[RichTek]

General Description

The RT9230 is a 4-in-one power controller optimized for high-performance microprocessor and computer applications. The IC integrates two PWM controller, two linear controllers as well as monitoring and protection functions into a 28-pin SOP package. The first PWM controller regulates the microprocessor core voltage with a synchronous buck converter, while the second PWM controller supplies the computer system’s AGP 1.5V or 3.3V bus power with a standard buck converter. The first linear regulator provides power for the 1.5V GTL bus and the second linear regulator provides 1.8V power for the North/South Bridge core voltage and/or cache memory circuits.

The RT9230 features an Intel-compatible, TTL 5-bit programmable DAC that adjusts the core voltage from 2.1V to 3.5V in 0.1V increments and from 1.3V to 2.05V in 0.05V steps. The 5-bit DAC has a typical ±1 tolerance. The second PWM controller is user selectable for output level of 1.5V and 3.3V with ±2.5 accuracy. The linear controllers drives external N-MOSFET or NPN bipolar for the pass transistor to provide fixed output voltages of 1.5V ±3 and 1.8V ±3.

The RT9230 monitors all the output voltages. A Power -good signal is issued when the core voltage is within ±10 of the DAC setting and the other levels are above their under-voltage levels. Additional build-in over-voltage protection for the core output uses the lower MOSFET to prevent output voltage above 115 of the DAC setting. The PWM over-current function monitors the output current using the voltage drop across the MOSFET’s RDS(ON), which eliminates the need for a current sensing resistor.

Features

● 4-in-one Regulated Voltages for Microprocessor

Core, AGP Bus, North/South Bridge and/or

Cache Memory, GTL Bus Power

● Compatible with HIP6020

● Power-good Output Voltage Monitor

Switching section

● 5-bit DAC Programmable from 1.3V to 3.5V

● ±1 DAC Accuracy

● Fast Transient Response

● Full 0 to 100 Duty Cycle Driver

● 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 Linear Regulator Output Voltage

● MOSFET or NPN Driving Capability

● Ultra Fast Response Speed

● Under-voltage Protection

● Internal Thermal Shutdown

Applications

● Full Motherboard Power Regulation for Computer

● Low-voltage Distributed Power Supplies