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(R)
SP2525
+3.0V to +5.5V USB Power Control Switch
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 s 140m Maximum On-Resistance s 80A On-State Supply Current s 1A Shutdown Current s Thermal Shutdown s 1ms Soft-Start Power Up s Active-High Version: SP2525-1 s Active-Low Version: SP2525-2
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.
EN FLG GND NC
1 2 3 4 SP2525
8 7 6 5
OUT IN OUT NC
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
1
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/OC above +70OC).......500mW
SPECIFICATIONS
Unless otherwise noted, the following specifications apply for VIN = +5.0V and TAMB = 25OC.
PARAMETER Operating Voltage Range, VIN Supply Current, IIN Enable Input Threshold Voltage
MIN. 3.0
TYP.
MAX. 5.5
UNITS V A V A pF
CONDITIONS
0.05 80 0.8 2.1 1.9 0.01 0.01 1 80 0.5 1 1 1 .02 2.0 0.5 0.75 135 125 10 15 0.01 2.5 2.7 2.6
5.0 140 2.4 1 1
enable off, no output load enable on, no output load low to high transition high to low transition VEN=VOH(min)=2.4V VEN=VOL(max)=0.8V
Enable Input Current Enable Input Capacitance Switch Resistance Output Turn-On Delay Output Turn-On Rise Time Output Turn-Off Delay Output Turn-Off Fall Time Output Leakage Current Current Limit Threshold Short Circuit Current Limit Over-Temperature Shutdown Threshold Error Flag Output Resistance Error Flag Off Current UVLO Threshold
140
m ms ms
3.0V20 20 10 2.8 1.25
s s A A A
O
Ramped load applied VOUT = 0V increasing temperature decreasing temperature VIN=5V,IL=10mA VIN=3.3V,IL=10mA VFLAG=5V VIN increasing, TMIN to TMAX VIN decreasing TMIN to TMAX
C
25 40 1 3.0
A V
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
2
EN FLG GND NC
1 2 3 4 SP2525
8 7 6 5
OUT IN OUT NC
PIN ASSIGNMENTS
Pin Number 1 Pin Symbol EN Description Enable Input Active High for the SP2525-1 and Active Low for the SP2525-2. Fault Flag Output --Active-low, open-drain output. Indicates over-current, UVLO and Thermal Shutdown. Ground Reference --Supply return. No Connection. No Connection. Switch Output Connect Out Pins Together Supply Voltage (Input)
2
FLG
3 4 5 6, 8 7
GND NC NC OUT IN
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
3
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, overtemperature shutdown, error flag output, soft start power up, a switch-on resistance of 140m over the entire supply range, and a supply current of 80A. 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 enable 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 integrated high-side power switch optimized for self-powered and bus-powered Universal Serial Bus (USB) applications. The SP2525 device 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 capable of sinking a 10mA load to typically 100mV above ground. 3) Undervoltage Lockout : The lockout mechanism monitors the input voltage and will enable the MOSFET switch only when the input signal 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 protects the device switch and signals a fault condition if the die temperature exceeds 135OC. This function has 10OC of hysteresis that prevents the MOSFET switches from turning on until the die temperature drops to 125OC. 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 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. 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. 2. 3. 4. Undervoltage Soft Start Overcurrent Overtemperature
Undervoltage Lockout This voltage lockout mechanism prevents the output MOSFET switches from turning on until VIN is >2.7V. After the switch turns on, if the voltage at VIN 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.
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
4
IN
2 R1 100k P1 1
C1 0.1F
AGND EN
1 EN 2 3 4
OUT 8
Ferrite Bead
SP2525
FLG GND NC
IN 7
OUT 6 NC 5
2 1
CL Ferrite Bead
RL
AGND
AGND
AGND
AGND
Figure 1. Test Circuit for the SP2525
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
5
IN
2 R1 100k 1
C1 0.1F
AGND ENABLE FLAG
1 EN 2 3 4
OUT 8
Ferrite Bead RL CL Ferrite Bead
FLG
SP2525 IN
7
VBUS D+ DGND
USB Controller
GND NC
OUT 6 NC 5
2 1
USB Port
AGND Data SP5301
D+ D-
AGND
AGND
Control
Figure 2. Typical Application Circuit for the SP2525
IN CHARGE PUMP
OSCILLATOR
FOLDBACK
CURRENT SENSE SHUTDOWN OUT EN
IN
UVLO OVER CURRENT OVER-TEMP REFERENCE AND TEMPERATURE SENSING LOGIC FLAG
AGND
FIGURE 3
AGND
Figure 3. Internal Block Diagram for the SP2525
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
6
Output Current Limiting The switch control circuit will implement current 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 supplied will decrease until it reaches the foldback current, 500mA minimum. The foldback current 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 immediately 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 temperature exceeds 135OC and will not release until the die temperature drops below 125OC. 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 typically 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 0.1F to 1.0F bypass capacitor 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. VIN(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 become low impedance as the device powers on. This prevents an inrush current from causing voltage drops that result from charging a capacitive 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 values 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 capacitance. During the capacitance charging time, the device enters constant-current mode. As the capacitance is charged, the current decreases 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 enabled, the flag may go active for about 1ms due to inrush current exceeding the current-limit. Additionally, during hot-plug events, inrush currents may also cause the fault flag to go active for 1ms. Since these conditions are not valid overcurrent faults, the USB controller must ignore 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.
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
7
Soft Start Condition The soft start feature of the SP2525 is implemented by holding the output turn-on rise time to 1ms. When off, the device has high impedance 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 applications. The SP2525 can provide inrush current limiting for applications with large load capacitances where CBULK > 10F. 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 buspowered Universal Serial Bus (USB) applications. 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 devices;
5) Soft start eliminates any momentary voltage drops on the upstream port that may occur when the switches are enabled in bus-powered applications. 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.
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
8
USB Controller
+5.0V
OVERCURRENT
SP2525
ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB 0.1F to 1.0F
+5.0V
10k 10k ENA FLGA FLGB ENB 1 2 3 4
SP2525
8 OUTA 7 IN 6 GND 5 OUTB
0.1F
Figure 4. Bypass Capacitor at the Supply Pins
Figure 5. An RC Filter for Overcurrent Faults
USB Controller
USB Powered Hub
USB Cable VBUS USB Host GND
4.7F
SP2525
ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB 0.1F CBULK
USB Cable
Downstream USB Device
Figure 6. Soft Start Circuit Configuration for a Single Channel USB-powered Application with the SP2526
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
9
USB Controller
USB Peripheral OUTA PORT A GND
USB Cable VBUS USB Host GND
4.7F
SP2525-2
ENA FLGA FLGB ENB 1 2 3 4 8 OUTA 7 IN 6 GND 5 OUTB 0.1F CBULK
GND PORT B OUTB
CBULK
Figure 7. Soft Start Circuit Configuration for SP2526 Applications with Large Load Capacitances
USB Requirement Inrush current limiting required Suspend State of <500A Required Bus powered hubs must have 350mV maximum drop from cable plug to port Voltage supplied to host or hub port is +4.75V to +5.25V A device that draws bus power must have a stable supply within 100ms of VBUS reaching +4.4V Over-current reporting capability required
Table 1. USB Protocol Compliance of the SP2525 Device
SP2525 Compliant Feature Soft start turns on in 1ms Suspend Current of 1A maximum Switch on resistance of 140m maximum (translates to 70mV at 500mA) Operating range of +3.0V to +5.5V Turns on in 1ms Open drain fault flags
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
10
PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
Output On-Resistance vs. Temperature
100
Output On-Resistance vs. Supply Voltage
120
Output-On-Resistane (millohms)
On-Resistane (millohms)
110
96
Vcc=5V
100
92
90
88
80
84
70
80 2.5
60
3
3.5
4
4.5
5
5.5
6
-40
-20
0
20
40
60
80
100
Supply Voltage (V)
Temperature (C)
Figure 8. Output On-Resistance vs. Supply Voltage
Figure 9. Output On-Resistance vs. Temperature
UVLO Threshold Voltage vs. Temperature
2.88
2.3
Enable Threshold Voltage vs. Supply Voltage
2.86
Enable Threshold Voltage (V)
2.1
UVLO Threshold Voltage (V)
2.84
Rising
1.9
Enable Voltage Rising
2.82
2.8
1.7
2.78
1.5
Enable Voltage Falling
2.76
2.74
1.3
2.72
Falling
1.1
2.7
0.9
2.68
2.5
-20 0 20 40 60 80 100 Temperature (C)
3
3.5
4
4.5
5
-40
Supply Voltage (V)
Figure 10. Undervoltage Threshold Voltage vs. Temperature
Figure 11. Control Threshold vs. Supply Voltage
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
11
PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
Offstate Supply Current vs. Supply Voltage
1.8
Offstate Supply Current vs. Temperature
5.0
1.6
4.5
Offstate Supply Current (A)
Offstate Supply Current (A)
1.4
4.0
3.5
1.2
Vcc=5V Switches Disabled
3.0
1.0
2.5
0.8
2.0
0.6
1.5
0.4
1.0
0.2
0.5
0.0
0.0
3
3.5
4
4.5
5
5.5
-40
-20
0
20
40
60
80
100
Supply Voltage (V)
Temperature (C)
Figure 12. Off-State Supply Current vs. Supply Voltage
Figure 13. Off-State Supply Current vs. Temperature
Enable Threshold Voltage vs. Temperature
2.5
Enable Threshold Voltage (V)
Enable Voltage Rising
2.3
Vcc=5V
VIN RL=35 CL=10F
2.1
VOUT
1.9
FLAG
Enable Voltage Falling
1.7
IOUT
200mA/Div
1.5
-40
-20
0
20
40
60
80
100
Temperature (C)
Figure 14. Control Threshold vs. Temperature
Figure 15. Input Voltage Response
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
12
PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
FLAG
EN FLAG
RL=35 CL=10F
VOUT IOUT
VOUT
IOUT
Figure 16. Current-Limit Response with a Ramped Load
Figure 17. Turn-on/Turn-off Characteristics where RL = 35 and CL = 10F
EN
EN
FLAG
RL = 350 CL = 150F
FLAG
VOUT
VOUT IOUT
IOUT
200mA/DIV
0.5A/DIV
Figure 18. Turn-on/Turn-off Characteristics where RL = 35 and CL = 150F
Figure 19. Short Circuit Response (Enable into Short Circuit)
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
13
PERFORMANCE CHARACTERISTICS
VIN = +5.0V, single MOSFET switch section, and TAMB = +25OC unless otherwise noted.
FLAG
FLAG VOUT
VOUT IOUT IOUT 1A/DIV 2A/DIV
Figure 20. Short Circuit Response (Short Applied to Output)
Figure 21. Short Circuit Response (Short Applied to Output)
5
EN RL = 1
4.5 4
FLAG
3.5
VOUT
VOUT
3 2.5 2 1.5 VIN = 5
IOUT 1A/DIV
1 0.5 0 0 0.5 1 1.5 2 2.5 3 3.5
IOUT
Figure 22. Short Circuit Response (Enable into Short Circuit)
Figure 23. Current Limit Response (Pulsed Load Applied at Output)
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
14
PACKAGE: PLASTIC SMALL OUTLINE (SOIC) (NARROW)
E
H
h x 45 D A O e B A1 L
DIMENSIONS (Inches) Minimum/Maximum (mm) A A1 B D E e H h L O
8-PIN 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)
14-PIN 0.053/0.069 (1.346/1.748) 0.004/0.010 (0.102/0.249) 0.013/0.020 (0.330/0.508)
16-PIN 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 0.386/0.394 (8.552/8.748) (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) 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)
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
15
ORDERING INFORMATION
Model Temperature Range Package Types SP2525-1EN ................................................... -40C to +85C ................................................... 8-pin NSOIC SP2525-1EN/TR .............................................. -40C to +85C ........................... (Tape & Reel) 8-pin NSOIC SP2525-2EN ................................................... -40C to +85C ................................................... 8-pin NSOIC SP2525-2EN/TR .............................................. -40C to +85C ........................... (Tape & Reel) 8-pin NSOIC
Corporation
SIGNAL PROCESSING EXCELLENCE
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
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.
Rev. 8/21/01
SP2525 +3.0 to +5.5 Power Control Switch
(c) Copyright 2001 Sipex Corporation
16

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