BQ25176J: How to identify R_ISET value

Hi Gaurav

R_ISET for 100mA = 3k ohms

R_ISET for 50mA = 6k ohms

A common circuit to switch between two charge current levels will use a mosfet to switch in a parallel resistor to increase current.

1.) MOSFET OFF -- only 6k ohm resistor connected to ground -- 50mA 

2.) MOSFET ON -- Add a 2ed 6k ohm resistor in parallel -- 100mA

But the BQ25176J cannot control the MOSFET this would need to be separate circuit that monitors temperature.

Hi Bill,

Thanks for your response.

Bill Johns said:

A common circuit to switch between two charge current levels will use a mosfet to switch in a parallel resistor to increase current.

Do you have any reference design or application note for the same?

Thanks,

Gaurav

Hi Gaurav

See attached circuit, it is for BQ25171-Q1 but will work for any of the BQ2517X family.

Dual charge current -bq2517x.pdf

Hi Bill,

Updated your suggestion in this thread.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1445515/bq25176j-battery-charger-using-usb-type-c

Please review it.

Thanks,

Gaurav