5.5V to 36V Input, 3A, 500kHz Step-Down Converter

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 5.5V; 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 15µA typically. Other features include an

active-high enable, overcurrent limiting, overvoltage 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 23V. The TPS5430 regulates a wide variety of power sources

including 24V bus.

The TPS543x device is available in a

thermally enhanced, easy to use 8-pin SOIC PowerPAD integrated circuit 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.