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LM74700-Q1: The difference of battery reverse protection

Jiacai Wang
Intellectual 420 points
Part Number: LM74700-Q1
Other Parts Discussed in Thread: LM74700-EP

Hi TI Experts,

We used LM74610 as battery reverse protection solution, we measure pulse waveform on output port, it is not what we expect.

We got LM74700 can output constant DC power, we see following chips have similar function: LM74500,LM74700-EP(-55℃ ~125℃ wider operation temperature range), LM74701, LM74720;

The quiescent current/shutdown current/input voltage range are similar, the PCB package and operation temperature are different. 

I can not see obvious difference. Please explain key features differences between LM74500/LM74700-EP/LM74701/LM74720;

Thanks,

Joseph 

  • 0
    TI__Expert 3370 points

    Hi Joseph,

    The following application note on basics of ideal diodes illustrates the differences between these devices in detail. Kindly refer to sections 5 (introduction paragraph), sec 5.1 for information about operation of LM74700 and LM74500 and the differences between the two. Please refer to section 6.6.2 and 6.6.3 for information about operation of LM74720 and LM74501 respectively. 

    Basics of Ideal Diodes (Rev. B) (ti.com)

    On a top level, LM74700 is an ORing controller which can protect against both reverse current and reverse input polarity events; while LM74500 Only protects against reverse polarity condition. LM74720 is like LM74700 in terms of protection features, but accomplishes protection while consuming lower(<35uA) quiescent current. LM74501 is like LM74500 in terms of protection features, but accomplishes the same without requiring a TVS diode at the input, saving the user board size in addition of providing battery monitoring functionality. Kindly refer to the above pointed sections in the referred app-note if more details are required.

    Regards

    Divyanshu