Electronics > Projects, Designs, and Technical Stuff

Coulomb counter IC for coin cell products.

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Psi:
Has anyone come across any tiny coulomb counter ICs for coin cell products.
The sort of thing you could put in a CR2032 powered device that normally lasts around a year and get reliable battery capacity stats from.
Maybe in SOT32-6 or 3x3 or 2x2mm DFN package. Something tiny.
Would need to be very low power, maybe +3uA. and probably need to be under 50c in volume.
Max Current maybe 80mA or so for bursts.

I'm looking myself but have not found anything suited to this.

SiliconWizard:
The BQ35100 may do what you need, and a bit more.
https://www.ti.com/product/BQ35100

Psi:
Needs to be smaller.  Think wearable with tiny PCB.   So like SOT32 / 3x3mm DFN package

Smokey:
BQ27220YZFR ?
https://www.digikey.com/en/products/detail/texas-instruments/BQ27220YZFR/6024316
https://www.ti.com/lit/ds/symlink/bq27220.pdf

If you can't use that little BGA, maybe  BQ27441DRZR-G1A 4mm x 2.5mm?
https://www.digikey.com/en/products/detail/texas-instruments/BQ27441DRZR-G1A/4626408
https://www.ti.com/lit/ds/symlink/bq27441-g1.pdf

ArdWar:
Just go up and down on TI's parametric table. You'll eventually find one in DSBGA/WCSLP package if you really need miniaturization.

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