ZXLB1600 Datasheet, PDF (1/7 Pages) Zetex Semiconductors – LCD BIAS BOOST CONVERTER

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
• 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
ORDERING INFORMATION
DEVICE
DEVICE DESCRIPTION TEMPERATURE RANGE
ZXLB1600X10
Boost converter for LCD
bias in MSOP10
0 °C to 70 °C
PART MARK
ZXLB1600
TAPING
OPTIONS
TA, TC
TA reels 500 devices, TC reels 2500 devices
DRAFT ISSUE J January 2002
ZXLB1600
1