The TPS5420 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 is 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 5.5 V; 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 18 µA
typically. Other features include an active-high enable, overcurrent limiting, overvoltage
protection and thermal shutdown. To reduce design complexity and external component count, the
TPS5420 feedback loop is internally compensated.
The TPS5420 device is available in an easy to use 8-pin SOIC 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.
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