1 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

2 Applications

? Wireless and wired communications infrastructure

equipment

? Optical and fiber networks

? Test and measurement

? Medical and healthcare

3 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.