Power-Switch Family Protects USB Port Against Excess Current and Temperature

Diodes Incorporated has created the AP21xx high-side power-switch range for USB-port applications requiring fast, accurate over-current and over-temperature protection.

Offering designers 0.75A, 1.5A and 2.1A currentlimiting options and a choice of active-high or active-low Enable, the AP21xx optimises port protection for power-providing USB sockets in a range of electronic systems.

These USB power switches provide a cost-effective, industry-standard, small-footprint solution for USB ports. Both single- and dual-channel power switches are available, with all devices optimised for self-powered and bus-powered USB applications.

The power switches include an internal sensing FET that monitors for over-current conditions without increasing series resistance in the current path. An over-temperature sensor is also included. If either over-current or over-temperature conditions are sensed, the device automatically switches into its current-limitingmode. To prevent unwanted tripping when a high capacitive load is connected to the device output, a 7ms de-glitch time-out has also been integrated.

 

FEATURES Fully compliant with all USB standards SOT25, SOP-8L and MSOP-8L-EP packages Operating ambient temperature range: -40°C to 85°C

APPLICATIONS Various USB-port applications 0.75A, 1.5A and 2.1A current-limited USB

 

 

 

• Freescale Semiconductor’s i.MX27, page 090202
• Vishay VBUS053AZ-HAF, page 090205
• ROHM’s BU7331EKN, page 090213

 

Diodes / AP21xx