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November 2011 Rev. 2.1.0
Exar Corporation www.exar.com
48720 Kato Road, Fremont CA 94538, USA Tel. +1 510 668-7000 – Fax. +1 510 668-7001
GENERAL DESCRIPTION
The SP2525A device is an integrated high-side
power switch ideal for self-powered and bus-
powered Universal Serial Bus (USB)
applications.
The high-side switches are MOSFETs with
70m R
DS(ON)
, which meets USB voltage drop
requirements for maximum transmission wire
length. Multi-purpose open-drain fault flag
output indicates over-current limiting, thermal
shutdown, or under voltage lockout. Output
current is typically limited to 0.85A below the
5A safety requirement, and the thermal
shutdown function shuts the switch off to
prevent damage under overcurrent conditions.
Guaranteed minimum output rise time limits
inrush current during hot plug-in, minimizing
EMI and preventing the voltage at the
upstream port from dropping excessively.
The SP2525A is offered in a RoHS compliant
“green”/halogen free 8-pin NSOIC package.
APPLICATIONS
Self Powered USB 2.0 and 3.0 Hubs
USB Compliant V
BUS
Power Distribution
Audio-Video Equipments
Generic Power Switching
FEATURES
+3.0V to +5.5V Input Voltage Range
500mA Continuous Load Current
per Channel
2.6V Undervoltage Lockout
1.25A Short Circuit Current Limit
100mΩ Maximum On-Resistance
75μA On-State Supply Current
1μA Shutdown Current
Output can be Forced Higher than
Input (Off-State)
Thermal Shutdown
Slow Turn On and Fast Turn Off
Active-high Version: SP2525A-1
Active-low Version: SP2525A-2
RoHS Compliant, Green/Halogen Free
8-Pin NSOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: SP2525A Application Diagram – Single Port Self Powered Hub
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© 2011 Exar Corporation 2/10 Rev. 2.1.0
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
Supply Voltage V
IN
................................................. 7.0V
Fault Flag Voltage V
FLG
............................................ 7.0V
Fault Flag Current I
FLG
........................................... 50mA
Enable Input V
EN
......................................... -0.3V to 15V
Storage Temperature .............................. -65°C to 150°C
Power Dissipation (NSOIC-8) .........................................
(derate 6.14mW/°C above 70°C) ...................... 500mW
OPERATING RATINGS
Ambient Temperature Range ..................... -40°C to 85°C
ELECTRICAL SPECIFICATIONS
Specifications with standard type are for an Operating Ambient Temperature of T
A
= 25°C only; limits applying over the full
Operating Junction Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at T
A
= 25°C, and are provided
for reference purposes only. Unless otherwise indicated, V
IN
= 5.0V, T
A
= 25°C.
Parameter Min. Typ. Max. Units Conditions
Supply Current 0.75 5.0 µA V
EN
= Logic “0” OUT =open
75 100 V
EN
= Logic “1” OUT =open
Enable Input Voltage 0.8 1.7 V V
EN
= Logic “0”
2.0 2.4 V
EN
= Logic “1”
Enable Input Current 0.01 1 µA V
EN
= Logic “0”
0.01 1 V
EN
= Logic “1”
Enable Input Capacitance 1 pF
Output MOSFET Resistance 70 100 m
Output turn-on delay 100 µs
R
L
=10, each output
Output turn-on rise time 1000 4000 µs R
L
=10, each output
Output turn-off delay 0.8 20 µs
R
L
=10, each output
Output turn-off fall time 0.7 20 µs
R
L
=10, each output
Output Leakage Current 10 µA
Current limit threshold 0.6 1.0 1.25 A
Over temperature shutdown
threshold
135 °C
Temperature T
J
raising
125
Temperature T
J
decreasing
Error Flag Output Resistance 10 25 V
IN
=5V, I
L
=10mA
15 40 V
IN
=3.3V, I
L
=10mA
Error Flag Current 0.01 1 µA
UVLO threshold 2.6 V V
IN
increasing
2.4 V
IN
decreasing
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© 2011 Exar Corporation 3/10 Rev. 2.1.0
BLOCK DIAGRAM
Fig. 2: SP2525A Block Diagram
PIN ASSIGNMENT
Fig. 3: SP2525A Pin Assignment
PIN DESCRIPTION
Name Pin Number Description
EN 1 Enable Input Active High for SP2525A-1 and Active Low for SP2525A-2
FLG 2
An active-low and open-drained fault flag output for power switch. It can indicate
current limit if CTL is active. In normal mode operation, it also can indicate
thermal shutdown or under voltage
GND 3 Chip Power Ground
NC 4 Not Internally Connected
IN 5, 7 Power Supply Input
OUT 6, 8 MOSFET Switch Output
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© 2011 Exar Corporation 4/10 Rev. 2.1.0
ORDERING INFORMATION
Part Number Temperature
Range Marking Package Packing
Quantity Note 1 Note 2
SP2525A-1EN-L -40°CT
A
+85°C Sipex
2525A-1E
YYWWL
NSOIC8
Bulk RoHS Compliant
Halogen Free
Enable
Active high
SP2525A-1EN-L/TR -40°CT
A
+85°C 2.5K/Tape & Reel
SP2525A-2EN-L -40°CT
A
+85°C Sipex
2525A-2E
YYWWL
NSOIC8
Bulk RoHS Compliant
Halogen Free
Enable Active
Low
SP2525A-2EN-L/TR -40°CT
A
+85°C 2.5K/Tape & Reel
“YY” = Year – “WW” = Work Week – “X” = Lot Number
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© 2011 Exar Corporation 5/10 Rev. 2.1.0
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at V
IN
= 5.0V, T
A
= 25°C, unless otherwise specified - Schematic and BOM from Application Information
section of this datasheet.
Fig. 4: Output On-Resistance vs Supply Voltage
Fig. 5: Output On-Resistance vs Temperature
Fig. 6: UVLO Threshold vs Temperature
Fig. 7: On-state Supply Current vs Supply Voltage
Fig. 8: On-state Supply Current vs Temperature
Fig. 9: Off-state Supply Current vs Supply Voltage
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© 2011 Exar Corporation 6/10 Rev. 2.1.0
Fig. 10: CTL Threshold vs Supply Voltage
Fig. 11: Current Limit Threshold vs Temperature
Fig. 12: Output Rise Time vs Temperature
Fig. 13: Output Fall Time vs Temperature
Fig. 14: Input Voltage Response
Fig. 15: Turn-On, Turn-Off Characteristics
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© 2011 Exar Corporation 7/10 Rev. 2.1.0
Fig. 16: Turn-On, Turn-Off Characteristics
Fig. 17: Turn-On, Turn-Off Characteristics
Fig. 18: Short Circuit Response
(Short applied to Output)
Fig. 19: Short Circuit Response
(Enable to Short Circuit)
Fig. 20: Short Circuit Transient Response
(Short applied to Output)
Fig. 21: Current Limit Response
(Ramped Load)
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© 2011 Exar Corporation 8/10 Rev. 2.1.0
APPLICATION INFORMATION
ERROR FLAG
The Error Flag is an open-drained output of an
N-channel MOSFET, the FLG output is pulled
low to signal the following fault conditions:
input undervoltage, output current limit, and
thermal shutdown.
CURRENT LIMIT
The current limit threshold is preset internally.
It protects the output MOSFET switches from
damage resulting from undesirable short
circuit conditions or excess inrush current,
which is often encountered during hot plug-in.
The low limit of the current limit threshold of
the SP2525A allows a minimum current of
0.5A through the MOSFET switches. A current
limit condition will signal the Error Flag.
THERMAL SHUTDOWN
When the temperature of the SP2525A
exceeds 135ºC for any reasons, the thermal
shutdown function turns off the MOSFET
switch and signals the Error Flag. A hysteresis
of 10ºC prevents the MOSFETs from turning
back on until the chip temperature drops
below 125ºC.
SUPPLY FILTERING
A 0.1F to 1F bypass capacitor from IN to
GND, located near the device, is strongly
recommended to control supply transients.
Without a bypass capacitor, an output short
may cause ringing on the input (from supply
lead inductance) which can damage internal
control circuitry.
TRANSIENT REQUIREMENTS
USB supports dynamic attachment (hot
plugin) of peripherals. A current surge is
caused by the input capacitance of a
downstream device. Ferrite beads are
recommended in series with all power and
ground connector pins. Ferrite beads reduce
EMI and limit the inrush current during hot-
attachment by filtering high-frequency signals.
SHORT CIRCUIT TRANSIENT
Bulk capacitance provides the short-term
transient current needed during a hot-
attachment event. A 33F/16V tantalum or a
100F/ 10V electrolytic capacitor mounted
close to the downstream connector at each
port should provide sufficient transient drop
protection.
PRINTED CIRCUIT LAYOUT
The Power circuitry of USB printed circuit
boards requires a customized layout to
maximize thermal dissipation and to minimize
voltage drop and EMI.
INPUT AND OUTPUT
The independent solid state switch connects
the IN pin to the OUT pin when enabled by a
logic signal at EN. The IN pin is the power
supply connection to the internal circuitry and
the drain of the output MOSFET. The OUT pin
is the source for the MOSFET. Typically, the
current in USB application will flow through
the switch from IN to OUT towards the load. If
VOUT is greater than VIN when a switch is
enabled, the current will flow from OUT to the
IN pin because the MOSFET channels are
bidirectional when switched on. The output
source is allowed to be externally forced to a
higher voltage than its input without causing
unwanted current flow when the output is
disabled.
TEST CIRCUIT
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© 2011 Exar Corporation 9/10 Rev. 2.1.0
PACKAGE SPECIFICATION
8-PIN NSOIC
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© 2011 Exar Corporation 10/10 Rev. 2.1.0
REVISION HISTORY
Revision Date Description
2.0.0 11/10/2010 Reformat of datasheet
2.1.1 11/04/2011 Updated package specification
FOR FURTHER ASSISTANCE
Email: customersupport@exar.com
Exar Technical Documentation: http://www.exar.com/TechDoc/default.aspx?
E
XAR CORPORATION
HEADQUARTERS AND SALES OFFICES
48720 Kato Road
Fremont, CA 94538 – USA
Tel.: +1 (510) 668-7000
Fax: +1 (510) 668-7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve
design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,
conveys no license under any patent or other right, and makes no representation that the circuits are free of patent
infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a
user’s specific application. While the information in this publication has been carefully checked; no responsibility, however,
is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its
safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in
writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all
such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
