A very simple 16 volt switching power supply electronic circuit can be constructed using this circuit diagram that is based on the MAX668 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controller that is designed for a wide range of DC-DC conversion applications. The MAX668 integrated circuit supports a wide input voltage ra
nge from 1. 8V to 28V. The MAX668 has operating frequency between 100kHz to 500kHz, soft-start, and a SYNC input that allow the MAX668 oscillator to be locked to an external clock.