Circuit of bq27750

yyh9037

Circuit of bq27750 [Copy link]

I want to design a circuit for bq27750. 1. I see that there is an S1 switch in the evaluation circuit of bq27750. I want to ask, is it necessary to add it when I design the circuit? 2. I want to add a switch at the VBAT pin and the load at 2 and 3 in the figure. Will it affect the circuit?

qwqwqw2088

I have answered this in another thread. I still haven't read the evaluation board data clearly. S1 is not necessary. Switches can be added at 2 and 3, but this is not necessary for mass production.

yyh9037

OK, thank you very much for your answer. I have one more question. Is CHGND the same as GND? Can CHGND at the load be replaced with GND? Yes, the negative pole of my load needs to be connected to GND.

qwqwqw2088

yyh9037 posted on 2018-7-17 13:59 OK, thank you very much for your answer. One more thing, I want to know is CHGND the same as GND? Can CHGND at the load be replaced with GND? It's like this, I...

It won't work in a while, you still have to read the manual carefully. If they are connected together, this chip will not work as a monitor. One is the charger and the other is the battery. There is a 1 milliohm power resistor connected in the middle, which is actually a current monitor.