The uP7537 is a current limited, dual-input triple-output power multiplexer acting as a high side switch for USB applications where heavy capacitive loads and short-circuits are likely to be encountered. It switches output voltages to 5VSB at S3/S4/S5 states with typical 400mΩ switches and 200mA capacity; to 5VCC at S0/S1/S2 states with typical 80mΩ switches and 1.2A capacity. The outputs can be parallelled to provide totally 3.0A output current at S0/ S1/S2 states.

Optimal switch logic according to S3# and 5VCC status ensures seamless output voltage transition.

When the output load exceeds the current-limit threshold or a short is present, the uP7537 asserts over current protection and limits the output current to a safe level by driving the power switches into saturation mode.

Other features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic switch failure from high-current loads, under-voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present. The uP7537 is available in PSOP-8L package.

• Notebook and Desktop PCs.
• USB Power Management.
• ACPI Power Distribution.
• Hot-Plug Power Supplies.