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