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TPS51116: FET Voltage

Genius 10675 points

Replies: 2

Views: 58

Part Number: TPS51116

Hi team, 

We are using the TPS51116 with two external FETs with a VGS rating of +/-20V; the proposed is +/-12V.

It seems like the DRVH is set in relation to VBST and configures the source voltage for the high-side FET. Our VIN is 5V, can you determine what the voltage will be at the source of the FET (LL pin)?

Thanks,

Arthur

  • Hi Arthur, 

    LL pin is connected to switch node. 

    The boot cap voltage (the voltage between VBST and LL pin) will be used for high-side gate drive. 

    The boot cap voltage is V5IN voltage minus 0.8V. 

    You may need to consider external FET with lower Vgs threshold. 

    Thanks

    Qian

  • In reply to Qian Chen:

    Thanks Qian, 

    I will let you know if the customer comes back with additional questions.

    Thanks,

    Arthur

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