TPS53355: PG pin Max Current

Shinu.V.Mathew

Genius 10390 points

Part Number: TPS53355

Hi Team,

Can you please help with the max current capability of PG pin of TPS53355.

Regards, Shinu Mathew.

over 7 years ago

0 Henry Nguyen over 7 years ago

TI__Intellectual 2460 points

Hi Mathew,

Page 7 of datasheet has PG pull down resistance with min/max information. Also, PGOOD section on page 17 recommended to pull up this pin to VREG.

To find the maximum current of this PG FET, you can take the maximum voltage of VREG divided the minimum of PG pull down resistance. However, we don't recommend tie this PG pin directly to VREG and recommended to pull up to VREG with 100kOhm. As result, the current flows through PG FET minimal when the PG signal low.

May I know your reason or concern of your question?

Kit

0 Shinu.V.Mathew over 7 years ago in reply to Henry Nguyen

TI__Genius 10390 points

Hi Kit,
Thanks for the reply.
I think the parameter given in 7th page is FET RdsOn ie, 30E(typ) and considering Vreg of 5V(typ) can the PG FET capable to handle 166mA current?. Not able to find 100kOhm pull up resistor recommendation other than in typical application circuit.
Can you please help with the max current rating of PG FET.
Customer need this data for design analysis.

Regards, Shinu Mathew.

0 Henry Nguyen over 7 years ago in reply to Shinu.V.Mathew

TI__Intellectual 2460 points

Hi Mathew,

Can you tell us more details how the customer plan to implement the PGOOD circuit? Will the PG circuit pull up to VREG or external power supply?

If it pull to the VREG, the VREG LDO can only handle 30mA (page 6). I can ask the IC design more details of its handling current.

Kit

0 Henry Nguyen over 7 years ago in reply to Shinu.V.Mathew

TI__Intellectual 2460 points

Hi Mathew,
PG FET can only handle up to 22mA.
Kit

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TPS53355: PG pin Max Current