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.

Features

12V Power Supply Voltage

4/3/2/1-Phase Power Conversion for VCORE Power 3 Embedded MOSFET Drivers (2 for CPU and 1 for NB)

Internal Regulated 5V Output

Support AMD AM2 6-bit Parallel and AM2+ 7-bit Serial VID Tables

Support 3.4MHz High Speed I2C

Continuous Differential Inductor DCR Current Sense

Adjustable Frequency (Typically at 300kHz)

Selectable 1 or 2 Phase in Power-Saving (PS) Mode

Phase-Interleaving for VCOREController

Power Good Indication

Adjustable Over Current Protection

Over Voltage Protection

Small 48-Lead WQFN Package

RoHS Compliant and Halogen Free