TPS7A8500 sequence requirement

K. Sasaki14

According to datasheet, supply and enable sequencing is only required when bias rail is present.
Is there no problem that enable becomes high before VIN is supplied when bias rail is not used?

And Is it OK that VIN and VEN are added before BIAS rail when bias rail is used with the following condition?
VIN: 2V
VBIAS: 3.3V
Vout: 1.2V

Best Regards,
Kohei Sasaki

over 9 years ago

0 Yuanhao Wang over 9 years ago

TI__Prodigy 215 points

Hi Kohei,

In order for the device to remain within the operating range (the range the device is designed, tested, and characterized in), VEN should not exceed VIN.

As such, VEN should always be established after or at the same time as VIN.

Regards,

Yuanhao

0 K. Sasaki14 over 9 years ago in reply to Yuanhao Wang

Guru 10200 points

Yuanhao-san,

Thank you for your answer. I understood.
Is there no sequencing requirement between VIN and VBIAS?

Best Regards,
Kohei Sasaki

0 Yuanhao Wang over 9 years ago in reply to K. Sasaki14

TI__Prodigy 215 points

Sasaki-san,

Yes, as long as you ensure that VEN does not exceed VIN, there is no sequencing requirement between VIN and VBIAS.

Regards,

Yuanhao

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TPS7A8500 sequence requirement