1 Features

• Configured for a wide range of applications

– 3.8V to 28V input voltage range

– 0.6V to 22V output voltage range

– Up to 5A continuous output current

– 0.6V ±1% reference voltage (–40°C to 150°C)

– 70ns and 114ns minimum switching on and offtime

– 8us maximum switching on-time

– 98% maximum duty cycle

• High efficiency

– Integrated 47mΩ and 21mΩ MOSFETs

– Low quiescent current of 28uA (typical)

• Ease of use and small design size

– Peak current control mode with internal

compensation

– 200kHz to 2.2MHz selectable frequency

– Synchronizable to an external clock (support

phase shift) : 200kHz to 2.2MHz

– Selectable PFM / FCCM at light load condition

– Selectable adjustable soft-start time, powergood

indicator function

– Good EMI performance with frequency spread

spectrum and optimized pinout

– Hiccup OC limit for both high-side and low-side

MOSFETs

– Non-latched protections for OTP, OCP, OVP,

UVP, and UVLO

– Integrated bootstrap capacitor to support

single-layer PCB layout

– –40°C to 150°C operating junction temperature

– 1.5mm × 2.0mm QFN package

• Create a custom design with the TPS54538 using

the WEBENCH® Power Designer

2 Applications

• Medical and healthcare, building automation, test

and measurement

• Multifunction printers, enterprise projectors

• Portable electronics, connected peripherals

• Wired networking, wireless infrastructure

• Distributed power systems with 5V, 12V, 19V, and

24V input

3 Description

The TPS54538 is a high efficiency, high voltage

input, and easy-to-use synchronous buck converter

with high design flexibility. With the wide operating

input voltage range of 3.8V to 28V, the TPS54538

is designed for systems powered from 5V, 12V,

19V, 24V power-bus rails. The device supports up

to 5A/4A/3A continuous output current and 98%

maximum duty cycle.

TPS54538 uses fixed frequency peak current control

with internal compensation for fast transient response

and good line and load regulation. With the optimized

internal loop compensation, the device eliminates the

need for external compensation over a wide output

voltage range and switching frequency. Integrated

bootstrap capacitor helps achieve single layer PCB

and reduce external component count.