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TPS54331的详细信息
Feature: | 3.5V to 28V Input, 3A, 570kHz Step-Down Converter with Eco-mode |
---|
SLVS839D –JULY 2008–REVISED JANUARY 2012
Check for Samples: TPS54331
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 3A 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 570kHz Switching Frequency
Typical 1μA Shutdown Quiescent Current
Adjustable Slow Start Limits Inrush Currents
Programmable UVLO Threshold
The TPS54331 is a 28-V, 3-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 TPS54331 is
available in 8-pin SOIC package and 8-pin SOIC
PowerPADTM package that have been internally
optimized to improve thermal performance.
Overvoltage Transient Protection
Cycle-by-Cycle Current Limit, Frequency Fold
Back and Thermal Shutdown Protection
•
•
•
Available in Easy-to-Use SOIC8 Package or
Thermally Enhanced SOIC8 PowerPADTM
Package
Website at www.ti.com/swift
SIMPLIFIED SCHEMATIC
Figure 1. EFFICIENCY
TPS54331D
Ren1
100
90
EN
VIN
CI
VIN
Ren2
TPS54331D
80
V
=12V
CBOOT
I
70
60
BOOT
PH
V
=18V
LO
I
V
=24V
V
I
OUT
V
=28V
I
50
40
SS
COMP
CO
D1
RO1
V =5V
I
C1
R3
30
20
10
0
CSS
C2
VSENSE
GND
RO2
V
1
=3.3V
O
0.01
0.1
10
I
-LoadCurrent- A
L
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.
SWIFT, Eco-mode, SwitcherPro, PowerPAD are trademarks of Texas Instruments.
2
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 © 2008–2012, Texas Instruments Incorporated
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