Features and Benefits

  • +3V to +5.5V Input Voltage Range
  • Output Voltage Preset to 1.5V
    • 2.5V or 3.3V Selectable
    • 1.1V to VIN Adjustable
  • 2A Output Current
  • 92% Efficiency
  • 300kHz Switching Frequency
  • Synchronous Rectification for Improved Efficiency
  • No External Schottky Diode Required
  • Less than 1µA typical IC Shutdown Current
  • Surface-Mount Construction
  • Fully Assembled and Tested

Product Details

The MAX1644 evaluation kit (EV kit) provides a 1.5V output voltage from a +3V to +5.5V input source. It delivers up to 2A output current with 92% (max) efficiency. The MAX1644 is a step-down switching regulator with an internal synchronous rectifier to reduce the number of external components. It features a resistor-programmable fixed off-time as well as current-mode operation for superior load- and line-transient response.

The MAX1644 EV kit can also be used to evaluate other output voltages by changing the feedback resistors (R1 and R2) or by using the preset +3.3V or +2.5V settings.


  • +3.3V PC Card and CardBus Applications
  • +5V to +3.3V/+2.5V Conversion
  • CPU Daughter Card Supply
  • CPU I/O Supplies
  • Desktop Bus-Termination Boards
  • Notebook and Subnotebook Computers

Applicable Parts

Documentation & Resources