RT8868A

® RT8868A 4/3/2/1-Phase PWM Controller for AMD AM2/AM2+/AM3 CPUs General Description The RT8868A is a 4/3/2/1-phase synchronous buck controller with two integrated MOSFET drivers for CPU power application and a single-phase buck with integrated MOSFET driver for North-Bridge (NB) chipset. The RT8868A uses differential inductor DCR current sense to achieve phase current balance and active voltage positioning. Other features include adjustable operating frequency, power good indication, external error-amp compensation, over voltage protection, over current protection and enable/shutdown for various applications. The RT8868A comes in a small footprint with WQFN-48L 7x7 package. Applications z Desktop CPU Core Power z Low Voltage, High Current DC/DC Converter Ordering Information RT8868A Package Type QW : WQFN-48L 7x7 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : ` RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020. ` Suitable for use in SnPb or Pb-free soldering processes. Marking Information RT8868AGQW : Product Number RT8868A GQW YMDNN : Date Code YMDNN Features z 12V Power Supply Voltage z 4/3/2/1-Phase Power Conversion for VCORE Power z 3 Embedded MOSFET Drivers (2 for CPU and 1 for NB) z Internal Regulated 5V Output z Support AMD AM2 6-bit Parallel and AM2+ 7-bit Serial VID Tables z Support 3.4MHz High Speed I2C z Continuous Differential Inductor DCR Current Sense z Adjustable F...