BQ24032A: Can DPPM pad be tied to ground?

Richard Friederich

Part Number: BQ24032A

In my application, I intend to set RDDP to its minimum value, as I do not need DPPM or short circuit protection. Is there a valid reason for not simplifying my circuit by simply grounding the DPPM pad?

over 7 years ago

0 Raheem over 7 years ago

TI__Mastermind 21590 points

Hello,

The minimum DPPM voltage is 2.6V. You can pulse the pin to below 1V but that is recommended only for a short amount of time.

Regards,

Raheem

0 Richard Friederich over 7 years ago in reply to Raheem

Prodigy 240 points

Thank you for the reply. What you say is clear from the datasheet, but I am asking if there are any undesired consequences of shorting DPPM to ground, recognizing that short circuit protection would not work. Could the IC be damaged in the long term (say, years)?

0 Richard Friederich over 7 years ago in reply to Richard Friederich

Prodigy 240 points

PS: I recognize that this is not recommended by TI.
Thanks

0 Richard Friederich over 7 years ago in reply to Raheem

Prodigy 240 points

Please see my subsequent messages of Nov 3 - I'm asking about behavior under conditions not specified in the datasheet.

0 Raheem over 7 years ago in reply to Richard Friederich

TI__Mastermind 21590 points

Richard,
The reason why you dont want to tie DPPM to ground is that the DPPM voltage will be set to zero. The DPPM feature is there to increase the output current if the output voltage drops too low (to the V(DDPM-SET) voltage) by reducing the charging current. When this occurs with DPPM tied to ground, the output voltage drops to the battery voltage while the input current will be at the maximum limit. This will increase power dissipation due to the high input current and voltage difference between VIN and VBAT which will cause your device to run hot and be inefficient.

Regards,
Raheem

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BQ24032A: Can DPPM pad be tied to ground?