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BQ25703A: default input current setting

Ajay Kumar55
Prodigy 200 points
Part Number: BQ25703A

Hi I am using BQ25703A and want to set the default current to 4A when adapter is connected.

VILIM_HIZ (2.6V) = 1V + 40 * (VACP - VACN ) = 1+ 40 *IDPM *RAC

I could not find the value of IDPM.

if i Put the RAC as 7mOhms, will BQ25703A default input current limit  change to 4A when adapter will be connected? On Power on my Microprocessor is off and i can not set register using i2c. 

  • 0
    TI__Prodigy 420 points

    VILIM_HIZ (2.6V) = 1V + 40 * (VACP - VACN ) = 1+ 40 *IDPM *RAC

    In this equation, IDPM is the input current limit set by the ILIM_HIZ pin. For example, if you would like to set IDPM=4A with a 10mohm RAC, you should set the VILIM_HIZ= 1V + 40 * 4A * 0.01 ohm = 2.6V.

    For RAC, bq25703A only supports two options, 10mohm and 20mohm. You can not use 7mohm as the input current sensing resistor.

    Upon power on, the I2C IDPM register default is 3.25A, if you set the external ILIM_HIZ pin as 4A, charger will recognize the lower one as the default IDPM. So without I2C writing, you are not able to set the IDPM as 4A after power on.