LP5907: Short circuit current limit behavior

Michael Balourdas

Part Number: LP5907

Hello,

The datasheet for this device specs the short circuit current limit as 500mA typ, however I don't see anywhere that describes the limiting behavior. Is it brickwall or foldback?

Thanks,

Michael

over 1 year ago

0 Stephen Ziel over 1 year ago

TI__Mastermind 37065 points

Hi Michael,

The internal test data that I can locate shows Vout decreasing in value as you increase the load current (above current limit). This emulates a foldback current limit and not a brickwall.

Thanks,

Stephen

0 Michael Balourdas over 1 year ago in reply to Stephen Ziel

TI__Expert 5455 points

Thanks for the reply Stephen. Are you able to share any of this data? I'm surprised there's no information in the datasheet on the behavior.

Thanks,

Michael

0 Stephen Ziel over 1 year ago in reply to Michael Balourdas

TI__Mastermind 37065 points

Hi Michael,

I was just in the process of updating my reply. I realized that the test data I was reviewing used a customer specific circuit and I would not count on that emulating the current limit. Let me see if I can locate something more specific that I can share, if not, let me see if we can measure something for you. Give me 2-3 business days to respond.

Thanks,

Stephen

0 Stephen Ziel over 1 year ago in reply to Stephen Ziel

TI__Mastermind 37065 points

Hi Michael,

Looks like it is more of a brick wall current limit than foldback. Sorry for the confusion. Here is some test data using a 2.7V output version of this LDO that we had readily available in our office.

Thanks,

Stephen

0 Michael Balourdas over 1 year ago in reply to Stephen Ziel

TI__Expert 5455 points

Thanks Stephen! Do you have any information on the recovery behavior? Is there any kind of internal delay in voltage regulation once the overcurrent condition is gone?

0 Stephen Ziel over 1 year ago in reply to Michael Balourdas

TI__Mastermind 37065 points

It's an older part, so there might be a delay in recovery. We can measure it and see what happens. Please give us a few business days to get that measurement.

Thanks,

Stephen

0 Hannah Grace over 1 year ago in reply to Michael Balourdas

TI__Genius 15125 points

Hello Michael,

I have taken a recovery picture from current limit on the LP5907.

As you can see recovery is almost instantly out of current limit.

Best Regards,

Hannah

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LP5907: Short circuit current limit behavior