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SLVS642A – APRIL 2006 – REVISED AUGUST 2006
2-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 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
APPLICATIONS
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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.
SIMPLIFIED SCHEMATIC
Efficiency vs Output Current
VIN
VIN
PH
VOUT
100
95
90
85
TPS5420
NC
NC
ENA VSENSE
GND
BOOT
Eficiency − %
f
V
I
= 12 V
80
75
70
65
60
55
50
0
0.5
1
1.5
2
I − Output Current A
−
O
2.5
3
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
TI [ TEXAS INSTRUMENTS ]
