Circuit Schematic Diagram of Adjustable 1.5A Step Down 1.5MHz Switching Regulator
semiconductor application notes July 17th, 2010We usually use high current linear solution to solve a high heating problem due to the power dissipation. However, an Adjustable 1.5A Step Down 1.5 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 :
Circuit Diagram of Adjustable 1.5A Step Down 1.5MHz Switching Regulator
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).
Because of the use of low ESR SMD ceramic capacitors and the current mode PWM topology, this circuit has a low output ripple. To prevent damages caused by accidental short circuit, it has current limiter and thermal protection. [Source : STMicroelectronics Application Notes]
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