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SP2525 Datasheet(PDF) 8 Page - Sipex Corporation

Part # SP2525
Description  3.0V to 5.5V USB Power Control Switch
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP2525 Datasheet(HTML) 8 Page - Sipex Corporation

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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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