![lipo battery monitor circuit lipo battery monitor circuit](https://5.imimg.com/data5/SELLER/Default/2022/8/YW/IL/QC/1092568/brass-battery-connector-250x250.jpg)
This of course requires an external 12~20V power adapter. As I would like to quickly charge them, I implemented a switching mode charger circuit using the LTC4002, set to 2A charging current. Just as a follow-up and feedback, I would like to share the results of the development so far. I'd still go with multiple cells and custom charger/balancer. To be on a completly safe side you'd have to calculate boost converter such, that it can continuously output peak current. Peak currents could be handled with larger output cap, but that depends on expected length of the peak. Boost converter for motors can prove to be rather beefy, as Iin>Iout*(Vout/Vin). Or you use separate boost converter to generate ~4.5-6V and then drop it with linear regulator. Other major players like TI, ON, NXP or Microchip should also have something. LTC3440 comes to mind, and also one from Maxim, but I cannot recall the number right now. There are specialized ships that do just that, even with single inductor. 3.3V is somewhat inconvenient, because in order to get that from a single cell you need a buck-boost converter as the cell voltage varies roughly from 2.9V to 4.2V. Most logic nowadays runs fine from 3.3V, and some even from unregulated li-io voltage.
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You can use a big boost converter for powering motors and a separate one for powering logic. Any opinions, experiences, tips are welcome in the topic. And when we talk about li-ion safety in a consumer device, I would rather not take reliability lightly. I read about custom charger and monitor solutions with voltage references, op-amps, ADC-s with a single microcontroller, but to develop a reliable and accurate custom solution from ground up seems a whole lot of work, knowledge and experience in this area. I am surprised that I haven't found a single charger IC with balancing capability! - Is there a simpler / cheaper / more integrated solution? Other than building the whole circuit from 3-4 different chips? - Best way to measure SoC? I don't need ultimate precision, but enough to keep the user happy with more or less reliable reports, and to be able to fully utilize battery capacity. Balancer IC-s are rare, and ofter part of a complex monitor chip. My quetsions - Do I need balancing? My understanding is that the average discharge rate is below 1C, balancing is not crucial. ), but often they are wildly complex for my application, or expensive, and I would prefer leaded packages for hand soldering, which narrows the possibilities. I did my research on the various IC-s of different manufacturers (TI, Linear, Microchip, Maxim. Optionally, a balancer solution would enhance battery life and safety. (The supply will be an external 12V wall charger) - And I need the State of Charge of the battery, preferably with a coulomb-counting based method, as the OCV (open circuit voltage) -based solutions are inaccurate, especially during charge/discharge. I definitely need some kind of battery protection (under-, and over-voltage, over current, short-circuit) - I also need a charger solution with 1.5-2A charging current. The battery pack I use is a bare 2S puch cell pack with no internal protection circuit.
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The peak current draw can be up to 4A, the average is around 0.5A (uC, motors, LEDs). Hi, I'm designing a full-fledged battery management solution for a 2S Li-po battery pack in a custom consumer electronics device.