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LMR51420

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SIMPLE SWITCHER® power converter 4.5V-to-36V, 2A, synchronous buck with 40µA IQ

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Data sheet

LMR51420

ACTIVE
Data sheet Order now

Product details

Rating Catalog Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 2 Vin (min) (V) 4.5 Vin (max) (V) 36 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 1100 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Synchronous Rectification Control mode current mode Vout (min) (V) 0.6 Vout (max) (V) 34.2 Iq (typ) (µA) 40 Duty cycle (max) (%) 98
Rating Catalog Operating temperature range (°C) -40 to 150 TI functional safety category Functional Safety-Capable Topology Buck Type Converter Iout (max) (A) 2 Vin (min) (V) 4.5 Vin (max) (V) 36 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 1100 Features Enable, Forced PWM, Light Load Efficiency, Over Current Protection, Synchronous Rectification Control mode current mode Vout (min) (V) 0.6 Vout (max) (V) 34.2 Iq (typ) (µA) 40 Duty cycle (max) (%) 98
SOT-23-THN (DDC) 6 8.12 mm² 2.9 x 2.8
  • 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 power converter 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 power converter 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® Power Converter 4.5-V to 36-V, 2-A, Synchronous Buck datasheet (Rev. C) 23 Nov 2022
White paper Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) PDF | HTML 30 Apr 2024
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

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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

LM51420X PSpice Transient Model

SLUM848.ZIP (358 KB) - PSpice Model
Download
Simulation model

LMR51420XF PSpice Transient Model

SLUM825.ZIP (288 KB) - PSpice Model
Download
Reference designs

PMP41037 — 1kW, 800V to 12V serial half-bridge bidirectional DCX with GaN and C2000

This reference design is a 1kW bidirectional DC transformer (DCX), converting 800V DC bus into 12V with isolation. The design is controlled by F280039C and constantly operated at the resonant frequency of the resonant tank. The primary side uses LMG3622 GaN serial half bridge to handle up to 900V (...)
Test report: PDF
Package Pins CAD symbols, footprints & 3D models
SOT-23-THN (DDC) 6 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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