Type-C Power Delivery switch protects with reverse current blocking

An industry leading performance is claimed for the AOZ1374 high voltage source switch by Alpha and Omega Semiconductor. The smart protection switch provides up to 28V absolute maximum voltage and true reverse current blocking for Type-C Power Delivery (PD) port applications.

The AOZ1374 smart protection switch is supplied in a small thermally enhanced 3.0 x 3.0mm DFN package.

The IC supports protection features such as true reverse blocking in the small footprint and, Alpha and Omega claims, has an industry-leading on-resistance of 36 mOhm for back to back MOSFETs.

In consumer and computing equipment, USB ports can receive up to 100W of power, which typically comes from an AC/DC adapter supporting Type-C PD. The host device typically provides (sources) 5.0V at 3.0A or up to 15W. This is the most common implementation in notebook applications and also in the majority of desktops, points out Alpha and Omega, yet Type-C PD ports are gaining popularity in more devices such as smart monitors and power banks. For such applications, a high voltage sourcing switch is required to deliver up to 100W power.

Type C high voltage sourcing switches are also increasingly common in graphics cards or game consoles to power high-end virtual reality gaming goggles. Similarly, a personal computer can connect to a monitor using one single Type-C cable providing both power and data.

The AOZ1374 IC uses a design IP developed for the AOZ1375DI high voltage bi-directional source/sink Type C protection switch. It has added integration features to eliminate the eternal current limiting resistor. The AOZ1374 features 28V absolute maximum voltage with the current limit capability, and start-up safe operating area (SOA) management.

The thinner profile, higher power, and greater flexibility offered by USB Type-C and USB PD 3.0 standards have prompted many to simplify the connectivity between devices down to a single wire for both power and data, explained Peter Cheng, power IC senior marketing director at Alpha and Omega Semiconductor.

“[The] AOZ1374 high voltage capability provides the most compact and simple protection device for charging or powering high-power external devices,” he said.

There are two versions, the AOZ1374DI-01 (auto-restart) and AOZ1374DI-02 (latch-off) after fault release. Both are in a 3.0 x 3.0 DFN-10L package and available immediately in production quantities with a lead-time of 12 weeks.


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