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Preliminary

RT9263

High Efficiency, Low Supply Current,

Step-up DC/DC Converter

General Description

The RT9263 is a compact, high efficient, step-up

DC/DC converter with an adaptive current mode

PWM control loop, providing a stable and high

efficient operation over a wide range of load

currents. It operates in both continuous and

discontinuous current modes in stable waveforms

without external compensation.

The low start-up input voltage below 1V makes

RT9263 suitable for 1 to 4 battery cell applications

providing up to 400mA output current. The 550KHz

high switching rate minimized the size of external

components. Besides, the 17碌A(chǔ) low quiescent

current together with high efficiency maintains long

battery lifetime.

Features

1.0V Low Start-up Input Voltage

High Supply Capability to Deliver 3.3V 100mA

with 1V Input Voltage

17碌A(chǔ) Quiescent (Switch-off) Supply Current

碌

90% Efficiency

550KHz Fixed Switching Rate

Providing Flexibility for Using Internal and

External Power Switches

SOT89-5 Package

Applications

PDA

Portable Instrument

DSC

Ordering Information

RT9263

Package type

X5 : SOT89-5

Operating temperature range

C: Commercial standard

C : Chip enable control

E : Driver for external power devices

Pin Configurations

Part Number

RT9263CCX5

(Plastic SOT89-5)

Pin Configurations

TOP VIEW

5

4

1

2

3

1.

2.

3.

4.

5.

1.

2.

3.

4.

5.

CE

VDD

FB

LX

GND

EXT

VDD

FB

LX

GND

RT9263ECX5

(Plastic SOT89-5)

TOP VIEW

5

4

Typical Application Circuit

1

2

3

V

IN

+

100pF

VDD

CE

RT9263CCX5

LX

GND

FB

R2

980K

D1

1N5819

C2

1碌F

+

R1

1.6M

L1

4.7碌H

100碌F

3.3V

V

OUT1

C1

100碌F

Fig. 1 RT9263CCX5 Typical Application for Portable Instruments below 400mA

DS9263-00 November 2001

www.richtek-ic.com.tw

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