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TPS543B25T
  • TPS543B25T
  • TPS543B25T

TPS543B25T

ACTIVE

4-V to 18-V input, 25-A synchronous SWIFT™ step-down converter with thermally enhanced pack

Texas Instruments TPS543B25T Product Info

1 April 2026 1

Parameters

Rating

Catalog

Iout (max) (A)

25

Vin (max) (V)

18

Vin (min) (V)

4

Vout (max) (V)

7

Vout (min) (V)

0.5

Features

Adjustable current limit, Differential Remote Sense, Enable, Forced PWM, Frequency synchronization, Over Current Protection, Power good, Pre-Bias Start-Up, Soft Start Adjustable, Synchronous Rectification, UVLO adjustable

Control mode

ACM/AECM

Operating temperature range (°C)

-40 to 150

Iq (typ) (A)

0.0012

Duty cycle (max) (%)

94

Package

WQFN-FCRLF (RAS)-17-11.25 mm² 4.5 x 2.5

Features

  • Integrated 6.5mΩ and 2mΩ MOSFETs
  • 4V to 18V input voltage range
  • Fixed-frequency, internally compensated, advanced current mode (ACM) control
  • 0.5V to 7V output voltage range
  • True differential remote sense amplifier (RSA)
  • Three selectable PWM ramp options to optimize the control loop performance
  • Five selectable switching frequencies: 500kHz, 750kHz, 1MHz, 1.5MHz, and 2.2MHz
  • Synchronizable to an external clock
  • 0.5V, ±0.5% voltage reference accuracy over full temperature range
  • 1ms, 2ms, 4ms, and 8ms selectable soft-start times
  • Monotonic start-up into prebiased outputs
  • Selectable current limits to support 25A and 20A operation
  • Enable with adjustable input undervoltage lockout
  • Power-good output monitor
  • Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection
  • –40°C to 150°C operating junction temperature
  • 2.5mm × 4.5mm, 17-pin WQFN-HR package with 0.5mm pitch
  • Lead-free (RoHS compliant), Lead-free (Pb-free) conversion
  • Pin compatible with the 20A - TPS543B22, 16A - TPS543A26, and 12A - TPS543A22
  • Create a custom design using the TPS543B25T with the WEBENCH Power Designer
  • Integrated 6.5mΩ and 2mΩ MOSFETs
  • 4V to 18V input voltage range
  • Fixed-frequency, internally compensated, advanced current mode (ACM) control
  • 0.5V to 7V output voltage range
  • True differential remote sense amplifier (RSA)
  • Three selectable PWM ramp options to optimize the control loop performance
  • Five selectable switching frequencies: 500kHz, 750kHz, 1MHz, 1.5MHz, and 2.2MHz
  • Synchronizable to an external clock
  • 0.5V, ±0.5% voltage reference accuracy over full temperature range
  • 1ms, 2ms, 4ms, and 8ms selectable soft-start times
  • Monotonic start-up into prebiased outputs
  • Selectable current limits to support 25A and 20A operation
  • Enable with adjustable input undervoltage lockout
  • Power-good output monitor
  • Output overvoltage, output undervoltage, input undervoltage, overcurrent, and overtemperature protection
  • –40°C to 150°C operating junction temperature
  • 2.5mm × 4.5mm, 17-pin WQFN-HR package with 0.5mm pitch
  • Lead-free (RoHS compliant), Lead-free (Pb-free) conversion
  • Pin compatible with the 20A - TPS543B22, 16A - TPS543A26, and 12A - TPS543A22
  • Create a custom design using the TPS543B25T with the WEBENCH Power Designer

Description

The TPS543B25T is a high-efficiency, 18V, 25A, synchronous buck converter employing an internally compensated, fixed-frequency advanced current mode (ACM) control architecture, which while always operating under FCCM, generates output voltages from 0.5V to 7V. The device is capable of providing high efficiency while operating at a switching frequency up to 2.2MHz, making the device an excellent choice for designs requiring a small design size. The fixed frequency controller can operate from 500kHz to 2.2MHz and can be synchronized to an external clock using the SYNC pin. Additional features include a high accuracy voltage reference, two-wire remote sense, selectable soft-start times, monotonic start-up into prebiased outputs, selectable current limits, adjustable UVLO through the EN pin, and a full suite of fault protections.

The TPS543B25T is available in a small 2.5mm × 4.5mm HotRod™ WQFN-FCRLF package.

The TPS543B25T is a high-efficiency, 18V, 25A, synchronous buck converter employing an internally compensated, fixed-frequency advanced current mode (ACM) control architecture, which while always operating under FCCM, generates output voltages from 0.5V to 7V. The device is capable of providing high efficiency while operating at a switching frequency up to 2.2MHz, making the device an excellent choice for designs requiring a small design size. The fixed frequency controller can operate from 500kHz to 2.2MHz and can be synchronized to an external clock using the SYNC pin. Additional features include a high accuracy voltage reference, two-wire remote sense, selectable soft-start times, monotonic start-up into prebiased outputs, selectable current limits, adjustable UVLO through the EN pin, and a full suite of fault protections.

The TPS543B25T is available in a small 2.5mm × 4.5mm HotRod™ WQFN-FCRLF package.

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