TPS5430 Step-Down Converter: Pinout, Equivalent and Datasheet

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The TPS5430 is a 3-A, step-down (buck) regulator with an integrated high-side n-channel MOSFET. The TPS5430 is a high-output-current PWM converter that integrates a low-resistance, high-side N-channel MOSFET. The TPS5430 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. The TPS5430 includes an internal slow-start circuit that slows the output rise time during start up to reduce in rush current and output voltage overshoot. This article provides you with a basic overview of the TPS5430, including its pin descriptions, features and specifications, etc., to help you quickly understand what TPS5430 is.

• 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

The TPS5430 regulates a wide variety of power sources including 24 V bus. The TPS5431 is intended to operate from power rails up to 23 V and the TPS5430 up to 36 V. These devices implement constant-frequency voltage-mode control with voltage feed forward for improved line regulation and line transient response. Internal compensation reduces design complexity and external component count. The integrated 110-mΩ high-side MOSFET supports high-efficiency power-supply designs capable of delivering 3-A of continuous current to a load. The gate-drive bias voltage for the integrated high-side MOSFET is supplied by a bootstrap capacitor connected from the BOOT to PH pins. The TPS5430 reduces the external component count by integrating the bootstrap recharge diode.

The TPS5430 has a default input start-up voltage of 5.3 V typical. The ENA pin can be used to disable the TPS5430 reducing the supply current to 18 µA. An internal pullup current source enables operation when the ENA pin is floating. The TPS5430 includes an internal slow-start circuit that slows the output rise time during start up to reduce in rush current and output voltage overshoot. The minimum output voltage is the internal 1.221-V feedback reference. Output overvoltage transients are minimized by an Overvoltage Protection (OVP) comparator. When the OVP comparator is activated, the high-side MOSFET is turned off and remains off until the output voltage is less than 112.5% of the desired output voltage. Internal cycle-by-cycle overcurrent protection limits the peak current in the integrated high-side MOSFET. For continuous overcurrent fault conditions the TPS5430 will enter hiccup mode overcurrent limiting. Thermal protection protects the device from overheating.

Texas Instruments TPS5430DDAG4 technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments TPS5430DDAG4.

Functional Block Diagram

Simplified Schematic

Pin Functions

• 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

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