DRV8424: About the nSLEEP pin

Ryu Yamashita

Part Number: DRV8424

Hi team,

Why is the maximum absolute rating of the nSLEEP pin set to VVM?
What happens if a voltage is applied to nSLEEP when no voltage is applied to VVM? In case of failure, what is the failure mode?

Sincerely.
Ryu.

over 4 years ago

+1 Pablo Armet over 4 years ago

TI__Mastermind 37683 points

Hi Ryu,

The absolute VM max is 35V. If there is 0-V at VM of if the power source is disconnected, the device will shutdown. All of the internal circuitry will not be powered so the device will remain in shutdown mode regardless of nSLEEP value.

0 Ryu Yamashita over 4 years ago in reply to Pablo Armet

Genius 3625 points

Hi Pablo,

Thanks for reply.
In other words, does it matter if voltage is applied to nSLEEP while it is in shutdown mode?
I want to make sure there's nothing to break.

+1 Wang5577 over 4 years ago in reply to Ryu Yamashita

TI__Guru 56650 points

Yamashita-san,

DRV8424 should be safe even a voltage is applied to nSLEEP when no voltage is applied to VVM.

A high voltage rating on nSLEEP pin can avoid the device damage when there is a solder ball between CPL pin and nSLEEP pin.

Regards,

Wang Li

0 Ryu Yamashita over 4 years ago in reply to Wang5577

Genius 3625 points

Hi Wang

Thanks for reply.
I understand that the device is undamaged.
It's the same as the first question.
Why is the maximum absolute rating of the nSLEEP pin set to VVM?

Regards,
Ryu

+1 Wang5577 over 4 years ago in reply to Ryu Yamashita

TI__Guru 56650 points

Yamashita-san,

The maximum absolute rating of the nSLEEP pin is set to VVM to avoid a customer board soldering issue (a solder ball between CPL pin and nSLEEP pin) damages the DRV8424 because nSLEEP pin and CPL pin are adjacent pins.

Otherwise, nSLEEP pin can be damaged by shorting to CPL pin.

Regards,

Wang Li

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DRV8424: About the nSLEEP pin