1 Features

• Configured for a wide range of applications

– 3.8V to 18V input voltage range

– 0.6V to 9V output voltage range

– Up to 5A continuous output current

– 0.6V ±1% reference voltage (–40°C to 125°C)

– Low quiescent current of 28uA (typical)

– 70ns, 114ns minimum switching on, off-time

– 8us maximum switching on-time

– 98% maximum duty cycle

• 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,

power-good indicator function

– Good EMI performance with frequency spread

spectrum and optimized pinout

– Hiccup overcurrent (OC) limit for both high-side

and low-side MOSFETs

– Non-latched protections for overtemperature

protection (OTP), overcurrent protection (OCP),

overvoltage protection (OVP), undervoltage

protection (UVP), and undervoltage lockout

(UVLO)

– Integrated bootstrap capacitor and inductor to

support easy PCB layout

– Operating junction temperature of –40°C to

125°C

– 3.3mm × 4.5mm × 2mm QFN package

• Create a custom design with the TPSM843521

using the WEBENCH® Power Designer

2 Applications

• Medical and healthcare

• Test and measurement

• Building automation

• Wired networking, wireless infrastructure

• Distributed power systems with 5V and 12V input

3 Description

The TPSM843521 is a high-efficiency, high-power

density, and easy-to-use, synchronous buck power

module with high design flexibility. With operating

input voltage ranging from 3.8V to 18V, the

TPSM843521 is designed for systems powered from

5V, 12V power-bus rails. The device supports up to

5A continuous output current and 98% maximum duty

cycle.

TPSM843521 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.