TPS23861: Power on sequence in SLVA723

Charles Jeon

Expert 2975 points

Part Number: TPS23861

Hi Team

The power sequence in the TI document (SLVA723) is shown below.

If not following the above sequence, can the product be damaged?

over 6 years ago

0 Thomas Lewis over 6 years ago

TI__Expert 5615 points

Charles, Yes it can. It is important to guide the end customer to follow this power up sequence. The device datasheet also has this warning in a few locations.

Thank you for supporting PoE products from Texas Instruments,

0 Charles Jeon over 6 years ago in reply to Thomas Lewis

Expert 2975 points

Dear Thomas

If I do not match the power sequence, could it happen burnt VDD or VPWR of TPS23861?

Thank you

0 Thomas Lewis over 6 years ago in reply to Charles Jeon

TI__Expert 5615 points

Charles, At this point, it is better to hand you over to the PSE Application Engineer. Penny is the expert on what could go wrong with the IC if proper power up sequence is not followed.

Thanks,

0 Penny Xu over 6 years ago in reply to Charles Jeon

TI__Genius 15685 points

Hi Charles,

If you don't follow the power on sequence, VDD or VPWR will not be burnt but the device will not be full functional. You could see the device doesn't turn on the port or the class current measurement is not accurate. So it is very important to follow the power on sequence described in the app note. Thanks.

Best regards,

Penny

Power management

Power management forum

TPS23861: Power on sequence in SLVA723