www.ti.com
SLVS757 – MARCH 2007
5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER
FEATURES
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Wide Input Voltage Range: 5.5 V to 36 V
Up to 5-A Continuous (6-A Peak) Output
Current
High Efficiency Greater than 90% Enabled by
110-mΩ Integrated MOSFET Switch
Wide Output Voltage Range: Adjustable Down
to 1.22 V with 1.5% Initial Accuracy
Internal Compensation Minimizes External
Parts Count
Fixed 500 kHz Switching Frequency for Small
Filter Size
18
µA
Shut Down Supply Current
Improved Line Regulation and Transient
Response by Input Voltage Feed Forward
System Protected by Overcurrent Limiting,
Overvoltage Protection and Thermal
Shutdown
–40°C to 125°C Operating Junction
Temperature Range
Available in Small Thermally Enhanced 8-Pin
SOIC PowerPAD™ Package
For SWIFT™ Documentation, Application
Notes and Design Software, See the TI
Website at
APPLICATIONS
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High Density Point-of-Load Regulators
LCD Displays, Plasma Displays
Battery Chargers
12-V/24-V Distributed Power Systems
DESCRIPTION
As a member of the SWIFT™ family of DC/DC
regulators, the TPS5450 is a high-output-current
PWM converter that integrates a low resistance high
side N-channel MOSFET. Included on the substrate
with the listed features are a high performance
voltage error amplifier that provides tight voltage
regulation accuracy under transient conditions; an
undervoltage-lockout circuit to prevent start-up until
the input voltage reaches 5.5 V; an internally set
slow-start circuit to limit inrush currents; and a
voltage feed-forward circuit to improve the transient
response. Using the ENA pin, shutdown supply
current is reduced to 18
µA
typically. Other features
include an active-high enable, overcurrent limiting,
overvoltage protection and thermal shutdown. To
reduce design complexity and external component
count, the TPS5450 feedback loop is internally
compensated.
The TPS5450 device is available in a thermally
enhanced, 8-pin SOIC PowerPAD™ package. TI
provides evaluation modules and software tool to aid
in achieving high-performance power supply designs
to meet aggressive equipment development cycles.
Efficiency vs Output Current
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Simplified Schematic
VIN
VOUT
VIN
PH
95
90
NC
NC
Efficiency - %
BOOT
85
80
75
70
65
60
55
50
0
1
2
3
4
5
I
O
- Output Current - A
6
V
I
= 12 V,
V
O
= 5 V,
f
s
= 500 kHz,
T
A
= 25°C
ENA VSENSE
GND
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, PowerPAD 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 © 2007–, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
