Product details

Vin (Min) (V) 3.8 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 24 Iout (Max) (A) 4 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 Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 3.8 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 24 Iout (Max) (A) 4 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 Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
WQFN-FCRLF (RPK) 13 6 mm² 3 x 2
  • 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
  • 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

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.

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) PDF | HTML 18 Jun 2020
Application note Enhanced HotRod QFN Package: Industry-Best Size with Low EMI (Rev. A) PDF | HTML 17 Aug 2021
Functional safety information LM604x0 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 01 Oct 2020
EVM User's guide LM60440AQEVM User's Guide 08 Oct 2019
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

LM60440AQEVM — 36-V, 4-A, 2x3-mm synchronous step-down converter evaluation module

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 (...)
Not available on TI.com
Simulation model

LM60440A-Q1 PSpice Unencrypted Transient Model

SNVMBY4.ZIP (158 KB) - PSpice Model
Simulation model

LM60440D PSpice Unencrypted Transient Model

SNVMBY6.ZIP (177 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 (...)
Calculation tool

LM60440-Q1 Quick Start Calculator

SNVR483.ZIP (638 KB)
Package Pins Download
WQFN-HR (RPK) 13 View options

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