Product details

Vin (Min) (V) 3 Vin (Max) (V) 42 Vout (Min) (V) 1 Vout (Max) (V) 32 Iout (Max) (A) 2 Iq (Typ) (uA) 2 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, UVLO Fixed, Wettable Flanks Package Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1
Vin (Min) (V) 3 Vin (Max) (V) 42 Vout (Min) (V) 1 Vout (Max) (V) 32 Iout (Max) (A) 2 Iq (Typ) (uA) 2 Switching frequency (Min) (kHz) 200 Switching frequency (Max) (kHz) 2200 Features Enable, Fixed Output, Forced PWM, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification, UVLO Fixed, Wettable Flanks Package Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1
VQFN-HR (RPE) 9 4 mm² 2 x 2 VQFN-HR (RPE) 9
  • AEC-Q100-qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • 89% efficiency at 1 mA, 13.5 VIN, fixed 3.3 VOUT
    • 1.2-µA total non-switching IQ at 13.5 VIN, fixed 3.3 VOUT
  • Miniature solution size and low component cost
    • 2-mm × 2-mm HotRod™ package with wettable flanks
    • Internal compensation
  • Optimized for ultra-low EMI requirements
    • Spread spectrum reduces peak emissions
    • Pin selectable FPWM mode for constant frequency at light loads with MODE/SYNC pin
    • FSW synchronization with MODE/SYNC pin
  • Designed for automotive applications
    • Junction temperature range: –40°C to +150°C
    • Supports 42-V automotive load dump
    • Supports 3-VIN for automotive cold crank
    • Adjustable up to 95% of VIN, 3.3-V and 5-V fixed VOUT options available
  • Suitable for scalable power supplies
    • Adjustable FSW: 200 kHz to 2.2 MHz with the RT pin
    • Pin compatible with:
  • AEC-Q100-qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
  • 89% efficiency at 1 mA, 13.5 VIN, fixed 3.3 VOUT
    • 1.2-µA total non-switching IQ at 13.5 VIN, fixed 3.3 VOUT
  • Miniature solution size and low component cost
    • 2-mm × 2-mm HotRod™ package with wettable flanks
    • Internal compensation
  • Optimized for ultra-low EMI requirements
    • Spread spectrum reduces peak emissions
    • Pin selectable FPWM mode for constant frequency at light loads with MODE/SYNC pin
    • FSW synchronization with MODE/SYNC pin
  • Designed for automotive applications
    • Junction temperature range: –40°C to +150°C
    • Supports 42-V automotive load dump
    • Supports 3-VIN for automotive cold crank
    • Adjustable up to 95% of VIN, 3.3-V and 5-V fixed VOUT options available
  • Suitable for scalable power supplies
    • Adjustable FSW: 200 kHz to 2.2 MHz with the RT pin
    • Pin compatible with:

The LMR436x0-Q1 is the industry’s smallest 36-V, 2-A and 1-A synchronous step-down DC/DC converters in a 2-mm × 2-mm HotRod package. This easy-to-use converter supports a wide input voltage range of 3.0 V to 36 V with transients up to 42 V.

The LMR43620-Q1 is specifically designed to meet low standby power requirements for always on, automotive applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of 1.5 µA at 13.5 VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances provide exceptional efficiency across the entire load range.

The control architecture and feature set are optimized for an ultra-small solution size. The device uses peak current mode control to minimize output capacitance. The LMR436x0-Q1 minimizes input filter size by utilizing pseudorandom spread spectrum, a low-EMI HotRod package, and an optimized pinout. The MODE/SYNC and RT pin variants can be used to set or synchronize the frequency between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands.

The rich feature set of the LMR436x0-Q1 is designed to simplify implementation for a wide range of automotive end equipments.

The LMR436x0-Q1 is the industry’s smallest 36-V, 2-A and 1-A synchronous step-down DC/DC converters in a 2-mm × 2-mm HotRod package. This easy-to-use converter supports a wide input voltage range of 3.0 V to 36 V with transients up to 42 V.

The LMR43620-Q1 is specifically designed to meet low standby power requirements for always on, automotive applications. Auto mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of 1.5 µA at 13.5 VIN and high light load efficiency. A seamless transition between PWM and PFM modes along with very low MOSFET ON resistances provide exceptional efficiency across the entire load range.

The control architecture and feature set are optimized for an ultra-small solution size. The device uses peak current mode control to minimize output capacitance. The LMR436x0-Q1 minimizes input filter size by utilizing pseudorandom spread spectrum, a low-EMI HotRod package, and an optimized pinout. The MODE/SYNC and RT pin variants can be used to set or synchronize the frequency between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands.

The rich feature set of the LMR436x0-Q1 is designed to simplify implementation for a wide range of automotive end equipments.

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Technical documentation

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Type Title Date
* Data sheet LMR436x0-Q1, 36-V, 1-A/2-A Buck Converter with <3 µA IQ at 150°C TJMAX in 4-mm2 HotRod QFN datasheet (Rev. C) 07 Dec 2021
User guide LMR43620-Q1 EVM User's Guide (Rev. B) 07 Dec 2021
Functional safety information LMR436x0/LMR436x0-Q1 Functional Safety, FIT Rate, FMD and Pin FMA 07 Dec 2021
White paper Overcoming Low-IQ Challenges in Low-Power Applications (Rev. A) 15 Sep 2021
Technical article Lowering audible noise in automotive applications with TI’s DRSS technology 18 Mar 2021
Certificate LMR43620MQ3EVM-2M EU Declaration of Conformity (DoC) 08 Sep 2020
Application note EMI Reduction Technique, Dual Random Spread Spectrum 19 Jun 2020
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LMR43620MQ3EVM-2M — LMR43620-Q1 evaluation module 36-V, 2-A, 2-mm x 2-mm, synchronous step-down converter

The LMR43620MQ3EVM-2M evaluation module (EVM) helps designers evaluate the operation and performance of the LMR43620-Q1 wide-input buck regulator. The LMR43620-Q1 is an easy-to-use synchronous step-down DC/DC converter capable of driving up to 2 A of load current from an input voltage of up to 36 (...)

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Simulation model

LMR43620MSC3-Q1 PSpice Transient Model

SNVMC98.ZIP (315 KB) - PSpice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Gerber file

LMR43620-Q1 EVM Design Files

SNVC247.ZIP (3139 KB)
Package Pins Download
VQFN-HR (RPE) 9 View options

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