BQ34Z100: BQ34Z100

There is no need to add mosfet between VCC and REGIN ,3.3V VCC is the same as 1-cell voltage,is it right?

1. I test the voltage,when VCC is 3.3V,then REGIN is 2.1V,but BQ34Z100 need 2.7~4.5V for REGIN, BQ34Z100 does't work. Could I delete R75,D13 and Q15 ?

Can you share your latest schematic? 

2. The same I2C line is pulled up to 3.3V, will it impact BQ34Z100 communicate through EV2400 to computer?

It should not.  Have you seen any issues? 

Andy

Here the consumption current into REGIN is too much.

When B7-B- voltage is 25V, VCC-B- is 3.3V, the consumption current into REGIN is 2.5mA  and it will always be so much.

Hi, 

You mean you already remove the R75,D13 and Q15, and test the REGIN is 2.1V, consumption current is 2.5mA?

Thanks.

Best regards

Mason

remove the R75,D13 and Q15, and test the REGIN is 3.3V, consumption current is 2.5mA

It's so big that I have to delete BQ34Z100 and use other solution to solve my trouble.

Hi,

How did you measure the consumption current? By the pull-up resistor? 

Best regards

Mason

YES

Can we get a scope capture of the current waveform across that resistor? Is this a continuous 2 mA?