BQ25150: Technical questions from my customer

Jeff Coletti

Part Number: BQ25150

Hi Support team

My customer has designed in bq25150 into their product.

They also want to design a gang charger for extra batteries and would like to use the bq25150 to keep the firmware the same.

they are asking for help with these questions:

If we use this charger IC for our new gang charger ( 8-battery in total, CC/CV= 350mA/4.4V each), is there any thermal concern? Does TI have any thermal analysis data and test report that can share with us?
If we don’t need power potion of BQ25150, do we need to do any to BQ25150’s PMID or LS/LDO pins? PMID add 3uf cap, LDO keep disabled? Please confirm
As we know that California Energy Commission compares the energy consumed by the batteries being fully discharged after being fully charged, to the energy consumed at the AC power line by the unit’s power supply. There is an equation requiring a minimum efficiency. Since BQ25150 is a linear charger IC, is there any problem here? Does TI have some test data to confirm no issue here?

Thanks

Jeff C

over 6 years ago

0 Gautham over 6 years ago

TI__Genius 12485 points

Jeff,

1. For thermal concerns, we can run some estimates from the datasheets for power loss and their operation modes. I will check to see if i can share some thermal data.

2. Are you referring to powerpath? Then yes, you don’t have to do anything extra. Just adding capacitance on PMID is okay.

3. Is the mandate during the charger being present and charging complete? The device itself consumes very low power for itself so we haven’t heard of any issues here.

Regards,

Gautham