What heating or environmental characteristics would need to be guaranteed in order to exceed the BQ27421-G1 recommended sense resistor input current of 2000 mA ISRX? Suppose the desired input current was 4500 mA. How would this affect the ambient operating temperature as one variable? For example, instead of being rated for -40 °C to 85 °C, TA might need to be limited to 50 °C (or some other value). Alternatively in order to maintain a TA of 85 °C, then the circuit board must have a heat sink big enough to ensure that the measured package temperature does not exceed xx °C. With these guidelines, customers would be able to safely evaluate how to increase the long term RMS, average device utilization without riskng device damage.
Does the fact that the bq27425-G2 has a 10 mOhm resistor give any increased tolerance for the long term RMS, average device utilization current for the BQ27421-G1 with just 7 mOhm? For example, since P = I2R, then 2390 mA through a 7 mOhm resistor is the same amount of power as 2000 mA through a 10 mOhm resistor.