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1 Features

1? 4.5-V to 14-V Input Voltage Range

? Incorporates Power Block Technology

? Up to 25-A Output Current

? Fixed-Frequency Options of 300 kHz, 500 kHz,

and 1 MHz

? High-Side and Low-Side MOSFET RDS(on) Sensing

? Programmable Soft-Start

? 600-mV Reference Voltage With 1% Accuracy

? Voltage Mode Control with Feed-Forward

? Supports Prebiased Output

? Thermal Shutdown

? 22-Pin 5-mm × 6-mm PQFN PowerPAD?

Package

? For SWIFT? Power Products Documentation,

see http://www.ti.com/swift

2 Applications

? Point-of-Load (POL) Power Modules

? High-Density DC-DC Converters for Telecom and

Networking Applications

3 Description

The TPS56221 device is a high-efficiency and highcurrent

synchronous buck converter designed to

operate from a supply from 4.5 V to 14 V. The device

can produce an output voltage as low as 0.6 V at

loads up to 25 A. Integrated NexFET? Power

MOSFETs provide a small footprint and ease of use.

The device implements a voltage-mode control with

voltage feed-forward compensation that responds

instantly to input voltage change.

The TPS56221 is available in a thermally enhanced

22-pin PQFN (DQP) PowerPAD package.

The device offers design flexibility with a variety of

user programmable functions, including soft-start,

overcurrent protection (OCP) levels, and loop

compensation. OCP levels are programmed by a

single external resistor connected from the ILIM pin to

the circuit ground. During the initial power-on

sequence, the device enters a calibration cycle,

measures the voltage at the ILIM pin, and sets an

internal OCP voltage level. During operation, the

programmed OCP voltage level is compared to the

voltage drop across the low-side FET when it is on to

determine whether there is an overcurrent condition.

It then enters a shutdown/restart cycle until the fault

is removed.