资 源 简 介
The RT9618/A is a high frequency, dual MOSFET driverspecifically designed to drive two power N-ChannelMOSFETs in a synchronous-recTIfied buck convertertopology. This driver combined with Richtek’ s series ofMulTI-Phase Buck PWM controller form a complete corevoltageregulator soluTIon for advanced micro-processors.The RT9618/A drives both the lower/upper gate in asynchronous-recTIfier bridge with 12V. This drive-voltageflexibility provides the advantage of optimizing applicationsinvolving trade-offs between switching losses andconduction losses.RT9618A has longer UGATE/LGATE deadtime which candrive the MOSFETs with large gate RC value, avoiding theshoot-through phenomenon. RT9618 is targeted to drivelow gate RC MOSFETs and performs better efficiency.The output drivers in the RT9618/A can efficiently switchpower MOSFETs at frequency up to 500kHz. Switchingfrequency above 500kHz has to take into account thethermal dissipation of SOP-8 package. RT9618/A iscapable to drive a 3nF load with a 30ns rise time. RT9618/A implements bootstrapping on the upper gate with anexternal capacitor and an embedded diode. This reducesimplementation complexity and allows the use of higherperformance, cost effective N-Channel MOSFETs. Adaptiveshoot-through protection is integrated to prevent bothMOSFETs from conducting simultaneously.
