Diodes Incorporated has introduced the AP74502Q and AP74502HQ automotive-compliant 80-V ideal diode controllers, designed to support protection and power efficiency in a range of vehicle electrical systems, including hybrid and battery electric vehicles (EVs).
These devices provide reverse polarity and transient voltage protection and are suitable for 12, 24, and the emerging 48-V architectures. Applications include advanced driver assistance systems (ADAS), body control modules, infotainment systems, exterior lighting, and USB charging ports.
With an 80-V input capability, the controllers are aligned with the growing adoption of 48-V systems in EVs. These higher-voltage systems enable electric turbochargers, regenerative braking, and zonal power distribution strategies, which reduce wiring complexity and support increased electronic functionality.
The controllers incorporate a load disconnect feature for overvoltage and undervoltage conditions, enabling energy to be returned to the input rail and making them adaptable for systems with bidirectional energy flow. They can also be configured as surge stoppers for additional protection against load dump transients.
Both devices operate down to 3.2 V, ensuring functionality during cold crank events. A peak gate turn-off sink current of 2.3A enables fast disengagement of the external N-channel MOSFET during fault conditions.
In normal operation, the quiescent current is 62µA (enabled) and 1µA (disabled), minimizing system power draw. The AP74502Q offers a typical 60μA gate source current for controlled start-up and inrush management, while the AP74502HQ delivers a stronger 11mA gate source current for faster turn-on times, typically within 1µs.
Both controllers are available in SOT28 packages and support an operating temperature range from -40° to +125° C.
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