Alpha and Omega Semiconductor Introduces Protected Smart Load Switch for USB Type-C Applications

Industry-leading performance, up to 28 V over-voltage protection, current limiting and true reverse blocking

Alpha and Omega Semiconductor (AOS) introduced a new Type-C Power Delivery compliant load switch with up to 28 V over-voltage protection. AOZ1353 is a current-limited load switch with reverse current blocking capability intended for applications where internal circuitry requires protection from exposure to high voltages. This new device offers low R_DS(ON) (40 mOhm) in a thermally enhanced 3×3 mm DFN package, making it an ideal solution for the latest notebooks, ultrabooks, desktops, monitors, dockings/dongles, and Thunderbolt/USB Type-C PD applications.

The new AOZ1353 operates from voltages between 3.4 V and 5.5 V from V_IN and V_OUT is rated at 28 V Absolute Maximum. The internal current limiting circuit protects the supply from large load currents. The back-to-back switch configuration blocks any leakage between V_IN and V_OUT pins when the device is disabled or when the device is enabled, but V_OUT is greater than V_IN. The AOZ1353 is fully programmable with comprehensive protection features including soft start, short-circuit protection, thermal protection, over-current and over-voltage protection.

Functional Block Diagram.

Technical Highlights

	AOZ1353DI	Major Competitor
Max Operating Voltage	3.4 V to 5.5 V	4 V to 5.5 V
Quiescent Current	80 µA	>1500 µA
Shutdown Current	1 µA	7 µA
Max Load Current	3.5 A	3 A
Programmable Soft Start	Adjustable	Fixed

Pricing and Availability

The AOZ1353 is immediately available in production quantities with a lead-time of 12 weeks. The unit price of 1,000 pieces is $1.5.