General Description

The RT8801B is a multi-phase synchronous buck controller which is implemented with full control functions for AMD K8 compliant CPU. The RT8801B could be operated with 2, 3 or 4 buck switching stages operating in interleaved phase set automatically. The multiphase architecture provides high output current while maintaining low power dissipation on power devices and low stress on input and output capacitors.

Features

● Multi-Phase Power Conversion with Automatic Phase Selection

● 6-bits AMD K8 DAC Output with Active Droop Compensation for Fast Load Transient

● Smooth VCORE Transition at VID Jump

● Power Stage Thermal Balance by DCR Current Sense

● Hiccup Mode Over-Current Protection

● Adjustable Switching Frequency (50kHz to 400kHz per Phase)

● Under-Voltage Lockout and Soft-Start

● High Ripple Frequency Times Channel Number

● 2-Wires Programming Interface

● Software Programmable VID

● 32-Lead VQFN Package

● RoHS Compliant and 100 Lead (Pb)-Free

Applications

● AMD K8 compliant Processors Voltage Regulator

● Low Output Voltage, High power density DC-DC Converters

● Voltage Regulator Modules