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LTC4417 Power Path Controller PMOSFET Selection

Question asked by THAG on Jun 13, 2018

Hello,

I want to use the LTC4417 Power Path Controller in my next design.

The maximum current that flows through the PMOSFET will be up to 8A. I'm looking for a PMOSFET device with an small RDS(On) to keep the power dissipation low. The datasheet makes a few suggestion but form my point of view, the RDS(On) of these MOSFETs are to high. Another point is, that my design space is limited, so it would be great to have an Dual MOSFET Package.

I found the Si7997 that looks like an good candidate for me. First checks with the formulas from the datasheets looks ok.

https://www.mouser.com/datasheet/2/427/si7997dp-109454.pdf

Has someone experiences with this MOSFET? Or knows anyone a better choice?

I'm looking for an RDS(ON) <= 8mOhm per channel

 

Edge conditions:

Vmin =8V

Vmax =16V

Imax  =8A

CL = 240uF

Temperature: -40°C to 85°C

 

Many thanks and best regards,

Till Hagemann

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