TPS51220A: MOSFET Selection

Jerry Chu

Genius 4915 points

Part Number: TPS51220A

Hi Expert,

I want to use the below MOSFET in TPS51220A LS, could you guide me which one is better? Any concern? Thanks!

VIN=24V

Vout=12V

Iout=5A

0 Sam(MPAA) Zhang over 6 years ago

Hi,

For low side MOSFET, the first one should be better. Power loss on low side MOSFET is mainly conduction loss. So a MOSFET with lower Rdson is better.

While for the high side, switching loss dominated, so small Qg is preferred. Thanks!

Regards,

Hao

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