Current-limiting power switch protects automotive subsystems

August 31, 2021 // By Christoph Hammerschmidt
Current-limiting power switch protects automotive subsystems
The AP22653Q automotive-compliant programmable current limiting power switch from Diodes, Inc. provides a controlled and protected power path,sStreamlining power system design and assuring ongoing reliability.

With a tight accuracy margin of ±7% at high current levels, the AP22653Q’s current limit threshold can be simply set anywhere between 125mA to 1735mA via use of standard value external resistors. The device’s controlled rise and fall times help to mitigate the effect of surges during turn on/off. In addition, its 5μs short circuit response helps avoid situations requiring system shutdown/restart. The device is rated to handle continuous load currents of up to 1.5A. Key applications include protection of vehicle USB ports and ECU supply rails as well as infotainment and telematics subsystems.

The AP22653Q has a 55mΩ (typical) on-resistance, which significantly reduces power loss and voltage drop at high load currents. The reverse-current protection integrated into this device safeguards against reverse currents when peripherals are being externally powered. Overtemperature protection and undervoltage lockout features are also included. An operational temperature range of -40°C to 125°C is supported.

The product is qualified to AEC-Q100 Grade 1, is manufactured in IATF 16949 certified facilities, and is PPAP capable. It is supplied in a compact SOT26 package and has a unit cost of $0.22 in 1000 piece quantities. 

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