描述 Description

The uP7550 is a current limited power multiplexer actingas a high side switch for USB applications where heavycapacitive loads and short-circuits are likely to beencountered. It switches output voltage to 5VSB at S3/S4/S5 states with 400mΩ switch and 1A capacity; to 5VCCat S0/S1/S2 states with 80mΩ switch and 1.8A capacity.

This device features an active-high enable control input.Soft start function limits the inrush current from supplyinput when enabled. Disabling the device reduces itsstandby current down to less than 1uA.

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

When the output load exceeds the current-limit thresholdor a short is present, the uP7550 asserts over currentprotection and limits the output current to a safe level bydriving the power switches into saturation mode.

Other features include soft-start to limit inrush currentduring plug-in, thermal shutdown to prevent catastrophicswitch failure from high-current loads, under-voltage lockout(UVLO) to ensure that the device remains off unless thereis a valid input voltage present. The uP7550 is available inSOT23-8L package.

特性 Features

·Compliant to USB Specifications.
·Operating Range: 4.5 V to 5.5 V.
·Output Voltage Switch to 5VSB at S3/S4/S5
·1A Continuous Load Current.
·400mΩ High Side Switch.

·Output Voltage Switch to 5VCC at S0/S1/S2
·1.8A Continuous Load Current.
·80mΩ High Side Switch.

·Low Quiescent Current: 50uA Typical.
·Low Standby Current: Less Than 1uA.
·Slow Turn On and Fast Turn Off.
·Enable Active-High.
·UL Approved: E316940.
·TuV EN60950-1 Certification.
·CB IEC60950-1 Certificatioon.
·RoHS Compliant and Halogen Free.

應(yīng)用 Application

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