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LM46001 - the EN pin maximum absoulte rating in case of inverting DCDC

Hirotaka Matsumoto
Guru 27525 points
Other Parts Discussed in Thread: LM46001

Hi all

Would you mind if we ask LM46001?

How much is the EN pin maximum absoulte rating in case of inverting DCDC(as like following URL)?
http://www.tij.co.jp/jp/lit/df/snvr426/snvr426.pdf

The datasheet shows EN to PGND : -0.3 VIN + 0.3.
So, when the input is 24V and PGND(of the device)=-15V, the EN pin maximum absoulte rating is 39V.
Is our recognition correct?

We appreciate for your help always.

Kind regards,

Hirotaka Matsumoto

  • 0
    TI__Genius 11085 points

    If the 39V is referring to the PGND of the LM46001, then yes.

    If the 39V is referring to the system ground and PGND of the IC is -15V, then only 24V (=VIN) can be used.

    Be careful with the EN level during transiets and startup/shutdown as well. Not just the DC level.

    -Yang