TPS5420-Q1_15 Datasheet, PDF (1/25 Pages) Texas Instruments – 2-A WIDE-INPUT-RANGE STEP-DOWN SWIFT™ CONVERTER

TPS5420-Q1
www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008
2-A WIDE-INPUT-RANGE STEP-DOWN SWIFT™ CONVERTER
FEATURES
1
•2 Qualified for Automotive Applications
• 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 Over Current Limiting,
Over Voltage Protection, 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
• Industrial and Car Audio Power Supplies
• Battery Chargers, High-Power LED Supplies
• 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 limiting, overvoltage 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.
Simplified Schematic
Efficiency vs Output Current
VIN
VIN
PH
TPS5420
NC BOOT
NC
ENA VSENSE
GND
VOUT
100
95
90
85
80
V_I = 12 V
75
70
65
60
55
50
0 0.5 1 1.5 2 2.5 3
IO - Output Current - A
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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.
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 © 2007–2008, Texas Instruments Incorporated