TPS56121_16 Datasheet, PDF (1/31 Pages) Texas Instruments – Input High-Current Synchronous Buck SWIFT Converter

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TPS56121
SLUSAH4D – MARCH 2011 – REVISED FEBRUARY 2016
TPS56121 4.5-V to 14-V Input High-Current Synchronous Buck SWIFT™ Converter
1 Features
•1 4.5-V to 14-V Input Voltage Range
• Incorporates Power Block Technology
• Up to 15-A Output Current
• Fixed-Frequency Options of 300 kHz, 500 kHz,
and 1 MHz
• High-Side and Low-Side MOSFET R_DS(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 x 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 TPS56121 device is a high-efficiency and high-
current synchronous buck converter designed to
operate from a supply of 4.5 V to 14 V. The device
can produce an output voltage as low as 0.6 V at
loads up to 15 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 TPS56121 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
and then enters a shutdown/restart cycle until the
fault is removed.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS56121
LSON-CLIP (22)
6.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Application
V
OUT
TPS56121
FB
VIN
V
IN
COMP BOOT
PGD
SW
EN/SS
ILIM
V
OUT
V_IN
VDD
BP
GND
SD
UDG-11047
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.