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LM5072: Exposed Pad Connection Options

Jake Bailey
Prodigy 85 points
Part Number: LM5072
Other Parts Discussed in Thread: TPS23753A

The datasheet says "EP Exposed metal pad on the underside of the device. It is recommended to connect this pad to a PC Board plane connected to the VEE pin to improve heat dissipation."

My application uses Class 1 power (2 watt) and other routing concerns make connection to VEE plane difficult.

Measuring the pad to VEE shows no internal connection. Is the only reason for heat dissipation and hence why it is only recommended and not required? If so then I suppose it would also be acceptable to connect the exposed pad to RTN plane for adequate heat dissipation and eased routing?

Please advise. Thanks.

  • 0
    TI__Mastermind 41790 points
    Hi Jake,

    Any particular reason LM5072 is being used for a new project? For type 1 PD's, I highly recommend the TPS23753A.
    www.ti.com/.../TPS23753A
    TPS23753A has much more reference designs and EVMs with recommended layouts than the LM5072.

    As for the LM5072's exposed pad, we don't recommend connecting it the RTN as the data in the datasheet is based on it connected to VEE and have not tested this connected to RTN.