Triple-Channel Synchronous Rectified Buck MOSFET Driver

The RT9629A is a high frequency, triple-channel synchronous rectified buck MOSFET driver specifically designed to drive six power N-MOSFETs. The part is promoted to pair with Richtek's multiphase buck PWM controller family for high-density power supply implementation. The output drivers of RT9629A can efficiently switch power MOSFETs at frequency 300kHz typically. Operating in higher frequency should consider the thermal dissipation carefully. The device implements bootstrapping on the upper gate with only an external capacitor and a diode required. This reduces circuit complexity and allows the use of higher performance, cost effective N-MOSFETs. All drivers incorporate adaptive shoot-through protection to prevent upper and lower MOSFETs from conducting simultaneously and shorting the input supply. The RT9629A has also detected the fault condition during initial start-up before the multi-phase PWM controller takes control. As a result, the input supply will latch into the shutdown state. The RT9629A comes in a small footprint package with WQFN-24L 5x5 package.