TPS65381A-Q1: VDD3/5 power up

Mohamad Salameh

Part Number: TPS65381A-Q1

Hello,

Regarding Figure 6-12 in the datasheet (shown below), what determines the highlighted condition 'VDD3/5 Powered Up?' ? At what voltage level the VDD3/5 is considered powered up?

The VDD3/5 is configured as 3.3V.

Thank you,

Mohamad

over 3 years ago

+1 Alex Saenz over 3 years ago

TI__Expert 6700 points

Hi Mohamad,

The VDD3/5 regulator would be considered powered up whenever the UV threshold is exceeded. This is guaranteed to happen by 3.21V on the 3.3V setting or 4.85V on the 5V setting.

Regards,

Alex

0 Mohamad Salameh over 3 years ago in reply to Alex Saenz

Prodigy 10 points

Hi Alex,

Thank you for the information.

Accordingly, if the VDD3/5 fails to ramp to the UV threshold, the PMIC will stay in reset mode, is that right?

I’m observing that the regulators ( 5V and 3.3V and VDD1) are not ramping to the UV thresholds, and the reset pin stays low. At the same time VDD6 is constant/stable at 6V.

Would an over-temperature fault turn off the VDD6?

I have recorded the waveforms of the regulators during the fault, is it possible to share it via email and continue discussion?

Thank you,

Mohamad

0 Alex Saenz over 3 years ago in reply to Mohamad Salameh

TI__Expert 6700 points

Hi Mohamad,

Yes we can close this ticket and move this to email a-saenz@ti.com.

Regards,

Alex

0 Mohamad Salameh over 3 years ago in reply to Alex Saenz

Prodigy 10 points

Thank you, Alex.

I sent the data via email.

Regards,

Mohamad

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TPS65381A-Q1: VDD3/5 power up