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SP2525 Datasheet(PDF) 8 Page - Sipex Corporation |
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SP2525 Datasheet(HTML) 8 Page - Sipex Corporation |
8 / 16 page 8 Rev. 8/21/01 SP2525 +3.0 to +5.5 Power Control Switch © Copyright 2001 Sipex Corporation Soft Start Condition The soft start feature of the SP2525 is imple- mented by holding the output turn-on rise time to 1ms. When off, the device has high imped- ance MOSFET channels that slowly become low impedance as the device powers on. This prevents an inrush current from causing voltage drops that result from charging a capacitive load and can pull the USB voltage bus below specified levels. This satisfies the USB voltage droop requirements for bus-powered applica- tions. The SP2525 can provide inrush current limiting for applications with large load capacitances where C BULK > 10µF. Refer to the circuit in Figure 7 for a configuration that will meet USB transient regulation specifications with large load capacitances. Enable Input The ENA and ENB control pins must be driven to a logic high or logic low for a clearly defined signal input. Floating these control lines may cause unpredictable operation. USB Compliance The SP2525 is ideal for self-powered and bus- powered Universal Serial Bus (USB) applica- tions. A USB port provides a +5.0V bus and ground return line in addition to a twisted pair for data. The SP2525 will comply with the following USB requirements: 1) The fault current is well below the UL 25VA safety requirements; 2) The Flag Outputs are available to indicate fault conditions to USB controllers; 3) The MOSFET switches' low on-resistance meets USB voltage drop requirements; 4) Each MOSFET switch channel can supply 500mA as required by USB downstream de- vices; 5) Soft start eliminates any momentary voltage drops on the upstream port that may occur when the switches are enabled in bus-powered applica- tions. Refer to Table 1 for a USB compliance summary of the SP2525. Additional features include the following: 6) An Undervoltage Lockout ensures that the device remains off unless there is a valid input supply voltage present; 7) +3.3V and +5.0V logic compatible enable inputs; 8) Thermal Shutdown prevents the possibility of catastrophic switch failure from high-current loads; 8) The device is available in both active-high and active-low versions. Refer to Figures 8 to 23 for typical performance characteristics of the SP2525. |
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Similar Description - SP2525 |
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