About sequence of two TPS56121 (TPS56221)

Satoshi

Guru 19485 points

Other Parts Discussed in Thread: TPS56121, TPS56221, LM3880

A customer is considering sequence control of two TPS56121(TPS56221).

Can TPS56121(TPS56221) control directly of "PGD pin to EN/SS pin"?

Or, is FET necessary connect between the "PGD to EN/SS"?

Best regards,

Satoshi

over 9 years ago

0 JohnTucker over 9 years ago

TI__Guru**** 191445 points

The PG pin has an internal FET. You just need a pull up resistor to an appropriate voltage rail.

0 Satoshi over 9 years ago in reply to JohnTucker

Guru 19485 points

Dear John Tucker-san

Thank you for reply.

Please teach me additional question.

Is it OK to sequence in LM3880?

When controlling the other devices(Load SW,LDO) to a FLAG pin of LM3880,
customer worry about a current flow from EN of TPS56221/56121, and device damaged.

Best regards,
Satoshi

0 JohnTucker over 9 years ago in reply to Satoshi

TI__Guru**** 191445 points

I have never used the LM3880. But looking at the datasheet for it, that is the intended use. I cannot see any reason why you could not use it.

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About sequence of two TPS56121 (TPS56221)