Data Sheets Rev. 1
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Overview

Features and Benefits

  • Output Voltage:
    • +18V Typical Positive Output (or +12.6V to +24V adjustable with up/down)
    • -17V Typical Negative Output (or -22.7V to -11.4V adjustable with up/down)
  • Battery Input Voltage:
    • +0.8V to +18V (Positive Output)
    • +0.8V to +12V (Negative Output)
  • +2.7V to +5.5V VIN Supply Range
  • Up to 20mA Output Current
  • 6-Bit DAC-Controlled Output Voltage
  • Internal 0.5A, 28V N-Channel Switch
  • 1.3µA IC Shutdown Current
  • Up to 300kHz Switching Frequency
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX686 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains two separate switching-regulator circuits. The first circuit converts a +0.8V to +18V battery voltage to a +18V LCD bias voltage for currents up to 20mA. The second circuit converts a +0.8V to +12V battery voltage to a-17V voltage for currents up to 20mA.

The MAX686 requires a +2.7V to +5.5V supply at VIN, but the inductor can be powered from as low as +0.8V. The device features an internal N-channel MOSFET switch, programmable current limit, and internal 6-bit DAC for digital adjustment of the output voltage. The MAX686 EV kit provides low quiescent current and high efficiency for maximum battery life. Operation up to 300kHz allows the use of a tiny surface-mount inductor.

Applications

  • Notebook Computers
  • Palmtop Computers
  • PDAs and Other Handheld Devices
  • Portable Data-Collection Terminals
  • Positive or Negative LCD Bias
  • Varactor Tuning Diode Bias

Applicable Parts

Documentation & Resources

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  • Data Sheets (1)
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