TPS542941: About VIN shutdown current

Hide

Guru 21045 points

Part Number: TPS542941

Hi Team,

Our customer measured VIN1 and VIN2 shutdown current at VIN1=VIN2=12V, EN1=EN2=LOW.

Then, VIN1 current is around 110uA and VIN2 current is around 0uA.

So, VIN current is inclined to VIN1 pin.

Is this correct behavior?

If yes, could you please let us know this cause?

Regards,

Kanemaru

over 5 years ago

0 Jason Wang (BSR-MV) over 5 years ago

TI__Genius 9550 points

Hi,

Please refer dagtasheet page 6, as below:

VREG5 (internal circuit power supply) is from VIN1.

Dataheet page 3, EC table, VIN shutdown current, max 150uA, so your test result is reasonable.

0 Hide over 5 years ago in reply to Jason Wang (BSR-MV)

Guru 21045 points

Hi Jason-san,

Thank you for your prompt reply.

I understand. Thank you very much.

Regards,

Kanemaru

0 Hide over 5 years ago in reply to Hide

Guru 21045 points

Hi Jason-san,

I have one more question.

Our customer separate VIN1 (So VIN1=Open and VIN2=12V) at shutdown.

Because, they would like to reduce shutdown current.

Do you have any problems with this usage?

Regards,

Kanemaru

0 Jason Wang (BSR-MV) over 5 years ago in reply to Hide

TI__Genius 9550 points

Kanemaru,
I think the structure is acceptable and no problem.
But, please send email to SamZhang for EVM test confirm. sam.zhang@ti.com

0 Hide over 5 years ago in reply to Jason Wang (BSR-MV)

Guru 21045 points

Hi Jason-san,

Thank you for your prompt reply.

I send e-mail to Sam Zhang-san.

I’d greatly appreciate your verification.

Regards,

Kanemaru

0 Hide over 5 years ago in reply to Hide

Guru 21045 points

Hi Jason-san,

I received automatic replay from Zhang-san.

Could you plaease let us know your address?

Regards,

Kanemaru

0 Jason Wang (BSR-MV) over 5 years ago in reply to Hide

TI__Genius 9550 points

Hi,
Hao will give you feedback today.

0 Sam(MPAA) Zhang over 5 years ago in reply to Hide

TI__Mastermind 19080 points

Hi Kanemaru,

I've checked your application on EVM. There is no issue.

When VIN1=0, VIN2=7.2V, EN1=EN2=0, there is no voltage on either output, nor the other VIN.

Regards,

Sam

0 Hide over 5 years ago in reply to Sam(MPAA) Zhang

Guru 21045 points

Hi Sam-san,

Thank you for the information.

I understand. Thank you very much.

Regards,

Kanemaru

Power management

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TPS542941: About VIN shutdown current