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 (TPS54538), 4A (TPS54438), 3A

(TPS54338) 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 electromagnetic interference (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 TPS54x38 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 TPS54x38 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 TPS54x38 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.

TPS54x38 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.