3-A Wide-Input-Range Step-Down Converter - Texas Instruments
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TPS5430-Q1
SLVS751D – NOVEMBER 2007 – REVISED JULY 2015
TPS5430-Q1 3-A Wide-Input-Range Step-Down Converter
1 Features
•1 Qualified for Automotive Applications • Wide Input Voltage Range: 5.
5 V to 36 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
SOIC PowerPAD™ Package
2 Applications
• Car Audio Power Supplies • High-Power LED Supplies, Battery Chargers • 12-V and 24-V Supplied Systems
3 Description
The TPS5430-Q1 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 (UVLO) circuit to prevent start-up until the input voltage reaches 5.
5 V, an internally set slowstart circuit to limit inrush currents, and a voltage feed-forward circuit to improve the transient response.
Using the enable (ENA) pin, shutdown supply current is reduced to 18 μA typically.
Other features include an active-high enable, overcurrent limiting, overvoltage protection (OVP), and thermal shutdown.
To reduce design complexity and external component count, the TPS5430-Q1 feedback loop is internally compensated.
The TPS5430-Q1 regulates a wide variety of power sources including 24-V buses.
The TPS5430-Q1 device is available in a thermally e...
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