BQ24079QW-Q1: Choice of a Battery charger IC

Hello Daniel,

Thanks for reaching out. I'd be happy to help find a charger that fits your application.

I have a few questions to better understand your requirements:

Do you need an I2C-controlled charger, or would a standalone charger (with resistor configuration) work for your design?

You mentioned that the system load must be disconnected while charging because it may exceed 3W. Typically, power path allows the input to power the system and charge the battery at the same time. If you need to disconnect the system load completely, you will likely need an external load switch. Some chargers, such as the BQ2407x family, have a SYSOFF pin that can disconnect the battery from the system, but this also disables charging. Would you need this function integrated into the charger, or would an external load switch be acceptable?

For battery status, do you need voltage and current measurements (ADC readings), or do you only need to know charging status and fault conditions?

Best regards,

Alec

Hello Alec ,

I prefere a standalone charger BUT I2C is also accepted , 

A load switch is ok , If it's the only way , indeed  the system load has to be disconnected WHILE charging OR the Battery has to be prioritized to power the system load

Finally the system load may be consume around 6W (3.3V)  from the batteries thanks to a Buck boost ( TPS62XX) after the IC charger.

All kind of batteries status is welcome ( I2C or charging satus )

One more condition , i would prefere a non BGA pakage .

Thanks for Helping me  

Hello Daniel,

Our chargers with power path will power the system load from the input source while charging the battery. This means the battery won't supply the system load as long as an input is connected, unless the system load exceeds what the input can provide, in which case the battery helps supplement it. Without an input source connected, the system load is powered by the battery. Let me know if this behavior works for your application — if so, you may not need an external load switch.

Do you prefer a linear or switching charger. Are there space constraints? What is your expected charge current into the battery?

For a linear charger, I'd recommend the BQ25185 (1A standalone linear charger, WSON package). For a switching charger, I'd recommend the BQ25308 (3A standalone buck charger, WQFN package).

You can also search for battery chargers in our parametric part search tool here: https://www.ti.com/battery-management/charger-ics/products.html

Best regards,

Alec

Hello 

Due to Main power input restriction 2W / 5V 

Mode 1: The system Load is Idle ( low power 50ma )

In this mode i 'd like to charge the battery and power the load at the same time. ( charging current approx 300mA)

Mode 2 : Operationnal : The system Load is awake at full power (2A from the batteries )

In this mode i want the charger to be disconected and no power from the main input should power the Load but only the battery.

Hi Daniel,

To support the 2A load, I recommend a switching charger.  Does BQ25606 meet your needs?

Regards,

Charles Harthan