General Description
The RT9238 is a 4-in-one power controller optimized for high-performance microprocessor and computer applications. The IC integrates a PWM controller, triple linear controller as well as monitoring and protection functions into a 28-pin SOP package. The PWM controller regulates the microprocessor core voltage with a synchronous buck converter. The first linear controller supplies the computer system’s AGTL+ 1.2V bus power. The second linear controller provides power for the 1.5V AGP bus and the 3rd linear controller provides 1.8V power for the chipset core voltage and/or cache memory circuits.

FEATUREs
• 4-in-one Regulated Voltages for Microprocessor Core, AGTL+ Bus, AGP Bus Power, and North/South Bridge Core
• Compatible with ISL6524
• Power-good Output Voltage Monitor

Switching section
• VRM8.5 TTL-Compatible 5-bit DAC Programmable from 1.090V to 1.865V
• ±1% DAC Accuracy
• Fast Transient Response
• VRM 8.5 Voltage Droop Tuning Uses MOSFET R DS(ON)
• Fixed 200KHz Switching Frequency
• Adaptive Non-overlapping Gate Driver
• Over-current Monitor Uses MOSFET RDS(ON)
• Over-voltage Protection Uses Lower MOSFET

Linear Section
• Fixed or User-adjustable Linear Regulator Output Voltage
• MOSFET and NPN Driving Capability
• Ultra Fast Response Speed
• Under-voltage Protection
• Internal Thermal Shutdown

APPLICATIONs
• Motherboard Power Regulation for Computers