Features and Benefits

  • +3.5V to +14V Input Voltage Range
  • Fixed or Adjustable Output Voltage
    • +3.33V (Fixed)
    • +1.25V to VIN (Adjustable)
  • Guaranteed 1A Output Current
  • 100% Duty Cycle in Dropout
  • 600kHz Fixed-Frequency PWM Operation
  • Internal MOSFET Switch and Synchronous Rectifier
  • 2µA IC Shutdown Current
  • Surface-Mount Components
  • Fully Assembled and Tested

Product Details

The MAX1685 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that contains a pulse-width-modulated (PWM), step-down DC-DC converter. The EV kit provides a +3.33V output voltage from a +3.5V to +14V input source. It delivers up to 1A output current. The MAX1685 features internal MOSFET switches, low dropout voltage (100% duty-cycle operation), and an accurate +1.25V reference.

The MAX1685 EV kit provides low quiescent current, synchronous rectification, and high efficiency (up to 95%) for maximum battery life. Operation at 600kHz allows the use of a tiny surface-mount inductor.

The MAX1685 EV kit can also be used to evaluate the MAX1684, which operates at 300kHz and has slightly higher efficiency than the MAX1685.


  • 2-Way Radios and Walkie-Talkies
  • Cell Phones
  • Computer Peripherals
  • PDAs and Handy-Terminals
  • Personal Communicators

Applicable Parts