JAJSL08H september 2009 – february 2021 BQ24040 , BQ24041 , BQ24045
PRODUCTION DATA
An external resistor is used to Program the Output Current (50 to 1000mA) and can be used as a current monitor.
where
For greater accuracy at lower currents, part of the sense FET is disabled to give better resolution. Figure 7-1 shows the transition from low current to higher current. Going from higher currents to low currents, there is hysteresis and the transition occurs around 0.15A.
The ISET resistor is short protected and will detect a resistance lower than ≉340Ω. The detection requires at least 80mA of output current. If a “short” is detected, then the IC will latch off and can only be reset by cycling the power. The OUT current is internally clamped to a maximum current between 1.05A and 1.4A and is independent of the ISET short detection circuitry, as shown in Figure 8-5. Also, see Figure 9-14 and Figure 9-15.