TPS5420 Datasheet, PDF (1/20 Pages) Texas Instruments – 2-A, WIDE INPUT RANGE, STEP-DOWN SWIFT CONVERTER

TPS5420
www.ti.com
SLVS642A – APRIL 2006 – REVISED AUGUST 2006
2-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER
FEATURES
• Wide Input Voltage Range: 5.5 V to 36 V
• Up to 2-A Continuous (3-A Peak) Output
Current
• High Efficiency up to 95% 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
• Improved Line Regulation and Transient
Response by Input Voltage Feed Forward
• System Protected by Overcurrent Limiting
and Thermal Shutdown
• –40°C to 125°C Operating Junction
Temperature Range
• Available in Small 8-Pin SOIC Package
• For SWIFT Documentation, Application Notes
and Design Software, See the TI Website at
www.ti.com/swift
APPLICATIONS
• Consumer: Set-top Box, DVD, LCD Displays
• Industrial and Car Audio Power Supplies
• Battery Chargers, High Power LED Supply
• 12-V/24-V Distributed Power Systems
DESCRIPTION
As a member of the SWIFT™ family of DC/DC
regulators, the TPS5420 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 is 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 protection
and thermal shutdown. To reduce design complexity
and external component count, the TPS5420
feedback loop is internally compensated.
The TPS5420 device is available in an easy to use
8-pin SOIC package. TI provides evaluation modules
and the SWIFT™ Designer software tool to aid in
quickly achieving high-performance power supply
designs to meet aggressive equipment development
cycles.
VIN
VIN
PH
TPS5420
NC BOOT
NC
ENA VSENSE
GND
SIMPLIFIED SCHEMATIC
VOUT
100
95
Efficiency vs Output Current
90
85
V_I = 12 V
80
75
70
65
60
55
50
0
0.5
1
1.5
2
2.5
3
IO − 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 is a trademark 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 © 2006, Texas Instruments Incorporated