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LM5069MM-1/NOPB - 80V Hot Swap Controller, Latch-Off | TI
The Texas Instruments LM5069MM-1/NOPB is a 9V-to-80V positive hot-swap / inrush current controller with power limiting, housed in a 10-pin VSSOP (DGS) package and rated for -40C to +125C operation. It integrates the analog control loop for driving an external N-channel MOSFET across a wide operating voltage range, with internal charge pump, programmable current limit, and a circuit-breaker / latch-off fault response that disables the pass FET after a fault detection. A hot-swap controller is a specialized power-management integrated circuit that controls the inrush current when a printed circuit board is inserted into a live backplane, allowing the bulk capacitors on the board to charge safely while protecting the connector, the MOSFET pass element, and the upstream supply from stress. Hot-swap controllers sit within the broader hierarchy of power-management ICs, between upstream OR-ing controllers / eFuses and downstream point-of-load (POL) regulators. The LM5069 family specifically addresses positive high-voltage rails up to 80V, making it a key building block in -48V telecom, 24V industrial, and 12V/24V/48V distributed-bus systems. Key features include a 9V-to-80V operating range, 100V absolute maximum on VIN, programmable current limit with external sense resistor, programmable inrush dV/dt control, programmable undervoltage and overvoltage lockout with hysteresis, power-limiting foldback during startup, and a fault timer. The LM5069-1 variant latches off after a fault, requiring manual reset, while the LM5069-2 variant auto-restarts at a fixed duty cycle. Architecturally, the LM5069 uses an internal charge pump to drive the external N-FET gate above VIN, an external sense resistor (RSENSE) for cycle-by-cycle current sensing, and a transconductance amplifier that closes the loop on the inrush profile. The TIMER pin capacitor sets the fault integration period, while the UVLO/OVLO dividers on the EN / UVLO pin set the input voltage window. Compared to discrete inrush solutions, the LM5069 reduces BOM count, improves fault repeatability, and provides telemetry-grade protection that meets the requirements of telecom (NEBS) and industrial (IEC 61131-7-1) hot-swap cards. Typical applications include -48V telecom line-card hot swap, 24V industrial PLC and motor-drive bus protection, 12V/24V/48V battery-backed server and storage hot swap, RAID / disk-array plug-in cards, and ATCA / AdvancedTCA payload boards. Designers choose the LM5069 family for its combination of wide operating voltage, power limiting during startup transients, and industry-standard 10-pin VSSOP footprint. When designing with this part, select the external RSENSE to set the circuit-breaker threshold and the GATE dV/dt capacitor to control inrush current. The TIMER capacitor value sets the fault integration window: too short can nuisance-trip on benign transients, too long can allow sustained overcurrent. Always verify SOA of the external pass MOSFET under worst-case hot-plug at minimum VIN. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, including cross-brand pin-compatibility notes for Analog Devices and Maxim Integrated parts.
LM5069MM-2/NOPB - 80V Hot Swap Controller w/ Power Limit | TI
The Texas Instruments LM5069MM-2/NOPB is a positive high-voltage hot-swap / inrush current controller with power limiting, operating across a 9V to 80V input range and packaged in a 10-pin VSSOP (DGS). The -2 suffix designates auto-restart fault behavior after a fault detection, while the -1 sibling latches off instead, both sharing the same die and footprint. What is a hot-swap controller? A hot-swap controller is a power-management IC that allows a circuit board to be inserted into a live backplane without drawing inrush currents large enough to damage connectors, blow fuses, or collapse the upstream rail. It drives an external N-channel MOSFET in the high-side path and combines programmable inrush current limiting, power limiting, undervoltage/overvoltage lockout, and a fault timer. Hot-swap controllers belong to the wider power-management hierarchy: hot-swap controller -> hot-swap & power distribution -> power management IC -> semiconductor. Key features include programmable current limit set by an external sense resistor, a 0.7-ms internal fault timer that distinguishes inrush from sustained fault, independent OV/UV thresholds with hysteresis, a power-good indicator, and a board-insertion delay. The DGS VSSOP package occupies roughly the same board area as a 10-pin MSOP while providing enhanced thermal performance for the dissipation levels encountered in -48V telecom and 24V industrial rails. The device uses a transconductance control loop with a dv/dt circuit on GATE, charging the MOSFET gate with a programmable current source to ensure monotonic rail ramp. Power limiting is implemented by measuring the voltage across the sense resistor multiplied by VIN, giving a true input-power limit rather than a simple current foldback, which protects the upstream supply during capacitive or short-circuit events. The LM5069-2 auto-restart behavior retries every 220 ms (typical) after a fault, ideal for transient overload recovery. Typical applications include -48V telecom plug-in cards, 24V/48V industrial automation modules, blade servers and ATCA front-end boards, battery exchange modules in UPS systems, and PoE midspan power insertion. The wide 80V input range also tolerates load-dump transients on 24V automotive and heavy-industrial buses. A design consideration worth highlighting: the LM5069MM-2/NOPB differs from the LM5069MM-1 by auto-restart rather than latch-off after faults. Selection should reflect whether the system requires operator intervention (latch) or unattended recovery (auto-restart). PCB layout should keep the sense-resistor trace short and Kelvin-connected to the CS pin to avoid ground bounce from corrupting the current measurement. This page synthesizes distributor pricing, drop-in pin-compatible alternatives, and practical design notes not found in the manufacturer datasheet alone, including a head-to-head comparison with the LM5069MM-1 and TPS2490DGS in the same VSSOP-10 footprint.
LM5070MTC-50 - PoE PD Interface & PWM Controller | TI
The Texas Instruments LM5070MTC-50 is an integrated Power over Ethernet (PoE) Powered Device (PD) interface and current-mode PWM controller with an 80V, 400mA internal line connection switch, a 580 kHz oscillator, a 6.25V UVLO threshold, and a 16-pin TSSOP package rated from -40C to +125C. A PoE PD interface controller is the front-end circuit that lets a networked device safely draw power over the Ethernet cable itself. Within the power management hierarchy, it sits between the Ethernet port and the isolated DC-DC converter, performing classification, inrush limiting, and undervoltage lockout before handing a regulated bus to the switching stage. The LM5070 integrates this interface and the PWM modulator on one die, eliminating discrete PD interface ICs. Key features include full IEEE 802.3af compliance with integrated detection, classification, and inrush current control; an integrated 80V, 400mA pass switch that handles the line-connection sequencing; and a full-featured current-mode PWM controller supporting flyback and other isolated topologies for converting the 48V PoE input rail to system voltages. Technically, the device combines the PD interface state machine with a current-mode PWM engine operating at a nominal 580 kHz, allowing compact transformer designs. The 80V switch rating provides ample margin above the 48V nominal PoE voltage, including transient headroom, and the adjustable UVLO threshold (6.25V reference for the -50 variant) enables precise power-good detection. Typical applications include IP security cameras, VoIP phones, wireless access points, and any IEEE 802.3af-powered network endpoint needing an integrated PD front end plus converter control. Design consideration: verify the UVLO setting and external N-channel MOSFET sizing for the downstream converter, since the PWM controller drives an external power stage; thermal and inrush behavior should be validated at maximum cable length where series resistance is highest. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
LM5070MTC-80/NOPB - PoE PD Controller 80V TSSOP-16 | TI
The Texas Instruments LM5070MTC-80/NOPB is an integrated Power over Ethernet (PoE) Powered Device (PD) interface and PWM controller that combines an 80 V, 400 mA line connection switch with a full-featured current mode PWM controller in a 16-pin TSSOP (PW) package, supporting supply operation from 1.8 V to 75 V and up to 13 W of classified PoE power per IEEE 802.3af. A PoE PD controller is the interface IC that sits between the Ethernet cable's powered line and the downstream DC-DC converter of a powered device such as an IP camera, wireless access point, or VoIP phone. Within the power-management IC hierarchy, it belongs to the PoE controller family (power interface controllers), which handles detection, classification, and inrush control before handing power to the converter stage. The IEEE 802.3af standard defines the detection signature, classification currents, and under_voltage lockout thresholds that such a device must meet. Key features include the integrated 80 V, 400 mA pass switch with controlled inrush limiting, fully IEEE 802.3af compliant detection and classification, a current mode PWM stage with up to 1 MHz maximum switching frequency, 80% maximum duty cycle, and adjustable under-voltage lockout. Integration of the PD front end and PWM controller in one package reduces board area, external component count, and overall system bill-of-materials cost. Architecturally, the LM5070 pairs the PoE line-interface section (signature resistor, classification, inrush, and thermal protection) with a current mode PWM controller suited to flyback or buck-derived isolated and non-isolated topologies. The 80 V rated internal switch covers the transient environment of long Ethernet runs, while the PWM section provides cycle-by-cycle current limiting and programmable oscillator frequency up to 1 MHz for compact magnetics. Typical applications include IEEE 802.3af powered IP security cameras, 802.11 wireless access points, VoIP telephones, network-attached access control terminals, and any PoE-powered endpoint converting 48 V Ethernet power into system rails. Design consideration: because the internal connection switch is rated 80 V and 400 mA, ensure inrush energy and load capacitance stay within the datasheet limits and keep the converter duty cycle below the 80% maximum to avoid runaway in flyback designs. This page adds value beyond the datasheet by synthesizing distributor availability data, verified drop-in alternative analysis, and practical design notes for the LM5070MTC-80/NOPB in one reference.
LM5085QMYE/ - 75V PFET Buck Controller | Texas Instruments
Texas Instruments LM5085QMYE/ is a high-voltage constant-on-time PFET buck switching controller with a 4.5 V to 75 V input range, switching frequency programmable up to 1 MHz, and an 8-HVSSOP exposed-pad package. The automotive-qualified LM5085-Q1 variant is AEC-Q100 Grade 1 qualified for operation from -40°C to 125°C junction temperature. This controller is designed to simplify high-efficiency step-down regulator development using an external PFET, inductor, and feedback network. A buck switching controller is a type of DC-DC converter controller that drives an external switching element to reduce a higher input voltage to a regulated lower voltage. The LM5085 belongs to the power-management hierarchy: buck regulator controller, DC-DC switching controller, and power-management IC. Its PFET gate driver and constant-on-time control principle enable high-voltage operation without the complexity of an actively driven high-side N-channel MOSFET. Key features include a wide 4.5 V to 75 V operating input range, 100% maximum duty-cycle capability, adjustable current limiting using either the PFET RDS(ON) or a current-sense resistor, and cycle-by-cycle current limiting. The controller includes a built-in high-voltage bias regulator and PFET gate driver. According to the Texas Instruments LM5085 product information, the device offers nearly constant operating frequency with line and load variation. The constant-on-time architecture avoids loop compensation and is intended to provide an ultrafast transient response. Switching frequency can be programmed up to 1 MHz, allowing designers to select between smaller magnetics, higher switching rates, or lower switching losses. The PFET drive arrangement supports simplified gate-drive requirements and extends regulation range through 100% duty-cycle operation at low input voltage. Typical applications include industrial 24 V or 48 V bus step-down supplies, automotive electrical-control units, telecom and networking equipment, test and measurement instruments, and high-voltage battery-derived power rails. The controller operates with external power components, so final output current, efficiency, ripple, and thermal performance depend on the selected PFET, inductor, capacitors, and PCB layout. For robust implementation, place the controller and high-current switching loop tightly, maintain a compact high-dv/dt gate-drive path, use adequate input and output capacitance, and verify current-limit behavior across VIN, load, and temperature. This page combines manufacturer information, distributor availability, application guidance, and design-focused considerations for engineers evaluating the LM5085-Q1 family.
LM5085QMYE/NOPB - 75V PFET Buck Controller, AEC-Q100 | TI
The Texas Instruments LM5085QMYE/NOPB is a 4.5V to 75V wide-input, constant on-time (COT), non-synchronous PFET buck (step-down) DC-DC switching controller in an 8-pin HVSSOP (DGN) exposed-pad package, qualified to AEC-Q100 Grade 1 for automotive applications. The part is specified for junction temperatures from -40°C to +125°C, and uses the constant on-time control principle to deliver ultra-fast transient response with no loop compensation required. The PFET topology enables 100% duty cycle operation, extending regulation headroom at low input voltages. What is a buck controller? A buck controller is a type of DC-DC switching controller that, paired with an external power MOSFET and inductor, steps a higher DC input voltage down to a lower regulated output voltage. Within the power management IC hierarchy, it sits above simple LDOs and below fully integrated point-of-load (POL) converters: LDO -> buck controller -> DC-DC converter -> power management IC. The COT (constant on-time) variant eliminates the traditional error amplifier and PWM modulator, instead using a one-shot on-timer that produces a nearly constant switching frequency across line and load variations. Key features include a wide 4.5V to 75V operating input range, adjustable current limit using either the external PFET's RDS(on) or a dedicated current-sense resistor, programmable switching frequency up to 1 MHz, cycle-by-cycle overcurrent protection, and a built-in LDO regulator that powers internal circuitry. The device also provides an enable pin for power sequencing and an internal 7V gate-drive clamp that protects the external PFET. The HVSSOP-8 exposed-pad package provides a low thermal resistance path to the PCB copper pour. Architecturally, the LM5085 uses an adaptive on-timer whose pulse width is set by an external resistor (RTON) and inversely proportional to VIN, producing a near-constant frequency across the input range. This approach yields a feed-forward control loop that is inherently stable without compensation components, dramatically simplifying design-in compared to traditional voltage-mode or peak-current-mode controllers. The current-limit comparator monitors the voltage across the external PFET or a sense resistor on every cycle and terminates the on-pulse to protect the converter from short-circuit and overload events. Typical applications include automotive infotainment and instrument-cluster rails, 24V industrial sensor supplies, point-of-load conversion from 48V telecom rails, LED driver front-ends, and battery-powered systems requiring high step-down ratios. The wide Vin and 100% duty cycle operation also make the part well suited to cold-crank and load-dump scenarios in 12V/24V automotive electrical systems. When designing with the LM5085, choose the external PFET's VDS rating to comfortably exceed maximum VIN plus margin (typically 100V for a 75V nominal design), and size the current-sense resistor to trip at no more than 120% of the design load. The exposed pad must be soldered to a sufficiently large copper pour to keep the junction within its 125°C rating at full power. This page synthesizes verified distributor pricing, pin-compatible drop-in alternatives (same-brand and cross-brand), and practical design notes that are not available in the manufacturer datasheet alone.
LM5117MHX/NOPB - 5.5-65V Sync Buck Controller | TI
The Texas Instruments LM5117MHX/NOPB is a wide input range synchronous buck controller designed for step-down regulator applications from high voltage or widely varying input supplies. It operates from an input voltage range of 5.5V to 65V, making it suitable for industrial, automotive, and telecom power systems. The device is housed in a 20-pin HTSSOP (PWP) package with an exposed thermal pad, enabling efficient heat dissipation in compact designs. A synchronous buck controller is a type of DC-DC switching regulator that uses external MOSFETs to step down a higher input voltage to a lower output voltage with high efficiency. Unlike linear regulators, buck controllers achieve efficiency often above 90% by switching power devices rather than dissipating excess energy as heat. The LM5117 employs current mode control with an emulated current ramp, providing inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. This control method ensures stable operation across a wide range of input voltages and load conditions. Key features of the LM5117 include an analog current monitor output, which allows precise monitoring of the output current for system protection and telemetry. The device also features a wide 5.5V to 65V input range, programmable output voltage, and a switching frequency that can be set from 50kHz to 750kHz via an external resistor. The controller supports both high-side and low-side external N-channel MOSFETs, enabling designs with high efficiency and flexible power stage configurations. Technically, the LM5117 integrates a high-voltage startup regulator, a precision 1.5V reference, and a robust gate drive capability. The emulated current ramp eliminates the need for a sense resistor in the high-current path, reducing power loss and improving efficiency. The device also includes features such as soft-start, hiccup mode overcurrent protection, and thermal shutdown, enhancing system reliability. Typical applications include industrial power supplies, automotive infotainment and body electronics, telecom and networking equipment, and general-purpose step-down converters. The wide input range and high efficiency make it ideal for systems that must operate from 12V, 24V, or 48V rails with varying input transients. When designing with the LM5117, ensure proper PCB layout with short, low-inductance paths for the high-current switching loops. The exposed pad must be soldered to a copper area for adequate thermal performance. Additionally, select the external MOSFETs and output inductor based on the required output current and efficiency targets.
LM5117PMH/NOPB - 5.5-65V Sync Buck Controller | Texas Instruments
The Texas Instruments LM5117PMH/NOPB is a wide input range, current mode synchronous buck controller designed for step-down regulator applications from high voltage or widely varying input supplies. It operates from an input voltage range of 5.5V to 65V and provides a single output with a duty cycle up to 95%, housed in a 20-pin HTSSOP (PWP) package with an exposed pad for enhanced thermal performance. A synchronous buck controller is a type of DC-DC switching regulator within the broader power management IC family that uses external MOSFETs to achieve high efficiency by replacing the freewheeling diode with a low-side switch. This architecture reduces conduction losses and improves efficiency, especially at high output currents. The LM5117PMH/NOPB employs emulated peak current-mode control, providing inherent line feed-forward, cycle-by-cycle current limiting, and ease of loop compensation. Key features include the wide 5.5V to 65V input range, an analog current monitor output for system telemetry, programmable switching frequency up to 530kHz, and 3.3A peak gate drive strength for high-side and low-side external MOSFETs. The device also offers a precision 1.5% voltage reference with output programmable from 0.8V, adaptive dead-time control, optional diode emulation mode, an enable pin for power sequencing, and thermal shutdown protection. The emulated current-mode control architecture senses the low-side MOSFET current via an external sense resistor, delivering excellent line and load transient response while simplifying compensation network design compared to voltage-mode controllers. Robust gate drivers with adaptive dead-time minimize switching losses in the external power stage, and diode emulation improves light-load efficiency. Typical applications include industrial power supplies, automotive infotainment and body electronics, telecom and networking equipment, and high-voltage battery-powered systems. The wide input range suits 12V, 24V, and 48V bus systems as well as automotive load-dump conditions. TI reference design PMP20808 demonstrates 25V output at 18A from a 38V nominal input. When designing with this controller, keep gate drive paths short and place the bootstrap capacitor close to the IC; locate the current sense resistor at the low-side MOSFET source for accurate sensing. Program the switching frequency with an external resistor to optimize the efficiency-versus-size trade-off.
LM5117QMHX/NOPBQ1 - 65V Sync Buck Controller AEC-Q100 | TI
The Texas Instruments LM5117QMHX/NOPB is an automotive-grade (AEC-Q100 Grade 1) wide-input synchronous buck controller designed for step-down regulation from high-voltage or widely varying input supplies of 5.5V to 65V. It comes in a 20-pin HTSSOP package with exposed thermal pad and requires no additional drivers thanks to integrated 3.3A peak gate drives for both high-side and low-side MOSFETs. A synchronous buck controller is a pulse-width-modulated power management IC that drives external MOSFETs to convert a higher input voltage to a lower output voltage with high efficiency. Unlike a buck converter with integrated switches, a controller allows designers to scale output current and voltage with their choice of external MOSFETs and inductors, making it the preferred choice in the power-conversion hierarchy for high-power, high-reliability systems. Key features include emulated peak current-mode control, which provides inherent line feed-forward, cycle-by-cycle current limiting, and simplified loop compensation. The controller supports free-run operation or external synchronization up to 750 kHz, with adaptive dead-time control to minimize body-diode conduction losses. An optional diode emulation mode improves light-load efficiency, and an analog current monitor (CM pin) provides a voltage proportional to load current for system telemetry. The LM5117-Q1 architecture uses an emulated control ramp that eliminates the need for slope compensation over most operating ranges, and it tolerates very small duty cycles - useful when converting 48V automotive or 24V industrial buses down to low voltages. Robust 3.3A gate drivers allow large FETs for currents well beyond 10A depending on external components. Typical applications include automotive infotainment and ADAS power rails (48V/24V-to-5V/3.3V), 24V industrial automation supplies, telecom intermediate bus converters, and USB-C PD adapters. The AEC-Q100 qualification makes it particularly suited to engine-bay-adjacent modules. Design consideration: layout is critical - keep the HO/LO gate loops short and place the current-sense traces as a Kelvin pair across the sense element to realize the accuracy of the analog current monitor.
LM5146 - 100V Synchronous Buck DC/DC Controller | Texas Instruments
The Texas Instruments LM5146 is a 100-V synchronous buck DC/DC controller with a wide duty-cycle range, designed for high-performance industrial controls, datacom, robotics, and RF applications. It operates from an input voltage range of 5.5 V to 100 V, regulates outputs down to ground, and continues to operate during input voltage dips as low as 5.5 V at nearly 100% duty cycle, making it ideal for high-input-voltage industrial systems with large transient swings. A synchronous buck controller is a type of DC-DC switching regulator that uses external MOSFETs to step down a higher input voltage to a lower regulated output voltage. Within the broader power management hierarchy, it sits above LDO regulators on the conversion efficiency vs. noise trade-off curve: synchronous buck controllers achieve 90-95% efficiency at high VIN/VOUT ratios, while LDOs trade efficiency for ultra-low output noise. The LM256 belongs to the voltage regulator -> power management IC -> semiconductor taxonomy. Key features include a 100-V rated bootstrap gate driver, dual-channel random spread spectrum for EMI mitigation, ultra-low quiescent current in standby, and SYNCIN/SYNCOUT pins for frequency synchronization. The integrated high-side and low-side gate drivers feature low impedance to drive large die-size or paralleled MOSFETs with correspondingly large gate charge (QG), enabling multi-amp output current capability. The LM5146 architecture uses peak current-mode control with an internal 0.8 V reference, internal slope compensation, and adjustable switching frequency up to 1 MHz. The wide duty-cycle capability allows the converter to maintain regulation through severe input transients, such as automotive cold-crank or industrial load-dump events. Synchronous rectification eliminates the lossy external Schottky diode, improving thermal behavior at full load. Typical applications include 48-V telecom point-of-load converters, industrial PLC and motor-control auxiliary rails, battery-powered robotics with 24-72 V battery stacks, and high-voltage LED driver front ends. The wide input range also supports solar MPPT charge controllers and e-mobility auxiliary supplies. The 20-pin VQFN (4.5x3.5 mm) package (RGY) is optimized for compact designs. When designing with the LM5146, select the external MOSFETs based on the maximum input voltage (100 V drain-source rating with adequate margin) and the desired output current. Use the WEBENCH Power Designer tool to size the inductor and capacitors, and follow the layout recommendations in the datasheet for the BOOT, SW, and VIN traces to minimize parasitic inductance. The SYNCIN pin should be tied to GND if unused.
LM5155DSSR - 2.2MHz Wide Vin 1.5A Boost/SEPIC/Flyback Controller | Texas Instruments
The Texas Instruments LM5155DSSR is a 2.2-MHz wide-Vin non-synchronous boost/SEPIC/flyback DC-DC controller delivering a 1.5-A MOSFET gate driver in a 12-pin WSON (DSS, 3x2 mm) package with thermal pad. It supports input voltages from 1.5 V (with BIAS supplied) up to 45 V, and regulates output voltages up to 50 V. The switching frequency is programmable from 100 kHz to 2.2 MHz via an external RT resistor. What is a boost controller? A boost (step-up) controller is a type of switching DC-DC controller that maintains a constant output voltage higher than its input voltage by cycling an external power MOSFET through an inductor-capacitor energy-transfer network. The LM5155 family belongs to the broader hierarchy: boost controller -> DC-DC switching controller -> power management IC -> semiconductor. Its peak-current-mode control simplifies loop compensation and provides cycle-by-cycle current limiting, making it preferable to voltage-mode control for low-ESR ceramic output caps. Key features include a 1.5-A peak gate-drive output capable of driving large high-side MOSFETs at high dV/dt, an ultra-wide input range from 2.97 V (cold-crank survival) up to 45 V, programmable peak current limit, internal 3-ms soft start, PGOOD output for sequencing, and selectable spread-spectrum or external synchronization. The 12-pin WSON-EP provides low profile and excellent thermal performance. The LM5155 uses peak current mode control with internal slope compensation to support both boost and SEPIC topologies across the full duty-cycle range. Its 1.5-A gate driver enables operation at up to 2.2 MHz with minimal switching-node transition losses, which is essential for compact designs using small L-C filtering. An external VCC LDO output powers the gate driver from the boosted output, reducing input-current draw at high duty cycles. Typical applications include automotive pre-boost supplies for audio amplifiers running through cold-crank transients, industrial 24-V to 48-V boost converters, SEPIC-isolated supplies for RS-485/RS-232 transceivers, and flyback auxiliary rails in multi-output SMPS designs. The wide input range suits battery-powered systems that experience large voltage transients. When designing with the LM5155, ensure the BIAS pin is supplied by at least 3 V for startup from a 1-cell battery. Choose an RT resistor carefully to avoid subharmonic instability; the RT resistor also sets the maximum duty-cycle clamp. Use a Schottky rectifier in continuous-conduction boost topology to maximize efficiency.
LM5163QDDARQ1 - 100V 0.5A Sync Buck DC/DC Converter | TI
The Texas Instruments LM5163QDDARQ1 is an automotive-grade, 6-V to 100-V input, 0.5-A synchronous buck DC/DC converter with ultra-low quiescent current, packaged in an 8-pin SO PowerPAD (DDA). It integrates high-side and low-side MOSFETs to deliver up to 0.5A of continuous output current with adjustable output from 1.2V up to 90V. The -Q1 suffix denotes AEC-Q100 grade 1 automotive qualification for harsh environment operation. Background: A buck (step-down) DC/DC converter is a switching voltage regulator which uses an inductor and capacitive output filter to convert a higher DC input voltage into a lower, regulated DC output. The synchronous topology replaces the traditional rectifier diode with a low-side MOSFET, dramatically improving efficiency at light loads. The LM5163-Q1 belongs to the category hierarchy: synchronous buck converter -> step-down DC/DC regulator -> switching voltage regulator -> power management IC -> semiconductor. Key features include an ultra-low IQ of 10.5 µA typical (no-load), a minimum controllable on-time of 50 ns that enables direct step-down from a 48V nominal rail to low-voltage point-of-load rails, and a switching frequency range of 75 kHz to 1 MHz programmable via RT pin. The device also integrates open-drain PGOOD indicator for output voltage monitoring and sequencing, fixed 2-ms or externally-programmable soft-start, and cycle-by-cycle overcurrent protection. The 8-pin SO PowerPAD package with 1.27 mm pin pitch provides adequate creepage for high-voltage applications. Architecturally, the LM5163-Q1 uses peak current-mode control with internal compensation, eliminating the need for an external compensation network. The wide VIN range minimizes external surge suppression components, simplifying 48V automotive and industrial designs. According to TI's product page, the part is qualified to AEC-Q100 grade 1 and is available in the 8-pin SO PowerPAD package. Typical applications include automotive 48V mild-hybrid systems, industrial 24V/36V/48V sensor and actuator rails, body electronics and lighting, battery-powered equipment with high-voltage transient protection, and isolated point-of-load regulation. The wide VIN tolerance allows direct connection to unregulated rectified AC or high-voltage DC bus without extensive protection circuitry. When designing, drop the inductor selection on the output short-circuit protection rating of the upstream supply - the LM5163-Q1 can withstand 100V transients. Use a 1% tolerance resistor divider at the FB pin to maintain output voltage accuracy and place the BOOT capacitor as close as possible to the BOOT and SW pins. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
LM5164DDAR - 100V 1A Sync Buck Converter | Texas Instruments
The Texas Instruments LM5164DDAR is a 100-V input, 1-A synchronous buck DC/DC converter with ultra-low quiescent current, designed for high-voltage industrial and automotive power systems. It operates from a 6-V to 100-V input range and provides an adjustable output voltage down to 1.2 V, delivering up to 1 A of continuous output current in an 8-pin SO PowerPAD (HSOIC-8) package. A synchronous buck converter is a type of DC-DC step-down regulator in the power management IC hierarchy that uses two active switches instead of a diode to achieve higher efficiency, especially at low output voltages. The LM5164 integrates both high-side and low-side MOSFETs, simplifying design and reducing external component count. Key features include an ultra-low quiescent current that extends battery life in always-on systems, and a wide input range that eliminates external surge suppression components. An open-drain PGOOD indicator supports power sequencing, fault reporting, and output voltage monitoring. The 1 MHz switching frequency allows small external inductors and capacitors, and the device supports 100% duty cycle for low dropout operation. The LM5164 uses peak current-mode control with internal compensation, providing fast transient response and stable operation over a wide range of output capacitors. Integrated low-RDS(on) MOSFETs minimize conduction losses. Cycle-by-cycle current limiting, thermal shutdown, and hiccup-mode short-circuit protection ensure robust operation in harsh environments. Typical applications include industrial 24-V and 48-V bus power supplies, 12-V automotive body electronics, motor drives, battery management systems, and always-on telematics. The ultra-low IQ makes it ideal for remote monitoring systems that spend most of their life in standby. Design tip: provide a solid ground plane and adequate copper area under the PowerPAD for thermal dissipation, and maintain sufficient creepage distance between high-voltage and low-voltage traces given the 1.27-mm pin pitch.
LM5164QDDAR - 100V Input 1A Sync Buck Converter | TI
The Texas Instruments LM5164QDDAR is a 6-V to 100-V input, 1-A synchronous step-down (buck) DC-DC converter with ultra-low quiescent current, delivered in an 8-pin SO PowerPAD (HSOIC/DDA, 3.90 mm width) surface-mount package. It regulates an adjustable output down to 1.2V and is qualified to AEC-Q100 Grade 1 in its Q1 variant, targeting 48-V automotive and industrial rails. A synchronous buck converter is a switched-mode power supply topology that uses an internal high-side and low-side MOSFET pair instead of a clamp diode, reducing conduction losses and improving efficiency compared to nonsynchronous designs. Within the power-management hierarchy, it sits between unregulated wide-range sources (48-V automotive batteries, industrial 24/48-V buses, rectified mains) and point-of-load regulators or LDOs that require tight, low-voltage inputs. Key features of the LM5164 include a minimum controllable on-time of just 50 ns, which enables very large step-down conversion ratios such as direct 48 V to low-voltage rail conversion without intermediate stages. A fixed 3.5-ms internal soft-start timer controls inrush current, peak current-limit protection guards against short-circuit faults, and an open-drain PGOOD output supports power sequencing and fault reporting. Technically, the LM5164-Q1 employs peak current-mode control with an internally set switching frequency (approximately 1 MHz per distributor parametrics). The 1.27-mm pin pitch of the SO PowerPAD package provides adequate creepage and clearance spacing for high-voltage applications, while the exposed PowerPAD thermal pad must be soldered to a PCB copper area for heat dissipation. The junction temperature range of -40C to +125C (operation up to +150C per LCSC parametrics) supports underhood and industrial environments. Typical applications include 48-V automotive battery input systems (mild-hybrid, EV auxiliary rails), industrial 24-V/48-V PLC and motor-drive auxiliary supplies, and telecom or server rack power-tree front ends where a wide input range minimizes external surge-suppression components. Design consideration: because the converter integrates high-voltage FETs, careful PCB layout is essential; the SW node, input decoupling loop, and PowerPAD thermal connection dominate both EMI performance and thermal margin, so follow the datasheet layout section precisely. This page adds information gain beyond the datasheet by synthesizing distributor pricing as of 2026-09-01, verified drop-in alternatives, engineering design notes, and an AEO-optimized FAQ for the LM5164QDDAR.
LM5164QDDARQ1 - 100V 1A Sync Buck Regulator | Texas Instruments
The Texas Instruments LM5164QDDARQ1 is an AEC-Q100 Grade 1 qualified, 6-V to 100-V input, 1-A synchronous DC-DC buck converter with ultra-low quiescent current, packaged in an 8-pin SO PowerPAD (DDA, 3.90mm width) surface-mount package with 1.27mm pin pitch for high-voltage reliability. A synchronous buck converter (also called a step-down switching regulator) is a DC-DC power conversion IC that uses internal high-side and low-side MOSFETs to efficiently reduce a higher input voltage to a lower regulated output. Within the power management hierarchy, it sits as a switching regulator under voltage regulators and power management ICs, offering far higher efficiency than linear regulators (LDOs) at large step-down ratios. Key features include the wide 6V to 100V input range, which minimizes the need for external surge-suppression components in 24V, 48V, and automotive battery systems; a minimum controllable on-time of just 50ns, enabling large step-down conversion ratios such as direct 48V-to-low-voltage conversion; and a fixed 3.5ms internal soft-start timer with peak current-limit protection for controlled startup and fault robustness. The -40C to +125C junction temperature range supports harsh automotive and industrial environments. Technically, the LM5164-Q1 regulates a positive adjustable output down to 1.2V and operates with ultra-low standby current for high light-load efficiency. An open-drain PGOOD indicator supports power sequencing, fault reporting, and output voltage monitoring. The 8-pin SO PowerPAD exposed-pad package provides low thermal resistance when soldered to a PCB copper plane, enabling 1A continuous output without an external heatsink. Typical applications include automotive 48V and 12V battery rail point-of-load conversion, industrial 24V bus power supplies, and auxiliary bias rails for isolated converters, gate drivers, and microcontrollers such as C2000 devices. The wide input range directly absorbs load-dump transients, reducing system cost. Design consideration: maintain adequate PCB copper area under the PowerPAD for thermal dissipation, and verify the minimum on-time budget when stepping down from 100V inputs to sub-5V outputs to preserve regulation stability. Pricing references are as of 2026-08-29.
LM5164QDDATQ1 - 100V 1A Sync Buck Converter | Texas Instruments
The Texas Instruments LM5164QDDATQ1 is a 6-V to 100-V input, 1-A synchronous DC-DC buck converter with ultra-low quiescent current, housed in an 8-pin SO PowerPAD (DDA) package with 1.27mm pin pitch for adequate high-voltage spacing. It regulates a wide input range down to an adjustable output from 1.2 V to 90 V at up to 1 A continuous load, making it ideal for direct step-down from 48-V nominal rails to low-voltage system rails. A buck (step-down) DC-DC converter is a switched-mode power supply topology that uses an internal MOSFET switch, an external inductor, and a control loop to convert a higher DC input voltage into a lower regulated DC output voltage with high efficiency. Synchronous buck converters integrate both high-side and low-side FETs, replacing the external Schottky diode with a low-Rds(on) MOSFET to reduce conduction losses and improve efficiency at light loads. The LM5164-Q1 belongs to the converter (DC-DC switching regulator) -> power management IC -> semiconductor hierarchy. Key differentiating specifications include 10 uA typical quiescent current (ultra-low IQ for always-on applications), 50 ns minimum controllable on-time enabling large step-down ratios, peak-current-mode control, and a wide 75 kHz to 1 MHz adjustable switching-frequency range. The device includes internal loop compensation, integrated 100-V boot FET, spread-spectrum option for EMI mitigation, and automotive AEC-Q100 Grade 1 qualification. Architecturally, the LM5164-Q1 employs constant on-time (COT) variation with adaptive frequency control and internal compensation, simplifying external component selection and removing the need for an external compensation network. The high-side and low-side N-channel MOSFETs are integrated, and a precision enable/UVLO threshold plus power-good flag support sequencing in multi-rail systems. Typical applications include 48-V telecom point-of-load regulation, automotive ECU and body-electronics power, industrial 24-V/36-V/48-V sensor and actuator supplies, battery management system auxiliary rails, and HVAC motor-driver low-voltage rails. The wide VIN range eliminates the need for external surge suppression components typically required for 24-V and 48-V industrial buses. When designing, ensure the boot capacitor and input/output capacitors are placed close to the IC pins, and use a 1.27mm-pitch PCB layout to maintain clearance for 100-V transients. The device requires only an inductor, input/output capacitors, and feedback resistors for a complete solution. This page synthesizes distributor pricing, AEC-Q100 alternative listings, and practical design notes not found in the manufacturer datasheet alone, providing drop-in cross-references for both automotive and non-automotive variants of the same die.
LM5166YDRCR - 3V-65V 500mA Sync Buck Converter | Texas Instruments
The Texas Instruments LM5166YDRCR is a 3-V to 65-V input, 500-mA synchronous buck converter with ultra-low IQ, delivered in a 10-pin VSON (DRC) package with 0.5-mm pin pitch. The device integrates both high-side and low-side power MOSFETs, supports fixed 3.3-V or 5-V output versions, and offers an adjustable output option. The fixed-3.3V Y variant in DRC package provides a complete DC-DC solution in a footprint of approximately 3 mm × 3 mm, making it one of the most compact high-voltage synchronous buck converters in its class. What is a synchronous buck converter? A buck converter is a switched-mode DC-DC topology that steps a higher input voltage down to a lower regulated output voltage. The "synchronous" designation indicates that the traditional freewheeling rectifier diode is replaced by a second MOSFET (low-side switch), which is actively switched to improve efficiency, especially at light loads. Synchronous buck converters occupy a sub-category of the broader DC-DC converters and switch-mode power supplies (SMPS) family. They are widely used as point-of-load (POL) regulators in industrial, automotive, and battery-powered systems where efficiency and thermal performance matter more than absolute cost. The LM5166YDRCR's key differentiators include its 3-V to 65-V ultra-wide input range, sub-10 µA quiescent current for battery-friendly standby, fixed 3.3-V output eliminating external feedback resistors, and an open-drain PGOOD indicator for power-rail sequencing and fault reporting. Internal compensation simplifies the design to a handful of external passive components, while COT (constant on-time) control provides fast transient response without requiring a loop-compensation network. Architecturally, the LM5166 employs peak-current-mode control with adaptive constant on-time, allowing the converter to respond within one switching cycle to load steps while maintaining stability across the entire VIN range. The integrated 65-V high-side and low-side MOSFETs eliminate external switching components, reducing BOM count to roughly 10 parts. Typical applications include industrial 24-V and 48-V sensor rails, building automation, battery-powered IoT endpoints, e-metering, and low-power standby rails in PLCs. The ultra-low IQ is particularly valuable in always-on systems that must spend most of their life in sleep mode. When laying out this part, place the bootstrap capacitor (CBT) and VCC bypass capacitor directly at their respective pins, keep the input loop (CIN to SW to PGND) tight to minimize ringing, and use a solid PGND copper pour under the exposed pad for thermal relief. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on individual manufacturer or distributor pages, providing a single reference for engineers comparing the LM5166YDRCR to competing wide-VIN synchronous buck converters.
LM5176 - 55V Wide VIN 4-Switch Buck-Boost Controller | TI
The Texas Instruments LM5176 is a synchronous four-switch buck-boost DC/DC controller that regulates output voltage at, above, or below the input voltage. It operates over a wide input voltage range of 4.2 V to 55 V (60-V absolute maximum), making it suitable for a variety of applications including automotive, industrial, and power supply designs. The controller integrates four N-channel MOSFET drivers, eliminating the need for external drivers or floating bias supplies. A buck-boost controller is a type of switching regulator that can step up or step down an input voltage to produce a regulated output. Unlike a buck or boost converter alone, a four-switch buck-boost topology uses four switches (two high-side and two low-side) to achieve seamless transition between buck and boost modes, maintaining regulation across a wide input range. This makes it ideal for battery-powered systems where the input voltage can vary above and below the desired output. Key features of the LM5176 include a wide input voltage range, integrated high-side and low-side drivers, programmable switching frequency, and comprehensive protection features such as overvoltage protection (OVP) and undervoltage lockout (UVLO). The device also supports constant current regulation with an external sense resistor, enabling applications like LED drivers and battery chargers. The LM5176 uses a current-mode control architecture with a precision reference, providing excellent line and load regulation. The integrated VCC regulator powers the internal bias rails and gate drivers, simplifying the design. The device is available in a 28-pin HTSSOP package (PWPR), which offers good thermal performance for high-power applications. Typical applications include USB Power Delivery (PD) adapters, automotive infotainment systems, industrial power supplies, and battery-powered equipment. The wide input range and high efficiency make it a versatile choice for designs requiring a regulated output from varying input sources. When designing with the LM5176, ensure proper PCB layout with adequate copper area for thermal dissipation, and place the input and output capacitors close to the IC. The switching frequency can be programmed with an external resistor, allowing optimization between efficiency and component size.
LM5176QPWPRQ1 - 55V 4-Switch Buck-Boost Controller | TI
The Texas Instruments LM5176QPWPRQ1 is an AEC-Q100 qualified synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. It operates from a 4.2 V to 55 V input (60 V absolute maximum) with a programmable switching frequency of 100 kHz to 600 kHz, in a 28-pin HTSSOP (PWP) package with PowerPAD. A buck-boost controller is a type of switching regulator that steps voltage up or down as needed. The four-switch buck-boost topology uses four external MOSFETs to transition seamlessly between buck and boost operation, making it ideal where input voltage varies above and below the output, as in automotive 12 V buses during cranking and load-dump. In the power management hierarchy: buck-boost controller -> DC-DC controller -> switching regulator -> power management IC. Key features include current-mode control in both buck and boost modes for superior load and line regulation, integrated cycle-by-cycle current limiting, output overvoltage protection, thermal shutdown, and PWM/PFM operation for improved light-load efficiency. AEC-Q100 qualification with -40C to +125C ambient operation (junction up to +150C) targets harsh automotive environments. Architecturally, the LM5176-Q1 drives external N-channel MOSFETs, allowing designers to scale output power freely. The proprietary current-mode scheme simplifies loop compensation and delivers fast transient response, while the four-switch topology maintains high efficiency across wide input-to-output ratios. Typical applications include automotive USB power delivery, battery-backup and holdup power supplies, industrial 12 V/24 V bus systems, LED drivers, and renewable energy interfaces. Its transient immunity keeps output regulation during automotive input disturbances. Design with care: keep MOSFET gate-drive loops short, place high-frequency decoupling close to the IC, and select the switching frequency to balance efficiency versus component size. Tune the compensation network for stable operation across buck, boost, and buck-boost transition regions.
LM5176QPWPTQ1 - 55V 4-Switch Buck-Boost Controller | TI
The Texas Instruments LM5176QPWPTQ1 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. It operates over a wide input voltage range of 4.2V to 55V (60V absolute maximum), making it suitable for automotive, industrial, and telecom applications. The device is offered in a 28-pin HTSSOP (PWP) surface-mount package and is AEC-Q100 qualified for automotive reliability. A buck-boost controller is a type of power management IC that maintains a regulated output voltage regardless of whether the input voltage is higher or lower than the desired output. Unlike a buck converter that steps down, or a boost converter that steps up, a 4-switch buck-boost controller uses four external MOSFETs to achieve both functions, maximizing battery usage and supporting wide input fluctuations. This makes it essential in systems like automotive cold-crank, solar power, and USB PD where the input can vary significantly. Key features include current-mode control in both buck and boost modes for superior line and load transient response, synchronous switching for high efficiency, and a wide 4.2V-55V input range. The device supports frequencies up to [DATA_NEEDED: switching frequency] and drives four external NMOS transistors. The controller also includes [DATA_NEEDED: additional features]. The LM5176QPWPTQ1 employs a 4-switch topology with a high-side and low-side MOSFET for each of the buck and boost stages. Current-mode control ensures smooth transition between modes and protects against overcurrent. The device is designed for rugged automotive environments, operating over a temperature range of [DATA_NEEDED: operating temperature]. With an exposed thermal pad, it efficiently dissipates heat in compact layouts. Typical applications include automotive 12V/24V power distribution, industrial 24V buses, USB PD hubs, battery-powered systems, telecom backplanes, and solar energy harvesters. Its wide input range and high efficiency make it a versatile choice for systems requiring a single controller for both step-up and step-down regulation. When designing with the LM5176QPWPTQ1, ensure adequate input capacitor placement reduces ripple and that the bootstrap diode/capacitor network is correctly sized for the external MOSFETs. A 4-layer PCB with a solid ground plane is recommended for optimal thermal and noise performance.
LM5180NGUR - 65V No-Opto Flyback Converter | Texas Instruments
The Texas Instruments LM5180NGUR is a 65-VIN primary-side regulated (PSR) flyback DC/DC converter with an integrated 100-V, 1.5-A power MOSFET, packaged in an 8-pin WSON (NGU) with exposed thermal pad. It delivers up to 7 W of output power from a wide 4.5 V to 65 V input range while eliminating the need for an optocoupler or TL431 feedback component across the isolation barrier. A flyback converter is an isolated switching-mode power supply (SMPS) topology that stores energy in a transformer during the switch-on period and releases it to the output during the switch-off period. The primary-side regulation (PSR) technique samples the output voltage from the auxiliary winding during the flyback interval, eliminating the secondary-side feedback loop. The LM5180 sits within the converter hierarchy as: switching regulator -> DC-DC converter -> flyback topology -> PSR flyback -> power management IC. Key features include boundary conduction mode (BCM) switching that enables valley switching and a compact magnetic solution, integrated 100-V MOSFET for line-transient headroom, and better than +/-1.5 percent load and line regulation. The device also offers internal compensation, programmable soft-start, and cycle-by-cycle overcurrent limiting. The exposed pad (EP) WSON-8 package provides low thermal resistance suitable for industrial temperature ranges. The LM5180 architecture uses peak current-mode control with built-in ramp generation for inherent input voltage feedforward, simplifying loop compensation. BCM operation reduces switching losses by turning on the MOSFET at the valley of the drain-voltage ringing, while the 100-V MOSFET rating provides ample margin for high-voltage automotive load-dump and industrial transient events. Quasi-resonant switching keeps EMI low without forcing the designer to operate at a fixed frequency. Typical applications include isolated IGBT gate-drive supplies in industrial motor drives, factory-automation analog input modules with 4-20 mA loops, automotive battery-powered HVAC systems, and bias supplies for isolated sensors and interface ICs. The wide input range suits 12-V/24-V industrial bus and 48-V telecom rail applications alike. When designing with the LM5180, choose the flyback transformer turns ratio based on minimum and maximum input voltage, then verify CCM/BCM boundary at full load. Use the TI quick-start calculator to select RFB1, RFB2, Rt, and soft-start capacitor values for the desired regulation and startup behavior. This page synthesizes distributor stock and pricing, drop-in pin-compatible alternatives, and engineering design notes not found in the standalone manufacturer datasheet.
LM536353QRNLTQ1 - 3.5A 36V Sync Step-Down DC-DC | TI Automotive
The Texas Instruments LM536353QRNLTQ1 is a 3.5-A, 36-V synchronous, 2.1-MHz, AEC-Q100-qualified automotive step-down DC-DC converter housed in a 22-pin VQFN-HR (RNL) package. It delivers a fixed 3.3V rail at 3.5A from a 3.5V to 36V input range and integrates both high-side and low-side MOSFETs, eliminating the need for an external FET bridge. The device operates at a fixed 2.1 MHz switching frequency that avoids the AM band, simplifying EMI filtering in infotainment and ADAS platforms. A synchronous buck (step-down) DC-DC converter is a switched-mode power supply topology that reduces a higher DC input voltage to a lower, well-regulated DC output voltage by rapidly switching an inductor-capacitor energy-transfer network. Within the broader hierarchy, the LM536353QRNLTQ1 belongs to: synchronous buck regulator -> step-down (buck) converter -> switched-mode DC-DC converter -> power management IC -> semiconductor. Synchronous designs replace the conventional Schottky rectifier with a low-side MOSFET, raising efficiency at moderate-to-high load currents, reducing conduction losses, and supporting tighter thermal budgets in compact automotive modules. Key features include a 3.5A continuous output current rating, a wide 3.5V to 36V (42V transient) input operating range that tolerates automotive load-dump events, 2.1 MHz fixed-frequency operation, internal high-/low-side synchronous MOSFETs, and integrated bootstrap, compensation, and soft-start circuitry. The fixed 3.3V output version (suffix "33") requires no external resistor divider, simplifying BOM and reducing PCB area. AEC-Q100 Grade 1 (TJ = -40C to +125C) qualification, plus TI's automotive-grade reliability flow, makes the part directly suitable for cabin electronics, infotainment head units, ADAS sensors, and body-control modules. Typical applications include automotive infotainment systems, ADAS sensor power rails (camera, radar, lidar front-end), body-control modules (BCM), instrument clusters, USB charging ports (Type-A/C), and always-on battery-powered subsystems. The 2.1 MHz switching frequency falls above the AM broadcast band, easing CE/RE EMI compliance for OEM vehicle platforms. When designing with the LM536353QRNLTQ1, place the input bypass ceramic (typically 10uF X7R) directly across PVIN and PGND to suppress switching spikes, and follow the datasheet's recommended copper-pour thermal layout. The exposed thermal pad must be soldered to a continuous ground plane to keep junction temperature within the AEC-Q100 envelope under worst-case load-dump conditions. This page synthesizes distributor pricing, verified drop-in alternatives within the LM53635-Q1 family, and practical layout/design notes not collected in a single location in the manufacturer datasheet.
LM536355QRNLRQ1 - 3.5A 36V Auto Sync Step-Down DC-DC | TI
The Texas Instruments LM536355QRNLRQ1 is a 3.5-A, 36-V synchronous, 2.1-MHz, automotive-qualified step-down DC-DC converter housed in a 22-pin VQFN-HR (RNL) package. It belongs to the LM53625-Q1/LM53635-Q1 family, providing a fixed 5-V output from a wide 3.5-V to 42-V input range while supporting automotive load-dump and cold-crank transients. The 2.1-MHz switching frequency keeps the fundamental and harmonics above the AM-band, eliminating the need for shielding on automotive infotament harnesses. A buck (step-down) switching regulator is a DC-DC converter topology that uses an integrated high-side MOSFET, a low-side synchronous rectifier, an inductor, and output capacitors to deliver a lower regulated voltage from a higher input rail. Buck regulators sit in the power-management hierarchy: switching regulator -> DC-DC converter -> power management IC. They outperform linear regulators at large VIN/VOUT ratios because the synchronous rectification keeps efficiency in the 80-95% range, dramatically reducing thermal dissipation in space-constrained automotive ECUs. Key features of the LM536355QRNLRQ1 include 3.5-A continuous output current, 2.1-MHz fixed-frequency operation, AEC-Q100 qualification, 18-V minimum input for a 3.3-V output (per TI product page), internal synchronous FETs, and an adjustable or fixed 5-V output option. The 22-pin VQFN-HR package exposes a thermal pad that, with proper copper area, keeps junction temperature within the 150C automotive Grade-1 limit. Advanced high-speed control loops deliver sub-1% load regulation and fast line transient response for processor rails. The LM536355QRNLRQ1 uses peak-current-mode control with internal compensation, eliminating the need for an external compensation network. The architecture supports spread-spectrum frequency modulation (optional) to ease CISPR 25 EMI compliance in automotive designs. Cycle-by-cycle current limit and thermal shutdown protect the IC from overload and short-circuit faults typical in body-electronics harnesses. Typical applications include automotive infotainment head units, ADAS camera/sensor power, instrument clusters, and body-control modules where a clean 5-V rail is required from a noisy 12-V or 24-V battery bus. The 3.5-A rating also suits USB-PD car chargers and lighting controllers. Designers also use it in industrial PoE point-of-load stages that need 5-V at high current from a 24-V bus. When designing with the LM536355QRNLRQ1, follow the datasheet recommended inductor (typically 1.0 uH to 2.2 uH) and use X7R 10 uF/25-V ceramic input capacitors plus 22 uF/10-V ceramic output capacitors to keep ripple under 30 mV. Place the input capacitors within 5 mm of the PVIN pin and the exposed pad over a 4-cm^2 top-side copper pour to control thermal resistance. This page synthesizes distributor pricing, AEC-Q100 drop-in alternatives, application block diagrams, and PCB-layout guidance not found in the manufacturer datasheet, providing an at-a-glance reference for automotive power-stage selection.
LM61440 - 4A 36V Low EMI Sync Buck Converter | TI
The Texas Instruments LM61440 is a high-performance, synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 4 A of output current over a wide input voltage range of 3.0 V to 36 V with 42 V transient tolerance, easing input surge protection design. It is available in a 14-pin PowerVFQFN (RJR) package with exposed pad. A synchronous buck converter is a DC-DC step-down regulator that uses both high-side and low-side switches to efficiently convert a higher input voltage to a lower output voltage. Unlike asynchronous converters that use a diode for the low-side path, synchronous converters replace the diode with a low-resistance MOSFET, reducing conduction losses and improving efficiency at high output currents. Synchronous buck converters are a cornerstone of power management ICs, enabling compact, high-efficiency point-of-load power supplies across automotive, industrial, and networking systems. Key features of the LM61440 include soft recovery from dropout, which eliminates output overshoot when the input voltage dips close to the regulated output, ensuring stable behavior during cold-crank and sag conditions. The device incorporates pseudo-random spread spectrum to reduce peak EMI, adjustable SW node rise time to optimize the efficiency-versus-EMI trade-off, and a low-EMI VQFN-HR package with minimized switch node ringing. Technically, the LM61440 uses current-mode control with integrated compensation, providing fast transient response and stability across a wide range of output capacitors. The adjustable output goes down to 1 V, suiting modern low-voltage digital cores. The integrated MOSFETs eliminate external FETs, reducing board space and BOM complexity, while the PowerVFQFN exposed pad enables high power density designs. Typical applications include automotive power supplies, industrial control, telecom and networking equipment, and general-purpose point-of-load conversion from 12 V or 24 V rails. The wide input range and 42 V tolerance make it ideal where input spikes are common, and the low EMI features benefit automotive and communications designs with strict CISPR-class requirements. When designing with the LM61440, select input and output capacitors per the TI datasheet recommendations to maintain stability and low ripple; the adjustable SW slew rate lets you trade efficiency for EMI margin.