Product details

Vin (Min) (V) 4 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 28 Iout (Max) (A) 0.6 Iq (Typ) (uA) 80 Switching frequency (Min) (kHz) 935 Switching frequency (Max) (kHz) 1265 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Soft Start Fixed, Synchronous Rectification, UVLO Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
Vin (Min) (V) 4 Vin (Max) (V) 36 Vout (Min) (V) 1 Vout (Max) (V) 28 Iout (Max) (A) 0.6 Iq (Typ) (uA) 80 Switching frequency (Min) (kHz) 935 Switching frequency (Max) (kHz) 1265 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Soft Start Fixed, Synchronous Rectification, UVLO Fixed Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1
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 36-V (Up to 50-V Transient), 0.6-A/1-A Buck Converter in a SOT-23 Package datasheet (Rev. A) 19 Nov 2021
Functional safety information LMR544xx Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA 15 Oct 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

Design & development

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Simulation model

LMR54406 PSpice Transient Model

SLUM800.ZIP (268 KB) - PSpice Model
Simulation model

LMR54406F PSpice Transient Model

SLUM802.ZIP (273 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 (...)
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SOT-23 (DBV) 6 View options

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