Description：

The TPS543x is a high-output-current PWM converterthat integrates a low-resistance, high-side N-channelMOSFET. Included on the substrate with thelisted features are a high-performance voltageerror amplifier that provides tight voltage regulationaccuracy under transient conditions; an undervoltagelockout circuit to prevent start-up until the inputvoltage reaches 5.5V; an internally set slow-startcircuit to limit inrush currents; and a voltage feedforward circuit to improve the transient response.Using the ENA pin, shutdown supply current isreduced to 15μA typically. Other features include anactive-high enable, overcurrent limiting, overvoltageprotection and thermal shutdown. To reduce designcomplexity and external component count, theTPS543x feedback loop is internally compensated.The TPS5431 is intended to operate from power railsup to 23V. The TPS5430 regulates a wide variety ofpower sources including 24V bus.The TPS543x device is available in a thermallyenhanced, easy to use 8-pin SOIC PowerPADintegrated circuit package. TI provides evaluationmodules and the Designer software tool to aid inquickly achieving high-performance power supplydesigns to meet aggressive equipment developmentcycles.

 Features：

• Wide input voltage range:

– TPS5430: 5.5V to 36V

– TPS5431: 5.5V to 23V

• Up to 3A continuous (4A peak) output current

• High efficiency up to 95% enabled by 100mΩintegrated MOSFET switch

• Wide output voltage range: adjustable down to1.22V with 1.5% initial accuracy

• Internal compensation minimizes external partscount

• Fixed 500kHz switching frequency for small filtersize

• Improved line regulation and transient response byinput voltage feedforward

• System protected by overcurrent limiting,overvoltage protection, and thermal shutdown

• –40°C to 125°C operating junction temperaturerange

• Available in small thermally enhanced 8-pin SOPowerPAD™ integrated circuit package

• Create a custom design using the TPS5430 with the WEBENCH® Power Designer

Applications：

• Consumer: set-top box, DVD, LCD displays

• Industrial and car audio power supplies

• Battery chargers, high-power LED supply

• 12V and 24V distributed power systems