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LM7480-Q1: Using lm74801 in output clamp mode

Massimiliano Di Ruggiero
Prodigy 40 points
Part Number: LM7480-Q1
Other Parts Discussed in Thread: LM74800-Q1,

Dear Team,

I'd like to use LM74800 for the protection of an automotive ECU with 12/24V supply, but the I.C. is not available in the market, thus I'm evaluating to use LM74801 that seems more available.

In the datasheet there is the difference between LM74800 and LM74801:

LM7480-Q1 has two variants, LM74800-Q1 and LM74801-Q1. LM74800-Q1 employs reverse current blocking using linear regulation and comparator scheme vs. LM74801-Q1 which supports comparator based scheme. 

I'd like to use the IC in common source configuration and  output clamp  mode, as shown in the application note https://www.ti.com/lit/SLVAES2 :

Is it possible to use the LM74801 in such configuration?

Thank You

  • 0
    TI__Guru 57737 points

    Hi Massimiliano,

    Welcome to e2e!

    Yes, LM74801-Q1 can also be used in common source configuration and  output clamp  mode. 

    As you mentioned the difference between  LM74800-Q1 and LM74801-Q1 is the way they block / react to a reverse current event. For more understanding on linear regulation vs comparator scheme please refer to section '6.1 Linear Regulation Control Vs Hysteretic ON/OFF Control' of Basics of Ideal Diodes App note.

  • 0 in reply to Praveen GD
    Prodigy 40 points

    Thank You Praveen,
    I checked the application note: with the LM74801 is it possible to have a reverse current discharging the storage capacitor on VOUTduring slow decreas of VIN, when the voltage drop in the mosfet is below V(AC_REV).