I am designing a circuit that runs on a single rechargeable lithium ion polymer battery. The battery does not come with any inbuilt battery protection circuit so I implement my own protection circuit based on S-8261. I followed the same exact design in my application:
The battery is connected to VDD and VSS of the S-8261. And I am using EB+ and EB- as the VCC and GND of my circuit. I also have a 3.3V LDO voltage regulator connected to EB+ and EB-.
The problem I am facing now is that when the battery is connected, there is no voltage on EB+ and EB-. Only when I short circuit battery negative terminal to EB- momentarily , then everything will start working normally. I can remove the short circuit and there is a voltage across EB+ and EB-. I don't know what is the cause of it. Can anyone help or advise?
I recently built a circuit using the same charger but with a boost regulator for the output. The battery I used was a 1AH Lipo from Sparkfun. The battery has built in protection to stop over discharging. I posted the schematic in this thread - is yours similar?
Hi,
I am quite sure my circuit is correct. When you buy a lipo battery with built in battery protection, it has almost the same circuit inside and the two wires coming out from the lipo battery is connected to the + terminal of the battery (red wire) and the EB- (black wire).
I have limitations with the thickness of the battery and none of the lipo batteries in the market with built-in battery protection fits my requirements. I will need a bare lipo battery without the protection circuit and I need to put the battery protection circuit on the PCB instead.
I have limitations with the thickness of the battery and none of the lipo batteries in the market with built-in battery protection fits my requirements. I will need a bare lipo battery without the protection circuit and I need to put the battery protection circuit on the PCB instead.