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20-V, 7-A USB Type-C sourcing protection switch boosts safety/efficiency

20-V, 7-A USB Type-C sourcing protection switch boosts safety/efficiency

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By Jean-Pierre Joosting



Alpha and Omega Semiconductor Limited (AOS) has released its AOZ1377DI Type-C protection switch, which is designed to enhance USB Type-C efficiency and safety.

The USB Type-C protection switches have a current-limiting switch targeting applications that require comprehensive protections. AOZ1377DI boasts a unique feature supporting up to 7 A with an input voltage of up to 20 V input voltage, making it versatile for both Sink and Source applications.

The AOZ1377DI USB Type-C protection switch offers advanced features that significantly reduce voltage drop and power loss compared to back-to-back p-channel devices typically used in such applications. The device supports an input operating voltage range of 3.4-V to 23-V, with both VIN and VOUT terminals rated at a maximum of 28 V, and is capable of up to 7 A. These devices are ideal for high-power applications requiring multi-port Type-C PD 3.0 current source supporting up to 100 W. They are particularly well-suited for use in high-performance laptops, personal computers, monitors, docking stations, and other Type-C port applications.

The AOZ1377DI has a True Reverse Current Blocking (TRCB) protection, which prevents undesired reverse current from VOUT to VIN. It also features an internal current-limiting and short-circuit current limit that protects the source device from large load current. The current limit threshold can be set externally with a resistor. Furthermore, the integrated back-to-back MOSFET delivers the industry’s lowest ON resistance and highest SOA to safely handle high currents and a wide range of output capacitances on VOUT. An internal soft-start circuit controls inrush current from high capacitive loads, and an external capacitor can adjust the slew rate.

In addition, it has a wealth of protection features, including input Under-Voltage Lock Out (UVLO), Input Over-Voltage Protection (OV), and Thermal Shut Down Protection (TSD). In shutdown, the device consumes a mere 3 μA.

“The AOZ1377DI USB protection switch offers a highly integrated solution for Type C sourcing up to 20 V and is capable of sourcing over 140 W for systems implementing a high-power source. To simplify system compliance testing, the AOZ1377DI is UL 2367 and IEC62368-1 certified,” said Jongchul Song, Sr. Marketing Manager for Protected Switch products at AOS.

AOZ1377DI comes in two variants: AOZ1377DI-01 will automatically restart once fault conditions are cleared, whereas AOZ1377DI-02 will latch the power switch off, and the EN must be reset to restart the device.

Technical highlights include:

  • Back-to-back N-channel MOSFETs with 19 mΩ typical ON resistance
  • 3.4 V to 23 V operating input voltage, VIN, and VOUT rated at 28 V abs maximum.
  • Programmable current limit
  • True Reverse Current Blocking (TRCB)
  • Programmable soft-start, Short Circuit Protection (SCP), VIN discharge
  • VIN Under-Voltage Lockout (UVLO), VIN Over-Voltage Protection (OVP), Thermal Shutdown Protection (TSD)
  • IEC61000-4-2: ±8K
  • IEC61000-4-5: 40 V on VOUT, no capacitor
  • IEC62368-1:2018 (3rd Edition)
  • UL2367 recognition
  • AOZ1377DI-01 (Auto-Restart) and AOZ1377DI-02 (Latch-off)
  • Thermally enhanced DFN3x3-10L package

www.aosmd.com

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