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RT9221

Programmable Synchronous PWM Buck Converter with

1.5V/2.5V Dual Low Dropout Linear Regulator Controller

General Description

The RT9221 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. The PWM controller

provides an adjustable Intel-compatible 1.3V~3.5V

output voltage. The synchronous N-MOSFET driver

with 200 KHz switching frequency optimizes the

efficiency, device size, and cost built-in over鈥搗oltage

and current-limiting protection prevent the CPU from

damage. Power-good signal is sent when the core

voltage is within

鹵10%

of the setting point.

The linear section is a low dropout regulator which

drives low cost NPN transistors to supply the 1.5V

and 2.5V regulated output power.

Features

Provides 3 Regulated Voltages

N-MOSFET

Power-good,

Driver

for

High

and

Efficiency

Current-

Switching Section

Over-voltage,

limiting Protection for Switching Section

1.5V and 2.5V Fixed Output Voltage for Linear

Section

Linear Section Uses Low Cost NPN Transistor

as Power Device

TTL-compatible

Voltage

5-bit

DAC

Core

Output

Applications

Power Supply for Pentium, Pentium Pro

Pentium II

Alpha

TM

TM

TM

,

, Power PC

TM

, K6

TM

, 6脳86

TM

, and

Microprocessors

High-power 5V to 3.xV DC-DC Regulators

Low-voltage Distributed Power Supplies

Programmable Power Supplies

Ordering Information

RT9221

Package type

S : SOP-24

Operating temperature range

C: Commercial standard

Pin Configurations

Part Number

RT9221CS

(Plastic SOP-24)

Pin Configurations

TOP VIEW

GND

GATE1

LDOS1

LDOS2

1

2

3

4

GATE2

23

LDOV

22

VID0

24

VCC

5

OVP

6

PGOOD

7

CSN

8

CSP

9

PGNDH

10

DH

11

PGNDL

12

VID1

20

VID2

19

VID3

18

VID4

17

VSEN

16

SHDN

15

BSTH

14

BSTL

13

DL

21

DS9222-05 May 2001

www.richtek-ic.com.tw

1

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