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DV2004S1 demo board and BAT+ voltage

Other Parts Discussed in Thread: BQ2004E

For the DV2004S1 demo board, would someone please confirm something for me before I implement the circuit? Question is about the voltage at the BAT+ pin, or the connection between L1 and C1. I know L1 is used to limit / control the current being charged (monitored by the SNS pin as current passes through RSNS). I would like to know what the maximum voltage would be at this point for a 2-AAA NiMH battery system? Is it limited by the batteries at the 2.5V and Ichg*RSNS, and the BAT monitor of the IC? I have a small low voltage circuit hanging at this point and it cannot go above 5V before potentially damaging things. The spec sheet on the BQ2004E does not really specify the trip voltage. Though it does say it can handle a 2-cell charge; which means the 2.5V is implied.

Would like to see this confirmed by someone knowledgeable.

  • I was looking at the schematic more and question the need of R13 - connected between dc supply and BAT+. I do understand the parallel of D8, but D8 seems to be useless if the dc supply is much higher than BAT+ could be (ie 25V for dc supply and charging 2 cells). Any insight to this?