1

Rev. 7/14/03

SP4446 High Output Voltage Boost Regualtor, LCD Bias Regulator

© Copyright 2003 Sipex Corporation

SP4446

FEATURES

■ High Output Voltage: Up to 30V

■ High Efficiency

■ Low Quiescent Current: ~20uA

■ Miniature Package: (5-lead SOT-23)

■ Single Battery Cell Operation

■ Programmable Output Voltage

■ 1Ω Switch (150mV at 150mA)

High Output Voltage Boost Regulator

LCD Bias Regulator

APPLICATIONS

■ LCD Bias

■ Tuner Pin Voltage

■ White LED Driver

■ High Voltage Bias

■ Digital Cameras

■ Cell Phone

■ Battery Backup

■ Handheld Computers

DESCRIPTION

The SP4446 is a micro power Boost Regualtor in a 5-lead SOT-23 package. It is a current limited,

fixed off time regulator configured for use in boost mode applications. The operating voltage can

be less than 3V and is capable of generating voltages as high as 30 Volts.

The SP4446 is to be supplied in a SOT-23-5 and permits the construction of complete regulators

that occupy < 0.2 square inches of board space.

®

TYPICAL APPLICATION SCHEMATIC

PRELIMINARY

54

12

3

SP4446

VIN

SHDN

SW

GND

FB

5 Pin SOT-23

Now Available in Lead Free Packaging

V

IN

SW

GND

SHDN

FB

10µH

D1

L1

R1

R2

C2

2.2 µF

High

Voltage Output

V

IN

4.7µF

C1

2 to 7V

SP4446