Dual-Phase PWM Controller for GPU Core Power Supply

The RT2701 is a dual-phase synchronous Buck PWM controller with integrated drivers which are optimized for high performance graphic microprocessor and computer applications. The IC integrates a PWM controller, two 12V MOSFET drivers with internal bootstrap diodes, as well as output current monitoring and protection functions into the WQFN-24L 4x4 package. The RT2701 adopts DCR and R_DS(ON) current sensing. Over current protection is accomplished through continuous inductor DCR current sensing, while R_DS(ON) current sensing is used for accurate channel current balance. Using both methods of current sampling utilizes the best advantages of each technique. The RT2701 also features an one-bit VID control operation in which the feedback voltage is regulated and tracks external input reference voltage. Other features include adjustable operating frequency, external compensation and enable/shutdown functions.