AOS Announces New Type-C Power Delivery 2-in-1 Combo Protection Switch

Alpha and Omega Semiconductor Limited (AOS), a designer, developer and global supplier of a broad range of power semiconductors and power ICs, announced a new Type-C Power Delivery compliant 2-in-1 combo protection switch capable up to 28V absolute maximum voltage. The AOZ1380 is a smart protection switch combining both current source and sink function into a single small thermally enhanced 3mm x 5.2mm DFN package. Made possible by AOS’ advanced co-packaging technology, AOZ1380 combines a high-performance IC with protection features and AOS’ state-of-the-art high SOA MOSFET. This new device provides true reverse current blocking intended for applications where protection from exposure to high voltages is required. The AOZ1380 provides an ideal solution for the latest notebooks, ultrabooks, Chromebooks, and docking stations, with Thunderbolt/USB Type-C PD ports.

Image courtesy of Alpha & Omega Semiconductor.

In the sinking application, two discrete back to back MOSFETs along with resistors and capacitors provide soft start functionality to prevent Type C power adaptor brownout at the plugin. However, programmability and protection features such as reverse-current blocking and over-voltage and over-temperature protection are lacking in this implementation.  As a Type C port must also provide power delivery of up to 15W in a notebook application, there's also a need for a 5V current limited load switch with protection features. The AOZ1380 provides all this functionality and reduces board footprint by over 50% compared to competing solutions.

The internal back to back discrete MOSFET that provides the sinking path has a low 20mOhm source to source resistance of 20mOhm. Manufactured on AOS’s high SOA hot-swap platform of trench MOSFETs, it has high SOA in soft start conditions. The ultra-low resistance enables high continuous current of 7A and peak currents of up to 20A, making it an ideal load switch for notebook applications where high peak current capability from the adaptor is needed for CPU or GPU turbo mode events. The AOZ1380 also supports the sinking switch requirements with the fastest response time in the industry to support fast role swap events.

“The thinner profile, higher power, and greater flexibility offered by USB Type-C and USB PD 3.0 standards have prompted many computer manufacturers to drop the barrel jack in favor of USB Type-C ports for charging their notebook and ultrabook offerings. The unique combination of AOS’ high SOA MOSFET technology and controller ICs enables system designers to achieve a compact footprint while enhancing the reliability of the Type C port,” said Peter Cheng, Power IC Senior Marketing Director at AOS.

Technical Highlights

• Operating Range: 3.4V to 22V for sink path and 3.4V to 5.5V for sourcing path
• 28V Absolute Maximum rating at VBUS•On Resistance: 20mΩ for sink and 39mΩ for source
• 20A peak sink current for 10ms @ 2% duty cycle
• Common protection features: True Reverse Current Blocking, Under-Voltage Lock-Out, Over-Voltage Protection, Thermal Shutdown Protection
• Additional features for sink: Programmable Soft-Start
• Additional features for source: Programmable Over-Current Protection, Fast Role Swap support