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The TPS54531 device is a 28V, 5A non-synchronous step-down converter that integrates a low RDS(onhigh-side MOSFET.

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The TPS54531 device is a 28V, 5A non-synchronous step-down converter that integrates a low RDS(onhigh-side MOSFET. The device will automatically activate the pulse skip Eco-mode function at light load to improve efficiency. In addition, the 1μA shutdown supply current makes the device suitable for battery-powered applications. Current mode control with internal slope compensation simplifies external compensation calculations and reduces the number of components while allowing the use of ceramic output capacitors. A resistor divider sets the delay time of the input undervoltage lockout. The overvoltage transient protection circuit limits the voltage overshoot during startup and transients. The cycle-by-cycle current limit mechanism, frequency foldback, and thermal shutdown feature protect the device and load under overload conditions. The TPS54531 device adopts an 8-pin SO PowerPADTM package, which has been optimized internally to improve the heat dissipation performance.


• Input voltage range: 3.5V to 28V

• Adjustable output voltage as low as 0.8V

• Integrated 80mΩ high-side metal oxide semiconductor field effect transistor (MOSFET) supports continuous output voltage up to 5A

• High efficiency Ecomode™ on light load conditions with pulse skipping

• 570kHz fixed switching frequency

• Typical turn-off quiescent current of 1μA

• Adjustable slow start can limit inrush current

• Programmable undervoltage lockout (UVLO) threshold

• Overvoltage transient protection

• Cycle-by-cycle current limit, frequency foldback and thermal shutdown protection

• Available in an easy-to-use thermally enhanced 8-pin SO PowerPADTM package


• Consumer applications, such as set-top boxes, CPE devices, LCD displays, peripherals, and battery chargers

• Industrial and car audio power supply

• 5V, 12V and 24V distributed power system

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