TPS54332
www.ti.com
SLVS875B –JANUARY 2009–REVISED FEBRUARY 2012
3.5A, 28V, 1MHz, STEP DOWN DC/DC CONVERTER WITH Eco-mode™
Check for Samples: TPS54332
1
FEATURES
APPLICATIONS
2
•
•
•
3.5V to 28V Input Voltage Range
•
Consumer Applications such as Set-Top
Boxes, CPE Equipment, LCD Displays,
Peripherals, and Battery Chargers
Adjustable Output Voltage Down to 0.8V
Integrated 80 mΩ High Side MOSFET Supports
up to 3.5A Continuous Output Current
•
•
Industrial and Car Audio Power Supplies
5V, 12V and 24V Distributed Power Systems
•
High Efficiency at Light Loads with a Pulse
Skipping Eco-mode™
DESCRIPTION
•
•
•
•
•
•
Fixed 1MHz Switching Frequency
The TPS54332 is a 28 V, 3.5 A non-synchronous
buck converter that integrates a low RDS(on) high side
MOSFET. To increase efficiency at light loads, a
pulse skipping Eco-mode™ feature is automatically
activated. Furthermore, the 1 μA shutdown supply
current allows the device to be used in battery
powered applications. Current mode control with
internal slope compensation simplifies the external
compensation calculations and reduces component
count while allowing the use of ceramic output
capacitors. A resistor divider programs the hysteresis
of the input under-voltage lockout. An overvoltage
transient protection circuit limits voltage overshoots
during startup and transient conditions. A cycle by
cycle current limit scheme, frequency fold back and
thermal shutdown protect the device and the load in
the event of an overload condition. The TPS54332 is
available in an 8-pin SOIC PowerPAD™ package.
Typical 1μA Shutdown Quiescent Current
Adjustable Slow Start Limits Inrush Currents
Programmable UVLO Threshold
Overvoltage Transient Protection
Cycle by Cycle Current Limit, Frequency Fold
Back and Thermal Shutdown Protection
•
•
Available in Thermally Enhanced 8-Pin SOIC
PowerPAD™ Package
Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
SIMPLIFIED SCHEMATIC
EFFICIENCY
100
Ren1
V
= 2.5 V
O
95
90
85
80
EN
VIN
CI
VIN
V = 5 V
Ren2
I
V = 12 V
I
TPS54332
CBOOT
BOOT
PH
LO
VOUT
75
70
65
60
V = 15 V
SS
I
CO
D1
RO1
COMP
C1
R3
CSS
C2
VSENSE
GND
0
0.5
1
1.5
2
2.5
3
3.5
RO2
I
- Output Current - A
O
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
Eco-mode, PowerPAD, SwitcherPro are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2012, Texas Instruments Incorporated