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


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, Forced PWM, 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 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

VQFN-HR (RJR) 14 14 mm² 4 x 3.5 open-in-new Find other Buck converters (integrated switch)


  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +150°C, TJ
  • Functional Safety-Capable
  • Optimized for ultra-low EMI requirements
    • Meets CISPR25 class 5 standard
    • Hotrod™ package minimizes switch node ringing
    • Internal bypass capacitors reduce EMI
    • Parallel input path minimizes parasitic inductance
    • Spread spectrum reduces peak emissions
    • Adjustable switch node rise time
  • Designed for rugged Automotive applications
    • Supports 42-V load dump
    • 0.4-V dropout with 4-A load (typical)
  • High efficiency power conversion at all loads
    • 7-µA no load current at 13.5 VIN, 3.3 VOUT
    • 90% PFM efficiency at 1-mA, 13.5 VIN, 5 VOUT
    • Low MOSFET ON resistance
      • RDS_ON_HS = 41 mΩ (typical)
      • RDS_ON_LS = 21 mΩ (typical)
  • External bias option for improved efficiency
  • Pin compatible with:

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The LMQ62440-Q1 is a high-performance, DC-DC synchronous buck converter with integrated bypass capacitors. 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 400 ms. The device implements soft recovery from dropout eliminating overshoot on the output.

The device is specifically designed for minimal EMI. The device incorporates pseudo-random spread spectrum, integrated bypass capacitors, 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 device is available in a 14-pin VQFN-HR package with wettable flanks. Electrical characteristics are specified over a junction temperature range of –40°C to +150°C. Find additional resources in the Related Documentation.

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Technical documentation

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Type Title Date
* Data sheet LMQ62440-Q1 Automotive 3-V to 36-V, Low EMI Synchronous Step-Down Converter datasheet (Rev. A) Sep. 24, 2020
White paper 透過節省時間和成本的創新技術 降低電源中的EMI Dec. 04, 2020
White paper 전원 공급 장치의 EMI 절감을 위한 시간 및 비용 효율적 혁신 Dec. 04, 2020
White paper Time-Saving and Cost-Effective Innovations for EMI Reduction Nov. 11, 2020
User guide LMQ62440EVM 2-MHz User's Guide Sep. 14, 2020
Functional safety information LMQ6x4x0-Q1 Functional Safety, FIT Rate, FMD, and Pin FMA (Rev. A) Sep. 09, 2020
Certificate LMQ62440EVM-2MHz EU Declaration of Conformity (DoC) Sep. 01, 2020
Functional safety information LMQ62440-Q1 Functional Safety, FIT Rate, and Failure Mode Distribution Apr. 01, 2020
Technical article Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019

Design & development

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Hardware development

document-generic User guide
The LMQ62440EVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMQ62440 synchronous step-down converter.  The LMQ62440 provides exceptional efficiency, low Iq, and low EMI in small solution size with integrated capacitors.
  • Spread spectrum operation
  • Controlled recover from dropout
  • Low operating quiescent current
  • High efficiency
  • Low minimum on-time
  • Adjustable rise time

Design tools & simulation

SNVMC42.ZIP (129 KB) - PSpice Model
SNVMC43.ZIP (292 KB) - PSpice Model
SNVMC44.ZIP (298 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SNVR489.ZIP (3467 KB)

CAD/CAE symbols

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VQFN-HR (RJR) 14 View options

Ordering & quality

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