Features and Benefits

  • Output Voltage:
    • +24V Positive
    • -20V Negative
  • Battery Input Voltage:
    • +0.8V to VOUT (Positive Output)
    • +0.8V to +15V (Negative Output)
  • +2.7V to +5.5V VCC Supply Range
  • Up to 20mA Output Current
  • Internal 28V N-Channel Switch
  • 1µA (Max) IC Shutdown Current
  • Up to 300kHz Switching Frequency
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX629 evaluation kit (EV kit) contains two separate switching-regulator circuits. The first circuit converts a +0.8V to VOUT battery voltage to a +24V LCD backplane bias voltage for currents up to 20mA. The second circuit converts a +0.8V to +12V battery voltage to a -20V voltage for currents up to 20mA. The MAX629 requires a +2.7V to +5.5V supply at VCC, but the inductor can be powered from as low as 0.8V. Both output voltages can be adjusted by changing the feedback-resistor values.

The MAX629 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. This EV kit is a fully assembled and tested surface-mount circuit board.


  • 2-Cell and 3-Cell Battery-Powered Applications
  • High-Efficiency DC-DC Boost Converters
  • Palmtop Computers
  • Positive or Negative LCD Bias Generators
  • Varactor Tuning Diode Bias

Documentation & Resources