描述 Description

The uP7549 is a current limited high-side switch designedfor applications where heavy capacitive loads and shortcircuitsare likely to be met. This device operates withinputs from 2.7V to 5.5V for both 3V and 5V systems. Itslow quiescent current and standby current (<1uA) conservebattery power in portable.

The power switch is controlled by a logic enable input anddriven by an internal charge pump circuit. When the outputload exceeds the current-limit threshold or a short ispresent, the uP7549 asserts over current protection andlimits the output current to a safe level by driving the powerswitch into saturation mode.

The uP7549 features glitch-blank fault flag that is assertedby over current and over temperature. The 8ms glitchblankingtime allows momentary faults to be ignored, thuspreventing false alarms to the host system.

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 uP7549 is available inSOP - 8L , SOT23 - 5L, MSOP - 8L, and PMSOP - 8Lpackages.

特性 Features

·Compliant to USB Specifications.
·Operating Range: 2.7 V to 5.5 V.
·75mΩ (5V Input) High Side MOSFET Switch.
·100uA Typical Quiescent Current.
·<1uA Typical Shutdown Current.
·Over Current/ Short Circuit Protection.
·Thermal Shutdown Protection.
·Deglitched Open Drain Fault Flag.
·Slow Turn On and Fast Turn Off.
·Enable Active-High or Active-Low.
·Pb-Free (RoHS Compliant).
·UL Approved-E316940.
·TuV EN60950-1 Certification.
·CB IEC60950-1 Certification.

應(yīng)用 Application

·Notebook and Desktop PCs.
·USB Power Management.
·ACPI Power Distribution.
·Hot-Plug Power Supplies.
·Battery-Powered Equipments.
·Battery-Charger Circuits.