TPS5450 Datasheet, PDF (1/20 Pages) Texas Instruments – 5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT CONVERTER

TPS5450
www.ti.com
SLVS757 – MARCH 2007
5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER
FEATURES
• 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 www.ti.com/swift
APPLICATIONS
• 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.
Simplified Schematic
Efficiency vs Output Current
VIN
VIN
PH
NC BOOT
NC
ENA VSENSE
GND
VOUT
100
95
90
85
80
75
70
65
60
55
50
0
V_I = 12 V,
V_O = 5 V,
f_s = 500 kHz,
T_A = 25°C
1
2
3
4
5
6
I_O - Output Current - A
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