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Help identifying IC?

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iXod:
What is the risk of replacing Rcc with a 0 \$\Omega\$ device? The 18650 has its own protection board. (The protection board wasn’t part of the original design, but came wih the higher capacity cell I upgraded to.)

jhpadjustable:
Reduced cycle life, blown TP4057, possibly fire. The battery's protection IC is intended to protect property and life against extreme overstress events without otherwise getting in the way. Its protection likely doesn't include charging overcurrent. Look it up to be sure. The 200mΩ is intended to protect the battery's cycle life and the charger IC in regular use. Belt-and-braces.

iXod:
Thanks JHP.

Another Q: the datasheet page discussing thermally regulated charge rate (see attached in earlier post) shows an example of how to calculate this. But Rprog isn't used in the calculation. Rprog is totally ignored here?

I'm trying to understand how the charge rate is changed from its normal value (determined by Rprog) to the thermally-regulated value (determined by Rcc). Kind of hard to do without knowing the normal Ibatt value...

Thanks.

Yansi:

--- Quote from: jhpadjustable on November 30, 2019, 08:20:48 pm ---Replace the R with a decimal point. It's a 200mΩ resistor. That's probably exactly why it's there: cheap insurance.

--- End quote ---

No it is not. The input series resistor is described in the TP4056 datasheet. It is to spread the heat load on the device across multiple components.

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