Power Supply Tip 31: The Right Choice of Synchronous Buck MOSFET Resistor Ratio

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

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CB3LV-31-8M192000

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TP-IP4220CZ6 5V 0.35PF breakdown voltage 6V SOT

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In this Power Design Tip, we'll look at how to trade conduction power in a synchronous buck power stage, which is related to duty cycle and FET resistance ratio. Performing this compromise process yields a very useful starting point for FET selection. Typically, as part of the design process, you have a set of specifications that include the input voltage range and the desired output voltage, and you need to select some FETs. In addition, if you are an IC designer, you will also have a budget that specifies the FET cost or package size. These two inputs will help you choose the total MOSFET chip area. These inputs can then be used to optimize the efficiency of each FET area.