Product details

Vin (Min) (V) 4 Vin (Max) (V) 36 Vout (Min) (V) 0.8 Vout (Max) (V) 28 Iout (Max) (A) 1 Iq (Typ) (uA) 80 Switching frequency (Min) (kHz) 1100 Switching frequency (Max) (kHz) 1100 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 4 Vin (Max) (V) 36 Vout (Min) (V) 0.8 Vout (Max) (V) 28 Iout (Max) (A) 1 Iq (Typ) (uA) 80 Switching frequency (Min) (kHz) 1100 Switching frequency (Max) (kHz) 1100 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Pre-Bias Start-Up, Soft Start Fixed, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
SOT-23 (DBV) 6 5 mm² 2.9 x 1.6
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4-V to 36-V input voltage range
    • Withstands up to 50-V short VIN transient
    • 0.6-A/1-A continuous output current
    • 60-ns minimum switching on time
    • 1.1-MHz fixed switching frequency
    • –40°C to 150°C junction temperature range
    • 98% maximum duty cycle
    • Monotonic start-up with pre-biased output
    • Short circuit protection with hiccup mode
    • Precision enable
    • ±1% tolerance voltage reference
  • Small solution size and ease of use
    • Integrated synchronous rectification
    • Internal compensation for ease of use
    • SOT-23 package
  • Pin-to-pin compatible with the LMR14010A, LMR50410, and TPS560430
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4-V to 36-V input voltage range
    • Withstands up to 50-V short VIN transient
    • 0.6-A/1-A continuous output current
    • 60-ns minimum switching on time
    • 1.1-MHz fixed switching frequency
    • –40°C to 150°C junction temperature range
    • 98% maximum duty cycle
    • Monotonic start-up with pre-biased output
    • Short circuit protection with hiccup mode
    • Precision enable
    • ±1% tolerance voltage reference
  • Small solution size and ease of use
    • Integrated synchronous rectification
    • Internal compensation for ease of use
    • SOT-23 package
  • Pin-to-pin compatible with the LMR14010A, LMR50410, and TPS560430
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options

The LMR544xx is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 1-A and 0.6-A load current. With a wide input range of 4 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR544xx operates at 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. It has a PFM version to realize high efficiency at light load and a FPWM version to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.

The LMR544xx is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 1-A and 0.6-A load current. With a wide input range of 4 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR544xx operates at 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. It has a PFM version to realize high efficiency at light load and a FPWM version to achieve constant frequency and small output voltage ripple over the full load range. Soft-start and compensation circuits are implemented internally, which allow the device to be used with minimal external components.

The device has built-in protection features, such as cycle-by-cycle current limit, hiccup mode short-circuit protection, and thermal shutdown in case of excessive power dissipation.

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Technical documentation

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Type Title Date
* Data sheet LMR544xx SIMPLE SWITCHER® 4-V to 45-V, 0.6-A/1-A Buck Converter in a SOT-23 Package datasheet (Rev. B) PDF | HTML 15 Feb 2022
Certificate LMR54410EVM EU RoHS Declaration of Conformity (DoC) 16 Nov 2021
User guide LMR54410EVM User's Guide PDF | HTML 15 Oct 2021
Functional safety information LMR544xx Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 15 Oct 2021
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

LMR50410EVM — 4-V to 36-V, 1-A synchronous step-down converter evaluation module

The LMR50410EVM evaluation module (EVM) is a fully assembled and tested circuit for evaluating the LMR50410 step-down converter. The board is set as a 3.3-V Vout. The board also has AC signal injection terminals for loop measurements.
User guide: PDF
Not available on TI.com
Evaluation board

LMR54410EVM — LMR54410 evaluation module with 4-V to 36-V, 1-A synchronous step-down converter

The LMR54410EVM is a fully assembled and tested circuit for evaluating the LMR54410 step-down converter. The board has a jumper connector to enable pin and could provide pull up device to VIN or external high level enable. The board is set as a 3.3-V-Vout. The board also has AC signal injection (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LMR54410 PSpice Transient Model (Rev. A)

SLUM799A.ZIP (266 KB) - PSpice Model
Simulation model

LMR54410F PSpice Transient Model (Rev. A)

SLUM801A.ZIP (267 KB) - PSpice Model
Calculation tool

LMR54410 Quick Start Tool

SLURB07.ZIP (421 KB)
PCB layout

LMR544xx PCB Layout Files

SLURB08.ZIP (2441 KB)
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 (...)
Package Pins Download
SOT-23 (DBV) 6 View options

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