ICs guard automotive systems from reverse power
Two diode controllers, the AP74502Q and AP74502HQ from Diodes, provide 80-V reverse battery polarity protection for automotive systems. They also offer load disconnect to guard against overvoltage and undervoltage conditions. Compatible with 12-V, 24-V, and emerging 48-V battery systems—including those in hybrid and electric vehicles—the devices are well-suited for ADAS, body control modules, infotainment, and exterior lighting.
The AEC-Q100 qualified controllers differ in peak gate source current. The AP74502Q handles 60 µA (typical), enabling smooth startup with inherent inrush current control—useful in applications where limiting surge current is critical. By comparison, the AP74502HQ withstands a higher 11-mA peak, allowing quicker MOSFET turn-on with a 1-µs typical response.
Both controllers support input voltages as low as 3.2 V for reliable operation during cold crank conditions and provide a peak gate turn-off sink current of 2.3 A for fast MOSFET switching during voltage events. With the charge pump enabled, their quiescent current is 62 µA, dropping to 1 µA when disabled, minimizing power consumption and battery drain.
Housed in SOT28 packages, the AP74502Q and AP74502HQ cost $0.27 each in 1000-unit quantities.
The post ICs guard automotive systems from reverse power appeared first on EDN.
