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
♦ 65µA Quiescent Current
♦ 1.5µA 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