SP4446EK(2003) Ver la hoja de datos (PDF) - Signal Processing Technologies

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SP4446EK
(Rev.:2003)

High Output Voltage Boost Regulator LCD Bias Regulator

Signal Processing Technologies 

®

PRELIMINARY

SP4446

High Output Voltage Boost Regulator

LCD Bias Regulator

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)

APPLICATIONS

■ LCD Bias

■ Tuner Pin Voltage

■ White LED Driver

■ High Voltage Bias

■ Digital Cameras

■ Cell Phone

■ Battery Backup

■ Handheld Computers

VIN

SHDN

5

4

SP4446

5 Pin SOT-23

1

2

3

SW

GND

FB

Now Available in Lead Free Packaging

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

VIN

2 to 7V

C1

4.7µF

L1

D1

10µH

VIN

SW

R1

SP4446

SHDN GND

FB

R2

High

Voltage Output

C2

2.2 µF

Rev. 7/14/03

SP4446 High Output Voltage Boost Regualtor, LCD Bias Regulator

1

© Copyright 2003 Sipex Corporation

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