TPS7A94: PG operation at 0.4V output

Alexander Skulsky

Intellectual 270 points

Part Number: TPS7A94

According to the datasheet for proper PG operation, the Vout must be above 1.2V.

I use this LDO for 0.4V output. and PG operation is a must-have in my design.

How will the current limiting and PG operate in this case and what are the values of the FB_PG resistor recommended?

Regards

Alex

over 2 years ago

0 Nick Butts over 2 years ago

TI__Mastermind 37965 points

Hi Alex,

I am reaching out to our design team to get this information. I realize that the preliminary datasheet does not clearly indicate why Vout must be above 1.2V for PG to function properly. Please allow 1-2 business days to get back to you.

Regards,

Nick

0 Nick Butts over 2 years ago

TI__Mastermind 37965 points

Hi Alex,

I am communicating with design about this still. Please allow an additional 1-2 business days. I apologize for the delay.

Regards,

Nick

+1 Nick Butts over 2 years ago

TI__Mastermind 37965 points

Hi Alex,

PG should still work down to VOUT = 0.4V because the PG trip mechanism is a simple comparator that compares the voltage at FB_PG to an internal reference. It is the current limit setting that will not work reliably with VOUT < 1.2V and in this case the only option is 100% default current limit.

Regards,

Nick

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TPS7A94: PG operation at 0.4V output