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Motore di ricerca datesheet componenti elettronici |
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CM3513 Scheda tecnica(PDF) 1 Page - California Micro Devices Corp |
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CM3513 Scheda tecnica(HTML) 1 Page - California Micro Devices Corp |
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1 / 10 page  CALIFORNIA MICRO DEVICES Preliminary CM3513 © 2003 California Micro Devices Corp. All rights reserved. C0970500 11/10/03 430 N. McCarthy Blvd, Milpitas, California 95035 Tel: (408) 263-3214 Fax: (408) 263-7846 www.calmicro.com 1 USB 2.4A Overcurrent Switch Features • High-side high current switch with active low Enable • Up to 2.4A continuous current on the output • Over-current limits at 2.4A min • 10msec min fault blanking delay on OC# output prevents false overcurrent alarms • Prevents backdrive current when host powered off • Low operating current (95 µA typ.) • Low quiescent current when disabled (<1 µA max) • Small 8-Lead SOIC package Applications • Desktop PCs, Notebooks and Set-Top-Boxes Pin Diagram Product Description California Micro Devices’ CM3513 is a USB overcurrent power switch that provides power to four USB ports. The device has a power switch that provides the VBUS voltage at the USB output ports with minimal voltage drop. When the EN# pin is logic low, the power switch is ON, and VCC is connected to the output VOUT. When the EN# pin is logic high, the power switch is OFF, and no power is available at the output. The power switch has full over-current protection. Whenever the current limit of the switch is exceeded, the device enters a constant-current mode, where the output voltage is progressively reduced to prevent the current from increasing further. The OC# output becomes active low only if the overcurrent condition exceeds at least 10ms. This fault blanking delay prevents false alarms from being reported to the host USB controller. If the overcurrent condition is severe enough that the part heats up to the thermal limit TMAX, then the switch will be turned off and the temperature cools down. At TMIN the switch then turns on again, and the device heats up again, and so on, until the fault is removed. The CM3513 also prevents backdrive current flowing into the host from the connected peripheral. This can occur when VCC is removed as the host powers down, and the peripheral still has normal power applied. The 5V from the peripheral can therefore be linked to the host’s VBUS, potentially causing backdrive current into the host and overloading the peripheral power supply. Typical Application Circuit Simplified Electrical Schematic VOUT VOUT OC# VOUT VCC EN# GND VCC SOIC-8 TOP 2 USB Ports VBUS VBUS 2 USB Ports VCC EN# GND VCC VOUT VOUT OC# VOUT VCC EN# OC# VOUT VCC Over current protect Charge Pump |
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