1
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
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
SP2525A
DESCRIPTION
The SP2525A device is an integrated high-side power switch for self-powered ideal for self-
powered and bus-powered Universal Serial Bus (USB) applications. The high-side switches
are MOSFET with 70mΩ RDS(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 undervoltage lockout for each channel. Output current
is typically limited to 0.85A below the 5A safety requirement, and the thermal shutdown
functions shuts the switch off to prevent damage under overcurrent condition. Guaranteed
minimum output rise time limits inrush current during hot plug-in, minimizing EMI and
preventing the voltage at upstream port from dropping excessively.
USB High-Side Power Switch
®
APPLICATIONS
■ USB Power Management
■ Hot Plug-In Power Supplies
■ Battery Charger Circuit
Now Available in Lead Free Packaging
■ Active-High Version: SP2525A-1
■ Active-Low Version: SP2525A-2
TYPICAL APPLICATION CIRCUIT
One Port Self Powered Hub
1
2
3
45
6
7
8
SP2525A
8 Pin NSIOC
OUT
IN
OUT
GND
EN
FLG
NC
IN
DATA
GND
D-
D+
VBUS IN OUT
GND
10µF
Cout
10K
+ 1µF
Cin
VIN ON/OFF
OVERCURRENT
GND
SP2525A
EN
FLG
GND
NC
OUT
IN
OUT
IN
33µF
Ferrite Bead
Ferrite Bead
0.01 µF
DATA
VBUS
D+
D-
GND
VCC
5.0V
0.01 µF
SPX1521
®
®
USB CONTROLLER
+
+
33µF
4.50V TO 5.25V
UPSTREAM VBUS
100mA MAX
33µF, 16V Tantalum, or
100µF, 10V Electrolytic
Bold line indicate high-current traces
Preliminary
2
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
Supply Voltage(VIN)..........................................7.0V
Fault Flag Voltage (VFLG)..................................7.0V
Fault Flag Current (IFLG)..................................50mA
Unless otherwise noted, the following specifications apply for VIN = +5.0V, TA = 25°C.
Enable Input (VEN).....................................-0.3V - 15V
Operating Temperature Range.............-40˚C to +85˚C
Storage Temperature Range..............-65˚C to +150˚C
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.
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
Power Dissipation Per Package
8-pin NSOIC (derate 6.14mW/OC above +70OC).......500mW
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3
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
TEST CIRCUIT
PIN DESCRIPTION
OUT
SP2525A
IN
10Ω
VCC
OUT
IN
EN
FLG
GND
10K
0.1µF
+5V
NC
ON
OFF
rebmuNniPemaNniPnoitpircseD
1NE .2-A5252PSrofwoLevitcAdna1-A5252PSrofhgiHevitcAtupnIelbanE
2GLF nactI.hctiwsrewoproftuptuogalftluafdeniard-nepodnawol-evitcanA
nacoslati,noitarepoedomlamronnI.evitcasiLTCfitimiltnerrucetacidni
.egatlovrednuronwodtuhslamrehtetacidni
3DNG.dnuorgrewoppihC
4CN.detcennocyllanretnitoN
7,5NI.tupniylppusrewoP
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4
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
Error Flag
An 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 temperature of 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 0.1µF to 1µF bypass capacitor from IN to
GND, located near the device, is strongly rec-
ommended to control supply transients. With-
out a bypass capacitor, an output short may
cause sufficient ringing on the input (from
supply lead inductance) to damage internal
control circuitry.
APPLICATION INFORMATION
Transient Requirements
USB supports dynamic attachment (hot plug-in)
of peripherals. A current surge is caused by the
input capacitance of 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 tran-
sient current needed during a hot-attachment event.
A 33 µF/16V tantalum or a 100µF/10V electro-
lytic capacitor mounted close to downstream con-
nector each port should provide transient drop
protection
Printed Circuit Layout
The Power circuitry of USB printed circuit boards
requires a customized layout to maximize ther-
mal dissipation and to minimize voltage drop and
EMI.
5
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
BLOCK DIAGRAM
Current
Limit
CS
OUT
Charge
Pump
UVLO
Thermal
Shutdown
Driver
FLG
EN
IN
Power N-MOSFET
GND
6
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
Figure 4. On-state Supply Current vs. Supply Voltage
Figure 1. Output On-Resistance vs. Supply Voltage Figure 2. Output On-Resistance vs. Temperature
Figure 3. UVLO Threshold Voltage vs. Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
UVLO Threshold Voltage vs. Temperature
2.2
2.3
2.4
2.5
2.6
2.7
2.8
-40 -20 0 20 40 60 80 100 120
Temperature (ºC)
UVLO Threshold Voltage (V)
Rising
Falling
ON-State Supply Current vs. Supply Voltage
50
60
70
80
90
100
2345678
Supply Voltage (V)
Switch-ON Supply Current (µA)
Output On-Resistance vs. Supply Voltage
64
65
66
67
68
69
70
234567
Supply Voltage (V)
Switch-ON Resistance (mΩ)
On-Resistance vs. Temperature
50
60
70
80
90
-60 -40 -20 0 20 40 60 80 100 120
Temperature (°C)
ON Resistance (mΩ)
7
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
Figure 6. Off-state Supply Current vs. Supply Voltage
Figure 5. On-state Supply Current vs. Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
Figure 7. Control Threshold vs. Supply Voltage
ON-State Supply Current vs. Supply Voltage
50
60
70
80
90
100
2345678
Supply Voltage (V)
Switch-ON Supply Current (µA)
CTL Threshold Voltage vs. Supply Voltage
0.80
1.00
1.20
1.40
1.60
1.80
2.00
2.20
2.40
2.60
2.80
234567
Supply Voltage (V)
Threshold Voltage (V)
CTL Rising
C
TL Falling
OFF State Supply Current vs. Supply Voltage
0.00
0.02
0.04
0.06
0.08
0.10
345678
Supply Voltage (V)
Supply Current (µA)
Figure 8. Current Limit Threshold vs. Temperature
Current Limit Threshold vs. Temperature
0.75
0.80
0.85
0.90
0.95
1.00
1.05
1.10
1.15
-60 -40 -20 0 20 40 60 80 100 120 140
Temperature (°C)
Output Threshold (A)
8
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
Figure 9. Output Rise Time vs. Temperature
Output Fall Time vs. Temperature
0.38
0.40
0.42
0.44
0.46
0.48
0.50
0.52
0.54
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Turn-off Fall Time (µS)
Output Rise Time vs. Temperature
1.05
1.10
1.15
1.20
1.25
1.30
1.35
1.40
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Turn-ON Resistance (mS)
Figure 7. Output Fall Time vs. Temperature
9
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
PACKAGE: 8 Pin NSOIC
AA1
A2
SIDE VIEW
Seating Plane
SECTION B-B
WITH PLATING
SYMBOL MIN NOM MAX
A 1.35 - 1.75
A1 0.1 - 0.25
A2 1.25 - 1.65
b 0.31 - 0.51
c 0.17 - 0.24
D
E
E1
e
L 0.4 - 1.27
L1
L2
ø0º-8º
ø1 5º - 15º
Note: Dimensions in (mm)
8 Pin NSOIC JEDEC MO-012 (AA) Variation
4.90 BSC
6.00 BSC
3.90 BSC
1.27 BSC
1.04 REF
0.25 BSC
Gauge Plane
L1
L
Ø
Ø1
Ø
Seating Plane
L2
VIEW C
TOP VIEW
b
SEE VIEW C
B
B
E
E/2
E1
INDEX AREA
(D/2 X E1/2)
E1/2
D
1
e
c
BASE METAL
b
10
Date: 12/22/04 SP2525A USB High-Side Power Switch © Copyright 2004 Sipex Corporation
Part Number Temperature Range Package Types
SP2525A-1EN ................................................. -40°C to +85°C ................................................... 8-pin NSOIC
SP2525A-1EN/TR ........................................... -40°C to +85°C.................................................. 8-pin NSOIC
SP2525A-2EN ................................................. -40°C to +85°C ................................................... 8-pin NSOIC
SP2525A-2EN/TR ........................................... -40°C to +85°C.................................................. 8-pin NSOIC
ORDERING INFORMATION
Corporation
ANALOG 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
Sales Office
233 South Hillview Drive
Milpitas, CA 95035
TEL: (408) 934-7500
FAX: (408) 935-7600
Available in lead free packaging. To order add “-L” suffix to part number.
Example: SP2525A-1N/TR = standard; SP2525A-1N-L/TR = lead free
/TR = Tape and Reel
Pack quantity is 2,000 for NSOIC.
CLICK HERE TO ORDER SAMPLES
