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RT9231A

Advanced PWM and Triple Linear Power Controller

Richtek Technology 

RT9231A

Advanced PWM and Triple Linear Power Controller

General Description

The RT9231A 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

AGP 1.5V or 3.3V bus power. The second linear

controller provides power for the 1.5V GTL bus and

the 3rd linear controller provides 1.8V power for the

North/South Bridge core voltage and/or cache

memory circuits.

The RT9231A 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 first linear controller is user-

selectable for output level of 1.5V and 3.3V with

±2.5% accuracy. The other two linear controllers

provide fixed output voltages of 1.5V ±3% and 1.8V

±3%. All the three linear controllers drive external N-

MOSFET or NPNs bipolar for the pass transistor.

The RT9231A 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.

Applications

z Full Motherboard Power Regulation for Computer

z Low-voltage Distributed Power Supplies

Features

z 4-in-one Regulated Voltages for Microprocessor

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

Cache Memory, GTL Bus Power

z Compatible with HIP6021A

z Power-good Output Voltage Monitor

Switching section

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

z ±1% DAC Accuracy

z Fast Transient Response

z Full 0% to 100% Duty Cycle Driver

z Fixed 200kHz Switching Frequency

z Adaptive Non-overlapping Gate Driver

z Over-current Monitor Uses MOSFET RDS(ON)

z Over-voltage Protection Uses Lower MOSFET

Linear Section

z Fixed or User-adjustable Linear Regulator

Output Voltage

z MOSFET and NPN Driving Capability

z Ultra Fast Response Speed

z Under-voltage Protection

z Internal Thermal Shutdown

Pin Configurations

Part Number

RT9231ACS

(Plastic SOP-28)

Pin Configurations

TOP VIEW

DRIVE2 1

FIX 2

VID4 3

VID3 4

VID2 5

VID1 6

VID0 7

PGOOD 8

SD 9

VSEN2 10

SELECT 11

SS 12

FAULT 13

VSEN4 14

28 VCC

27 UGATE1

26 PHASE1

25 LGATE1

24 PGND

23 OCSET1

22 VSEN1

21 FB1

20 NC

19 VSEN3

18 DRIVE3

17 GND

16 VAUX

15 DRIVE4

DS9231A-02 July 2001

www.richtek.com

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