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RT9224
(Rev.:2001)

5-Bit Programmable Synchronous PWM Buck Converter Controller and Output Voltage Monitor

Richtek Technology 

RT9224

5-Bit Programmable Synchronous PWM Buck Converter

Controller and Output Voltage Monitor

General Description

The RT9224 is a high speed switching controller

designed for use in synchronous DC/DC buck

converter for modern CPUs. The regulated output

voltage is digitally programmable from 1.3V to 3.5V

by a 5-bit DAC which provides initial accuracy of

±1%. The RT9224 drives two external N-channel

MOSFETs, providing high efficiency and eliminating

the need for high cost P-channel devices. It senses

the output current across the on-resistance of the

upper N-channel MOSFET and provides an

adjustable current limit without external sense

resistor.

RT9224 monitors the output voltage and provides

the output signal for power-good and over-voltage

protection. The switching controller drivers two N-

MOSFETs at 200kHz frequency and provides an

optimal solution for size, efficiency and cost in any

application circuits. The high switching frequency

cooperating with a high speed error amplifier

maintains a fast response to the dynamic load of

modern CPUs.

Ordering Information

RT9224……

Package type

S : SOP-20

Operating temperature range

C: Commercial standard

Features

z Compatible with HIP6004B

z Simple Voltage-mode PWM Control with Buck

Rectification

z ±1% DAC Output Voltage Accuracy

z 5-Bit Digital-to-Analog Output Voltage Range

from 1.3 V to 3.5V

z Fast Transient Response and Excellent Output

Voltage Regulation

z Fault Protection for Over-voltage and Over-

current

z Power-good Output Voltage Monitor

z Fixed 200kHz Switching Frequency

Applications

z Power Supply for Pentium, Pentium ProTM,

Pentium IITM, PowerPCTM, K6TM, 6x86TM, and

AlphaTM Microprocessors

z Low-voltage Distributed Power Supplies

z High Power 5V to 1.3V~3.5V Switching Regulator

Pin Configurations

Part Number

RT9224CS

(Plastic SOP-20)

Pin Configurations

TOP VIEW

VSEN 1

OCSET 2

SS 3

VID0 4

VID1 5

VID2 6

VID3 7

VID4 8

NC 9

FB 10

20 NC

19 OVP

18 VCC

17 LGATE

16 PGND

15 BOOT

14 UGATE

13 PHASE

12 PGOOD

11 GND

DS9224-04 July 2001

www.richtek.com

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