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LMR54410

ACTIVE

SIMPLE SWITCHER® power converter 4.5-V to 36-V, 1-A, synchronous buck with 80-µA IQ

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Data sheet

LMR54410

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1 Vin (min) (V) 4 Vin (max) (V) 36 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, UVLO fixed Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 28 Iq (typ) (µA) 80 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 125 Topology Buck Type Converter Iout (max) (A) 1 Vin (min) (V) 4 Vin (max) (V) 36 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, UVLO fixed Control mode current mode Vout (min) (V) 0.8 Vout (max) (V) 28 Iq (typ) (µA) 80 Duty cycle (max) (%) 98
SOT-23 (DBV) 6 8.12 mm² 2.9 x 2.8
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4V to 36V input voltage range
    • Withstands up to 50V short VIN transient
    • 0.6A/1A continuous output current
    • 60ns minimum switching on time
    • 1.1MHz fixed switching frequency
    • –40°C to 150°C junction temperature range
    • 98% maximum duty cycle
    • Monotonic start-up with prebiased output
    • Short-circuit protection with hiccup mode
    • Precision enable
    • ±1% tolerance voltage reference
  • Small design 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
    • 4V to 36V input voltage range
    • Withstands up to 50V short VIN transient
    • 0.6A/1A continuous output current
    • 60ns minimum switching on time
    • 1.1MHz fixed switching frequency
    • –40°C to 150°C junction temperature range
    • 98% maximum duty cycle
    • Monotonic start-up with prebiased output
    • Short-circuit protection with hiccup mode
    • Precision enable
    • ±1% tolerance voltage reference
  • Small design 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 1A and 0.6A load current. With a wide input range of 4V to 36V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR544xx operates at 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The devices have 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 1A and 0.6A load current. With a wide input range of 4V to 36V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR544xx operates at 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The devices have 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 Power Converter 4V to 45V, 0.6A/1A Buck Converter in a SOT-23 Package datasheet (Rev. D) PDF | HTML 10 Apr 2024
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

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
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Simulation model

LMR54410F PSpice Transient Model (Rev. A)

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

SLURB07 — LMR54410 Quick Start Tool

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC converters (integrated FET)
LMR54410 — SIMPLE SWITCHER® power converter 4.5-V to 36-V, 1-A, synchronous buck with 80-µA IQ
Download
PCB layout

LMR544xx PCB Layout Files

SLURB08.ZIP (2441 KB)
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Reference designs

PMP23365 — 24V, 3A Class 8 PoE PD reference design with external hot swap and telemetry

This reference design implements a Power-over-Ethernet (PoE) power device (PD) active-clamp forward converter with 24V and 3A output. A TPS23730 PD with integrated pulse-width modulator (PWM) controller provides the necessary functions for the PoE PD and PWM control for the active-clamp forward (...)
Test report: PDF
Reference designs

TIDA-010087 — 100-A Dual-phase digital control battery tester reference design

This reference design illustrates a method to precisely control the current and voltage of a bidirectional interleaved buck-converter power stage using a C2000™ microcontroller (MCU) and a precision ADC ADS131M08. This design achieves less than ±20-mA current regulation error, and (...)
Design guide: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23 (DBV) 6 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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