LMR54406

Name: LMR54406
Brand: TI
SKU: LMR54406
Price: 0.469 USD

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4V to 36V, 0.6A, 80-µA Iq synchronous buck SIMPLE SWITCHER® power converter

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Data sheet

document-pdfAcrobat LMR544xx SIMPLE SWITCHER Power Converter 4V to 45V, 0.6A/1A Buck Converter in a SOT-23 Package datasheet (Rev. E) PDF | HTML

LMR54406

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Data sheet

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Product details

Rating

Catalog

Topology

Buck

Iout (max) (A)

0.6

Vin (max) (V)

36

Vin (min) (V)

4

Vout (max) (V)

28

Vout (min) (V)

0.8

Features

Enable, Fixed soft start, Forced PWM, Light-load efficiency, Overcurrent protection, Pre-bias startup, Synchronous rectification, UVLO Fixed

Control mode

current mode

Operating temperature range (°C)

-40 to 150

Iq (typ) (A)

0.00008

Duty cycle (max) (%)

98

Sector

Robotics

Rating

Catalog

Topology

Buck

Iout (max) (A)

0.6

Vin (max) (V)

36

Vin (min) (V)

4

Vout (max) (V)

28

Vout (min) (V)

0.8

Features

Enable, Fixed soft start, Forced PWM, Light-load efficiency, Overcurrent protection, Pre-bias startup, Synchronous rectification, UVLO Fixed

Control mode

current mode

Operating temperature range (°C)

-40 to 150

Iq (typ) (A)

0.00008

Duty cycle (max) (%)

98

Sector

Robotics

SOT-23 (DBV)

6

8.12 mm² 2.9 x 2.8

Functional Safety-Capable
- Documentation available to aid functional safety system design
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
- Documentation available to aid functional safety system design
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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Top documentation	Type	Title	Format options	Date
*	Data sheet	LMR544xx SIMPLE SWITCHER Power Converter 4V to 45V, 0.6A/1A Buck Converter in a SOT-23 Package datasheet (Rev. E)	PDF \| HTML	02 Jan 2026
	Analog Design Journal	적응형 공급을 사용해 PLC 출력 전력 손 실을 반으로 줄이는 방법	PDF \| HTML	30 Apr 2026
	Analog Design Journal	如何使用適應性電源將 PLC 輸出功耗減半	PDF \| HTML	24 Apr 2026
	Analog Design Journal	How to cut PLC output power dissipation in half using an adaptive supply	PDF \| HTML	10 Apr 2026
	Functional safety information	LMR544xx Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA	PDF \| HTML	15 Oct 2021

Design & development

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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