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Preliminary

RT9266B

Tiny Package, High Efficiency, Step-up DC/DC Converter

General Description

The RT9266B is a compact, high efficiency, and low

voltage step-up DC/DC converter with an Adaptive

Current Mode PWM control loop, includes an error

amplifier, ramp generator, comparator, switch pass

element and driver in which providing a stable and

high efficient operation over a wide range of load

currents. It operates in stable waveforms without

external compensation.

The low start-up input voltage below 1V makes

RT9266B suitable for 1 to 4 battery cells

applications with a 500mA internal switch. The

550kHz high switching rate minimized the size of

external components. Besides, the 25碌A(chǔ) low

quiescent current together with high efficiency

maintains long battery lifetime.

Features

1.0V Low Start-up Input Voltage at 1mA Load

25碌A(chǔ) Quiescent (Switch-off) Supply Current

Zero Shutdown Mode Supply Current

90% Efficiency

550kHz Switching Frequency at 3.3V V

DD

Providing Flexibility for Using Internal and

External Power Switches

Small SOT-26 Package

Applications

PDA

DSC

LCD Panel

RF-Tags

MP3

Portable Instrument

Wireless Equipment

Ordering Information

RT9266B

Package Type

E : SOT-26

Operating Temperature Range

C: Commercial Standard

Pin Configurations

Part Number

RT9266BCE

(Plastic SOT-26)

Pin Configurations

TOP VIEW

6

5

4

1

2

3

Marking Information

For marking information, contact our sales

representative directly or through a RichTek

distributor located in your area, otherwise visit our

website for detail.

1.

2.

3.

4.

5.

6.

CE

EXT

GND

LX

VDD

FB

DS9266B-00

May 2003

www.richtek.com

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