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LMR51625
  • LMR51625
  • LMR51625

LMR51625

ACTIVE

SIMPLE SWITCHER® synchronous buck converter with 4.3V-to-60V, 2.5A and low quiescent current

Texas Instruments LMR51625 Product Info

1 April 2026 5

Parameters

Rating

Catalog

Topology

Buck

Iout (max) (A)

2.5

Vin (max) (V)

60

Vin (min) (V)

4.3

Vout (max) (V)

30

Vout (min) (V)

0.8

Features

Enable, Forced PWM, Over Current Protection, Pre-Bias Start-Up, Synchronous Rectification

Control mode

current mode

Operating temperature range (°C)

-40 to 150

Iq (typ) (A)

0.000026

TI functional safety category

Functional Safety-Capable

Package

SOT-23-THN (DDC)-6-8.12 mm² 2.9 x 2.8

Features

  • Functional Safety-Capable
  • Configured for rugged industrial applications:
    • 4.3V to 60V input voltage range
    • 2.5A or 3.5A continuous output current
    • Low operating quiescent current of 29µA
    • 70ns minimum switching on time
    • 400kHz amd 1.1MHz switching frequency
    • Frequency spread spectrum (PFM variant)
    • –40°C to 150°C junction temperature range
    • 96% 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
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options
  • Create a custom design using the LMR516x5 with the WEBENCH Power Designer
  • Functional Safety-Capable
  • Configured for rugged industrial applications:
    • 4.3V to 60V input voltage range
    • 2.5A or 3.5A continuous output current
    • Low operating quiescent current of 29µA
    • 70ns minimum switching on time
    • 400kHz amd 1.1MHz switching frequency
    • Frequency spread spectrum (PFM variant)
    • –40°C to 150°C junction temperature range
    • 96% 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
  • Various options in pin-to-pin compatible package
    • PFM and forced PWM (FPWM) options
  • Create a custom design using the LMR516x5 with the WEBENCH Power Designer

Description

The LMR516x5 is a wide-VIN, easy-to-use, synchronous buck converter capable of driving up to 2.5A or 3.5A load current. With a wide input range of 4.3V to 60V, the device is designed for a wide range of industrial applications for power conditioning from an unregulated source.

The LMR516x5 operates at 400kHz or 1.1MHz switching frequency to support use of relatively small inductors for an optimized design size. The device has a pulse frequency modulation (PFM version) to realize high efficiency at light load and a forced pulse width modulation (PFM 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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