TPS5420_15 Datasheet, PDF (1/27 Pages) Texas Instruments – 2-A, WIDE INPUT RANGE, STEP-DOWN CONVERTER

TPS5420
www.ti.com
SLVS642E – APRIL 2006 – REVISED SEPTEMBER 2013
2-A, WIDE INPUT RANGE, STEP-DOWN CONVERTER
Check for Samples: TPS5420
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 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
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
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 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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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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.
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