NCP5351

The NCP5351 is a dual MOSFET gate driver optimized to drive the gates of both high−side and low−side Power MOSFETs in a Synchronous Buck converter.

The NCP5351 is an excellent companion to multiphase controllers that do not have integrated gate drivers, such as ON Semiconductor's CS5323, CS5305 or CS5307. This architecture provides a power supply designer the flexibility to locate the gate drivers close to the MOSFETs. The 4.0 A drive capability makes the NCP5351 ideal for minimizing switching losses in MOSFETs with large input capacitance. Optimized internal, adaptive nonoverlap circuitry further reduces switching losses by preventing simultaneous conduction of both MOSFETs.

The floating top driver design of NCP5351 can accommodate MOSFET drain voltages as high as 25 V. Both gate outputs can be driven low, and supply current reduced to less than 25 A, by applying a low logic level to the Enable (EN) pin. An undervoltage lockout function ensures that both driver outputs are low when the supply voltage is low, and a thermal shutdown function provides the IC with overtemperature protection.

The NCP5351 is pin−to−pin compatible with the SC1205 and is available in a standard SO−8 package and thermally enhanced QFN−10.