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.
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The EV3421-G-00A evaluation board is designed to demonstrate the capability of the MP3421. The MP3421 is a high-efficiency, synchronous, current mode, step-up converter with output disconnect.
The MP3421 can provide inrush current limiting and output short-circuit protection. It can work with an input voltage as low as 1.9V. The integrated P-channel synchronous rectifier improves efficiency and eliminates the need for an external Schottky diode. The PMOS disconnects the output from the input when the part shuts down.
The 600kHz switching frequency allows for small external components, while the internal compensation and soft start minimize the external component count. The MP3421 is available in a QFN-14 (2mmx2mm) package.