TPS5430_15 Datasheet, PDF (1/36 Pages) Texas Instruments – TPS543x 3-A, Wide Input Range, Step-Down Converter

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TPS5430, TPS5431
SLVS632G – JANUARY 2006 – REVISED FEBRUARY 2015
TPS543x 3-A, Wide Input Range, Step-Down Converter
1 Features
•1 Wide Input Voltage Range:
– TPS5430: 5.5 V to 36 V
– TPS5431: 5.5 V to 23 V
• Up to 3-A Continuous (4-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,
Overvoltage Protection and Thermal Shutdown
• –40°C to 125°C Operating Junction Temperature
Range
• Available in Small Thermally Enhanced 8-Pin SO
PowerPAD™ Package
2 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
3 Description
The TPS543x 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, over-voltage
protection and thermal shutdown. To reduce design
complexity and external component count, the
TPS543x feedback loop is internally compensated.
The TPS5431 is intended to operate from power rails
up to 23 V. The TPS5430 regulates a wide variety of
power sources including 24 V bus.
The TPS543x device is available in a thermally
enhanced, easy to use 8-pin SOIC PowerPAD™
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
INPUT VOLTAGE
TPS5430
TPS5431
HSOP (8)
5.5 V to 36 V
5.5 V to 23 V
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Simplified Schematic
VIN
VIN
PH
TPS5430/31
NC BOOT
NC
ENA VSENSE
GND
VOUT
Efficiency vs Output Current
100
95
90
85
80
75
70
65
V_I = 12 V
V_O = 5 V
60
f_s = 500 kHz
55
T_A = 25^oC
50
0 0.5 1 1.5 2 2.5 3 3.5
IO - Output Current - A
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.