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.