Type C protection switches safeguard EPR 3.1 designs up to 140W

Alpha and Omega Semiconductor has introduced two protection switches for Type C EPR 3.1. The AOZ13937DI Type C sink and AOZ15333DI Type C source protection switches enable efficient and safe Type C EPR 3.1 designs up to 140W, said the company.

The two switches can increase the power delivery capability of USB Type C ports to 140W, paving the way for Type C extended power range (EPR) implementations. 

The AOZ13937DI is suited for 28V Type C sinking applications while the AOZ15333DI is capable of Type C sourcing applications. The switches are suited for 28V Type C EPR implementations in high performance laptops, personal computers, monitors and docking stations, advised Alpha and Omega Semiconductor.

The AOZ13937DI features a low 20mOhm resistance with soft start, over-voltage, ideal diode reverse current, short circuit, over current, over temperature and ESD protection features. It is designed to isolate and protect downstream components from abnormal Vbus voltage and current conditions. The diode fast reverse current protection allows multiple power paths to be connected in parallel without interference.

The AOZ15333DI companion source switch IC is capable of sourcing 5.0V at 3.0A while blocking up to 28V. AOZ15333DI is UL 2367 and IEC 62368-1:2018 (3rd Edition) -certified as a current limiting switch suited for Type C sourcing applications. The device is protected against numerous fault conditions such as Vin over-voltage protection, startup short circuit protection, over-temperature protection and has a programmable I-limit pin.

Ralph Monteiro, vice president, power ICs at Alpha and Omega Semiconductor, noted: “With the ability to withstand up to +39V on Vbus, the new sink and source switches deliver the safety margin required by our customers to build 28V systems. At the same time, AOS’ high SOA (safe operating area), low RDS(on) trench MOSFETs enable an industry-leading low-resistance 20 mOhm back to back MOSFET, reducing the power dissipation in the system and enabling good thermal design.” 

The AOZ15333DI and AOZ13937DI are available in production quantities with a lead-time of 16 weeks. 

The switches will be exhibited at the APEC 2023 conference in Orlando, Florida, USA (19 to 23 March) at Alpha and Omega Semiconductor’s booth 810.


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