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BQ24113: Connected via a LTC1479 for Low-noise PowerPath Management Experiences?

Part Number: BQ24113

Hello all, 

I am developing a wireless power transfer battery charging system. Has anybody had experience using the BQ24113 in conjunction with the LTC1479? The datasheet for the LTC1479 suggest using the LTC1511/LTC1510 however I want to take advantage of the bqSwitcher preconditioning and contained package size.

The issue is that the WPT and associated buck converters tend to add significant noise to the power and return ground planes. I would usually run a sensor + processor, connected via a LDO, directly off the charging line of a BQ24113, so that while charging, the LDO is receiving ~4.2V, and when the wireless power is off, the LDO is receiving whatever is still on the battery (say ~ 3.7V). Unfortunately, when applying this method to a new, more sensitive set of sensors, the recorded signals from the sensor+processor are being corrupted by noise.

As such, I am attempting to separate the battery charging power path from the battery supply power path via two batteries and a LTC1479. My thought is that in this way the path directly connecting the wireless power can be better separated from the path connecting the sensitive electronics.

Thanks for any input you might be able to provide.

Regards,

Gregory

  • Do you have a block diagram? LTC1479 is not a wireless power device. It is not clear on your system. 

    what is your charging requirement? looks like you are only charging a 1s configuration. 

    For charger are you looking at standalone? or are you okay with I2C?

    You can probably use a charger with power path function.