Adjustable 5A Step Down 5 MHz switching regulator circuit can also be used to overcome such problem. It uses ST1S03 step down DC-DC converter.The ST1S03 can also be used to power low-voltage digital core in HDD application. With input voltage range 3V to 16V, the ST1S03 can gives current up to 1. 5A. The circuit can use tiny surface-mount components due to an high switching frequency (1. 5 MHz).
Resistor divider is used to set the output voltage value. Components needed to build the divided are capacitors (2 pieces), schottky diode (1 piece), and inductor (1 piece).