General Description
The MAX1620/MAX1621 convert a 1.8V to 20V battery voltage to a positive or negative LCD backplane bias voltage. Backplane bias voltage can be automatically disabled when the display logic voltage is removed, protecting the display. These devices use very little PC board area, come in ultra-small QSOP packages, and require only small, low-profile external components.

Features
♦ 1.8V to 20V Battery Input Voltage
♦ 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