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Preliminary

RT9264

High Frequency, High Efficiency, Step-up DC/DC Converter

General Description

The RT9264 is a compact, high efficient, step-up

DC/DC converter with current mode PWM control

loop, providing stable and high efficient operations

without external compensation.

The RT9264 suitable for 1 to 4 battery cells as well

as USB power applications providing up to 400mA

output current. The high switching rate minimized

the size of external components.

A 300mA LDO is included in RT9264 to provide a

secondary low noise output as well as an output

current stop in the shutdown mode. RT9264 is

provided in SOP-8 packages.

Features

400mA High Supply Capability

90% Efficiency

Switching Rate higher Than 1.4MHz

Providing Flexibility for Using Internal and

External Power Switches

Built-in 300mA LDO, also for the Zero-Output-

Current Shutdown Mode

Boost DC-DC Integrating LDO for Up-Down

Regulation

8-Pin SOP Package

Applications

Portable Instrument

ADSL Modem

USB Devices

Ordering Information

RT9264

Package type

S : SOP-8

Operating temperature range

C: Commercial standard

Pin Configurations

Part Number

RT9264CS

(Plastic SOP-8)

GND

1

EXT

2

LFB

3

LDOO

4

Pin Configurations

TOP VIEW

8

7

6

5

CE

LX

VDD

FB

Typical Application Circuit

V

IN

L1

2.2碌H

D1

1N5819

C2

1碌F

+

R2

22K

47碌F

VDD

CE

R1

36K

3.3V

V

OUT1

RT9264

EXT

LX

2.5V

V

OUT2

C3

10碌F

+

R4

42K

R3

22K

L DO O

LFB

GND

FB

C1

47碌F

Fig. 1 RT9264 Typical Application for Portable Instruments

DS9264-00 December 2001

www.richtek-ic.com.tw

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