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LM9061 used with reversed NFET

martin goulet
Prodigy 10 points
Other Parts Discussed in Thread: LM9061, LM5060

I would like to use the LM9061 in an application where a NFET is used in two modes : 

1- In this mode the NFET acts as an ideal diode, in case the battery would be connected in reverse. When activated, the mosfet stays on to power a bridge configuration for the load.

2- In this mode, the NFET allows some power to be returned to the battery for charging. (think regenerative braking)

Would the LM9061 be a good choice in this application? In the typical application diagrams, the NFET is always oriented in the "conventional" way.

  • 0
    TI__Mastermind 22610 points

    Not sure what all the dynamics are, but my first guess is that the LM9061 (or LM5060) will not meet your requirements. Two biggest issues to deal with are 1) the body diode in the MOSFET, and  2) the charge pump output for gate drive with its diode clamp to the out pin.

    The LM9061 cannot behave as "... an ideal diode" as it has no circuitry to sense the forward/reverse voltage. For ideal diode function there are specific MOSFET controllers that will emulate the ideal diode behavior. In these controller the NFETs are oriented in the "un-conventional" way.