MAX668 16V 4.4A switching power supply circuit design
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 range 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.
This power supply circuit require an input voltage of 11-14.3 volts and will provide a fixed output voltage of 16 v at a maximum current of 4.4 amperes .
At the maximum output power that is around 70 watts , this power supply circuit has a efficiency around 90% .
Capacitor C2-C5 are connected in parallel for ripple current rating. Fewer caps may be used if ripple current ratings allow .