The LTC3604 IC circuit is a high efficiency  monolithic synchronous buck regulator using a phase-lockable controlled on-time current mode architecture capable of supplying up to 2.5A of output current.

The operating voltage range of the LTC3604 is from 3.6V to 15V , reason that  make it suitable for a wide range of power supply applications.

The operating frequency of the LTC3604 is programmable from 800kHz up to 4MHz using an external resistor  .

This power supply circuit based on the LTC3604 regulator deliver a maximum output voltage of 3.3 volts at a maximum output current of 2. 5 ampers .

The require input voltage for this LTC3604 power supply is 12 volts .

As you can see in this electronic schematic circuit the LTC3604 regulator IC require few external components that make it ideal for small circuits .

The main features of the LTC3604 are : 3.6V to 15V Operating Input Voltage Range , 2.5A Output Current , Up to 95% Efficiency , Very Low Duty Cycle Operation: 5% at 2.25MHz , Adjustable Switching Frequency: 800kHz to 4MHz , External Frequency Synchronization , Short-Circuit Protected , etc .