[Richtek]

General Description
The RT9222 integrates a PWM controller and two low-dropout linear regulators into a single chip. The PWM controller provides the CPU core voltage controlled by a 5-bit DAC and the linear section regulates power for GTL bus, clock driver or other circuits on motherboards.

Features
• Provides 3 Regulated Voltages
• N-MOSFET Driver for High Efficiency Switching Section
• Power-good, Over-voltage, and Currentlimiting Protection for Switching Section
• Adjustable Output Voltage for Linear Section
• Linear Section Uses Low Cost NPN Transistor as Power Device
• TTL-compatible 5-bit DAC Core Output Voltage

Applications
• Power Supply for Pentium, Pentium ProTM, Pentium IITM, PowerPCTM, K6TM, 6x86TM, and AlphaTM Microprocessors
• High-power 5V to 3.xV DC-DC Regulators
• Low-voltage Distributed Power Supplies
• Programmable Power Supplies