Maxim Integrated MAX1620EEE

Description
The MAX1620/MAX1621 are digitally adjustable LCD bias supplies that convert a 1.8V to 20V battery voltage to a positive or negative LCD backplane bias voltage. They feature automatic disable when the display logic voltage is removed, protecting the display. These devices require minimal PC board area, come in ultra-small QSOP packages, and require only small, low-profile external components. Output voltage can be set to a desired positive or negative voltage range with external resistors and adjusted over that range with the on-board digital-to-analog converter (DAC) or with a potentiometer. The MAX1620/MAX1621 include a 5-bit DAC, allowing digital software control of the bias voltage. The MAX1620 uses up/down digital signaling to adjust the DAC, and the MAX1621 uses the System Management Bus (SMBus TM) 2-wire serial interface.

Features
Automatic Disable when Display Logic is Shut Down
Extremely Small QSOP Package
32-Level Internal DAC
SMBus Serial Interface (MAX1621)
Positive or Negative Output Voltage

Applications
Notebook Computers
Palmtop Computers
Personal Digital Assistants
Portable Data-Collection Terminals