1
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
s
Compliant to USB Specifications
s
+3.0V to +5.5V Input Voltage Range
s
Open Drain Error Flag Output
s
2.7V Undervoltage Lockout
s
500mA Minimum Continuous Load
Current
s
1.25A Short Circuit Current Limit
DESCRIPTION
The SP2525 device is a single +3.0V to +5.5V USB Supervisory Power Control Switch ideal
for self-powered and bus-powered Universal Serial Bus (USB) applications. The SP2525
device has low on-resistance (80m
typical) and can supply 500mA minimum. The fault
currents are limited to 2.0A typical and the flag output pin is available to indicate fault
conditions to the USB controller. The 1ms soft start of the SP2525 device will eliminate any
momentary voltage drop on the upstream port that may occur when the switch is enabled in
bus-powered applications. The thermal shutdown feature will prevent permanent damage to
the SP2525 device when subjected to excessive current loads. The under voltage lockout feature
will ensure that the SP2525 device will remain off unless there is a valid input voltage present.
+3.0V to +5.5V USB Power Control Switch
SP2525
EN
OUT
OUT
FLG
GND
NC
IN
NC
SP2525
8
7
4
3
2
1
5
6
s
140m
Maximum On-Resistance
s
80
A On-State Supply Current
s
1
A Shutdown Current
s
Thermal Shutdown
s
1ms Soft-Start Power Up
s
Active-High Version: SP2525-1
s
Active-Low Version: SP2525-2
2
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
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.......................................-0.3V, +6.0V
Operating Temperature......................-40C to +85C
Storage Temperature.......................-65C to +150C
Power Dissipation Per Package
8-pin NSOIC (derate 6.14mW/
O
C above +70
O
C).......500mW
SPECIFICATIONS
Unless otherwise noted, the following specifications apply for V
IN
= +5.0V and T
AMB
= 25
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3
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
PIN ASSIGNMENTS
Pin Number
Pin Symbol
Description
1
EN
Enable Input Active High for the SP2525-1 and Active
Low for the SP2525-2.
2
FLG
Fault Flag Output --Active-low, open-drain output.
Indicates over-current, UVLO and Thermal Shutdown.
3
GND
Ground Reference --Supply return.
4
NC
No Connection.
5
NC
No Connection.
6, 8
OUT
Switch Output Connect Out Pins Together
7
IN
Supply Voltage (Input)
EN
OUT
OUT
FLG
GND
NC
IN
NC
SP2525
8
7
4
3
2
1
5
6
4
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
FEATURES
The SP2525 device is a single +3.0V to +5.5V
USB Supervisory Power Control Switch ideal
for self-powered and bus-powered Universal
Serial Bus (USB) applications. USB provides
a +5.0V bus and ground return line in addition
to a twisted pair line for data.
Features of the SP2525 device include current
limiting, a +2.7V undervoltage lockout, over-
temperature shutdown, error flag output, soft
start power up, a switch-on resistance of 140m
over the entire supply range, and a supply
current of 80
A. The SP2525-1 device has
active-high inputs. The SP2525-2 device has
active-low inputs.
THEORY OF OPERATION
There are operational conditions that will en-
able or disable one or more of the output
transistors, depending on the type of hazard.
Certain conditions will activate the open-drain
error flag transistors forcing the flag output to
ground. The SP2525 device is a single inte-
grated high-side power switch optimized for
self-powered and bus-powered Universal Se-
rial Bus (USB) applications. The SP2525 de-
vice provides the following functions:
1) Solid State Switch : MOSFET M1 connects
the IN pin to the OUT pins when enabled by a
logic signal at the EN pin.
2) Fault Flag Conditions : The FLG pin is an
N-channel, open-drain MOSFET output ca-
pable of sinking a 10mA load to typically
100mV above ground.
3) Undervoltage Lockout : The lockout mecha-
nism monitors the input voltage and will enable
the MOSFET switch only when the input sig-
nal is >2.7V.
4) Current Limiting Threshold : A current
limiting threshold is set internally to prevent
any damage to the device and external load.
5) Thermal Shutdown : This mechanism pro-
tects the device switch and signals a fault condi-
tion if the die temperature exceeds 135
O
C. This
function has 10
O
C of hysteresis that prevents the
MOSFET switches from turning on until the die
temperature drops to 125
O
C.
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 of the MOSFET.
Typically, the current in USB application will
flow through the switch from IN to OUT towards
the load. If V
OUT
is greater than V
IN
when a switch
is enabled, the current will flow from OUT to the
IN pin because the MOSFET channels are bidi-
rectional when switched on.
Under normal operating conditions, the MOSFET
switch will present 140m
maximum resistance
when closed. The device is designed to allow
out pin to be externally forced to a higher voltage
than the IN pin when the switch is off.
Fault Flag Conditions
The fault flag is an N-channel, open drain
MOSFET output. The active low fault flag is
asserted when one of the following conditions
exist:
1. Undervoltage
2. Soft Start
3. Overcurrent
4. Overtemperature
Undervoltage Lockout
This voltage lockout mechanism prevents the
output MOSFET switches from turning on until
V
IN
is >2.7V.
After the switch turns on, if the voltage at V
IN
drops below +2.5V, the lockout circuitry shuts
off the output MOSFET switch and signals the
FLG fault flag. In the undervoltage lockout
state, the FLG pin will be at a logic low. This
detection functions only when the MOSFET
switch is enabled.
5
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 1. Test Circuit for the SP2525
SP2525
OUT
IN
OUT
EN
FLG
GND
R1
100k
P1
1
2
3
4
EN
AGND
Ferrite Bead
NC
NC
8
7
6
5
AGND
AGND
AGND
AGND
C1
0.1
F
2
1
Ferrite Bead
RL
CL
2
1
IN
6
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 2. Typical Application Circuit for the SP2525
Figure 3. Internal Block Diagram for the SP2525
IN
OUT
FLAG
AGND
EN
AGND
IN
OSCILLATOR
CHARGE
PUMP
FOLDBACK
CURRENT
SENSE
SHUTDOWN
UVLO
OVER-TEMP
OVER
CURRENT
LOGIC
REFERENCE
AND
TEMPERATURE
SENSING
FIGURE 3
SP2525
OUT
IN
OUT
EN
FLG
GND
R1
100k
1
2
3
4
ENABLE
AGND
Ferrite Bead
NC
NC
8
7
6
5
AGND
AGND
AGND
C1
0.1
F
2
1
Ferrite Bead
RL
CL
2
1
IN
FLAG
VBUS
D+
D-
GND
USB
Port
SP5301
Data
Control
USB
Controller
D+
D-
7
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Output Current Limiting
The switch control circuit will implement cur-
rent limiting which prevents damage to the
device and the external load while allowing a
minimum current of 0.5A.
The SP2525 MOSFET switches will exhibit
very low resistance (
100m
) or voltage drop
until the current limit is reached. As the load
resistance decreases further, the current sup-
plied will decrease until it reaches the foldback
current, 500mA minimum. The foldback cur-
rent is the current that is delivered into a short
circuit at the output.
If a MOSFET switch is enabled into a heavy
load or short-circuit, the switch will immedi-
ately go into a constant-current mode, reducing
the output voltage. The fault flag is forced low
until the excessive load is removed.
Thermal Shutdown
Thermal shutdown is asserted if the die tem-
perature exceeds 135
O
C and will not release
until the die temperature drops below 125
O
C.
Thermal shutdown will disable the output
MOSFET switch and force fault flag low.
The delay between flag assertion and thermal
shutdown can vary with ambient temperature,
board layout, and load impedance, but is typi-
cally several hundred milliseconds. The USB
controller, recognizing a fault, can disable the
device within this time, otherwise the device
will thermal cycle. This does not cause damage
to the SP2525.
TYPICAL APPLICATIONS
Bypass Capacitors
Recommended is a 0.1
F to 1.0
F bypass ca-
pacitor from the IN pin to the GND pin to control
power supply transients. Without a bypass
capacitor, an output short may cause sufficient
ringing to damage the internal circuitry.
Input or output transients must not exceed the
absolute maximum supply voltage even for a
short duration without risk of damage to the
device. V
IN(MAX)
= +6.0V.
Soft Start Condition
The soft start feature of the SP2525 device is
implemented by holding the output turn on rise
time to 1ms. When off, the device has high
impedance MOSFET channels that slowly be-
come low impedance as the device powers on.
This prevents an inrush current from causing
voltage drops that result from charging a capaci-
tive load. This satisfies the USB voltage droop
requirements for bus-powered applications.
Enable Input
The EN control pin must be driven to a logic
high or logic low for a clearly defined signal
input. Floating this control line may cause
unpredictable operation.
Transient Overcurrent Filter
When the SP2525 device is enabled, large val-
ues of capacitance at the output of the device
will cause inrush current to exceed the short
circuit current-limit threshold of the device and
assert a flag fault condition. The duration of this
time will depend on the size of the output ca-
pacitance. During the capacitance charging
time, the device enters constant-current mode.
As the capacitance is charged, the current de-
creases below the short circuit current-limit
threshold and the fault flags will be de-asserted.
In USB applications, it is required that output
bulk capacitance is utilized to support hot-plug
occurrences. When the SP2525 device is en-
abled, the flag may go active for about 1ms due
to inrush current exceeding the current-limit.
Additionally, during hot-plug events, inrush cur-
rents may also cause the fault flag to go active
for 1ms. Since these conditions are not valid
overcurrent faults, the USB controller must ig-
nore the fault flags during these events. To
prevent this, a 1ms RC filter maybe useful as
shown in Figure. Alternatively, a 1ms debounce
routine may be programmed into the USB logic
controller, eliminating the need for the RC filter.
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
> 10
F. 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.
9
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 5. An RC Filter for Overcurrent Faults
Figure 4. Bypass Capacitor at the Supply Pins
ENA 1
FLGA 2
FLGB 3
ENB 4
0.1
F to 1.0
F
8 OUTA
7 IN
6 GND
5 OUTB
SP2525
+5.0V
ENA 1
FLGA 2
FLGB 3
ENB 4
USB
Controller
0.1
F
8 OUTA
7 IN
6 GND
5 OUTB
SP2525
OVERCURRENT
10k
10k
+5.0V
ENA 1
FLGA 2
FLGB 3
ENB 4
USB
Controller
USB
Cable
4.7
F
8 OUTA
7 IN
6 GND
5 OUTB
0.1
F
SP2525
C
BULK
USB
Cable
Downstream
USB Device
USB Powered Hub
USB Host
V
BUS
GND
Figure 6. Soft Start Circuit Configuration for a Single Channel USB-powered Application with the SP2526
10
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
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h
c
a
e
r
s
m
1
n
i
n
o
s
n
r
u
T
d
e
r
i
u
q
e
r
y
t
il
i
b
a
p
a
c
g
n
i
t
r
o
p
e
r
t
n
e
r
r
u
c
-
r
e
v
O
s
g
a
l
f
t
l
u
a
f
n
i
a
r
d
n
e
p
O
Figure 7. Soft Start Circuit Configuration for SP2526 Applications with Large Load Capacitances
ENA 1
FLGA 2
FLGB 3
ENB 4
USB
Controller
4.7
F
8 OUTA
7 IN
6 GND
5 OUTB
0.1
F
SP2525-2
C
BULK
USB
Cable
USB Peripheral
USB Host
V
BUS
GND
C
BULK
OUTA
OUTB
GND
GND
PORT A
PORT B
Table 1. USB Protocol Compliance of the SP2525 Device
11
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 8. Output On-Resistance vs. Supply Voltage
Figure 9. Output On-Resistance vs. Temperature
Figure 10. Undervoltage Threshold Voltage vs.
Temperature
Figure 11. Control Threshold vs. Supply Voltage
PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, single MOSFET switch section, and T
AMB
= +25
O
C unless otherwise noted.
Output On-Resistance vs. Temperature
60
70
80
90
100
110
120
-40
-20
0
20
40
60
80
100
Temperature (C)
Vcc=5V
Enable Threshold Voltage vs. Supply Voltage
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
3
3.5
4
4.5
5
Supply Voltage (V)
Enable Voltage Rising
Enable Voltage Falling
Output-On-Resistane (millohms)
On-Resistane (millohms)
Enable Threshold Voltage (V)
Output On-Resistance vs. Supply Voltage
80
84
88
92
96
100
2.5
3
3.5
4
4.5
5
5.5
6
Supply Voltage (V)
UVLO Threshold Voltage
vs. Temperature
2.68
2.7
2.72
2.74
2.76
2.78
2.8
2.82
2.84
2.86
2.88
-40
-20
0
20
40
60
80
100
Temperature (C)
Rising
Falling
UVLO Threshold Voltage (V)
12
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 14. Control Threshold vs. Temperature
Figure 15. Input Voltage Response
Enable Threshold Voltage
vs. Temperature
1.5
1.7
1.9
2.1
2.3
2.5
-40
-20
0
20
40
60
80
100
Temperature (C)
Vcc=5V
Enable Voltage Rising
Enable Voltage Falling
Enable Threshold Voltage (V)
V
IN
V
OUT
I
OUT
FLAG
R
L
=35
C
L
=10
F
200mA/Div
Figure 12. Off-State Supply Current vs. Supply Voltage
Figure 13. Off-State Supply Current vs. Temperature
PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, single MOSFET switch section, and T
AMB
= +25
O
C unless otherwise noted.
Offstate Supply Current
vs. Supply Voltage
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
3
3.5
4
4.5
5
5.5
Supply Voltage (V)
Offstate Supply Current
vs. Temperature
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
-40
-20
0
20
40
60
80
100
Temperature (C)
Vcc=5V
Switches Disabled
Offstate Supply Current (
A)
Offstate Supply Current (
A)
13
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 16. Current-Limit Response with a Ramped
Load
PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, single MOSFET switch section, and T
AMB
= +25
O
C unless otherwise noted.
Figure 17. Turn-on/Turn-off Characteristics where RL
= 35
and CL = 10
F
I
OUT
V
OUT
EN
R
L
=35
C
L
=10
F
FLAG
FLAG
V
OUT
I
OUT
Figure 19. Short Circuit Response (Enable into Short
Circuit)
Figure 18. Turn-on/Turn-off Characteristics where R
L
= 35
and C
L
= 150
F
I
OUT
V
OUT
EN
FLAG
200mA/DIV
R
L
= 350
C
L
= 150
F
I
OUT
V
OUT
EN
FLAG
0.5A/DIV
14
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Figure 22. Short Circuit Response (Enable into Short
Circuit)
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
0
0.5
1
1.5
2
2.5
3
3.5
I
OUT
V
OUT
V
IN
= 5
Figure 23. Current Limit Response (Pulsed Load Applied
at Output)
I
OUT
V
OUT
FLAG
EN
1A/DIV
R
L
= 1
PERFORMANCE CHARACTERISTICS
V
IN
= +5.0V, single MOSFET switch section, and T
AMB
= +25
O
C unless otherwise noted.
Figure 20. Short Circuit Response (Short Applied to
Output)
Figure 21. Short Circuit Response (Short Applied to
Output)
I
OUT
V
OUT
FLAG
1A/DIV
2A/DIV
I
OUT
V
OUT
FLAG
15
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
D
E
H
PACKAGE: PLASTIC
SMALL OUTLINE (SOIC)
(NARROW)
DIMENSIONS (Inches)
Minimum/Maximum
(mm)
8PIN
A
A1
L
B
e
h x 45
A
A1
B
D
E
e
H
h
L
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249
0.014/0.019
(0.35/0.49)
0.189/0.197
(4.80/5.00)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0
/8
(0
/8
)
14PIN
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249)
0.013/0.020
(0.330/0.508)
0.337/0.344
(8.552/8.748)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0
/8
(0
/8
)
16PIN
0.053/0.069
(1.346/1.748)
0.004/0.010
(0.102/0.249)
0.013/0.020
(0.330/0.508)
0.386/0.394
(9.802/10.000)
0.150/0.157
(3.802/3.988)
0.050 BSC
(1.270 BSC)
0.228/0.244
(5.801/6.198)
0.010/0.020
(0.254/0.498)
0.016/0.050
(0.406/1.270)
0
/8
(0
/8
)
16
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch Copyright 2001 Sipex Corporation
Model
Temperature Range
Package Types
SP2525-1EN ................................................... -40
C to +85
C ................................................... 8-pin NSOIC
SP2525-1EN/TR .............................................. -40
C to +85
C ........................... (Tape & Reel) 8-pin NSOIC
SP2525-2EN ................................................... -40
C to +85
C ................................................... 8-pin NSOIC
SP2525-2EN/TR .............................................. -40
C to +85
C ........................... (Tape & Reel) 8-pin NSOIC
ORDERING INFORMATION
Corporation
SIGNAL PROCESSING EXCELLENCE
Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the
application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.
Sipex Corporation
Headquarters and Main Offices:
22 Linnell Circle
Billerica, MA 01821
TEL: (978) 667-8700
FAX: (978) 670-9001
e-mail: sales@sipex.com
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 935-7600
FAX: (408) 934-7500
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