• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 97 subscribers
  • Views 403 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AM3352: VDDS power sequence with TPS65217C

Gunter Schmer
Genius 14222 points
Part Number: AM3352

Hi,

the appnote shows that VDDS should be on LDO1 output.

The customer connected VDDS on LDO3/LS1.

What are the ramifications of having VDDS coming up later in the power-up sequence (STROBE 2 vs STROBE 15)?

Thanks,

--Gunter

  • 0
    TI__Guru**** 393215 points
    The VDDS power supply must ramp down after all 3.3-V VDDSHVx [1-6] power supplies. If it is desired to ramp down VDDS and VDDSHVx [1-6] simultaneously, it should always be ensured that the difference between VDDS and VDDSHVx [1-6] during the entire power-down sequence is <2 V. Any violation of this could cause reliability risks for the device. Further, it is recommended to maintain VDDS ≥1.5V as all the other supplies fully ramp down to minimize in-rush currents.