TPS54332_15 Datasheet, PDF (1/34 Pages) Texas Instruments – TPS54332 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With Eco-Mode™

Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
TPS54332
SLVS875C – JANUARY 2009 – REVISED NOVEMBER 2014
TPS54332 3.5-A, 28-V, 1-MHz, Step-Down DC-DC Converter With Eco-Mode™
1 Features
•1 3.5-V to 28-V Input Voltage Range
• Adjustable Output Voltage Down to 0.8 V
• Integrated 80-mΩ High-Side MOSFET Supports
up to 3.5-A Continuous Output Current
• High Efficiency at Light Loads With a Pulse-
Skipping Eco-Mode™
• Fixed 1-MHz Switching Frequency
• Typical 1-μA Shutdown Quiescent Current
• Adjustable Slow-Start Limits Inrush Currents
• Programmable UVLO Threshold
• Overvoltage Transient Protection
• Cycle-by-Cycle Current Limit, Frequency Foldback
and Thermal Shutdown Protection
• Available in Thermally Enhanced 8-Pin SOIC
PowerPAD™ Package
• Supported by WEBENCH™ Tool
(http://www.ti.com/lsds/ti/analog/webench/overvie
w.page)
2 Applications
• Consumer Applications such as Set-Top Boxes,
CPE Equipment, LCD Displays, Peripherals, and
Battery Chargers
• Industrial and Car Audio Power Supplies
• 5-V, 12-V and 24-V Distributed Power Systems
3 Description
The TPS54332 is a 28-V, 3.5-A non-synchronous
buck converter that integrates a low-R_DS(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 undervoltage lockout. An overvoltage
transient protection circuit limits voltage overshoots
during start-up and transient conditions. A cycle-by-
cycle current limit scheme, frequency foldback 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.
Device Information⁽¹⁾
PART NUMBER PACKAGE
BODY SIZE (NOM)
TPS54332
SO PowerPAD (8) 4.90 mm × 3.90 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
Ren1
Ren2
EN
VIN
TPS54332
BOOT
PH
SS
COMP
C_SS
C₁
C₂
R₃
VSENSE
GND
VIN
C_I
C_BOOT
L_O
D1
C_O
VOUT
R_O1
R_O2
Efficiency
100
V_O = 2.5 V
95
90
85
V_I = 5 V
V_I = 12 V
80
75
V_I = 15 V
70
65
60
0 0.5 1 1.5 2 2.5 3 3.5
I_O - Output Current - A
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.