RT9263

Preliminary

1

DS9263-09

March 2007

www.richtek.com

Features

1.0V Low Start-up Input Voltage

High Supply Capability to Deliver 3.3V 100mA with

1V Input Voltage

17

μμμμμA Quiescent (Switch-off) Supply Current

90% Efficiency

550kHz Fixed Switching Rate

Providing Flexibility for Using Internal and

External Power Switches

SOT-89-5 Package

RoHS Compliant and 100% Lead (Pb)-Free

Pin Configurations

Applications

PDA

Portable Instrument

DSC

High Efficiency, Low Supply Current, Step-Up DC/DC Converter

Ordering Information

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

μA low quiescent current together with high efficiency

maintains long battery lifetime.

(TOP VIEW)

RT9263CCX5

SOT-89-5

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.

2

34

5

1

EXT

GND

LX

FB

VDD

RT9263ECX5

SOT-89-5

2

34

5

1

EN

GND

LX

FB

VDD

Note :

RichTek Pb-free and Green products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

100%matte tin (Sn) plating.

RT9263

Package Type

X5 : SOT-89-5

Operating Temperature Range

P : Pb Free with Commercial Standard

G : Green (Halogen Free with Commer-

cial Standard)

C : Chip enable control

E : Driver for external power devices