TPS62872-Q1: Series Resistor Connected to EN

Dice-K

Mastermind 7703 points

Part Number: TPS62872-Q1

Tool/software:

Series Resistor Connected to EN

Hi support team,

I understand that the EN pin must have a series resistor of 15kΩ or more.

Is it okay to simply use a pull-up resistor as shown in the diagram below?

TPS6287x-Q1_EN.pdf

Regards,
Dice-K

3 months ago

+1 Excel Regidor 3 months ago

TI__Mastermind 38931 points

Hi Dice-K,

Thanks for reaching out.

As long as you are sure that the GPIO and PG pins are not internally biased (or in open-drain configuration), it can be directly connected to EN pin of the device.

Best regards,

Excel

0 Dice-K 3 months ago in reply to Excel Regidor

Mastermind 7703 points

Hi Excel,
Thank you for your reply.

Since GPIO and PG are open drain, I understand that there is no problem with the circuit as it is.

Best regards,
Dice-K

0 Excel Regidor 3 months ago in reply to Dice-K

TI__Mastermind 38931 points

Hi Dice-K,

If you don't have further queries, I'm closing the thread now.

Thanks!

Best regards,

Excel

0 Dice-K 3 months ago in reply to Excel Regidor

Mastermind 7703 points

Hi Excel,
Please allow me to ask one additional question.

Is it okay to use a 10kΩ pull-up resistor for the EN pin?
There is no series resistor between the TPS652190's GPIO and the TPS6287x-Q1's EN pin.

TPS6287x-Q1_EN_2.pdf
Doesn't the following statement mean that the pull-up resistor must be 15kΩ or greater?
"The user must connect to this pin using a series resistor of at least 15kΩ."
The reason I'm checking is because the TPS65219x checklist states that the typical value is between 1kΩ and 10kΩ.

Best regards,
Dice-K

+1 Excel Regidor 3 months ago in reply to Dice-K

TI__Mastermind 38931 points

Hello Dice-K,

The minimum current limiting (series) resistor on EN pin must be at least 15K. Hence, 10K pull-up resistor is not enough.

I suggest to post a separate query here (E2E platform) about using a higher pull-up resistor (=> 15K) on GPIO of TPS65219x.

Best regards,

Excel

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TPS62872-Q1: Series Resistor Connected to EN