Product details

Vin (Min) (V) 4.5 Vin (Max) (V) 36 Vout (Min) (V) 0.6 Vout (Max) (V) 34.2 Iout (Max) (A) 2 Iq (Typ) (uA) 40 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 1100 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
Vin (Min) (V) 4.5 Vin (Max) (V) 36 Vout (Min) (V) 0.6 Vout (Max) (V) 34.2 Iout (Max) (A) 2 Iq (Typ) (uA) 40 Switching frequency (Min) (kHz) 500 Switching frequency (Max) (kHz) 1100 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Synchronous Rectification Rating Catalog Regulated outputs (#) 1 Control mode Current Mode Duty cycle (Max) (%) 98
SOT-23-THN (DDC) 6 5 mm² 2.9 x 1.6 SOT-23-THN (DDC) 6
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4.5-V to 36-V input voltage range
    • 2-A continuous output current
    • 70-ns minimum switching on time
    • 500-kHz and 1.1-MHz fixed switching frequency options
    • –40°C to 150°C junction temperature range
    • 98% maximum duty cycle
    • Start-up with prebiased output
    • Internal short circuit protection with hiccup mode
    • ±1.5% tolerance voltage reference
    • Precision enable
  • 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 TPS54202 and TPS54302
  • PFM and forced PWM (FPWM) options available
  • Create a custom design using the LMR51420 with the WEBENCH Power Designer
  • Functional Safety-Capable
  • Configured for rugged industrial applications
    • 4.5-V to 36-V input voltage range
    • 2-A continuous output current
    • 70-ns minimum switching on time
    • 500-kHz and 1.1-MHz fixed switching frequency options
    • –40°C to 150°C junction temperature range
    • 98% maximum duty cycle
    • Start-up with prebiased output
    • Internal short circuit protection with hiccup mode
    • ±1.5% tolerance voltage reference
    • Precision enable
  • 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 TPS54202 and TPS54302
  • PFM and forced PWM (FPWM) options available
  • Create a custom design using the LMR51420 with the WEBENCH Power Designer

The LMR51420 is a wide-VIN, easy-to-use SIMPLE SWITCHER synchronous buck converter capable of driving up to 2-A load current. With a wide input range of 4.5 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR51420 operates at 500-kHz and 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. The device has a PFM version to realize high efficiency at light load and 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 allows the device to be used with minimum 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 LMR51420 is available in a 6-pin SOT-23 package.

The LMR51420 is a wide-VIN, easy-to-use SIMPLE SWITCHER synchronous buck converter capable of driving up to 2-A load current. With a wide input range of 4.5 V to 36 V, the device is suitable for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR51420 operates at 500-kHz and 1.1-MHz switching frequency to support use of relatively small inductors for an optimized solution size. The device has a PFM version to realize high efficiency at light load and 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 allows the device to be used with minimum 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 LMR51420 is available in a 6-pin SOT-23 package.

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Technical documentation

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Type Title Date
* Data sheet LMR51420 SIMPLE SWITCHER® 4.5-V to 36-V, 2-A, Synchronous Buck Converter in a SOT-23 Package datasheet (Rev. B) PDF | HTML 05 Aug 2022
Functional safety information LMR514x0 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 15 Oct 2021
User guide LMR51420EVM User's Guide PDF | HTML 13 Oct 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019

Design & development

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Evaluation board

LMR51420EVM — LMR51420 evaluation module 4.5-V to 36-V, 2-A synchronous step-down converter

The LMR51420EVM is a fully assembled and tested circuit for evaluating the LMR51420 step-down converter. The board is set as a 5-V Vout. The board also has AC signal injection terminals for loop measurements.
User guide: PDF | HTML
Not available on TI.com
Simulation model

LMR51420XF PSpice Transient Model

SLUM825.ZIP (288 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-THIN (DDC) 6 View options

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