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AM3352: VDDS power sequence with TPS65217C

Gunter Schmer
Genius 14412 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.