The MP3421 is a high-efficiency, synchronous, current–mode, step-up converter with true output disconnect.
The MP3421 starts up from low input voltage (as low as 1.9V) while providing in-rush current limiting and output short-circuit protection. The integrated, P-channel synchronous rectifier improves efficiency and eliminates the need for an external Schottky diode; the P-channel disconnects the output load from the input during shutdown.
The MP3421 has 600kHz switching frequency, which accommodates small external components. In addition, its internal compensation and soft-start functions minimize external component count. The MP3421 provides a compact solution for a 5V output, 2.1A load requirement, using a supply voltage as low as 2.8V.
The MP3421 is available in a 14-pin QFN 2mmx2mm package.