Current sourcing capacity of internal FET Driver of bq76940 IC

Girish Gangadharaiah

Intellectual 515 points

Other Parts Discussed in Thread: BQ76940

What is the Current sourcing capacity of internal FET Driver of bq76940 IC?

Please let me know if anyone is aware of the answer for the question.

over 9 years ago

0 Vish Nadarajah over 9 years ago

TI__Expert 6085 points

current drive capability of the DSG/CHG pin ~ 2mA Max continuous current. ( this is not spec in the d/s) This number implies, if the DSG/CHG pin is directly shorted to GND, this current can be noted and would NOT damage the bq769xx device. There will no internal electro-migration of the metal systems.

0 Girish Gangadharaiah over 9 years ago in reply to Vish Nadarajah

Intellectual 515 points

So Vish,

If we connect 100K ohms resistor across MOSFET Gate to Source and the MOSFET works fine with our current range (Amps) and no damaging the BQ IC then we are good to use the 100k Ohm resistor?

0 Vish Nadarajah over 9 years ago in reply to Girish Gangadharaiah

TI__Expert 6085 points

The smaller the pull-down ( strong pull-down), faster the shutdown. Should be able to note the difference Tf of the FET operation. The problem of FET damages happen, when the FETS do not shutoff completely and the FETs heat-up.

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Current sourcing capacity of internal FET Driver of bq76940 IC