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General Description

The MAX686 DAC-controlled boost/inverter IC converts a positive input voltage to a positive or negative LCD bias voltage up to +27.5V or -27.5V. The device features an internal N-channel MOSFET switch, programmable current limiting, and an internal 6-bit digital-to-analog converter (DAC) for digital adjustment of the output voltage. It comes in a small 16-pin QSOP package (same size as an 8-pin SO).

Features

? Internal 500mA, 28V N-Channel Switch (no external FET required)

? Adjustable Output Voltage to +27.5V or -27.5V

? 6-Bit DAC-Controlled Output Voltage

? Up to 90% Efficiency

? Small 16-Pin QSOP Package (Same size as 8-pin SO)

? Power-OK Indicator

? 65?A Quiescent Current

? 1.5?A Shutdown Current

? Up to 300kHz Switching Frequency

Applications

?? Positive or Negative LCD Bias

?? Personal Digital Assistants

?? Notebook Computers

?? Portable Data-Collection Terminals

?? Palmtop Computers

?? Varactor Tuning Diode Bias