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LM62440-Q1

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Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter

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Data sheet
Automotive 3-V to 36-V, 4-A, low-noise synchronous step-down converter

LM62440-Q1

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 3 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 4 Iq (Typ) (uA) 7 Switching frequency (Min) (kHz) 2200 Switching frequency (Max) (kHz) 2200 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable Flanks Package Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1
Vin (Min) (V) 3 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 34 Iout (Max) (A) 4 Iq (Typ) (uA) 7 Switching frequency (Min) (kHz) 2200 Switching frequency (Max) (kHz) 2200 Features Enable, Frequency Synchronization, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Spread Spectrum, Synchronous Rectification, Wettable Flanks Package Operating temperature range (C) -40 to 150 Rating Automotive Regulated outputs (#) 1
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VQFN-HR (RJR) 14 14 mm² 4 x 3.5
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  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Spread spectrum reduces peak emissions
    • Adjustable SW node rise time
    • Pin selectable FPWM mode for constant frequency at light loads
  • Designed for automotive applications
    • Supports 42-V automotive load dump
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN, with factory options for 5-V and 3.3-V fixed output voltage
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Optimized for ultra low EMI requirements
    • Hotrod™ package and parallel input path minimize switch node ringing
    • Spread spectrum reduces peak emissions
    • Adjustable SW node rise time
    • Pin selectable FPWM mode for constant frequency at light loads
  • Designed for automotive applications
    • Supports 42-V automotive load dump
    • ±1% total output regulation accuracy
    • VOUT adjustable from 1 V to 95% of VIN, with factory options for 5-V and 3.3-V fixed output voltage
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 83% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • External bias option for improved efficiency
  • Suitable for scalable power supplies
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The LM62440-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; 42 V tolerance supports load dump for durations of 400ms. The LM62440-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM62440-Q1 is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

The LM62440-Q1 is an automotive-focused, high-performance, DC-DC synchronous step-down converter. With integrated high-side and low-side MOSFETs, up to 4 A of output current is delivered over a wide input range of 3.0 V to 36 V; 42 V tolerance supports load dump for durations of 400ms. The LM62440-Q1 implements soft recovery from dropout eliminating overshoot on the output.

The LM62440-Q1 is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, adjustable SW node rise time, low-EMI VQFN-HR package featuring low switch node ringing, and optimized pinout for ease of use. The switching frequency can be synchronized between 200 kHz and 2.2 MHz to avoid noise sensitive frequency bands. In addition the frequency can be selected for improved efficiency at low operating frequency or smaller solution size at high operating frequency.

Auto-mode enables frequency foldback when operating at light loads, allowing an unloaded current consumption of only 7 µA (typical) and high light load efficiency. Seamless transition between PWM and PFM modes, along with very low MOSFET ON resistances and an external bias input, ensures exceptional efficiency across the entire load range.

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Technical documentation

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Type Title Date
* Data sheet LM62440-Q1 Automotive 3-V to 36-V, 4-A, Low EMI Synchronous Step-Down Converter datasheet (Rev. D) 22 Jun 2021
Application note How to Migrate Between LM614xx and LM624xx Product Families 01 Nov 2021
Technical article Introduction to EMI: Standards, causes and mitigation techniques 21 Apr 2021
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Technical article Powering levels of autonomy: a quick guide to DC/DC solutions for SAE autonomy levels 18 Nov 2020
Functional safety information LM62440-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution 02 Apr 2020
Technical article Optimizing flip-chip IC thermal performance in automotive designs 11 Dec 2019
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
User guide LM62440-Q1 EVM User's Guide 22 Jun 2018

Design & development

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

Evaluation board

LM62440EVM — 36-V, low EMI 4-A, 5-V synchronous, 2-MHz, step-down converter evaluation module

The LM62440 evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LM62440 synchronous step-down converter.  The LM62440 provides exceptional efficiency, low Iq, and low EMI in small solution size.
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Evaluation board

LP877451Q1EVM — LP8774x-Q1 ADAS PMIC low-noise configuration 3-buck and 5-V boost evaluation module

The LP8774x-Q1 device is designed to meet the power management requirements of the AWR and IWR MMICs in various automotive and industrial radar applications. The device has three step-down DC/DC converters, a 5 V boost converter and a 1.8 V/3.3 V LDO. The LDO is powered from the boost and (...)

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Simulation model

LM62440APP-Q1 PSpice Transient Model

SNVMC36.ZIP (142 KB) - PSpice Model
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Simulation model

LM62440BPP-Q1 PSpice Transient Model

SNVMC37.ZIP (280 KB) - PSpice Model
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Simulation model

LM62440CPP-Q1 PSpice Transient Model

SNVMC38.ZIP (280 KB) - PSpice Model
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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 (...)
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PCB layout

LM62440 EVM Design files Upload

SNVR477.ZIP (3141 KB)
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Package Pins Download
VQFN-HR (RJR) 14 View options

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