3.8-V to 36-V, 3-A, ultra-small synchronous step-down converter


Product details


Vin (Min) (V) 3.8 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 24 Iout (Max) (A) 3 Iq (Typ) (uA) 24 Switching frequency (Min) (kHz) 400 Switching frequency (Max) (kHz) 1000 Features Enable, Light Load Efficiency, Over Current Protection, Power Good, Soft Start Fixed, Synchronous Rectification, UVLO Adjustable, Wettable Flanks Package Operating temperature range (C) -40 to 150 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

WQFN-FCRLF (RPK) 13 6 mm² 3 x 2 open-in-new Find other Buck converters (integrated switch)


  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Low EMI and switching noise
    • Meets CISPR22 class 5 standard
    • Enhanced QFN package minimizes parasitic inductance and switch node ringing
  • Configured for rugged industrial applications
    • Standard QFN footprint: single large thermal pad and all pins accessible from perimeter
    • Pin compatible variants:
    • Junction temperature range –40°C to +150°C
    • Frequency: 400 kHz, 1 MHz
    • Output voltage range: 1 V to 24 V
  • High efficiency power conversion at all loads
    • Peak efficiency > 95%
    • 90% PFM efficiency at 10-mA, 12 VIN, 5 VOUT
    • Low operating quiescent current of 25 µA
  • Create a custom design using the LM60440 with the WEBENCH® Power Designer
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The LM604x0 regulator is an easy-to-use, synchronous, step-down DC/DC converter that delivers best-in-class efficiency for rugged industrial applications. The LM60430 drives up to 3-A of load current, and the LM60440 is industry’s smallest 4A step-down converter.

The LM604x0 is available in an ultra-miniature WQFN package with wettable flanks and a standard QFN pin-out with a thermal pad to enhance thermal performance. This enhanced QFN package features extremely small parasitic inductance and resistance, enabling very high efficiency while minimizing switch node ringing and dramatically reducing EMI.

The LM604x0 uses peak-current-mode control to automatically fold back frequency at light load to ensure exceptional efficiency across the entire load range. The low power dissipation paired with a thermally optimized QFN package enables a power dense solution size. In addition the device requires few external components and has a pinout designed for simple PCB layout. The small solution size and feature set of the LM604x0 are designed to simplify implementation for a wide range of end equipment.

This device is also available in an AEC-Q100-qualified version.

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Technical documentation

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Type Title Date
* Data sheet LM604x0 3.8-V to 36-V, 3-A, and 4-A Ultra-Small Synchronous Step-Down Converter datasheet (Rev. A) Jun. 18, 2020
Application note Enhanced HotRod QFN Package: Industry-Best Size with Low EMI (Rev. A) Aug. 17, 2021
Application note LM604x0 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA Oct. 01, 2020
User guide LM60440AQEVM User's Guide Oct. 08, 2019
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 LM60440AQEVM evaluation module (EVM) helps designers evaluate the operation and performance of the LM60440-Q1 wide-input buck regulator. The LM60440-Q1 is an easy-to-use synchronous step-down DC/DC converter capable of driving up to 4 A of load current from an input voltage of up to 36 V. The (...)
  • Tested against CISPR 25 class 5 standards
  • EMI enhanced QFN package
  • Thermally optimized for high power density
  • Small solution size with low BOM count

Design tools & simulation

SNVMBY5.ZIP (172 KB) - PSpice Model
SNVMBY7.ZIP (159 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
  • (...)

CAD/CAE symbols

Package Pins Download
WQFN-HR (RPK) 13 View options

Ordering & quality

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