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LMG3410R150: Inquiries about how to handle unused pins.

David Kim2
Expert 2730 points
Part Number: LMG3410R150

Hi

My customer is designing LMG3410R150RWHR.
It is said that the pins below are not used.

-unusde pins-

pin 25(LDO5V) , pin 26(VNEG), pin28(BBSW), pin29(LPM), pin30(RDRV), pin32(FAULT)

I want to know how to handle it. 

Thanks

  • 0
    TI__Prodigy 20 points

    Hi,

    If the customer is not using the following pins, here is how they should be connected -

    pin 25(LDO5V) - Connect a 1-µF bypass capacitor from this pin to source

    pin 29(LPM) - should be tied to pin 25(LDO5V)

    pin 32(FAULT) - it is an output pin, so can be left as is i.e., floating/open

    The following pins need to be configured according to the datasheet.

    pin30(RDRV) - Connect a resistor from this pin to source to set the turn-on drive strength. The value of the resistor determines the slew rate of the device during turn-on between 30V/ns and 100V/ns. Figure 2 from the datasheet provides the RDRV vs slew rate information.

    pin 26(VNEG) - Connect a 1-µF bypass capacitor from this pin to source

    pin28(BBSW) - Connect an inductor from this pin to source. A TDK Corporation VLS201610HBX-100M-1 10 µH SMT inductor in a 0806 package is recommended. This inductor is required to complete the internal buck boost converter which generates a negative voltage necessary to turn off the device. 

    Thanks,

    Nanditha