> 6.2.1 | Increasing Charge Current

> If the shunt resistor connected between VSENSE and ISENSE is R shunt = 0.3 Ohms then the maximum fast charging rate is 500mA no matter whether the battery charger is providing more. To enable a higher charger output current it is possible to connect a shunt resistor Rshunt = 0.15 Ohms between VSENSE and ISENSE. In this case the charger output current reaches 1A as calculated below:
> Figure 12: External charging circuit recommended for increased charger output current
> R1 is depending on the gate-source voltage of the used FET and the maximum chargegate sink current. The resistor shall enable the FET just to achieve the full charge current Icharge at a chargegate sink current ICHARGEGATE = -0.5mA. This way, R1 can be assumed to be in the range from 3.9k to 10k.
> Keep in mind that the gate-source voltage varies with the temperature and, sometimes, even product tolerances of the FET.