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