LMR23625-Q1: UVLO operation

K.Hamamoto

Guru 12155 points

Part Number: LMR23625-Q1

I would like to know about UVLO operation. There are two UVLO for this device.

1. VIN_UVLO

Does this device restart by soft-start when VIN is recovered to over VIN_UVLO?

(In this case, EN is connected to other supply rail to keep high level during VIN UVLO.)

2. VCC UVLO

Does this device restart by soft-start when VCC is recovered to over VCC_UVLO?

(In this case, EN is connected to other supply rail to keep high level during VCC UVLO.)

Regards,

Koji Hamamoto

0 Arief Hernadi over 8 years ago

Hi,

I think in general the VCC UVLO is overlapping VIN UVLO.

I tried in the lab by tying EN to a different rail (3.3V) and ramping VIN close to 3.6V and the part will soft-start

But be careful, on the datasheet abs max for EN pin is VIN + 0.3V. Therefore when VIN is 0, it is not advisable to put EN to be 3.3V

Thanks

-Arief

0 K.Hamamoto over 8 years ago in reply to Arief Hernadi

Guru 12155 points

Hi Arief-san,

I am terribly sorry for the delay in my reply.

I understood.

Regards,
Koji Hamamoto

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