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ZXLB1600

LCD BIAS BOOST CONVERTER

DESCRIPTION

The ZXLB1600 DC/DC boost converter accepts an input voltage of between 1.6V and 5.5V and

provides an adjustable output voltage of up to 28V for LCD backplane bias. The device contains the

output switch and a second switch to isolate the coil from the input and provide true isolation in

shutdown mode. The output can be adjusted by means of an externally applied dc voltage, or PWM

control signal and can supply typically 10mA of output current at maximum output voltage. Higher

current is available at lower output voltages.

The input voltage range accepts a number of battery solutions, including dual dry cell and single Li-Ion

cells and PFM operation mode allows the output to be regulated with high efficiency under light or no

load conditions. The switching frequency range permits the use of miniature surface mount inductors.

The voltage control range can be modified, if required, by external resistors. A low battery comparator

is provided to indicate when the input voltage has fallen to within

±2% of a preset threshold.

FEATURES

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Wide input voltage range: 1.6 to 5.5V

•

Adjustable output voltage up to 28V using PWM or analog control voltage

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True shutdown (output isolated from input)

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Internal output switch and current sense

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•

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Up to 500kHz switching frequency (PFM)

•

85% efficiency

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Low battery flag

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Small MSOP10 package

•

Low external component count

APPLICATIONS

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PDAs

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Mobile Phones

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Digital Cameras

•

Portable Internet Appliances

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Notebook and Palmtop computers

ORDERING INFORMATION

DEVICE

DEVICE DESCRIPTION

TEMPERATURE RANGE

PART MARK

TAPING

OPTIONS

ZXLB1600X10

Boost converter for LCD

bias in MSOP10

0

°C to 70 °C

ZXLB1600

TA, TC

TA reels 500 devices, TC reels 2500 devices

DRAFT ISSUE J January 2002

ZXLB1600