1 Features

? Fixed-frequency, internally compensated,

advanced current mode (ACM) control

? Integrated 6.5-mΩ and 2-mΩ MOSFETs

? 4-V to 18-V input voltage range

? 0.5-V to 7-V output voltage range

? True differential remote sense amplifier (RSA)

? Three selectable PWM ramp options to optimize

the control loop performance

? Five selectable switching frequencies: 500 kHz,

750 kHz, 1 MHz, 1.5 MHz, and 2.2 MHz

? Synchronizable to an external clock

? 0.5 V, ±0.5 voltage reference accuracy over full

temperature range

? 1-ms, 2-ms, 4-ms, and 8-ms selectable soft-start

times

? Monotonic start-up into prebiased outputs

? Selectable current limits to support 25-A and 20-A

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

? 2.5-mm × 4.5-mm, 17-pin WQFN-HR package with

0.5-mm pitch

? Lead-free (RoHS compliant)

? Pin compatible with the 20 A-TPS543B22 , 16 ATPS543A26

and 12 A-TPS543A22

? WEBENCH? and SIMPLIS models available

2 Applications

? Wireless and wired communications infrastructure

equipment

? Optical and fiber networks

? Test and measurement

? Medical and healthcare

3 Description

The TPS543B25 is a high-efficiency 18-V, 25-A

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 0.5 V to 7 V. The device is capable of

providing high efficiency while operating at a switching

frequency up to 2.2 MHz, making it optimal for

designs requiring a small solution size. The fixed

frequency controller can operate from 500 kHz to

2.2 MHz 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 startup

into prebiased outputs, selectable current limits,

adjustable UVLO through the EN pin, and a full suite

of fault protections.

The TPS543B25 is available in a small 2.5-mm × 4.5-

mm HotRod? WQFN-FCRLF package.