type of DC-DC switching regulator that maintains a regulated output whether the input rail sits above, below, or equal to the output rail. The four-switch (H-bridge) topology combines a synchronous buck and a synchronous boost, transferring seamlessly across all three operating modes. Within the broader power management hierarchy, the LT3790 sits between buck-only or boost-only regulators and full-bridge converters, offering single-IC flexibility for systems with wide VIN variation. Key features include 60V absolute maximum input, 200kHz-700kHz programmable/synchronizable switching frequency, current-mode control with cycle-by-cycle current limiting, adjustable soft-start, input current limiting, output current limiting, and a built-in topology switchover that eliminates the third-quadrant refresh pulse typical of competing solutions. The exposed thermal pad supports high-power dissipation up to several watts, enabling compact industrial designs. The LT3790 uses a proprietary architecture that avoids the top-FET refresh switching common in 4-switch controllers, reducing switching losses and EMI while improving efficiency at light load. The constant-frequency current-mode control simplifies loop compensation and enables parallel operation for higher output current. Typical applications include automotive 12V/24V battery systems, industrial 24V/48V bus converters, battery-powered systems with wide VIN range, solar power conditioning, and high-power LED drivers. The wide input range and 60V absolute maximum also make it suitable for telecom 48V rails. When designing with this device, select MOSFETs with adequate VDS margin (80V or 100V for a 60V system) and use the exposed pad with sufficient copper for thermal dissipation. The efficiency at high VIN depends heavily on MOSFET RDS(ON) and gate charge selection. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, providing a one-stop engineering reference for LT3790EFE#TRPBF selection.
LT3791EFE#PBF - 60V 4-Switch Sync Buck-Boost LED Driver | ADI
The LT3791EFE#PBF from Analog Devices is a synchronous 4-switch buck-boost LED driver controller capable of regulating LED current up to 52V with input voltages above, below, or equal to the output voltage. Housed in a 38-pin TSSOP-EP package, this controller supports a wide input voltage range and delivers high efficiency up to 98.5%. A buck-boost LED driver controller is a power management IC that regulates current through an LED string by controlling four external MOSFETs in a single-inductor topology. It can step up or step down the input voltage to maintain a constant LED current, making it essential for applications where the supply voltage varies around the LED forward voltage. This controller sits within the hierarchy of LED drivers, which are part of power management integrated circuits used in lighting systems. Key features include a 4-switch single-inductor architecture that allows VIN above, below, or equal to VOUT, synchronous switching for efficiency up to 98.5%, a wide input voltage range, and 2% output voltage accuracy. The controller supports both analog and PWM dimming, with a frequency adjustable or synchronizable from 200kHz to 700kHz. It also provides open LED and short LED protection, along with a precision current sense amplifier. The LT3791EFE#PBF uses a constant-frequency, current-mode architecture with forced-continuous operation, ensuring stable operation across all conditions. The 4-switch topology eliminates the need for a separate boost and buck stage, reducing component count and board space. The controller can regulate LED current with ±2% accuracy, and its wide input range makes it suitable for automotive, industrial, and general lighting applications. Typical applications include automotive headlamps, industrial lighting, and high-power LED drivers. The device is ideal for battery-powered systems where input voltage varies, such as in vehicles or portable equipment. Its ability to operate with input voltages above or below the LED string voltage makes it versatile for various LED configurations. When designing with this controller, ensure proper PCB layout for the high-current switching paths and adequate thermal management for the external MOSFETs. The frequency synchronization pin allows multiple controllers to operate at the same frequency, reducing EMI in multi-channel designs.
LT3791EFE#TRPBF - 60V 4-Switch Sync Buck-Boost LED Driver | ADI
The LT3791EFE#TRPBF from Analog Devices is a synchronous 4-switch buck-boost LED driver controller designed to regulate LED current up to 52V with input voltages above, below, or equal to the output voltage. Housed in a 38-pin TSSOP-EP package, this controller supports constant-frequency, forced-continuous current mode operation, enabling efficient and accurate LED current regulation across a wide input range. A buck-boost LED driver controller is a specialized power management IC that combines step-down (buck) and step-up (boost) topologies to maintain a regulated output current regardless of whether the input voltage is higher or lower than the LED string voltage. This makes it ideal for automotive, industrial, and general lighting applications where input voltage variations are common. The LT3791 belongs to the family of switching regulators, specifically DC-DC controllers, which are essential in power management systems for converting and regulating electrical power efficiently. Key features include a wide 4.7V to 60V input voltage range, adjustable switching frequency from 200kHz to 700kHz, and the ability to synchronize to an external clock. The controller provides analog and PWM dimming, with PWM dimming capable of achieving high contrast ratios. Its 4-switch architecture allows seamless transitions between buck, boost, and buck-boost modes, ensuring stable operation across the entire input range. The device also includes features such as open LED protection, short-circuit protection, and a precision current sense amplifier. Technically, the LT3791 uses a current mode control architecture with a 4-switch synchronous topology, which improves efficiency by eliminating the need for external Schottky diodes. The controller can drive external N-channel MOSFETs, allowing designers to scale the solution to high-power applications. The forced-continuous current mode ensures predictable operation and simplifies EMI filtering. The device operates over a -40°C to 125°C junction temperature range, making it suitable for harsh environments. Typical applications include automotive LED lighting (headlights, daytime running lights), industrial lighting, and general-purpose constant-current LED drivers. Its wide input range and high output voltage capability make it particularly well-suited for LED strings in series, where the total forward voltage can be significant. When designing with the LT3791, careful attention must be paid to the switching node layout and the selection of external components, such as inductors and MOSFETs, to ensure stable operation and meet EMI requirements. The datasheet provides detailed application circuits and component selection guidelines.
LT3950EMSE - 60V 1.5A LED Driver w/ Exponential Dim | ADI
The Analog Devices LT3950EMSE is a 60 V, 1.5 A constant-current/voltage LED driver IC with internal exponential scale PWM dimming, housed in a 16-pin MSOP-EP package with an exposed thermal pad. It integrates a 1.5 A, 60 V internal DMOS power switch, supports multitopology operation (boost, buck, SEPIC, buck-boost, flyback, Ćuk), and runs at a fixed 2 MHz switching frequency that allows small ceramic input and output capacitors. The integrated PWM generator maps an analog control voltage (CTRL pin) to an exponential dimming profile, mimicking the human eye's logarithmic response to light intensity. A DC/DC LED driver is a switch-mode power supply specifically engineered to regulate current through a string of high-brightness LEDs rather than regulate output voltage. Within the broader power management IC hierarchy, the LT3950EMSE sits between general-purpose DC-DC converters (LM2591, LMR33640) and lighting-specific drivers (LM3405, LP5024). By combining the inductor-based switching converter and a constant-current regulation loop in one IC, the part eliminates the discrete sense resistor, op-amp, and MOSFET network that a discrete solution would otherwise require, simplifying BOMs in solid-state lighting designs. Key features include a wide 3 V to 60 V input range, 1.5 A internal switch rating, 200 mV current sense voltage (reducing conduction loss), open-drain fault indicator, programmable soft-start, and an auxiliary PWM input pin for synchronizing the LED brightness to an external MCU. The 2 MHz switching frequency stays above the AM band, while the internal exponential dimming generator removes the need for firmware-based gamma correction. Quiescent current is typically under 1 mA in shutdown. The LT3950EMSE uses a constant-frequency peak-current-mode control architecture. The internal high-side DMOS switch and current sense amplifier form the inner current loop, while an external resistor on the SENSE pin programs the LED current setpoint. The exposed pad (EP) of the MSOP-16 provides a low-thermal-resistance path (θJA ≈ 38 °C/W on a 4-layer JEDEC JESD51-7 board) so 1.5 A operation is feasible without an external heatsink for moderate VIN-VOUT differentials. Typical applications include automotive daytime running lights, architectural and signage lighting, MR16 and AR111 LED retrofit lamps, constant-current LED strings, and backlight drivers for industrial displays. Its 60 V rating also makes it suitable for 36 V industrial bus rails or 48 V telecom supply chains. When designing with this part, pay attention to inductor saturation current (must exceed 2 A), input bulk capacitance for hot-plug events, and PCB thermal copper under the exposed pad. A common pitfall is leaving the exposed pad unsoldered, which can raise junction temperature by 20-30 °C and trigger thermal shutdown at 1.5 A. This page synthesizes distributor pricing, drop-in alternatives, application notes, and design guidance not consolidated in any single vendor listing, helping engineers select and source the LT3950EMSE faster.
LT3971EMSE - 38V, 1.2A, 2MHz Buck Regulator | Analog Devices
The Analog Devices LT3971EMSE is an adjustable-frequency monolithic buck switching regulator that accepts a wide input voltage range up to 38V and delivers up to 1.2A of output current in a 10-lead MSOP-10 (MSE) package with an exposed pad for low thermal resistance. Key headline parameters: 38V maximum input voltage, 1.2A continuous output current, and 2.8µA quiescent current with Burst Mode operation. The switching frequency is user-programmable from 200kHz to 2MHz, allowing optimization between efficiency and external component size. What is a buck switching regulator? A buck (step-down) switching regulator is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower regulated output voltage by rapidly switching an inductor and using energy storage elements. Within the broader taxonomy, a buck regulator belongs to switching regulators, which are a subset of DC-DC converters, which in turn are a type of voltage regulator under the power management IC umbrella. The LT3971 features Burst Mode operation that consumes only 2.8µA of quiescent current while regulating with no load, making it ideal for always-on applications and battery-powered systems where standby current is critical. The accurate 1V threshold enable pin allows the regulator to be shut down, reducing input supply current to 700nA, which preserves battery life during deep sleep states. A capacitor on the SS pin provides programmable soft-start, controlling inrush current at power-up. A power good flag signals when VOUT reaches 91% of the programmed output voltage, useful for multi-rail sequencing in complex systems. The internal architecture uses a 1.9A peak switch current limit, providing headroom beyond the 1.2A continuous rating for transient loads. The high switching frequency capability (2MHz) allows use of compact inductors and ceramic output capacitors, minimizing the overall solution footprint — particularly valuable in space-constrained portable designs. The MSOP-10 exposed pad package offers a thermal resistance suitable for moderate power dissipation. Typical applications include automotive battery regulation, portable industrial instruments, distributed supply regulation, battery-powered devices, and always-on systems requiring low standby current. The wide 38V input range tolerates load-dump transients and industrial 24V rails. When designing, pay close attention to the inductor selection: choosing a shielded inductor with appropriate saturation current and DC resistance optimizes efficiency. Place input/output ceramic capacitors close to the IC and route the exposed pad directly to a copper pour for thermal management. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
LT3971EMSE#PBF - 38V, 1.2A, 2MHz Buck Regulator | Analog Devices
The Analog Devices LT3971EMSE#PBF is an adjustable-frequency monolithic buck switching regulator that accepts a wide input voltage range up to 38V and delivers up to 1.2A of output current in a 10-pin MSOP with exposed pad (MSE) package. It operates with a low quiescent current of only 2.8uA at no load, supporting battery-powered and always-on applications. The switching frequency is user-programmable from 200kHz to 2MHz, allowing optimization between efficiency and external component size. A buck (step-down) switching regulator is a type of DC-DC converter that efficiently reduces a higher DC input voltage to a lower DC output voltage by rapidly switching a power transistor and storing energy in an inductor. Buck regulators occupy the middle tier of the power-management hierarchy: DC-DC converter -> switching regulator -> buck converter -> power management IC. They are preferred over linear regulators in high-ratio step-down applications because they avoid the large (VIN-VOUT) x IOUT power dissipation inherent to LDOs, achieving typical efficiencies of 85-95%. Key features of the LT3971EMSE#PBF include low ripple Burst Mode operation for high efficiency at light loads, an accurate 1V threshold enable pin (with 700nA shutdown current), a soft-start pin for controlled inrush current, and a power-good flag that signals when VOUT reaches 91% of the programmed value. The internal compensation and 1.2A switch current rating simplify design while reducing external BOM count. The 10-pin MSOP exposed pad package provides a low thermal-resistance path, supporting full 1.2A operation in industrial temperature grades (E: 0C to 125C junction, -40C to 125C by design). Typical applications include automotive battery regulation, industrial 24V bus point-of-load conversion, distributed power systems, portable battery-powered equipment, and always-on alarm/keep-alive supplies where the 2.8uA quiescent current is critical. When designing with the LT3971EMSE#PBF, choose the inductor and input/output capacitors based on the programmed switching frequency and load transients; higher switching frequencies permit smaller inductors but trade off switch losses.
LT3971EMSE-3.3 - 38V, 1.2A, 2MHz Buck Regulator | Analog Devices
The Analog Devices LT3971EMSE-3.3#PBF is a 38V, 1.2A, 2MHz monolithic step-down switching regulator with a fixed 3.3V output, packaged in a 10-lead MSOP with exposed thermal pad. It accepts a wide 4.3V to 38V input range, features only 2.8 µA quiescent current, and uses low-ripple Burst Mode operation to maximize efficiency at light loads. A buck (step-down) switching regulator is a DC-DC converter that produces a lower output voltage than its input by rapidly switching an inductor and storing energy in that inductor, then releasing it through a rectifier into an output capacitor. Buck regulators sit within the power management IC hierarchy (buck -> DC-DC converter -> voltage regulator -> power management IC) and are favored over linear regulators for their high efficiency, especially when VIN significantly exceeds VOUT. The LT3971 family is purpose-built for automotive and industrial applications where high input transients and very low standby drain matter. Key features include a programmable switching frequency from 200 kHz to 2 MHz, internal 1.2A switch, 2.8 µA Iq with output regulating at no load, fixed 3.3V or 5V and adjustable versions, internal compensation, and internal boost diode. The 10-lead MSOP-EP package offers a thermal resistance suitable for sustained 1.2A operation when properly footprinted, and the exposed pad must be soldered to a sufficiently large copper pour. Architecturally the LT3971 uses a current-mode control loop with a precision reference and an integrated power switch. The very low IQ allows it to maintain output regulation while drawing only micro-amps from the battery, and Burst Mode operation skips switching cycles at light load to keep efficiency high and output ripple low. Programmable frequency up to 2 MHz enables designers to choose frequencies above the AM band or outside sensitive IF bands, and to use small ceramic capacitors and inductors. Typical applications include automotive battery-powered systems, portable instruments, industrial control loops, and any 12V/24V supply rail that must deliver 3.3V with high efficiency. Its wide input range also makes it ideal for load-dump tolerant designs and battery-powered equipment that must operate down to deeply discharged battery voltages. When designing with this part, ensure the exposed pad is soldered over adequate copper (typically >=1 square inch) to keep junction temperature within ratings. Keep the input capacitor loop short to minimize ringing on the SW node, and choose an inductor with low DCR to preserve efficiency. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not found in the manufacturer datasheet alone, accelerating component selection.
LT3971EMSE-3.3#PBF - 38V, 1.2A, 2MHz Buck Regulator | Analog Devices
The Analog Devices LT3971EMSE-3.3#PBF is an adjustable-frequency monolithic buck switching regulator that accepts a wide input voltage range up to 38V and delivers a fixed 3.3V output at up to 1.2A, housed in a 10-pin MSOP with exposed pad (MSE) package. The device features a 2.8 µA quiescent current, low-ripple Burst Mode operation, and a switching frequency up to 2 MHz, enabling compact designs with small inductors and ceramic capacitors. A buck (step-down) switching regulator is a DC-DC converter that efficiently reduces a higher DC input voltage to a lower DC output voltage by rapidly switching a power transistor and smoothing the resulting pulse train with an LC filter. The LT3971 family occupies the hierarchy: buck regulator → switching regulator → DC-DC converter → power management IC → semiconductor. Compared with linear regulators, buck regulators achieve much higher efficiency at large VIN/VOUT ratios, making them preferred for battery-powered and automotive systems where thermal dissipation is a concern. The LT3971's key features include a 4.3V to 38V input range, integrated power switch, 700 nA shutdown supply current (via an accurate 1V threshold enable pin), programmable soft-start with a capacitor on the SS pin, and a power-good flag that asserts at 91% of the programmed output voltage. The MSE package combines a small 10-pin MSOP outline with an exposed thermal pad for low thermal resistance. Internally, the LT3971 uses a current-mode control topology with Burst Mode operation that allows the regulator to maintain output voltage with only 2.8 µA quiescent current at no load - ideal for always-on battery systems. The high 2 MHz switching capability supports small inductor and capacitor selection, while the 38V absolute maximum input accommodates load-dump and cold-crank transients in 12V automotive rails. Typical applications include automotive battery-powered systems, industrial control supplies, portable instrumentation, distributed supply regulation in 24V industrial buses, and always-on housekeeping rails in IoT nodes. The wide VIN range also suits solar and telecom point-of-load regulation downstream of a higher-voltage bus. When designing, prioritize input bulk capacitance to handle inductor ripple, place the BST capacitor close to the SW and BST pins, and use a low-ESR ceramic output capacitor for ripple performance. The exposed pad must be soldered to a sufficiently large copper pour to keep junction temperature within the 125°C limit. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.