LM61460-Q1: Can LM61460-Q1 handle output short to 14V?

Elec Cheng

Part Number: LM61460-Q1

Hi Expert,

Our customer use LM61460-Q1 to power off board load. So there might be "vout short to 14V " risk. what will happen to LM61460-Q1 if Vout is short to 14V ? Will it be broken? Thanks.

BR,

Elec Cheng

over 2 years ago

0 Jimmy Hua over 2 years ago

TI__Guru 50120 points

Hi Elec,

What is the input voltage in this application? If the input voltage is lower than the output voltage during the 14V short, then there may be some reverse current that will backflow through the SW node and damage the internal circuitry.

I would suggest reading this app note on reverse current causes and solutions: https://www.ti.com/lit/an/slua962/slua962.pdf

Regards,

Jimmy

0 Elec Cheng over 2 years ago in reply to Jimmy Hua

TI__Expert 7055 points

Hi Jimmy,

The input voltage is battery. Actually the case is that Vout is short to battery also. Under this condition, will it be reverse current? Thanks.

BR,

Elec Cheng

0 Jimmy Hua over 2 years ago in reply to Elec Cheng

TI__Guru 50120 points

Hi Elec,

Let me look into this and get back to you when I get more information.

Regards,

Jimmy

+1 Jimmy Hua over 2 years ago in reply to Jimmy Hua

TI__Guru 50120 points

Hi Elec,

The part has been tested for VIN short to battery application, and it does survive.

Please see validation results below. There is negative current into the device, but after short release, the part recovers and regulates back to expected VOUT.

LM61460Q1 - Short-to-Battery Validation.pptx

0 Elec Cheng over 2 years ago in reply to Jimmy Hua

TI__Expert 7055 points

Hi Jimmy,

Thanks for confirm.

BR,

Elec Cheng

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LM61460-Q1: Can LM61460-Q1 handle output short to 14V?