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RT9223

5-Bit Programmable Synchronous PWM

Buck Converter Controller

General Description

The RT9223 is a high efficiency synchronous

switching regulator for modern CPU application. The

output is controlled by a 5-bit DAC programmed from

1.3V to 2.05V in 0.05V steps and from 2.1V to 3.5V

in 0.1V increments.

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

controller

also

offers

integrated

functions including PGOOD, output enable, over-

voltage, internal digital-count soft start, and current-

limiting protection in one chip.

Features

High

Efficiency

Synchronous

N-MOSFET

Driver Operating at 200KHz

1.3V ~ 2.05V (0.05V steps) and 2.1V ~ 3.5V

(0.1V steps) Output Voltage

Enable Input, PGOOD Output, OVP, and

Current-limiting Protection

Internal Digital-count Soft Start

Applications

Power Supply for Pentium Pro

K6

TM

TM

, PowerPC

TM

,

, 6x86

TM

, and Alpha

TM

Microprocessors

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

Low-voltage Distributed Power Supplies

Programmable Step-down Power Supplies

Ordering Information

RT9223

Package type

S : SOP-20

Operating temperature range

C: Commercial standard

Pin Configurations

Part Number

RT9223CS

(Plastic SOP-20)

Pin Configurations

TOP VIEW

GND

1

VCC

2

OVP

3

PGOOD

CSN

CSP

PGNDH

DH

4

5

6

7

8

20

19

VID0

VID1

18

VID2

17

16

15

14

13

12

11

NC

9

PGNDL

10

VID3

VID4

VSEN

SHDN

BSTH

BSTL

DL

DS9223-07 May 2001

www.richtek-ic.com.tw

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