Description
The RT8812A is a 2/1 phase synchronous Buck PWM controller that is optimized for high-performance graphic
microprocessors and computer applications. The IC integrates a Constant-On-Time (COT) PWM controller, two
MOSFET drivers with internal bootstrap diodes, as well as channel current balance and protection functions
including Over Voltage Protection (OVP), Under Voltage Protection (UVP), current limit, and thermal shutdown into the WQFN-20L 3×3 package.
The RT8812A adopts RDS(ON) current sensing technique. The current limit is accomplished through continuous inductor current-sense, while RDS(ON) current sensing is used for accurate channel current balance. Using the method of current sampling utilizes the best advantages of each technique.
The RT8812A features external reference input and PWMVID dynamic output voltage control, in which the feedback voltage is regulated and tracks external input reference voltage. Other features include adjustable switching frequency, dynamic phase number control, internal/external soft-start, power good indicator, and enable functions.
