The FPF1320/21 is a Dual−Input Single−Output (DISO) load switch consisting of two sets of slew−rate controlled, low on−resistance, P−channel MOSFET switches and integrated analog features. The slew−rate−controlled turn−on characteristic prevents inrush current and the resulting excessive voltage droop on the power rails. The input voltage range operates from 1.5 V to 5.5 V to align with the requirements of low−voltage portable device power rails. FPF1320/21 performs seamless power−source transitions between two input power rails using the SEL pin with advanced break−before−make operation. FPF1320/21 has a TRCB function to block unwanted reverse current from output to input during ON/OFF states. The switch is controlled by logic inputs of the SEL and EN pins, which are capable of interfacing directly with low−voltage control signals (GPIO). FPF1321 has 65 on−chip load resistor for output quick discharge when EN is LOW. FPF1320/21 is available in 1.0 mm x 1.5 mm WLCSP, 6−bump, with 0.5 mm pitch. FPF1321B is available in 1.0 mm x 1.5 mm WLCSP, 6−bump, 0.5 mm pitch with backside laminate.
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