Diodes Incorporated introduces adjustable 3.5 A, automotive-compliant, current-limited power switches to improve the durability of USB ports. The AP22654Q and AP22655Q are single-channel, adjustable, current-limited switches optimized for automotive applications that require precision current limiting.
Their programmable current-limit threshold adjusts between 400 mA and 3500 mA (typical) via an external resistor, enabling them to support continuous load currents up to 3.1 A.
The AP22654Q’s active-low enable and AP22655Q’s active-high enable both feature a low 50 mΩ RDS(on) high-side MOSFET, which offers lower power dissipation and lower inline voltage drops.
Output rise and fall times are controlled, which helps minimize current surges during turn on/off, enabling them to be used in applications subject to heavy capacitive loads.
Both devices have a comprehensive suite of protection features including short-circuit, reverse-current blocking and limiting, overcurrent, overtemperature, and short-circuit protection, as well as under-voltage lockout functionality. Their open-drain Fault Flag has a 6 ms deglitch time which prevents false overcurrent reporting.
Both are available in the TSOT26 (Type A1) package and support ambient temperatures from -40 ºC up to +125 ºC.
Key features
- Tight Tolerance Adjustable Current Limit from 0.4 A to 3.5 A
Implements a single device across platforms with one resistor change and allows closer matching of current limits to system requirements
- 50 mΩ RDS(ON) High-Side MOSFET
Offers lower power dissipation and lower inline voltage drops
- Fast Short-Circuit Response Time: 5 μs
Prevents unnecessary system shutdown or restart, which improves system robustness
- Reverse-Current Protection: Blocking During Shutdown and Current Limiting While Enabled
Protects system from reverse currents when peripherals are externally powered
- Robust Protection Features Set with Fault Reporting Overcurrent (Limiting), Output Overvoltage, and Thermal Shutdown
Improved robustness of USB ports
Key applications
Automotive USB Port overcurrent protection:
- USB-C port in infotainment
- USB ports in the rear cluster
Click here to learn more about AP22654QWU-7
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