General Description
The MAX749 generates negative LCD-bias contrast voltages from 2V to 6V inputs. Full-scale output voltage can be scaled to -100V or greater, and is digitally adjustable in 64 equal steps by an internal digital-to-analog converter (DAC). Only seven small surfacemount components are required to build a complete supply. The output voltage can also be adjusted using a PWM signal or a potentiometer.

Features
♦ +2.0V to +6.0V Input Voltage Range
♦ Flexible Control of Output Voltage:
   Digital Control
   Potentiometer Adjustment
   PWM Control
♦ Output Voltage Range Set by One Resistor
♦ Low, 60µA Max Quiescent Current
♦ 15µA Max Shutdown Mode
♦ Small Size – 8-Pin SO and Plastic DIP Packages

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