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.

FEATURES

• Wide input voltage range: 1.6 to 5.5V

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

• True shutdown (output isolated from input)

• Internal output switch and current sense

• Low quiescent current: (75µA max)

• 5µA (max) shutdown current (including low battery comparator)

• Up to 500kHz switching frequency (PFM)

• 85 efficiency

• Low battery flag

• Small MSOP10 package

• Low external component count

APPLICATIONS

• PDAs

• Mobile Phones

• Digital Cameras

• Portable Internet Appliances

• Notebook and Palmtop computers