FPF2202 [ONSEMI]

集成式负载开关,带 500mA 高精度电流限值;
FPF2202
型号: FPF2202
厂家: ONSEMI    ONSEMI
描述:

集成式负载开关,带 500mA 高精度电流限值

开关 驱动 接口集成电路 驱动器
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June 2008  
FPF2200-FPF2202  
Integrated Load Switch with 500mA High Precision Current Limit  
Features  
General Description  
¢ 1.8 to 5.5V Input Voltage Range  
The FPF2200-FPF2202 are low R  
P-Channel MOSFET  
DS(ON)  
load switches with high precision current limit value. The input  
voltage range operates from 1.8V to 5.5V to fulfill today's Ultra  
Portable Device's supply requirement. Switch control is by a  
logic input (ON) capable of interfacing directly with low voltage  
control signal. On-chip pull-down is available for output quick  
discharge when switch is turned off.  
¢ Typical R  
¢ Typical R  
= 140m@ V = 5.5V  
IN  
DS(ON)  
DS(ON)  
= 160m@ V = 3.3V  
IN  
¢ Fixed 500mA Current Limit (min)  
¢ 5% Accurate Current Limit  
¢ 72(typ) Output Discharge Resistance  
¢ ESD Protected, above 8kV HBM and 2kV CDM  
For the FPF2201, if the constant current condition still persists  
after 30ms, these parts will shut off the switch and pull the fault  
signal pin (FLAGB) low. The FPF2200 has an auto-restart  
feature which will turn the switch on again after 450ms if the ON  
pin is still active. The FPF2201 do not have this auto-restart  
feature so the switch will remain off until the ON pin is cycled.  
For the FPF2202, a current limit condition will immediately pull  
the fault signal pin low and the part will remain in the constant-  
current mode until the switch current falls below the current  
limit. For the FPF2200 through FPF2202, the minimum current  
limit is 500mA with 5% accuracy.  
Applications  
¢ PDAs  
¢ Cell Phones  
¢ GPS Devices  
¢ MP3 Players  
¢ Digital Cameras  
¢ Peripheral Ports  
¢ Notebook Computer  
Pin 1  
BOTTOM  
TOP  
Ordering Information  
Current Limit  
Blanking Time  
(mS)  
Current Limit  
Auto-Restart Time  
(mS)  
ON Pin  
Activity  
Part  
(mA)  
FPF2200  
FPF2201  
FPF2202  
500  
500  
500  
30  
450  
NA  
NA  
Active HI  
Active HI  
Active HI  
30  
NA  
©2008 Fairchild Semiconductor Corporation  
FPF2200-FPF2202 Rev. B  
1
www.fairchildsemi.com  
Typical Application Circuit  
TO LOAD  
V
V
OUT  
IN  
FPF2200/1/2  
FLAGB  
OFF ON  
ON  
GND  
Functional Block Diagram  
V
IN  
UVLO  
THERMAL  
SHUTDOWN  
CONTROL  
LOGIC  
ON  
CURRENT  
LIMIT  
V
OUT  
Output Discharge  
FLAGB  
GND  
2
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Pin Configuration  
ON  
6
5
4
1
2
3
N/C  
GND  
V
IN  
FLAGB  
V
OUT  
MicroFET 2x2 6L  
(BOTTOMVIEW)  
Pin Description  
Pin  
Name  
Function  
1
2
3
N/C  
No Connection  
V
Supply Input: Input to the power switch and the supply voltage for the IC  
Switch Output: Output of the power switch  
IN  
V
OUT  
Fault Output: Active LO, open drain output which indicates an over current, supply  
under voltage or over temperature state  
4
FLAGB  
5
6
GND  
ON  
Ground  
ON/OFF Control Input  
Absolute Maximum Ratings  
Parameter  
Min.  
-0.3  
Max.  
6
Unit  
V
V
, V  
, ON, FLAGB TO GND  
OUT  
IN  
Power Dissipation @ T = 25°C  
1.2  
125  
86  
W
A
Operating and Storage Junction Temperature  
Thermal Resistance, Junction to Ambient  
Electrostatic Discharge Protection  
-65  
°C  
°C/W  
V
HBM  
MM  
8000  
400  
V
CDM  
2000  
V
Recommended Operating Range  
Parameter  
Min.  
1.8  
Max.  
5.5  
Unit  
V
V
IN  
Ambient Operating Temperature, T  
-40  
85  
°C  
A
Electrical Characteristics  
V
=1.8to5.5V, T =-40to+85°Cunlessotherwisenoted.TypicalvaluesareatV =3.3V andT =25°C.  
A IN A  
IN  
Parameter  
Symbol  
Conditions  
Min.  
Typ.  
Max. Units  
Basic Operation  
Operating Voltage  
V
1.8  
5.5  
65  
75  
85  
V
IN  
I
I
I
=0mA, V =V =1.8V  
40  
45  
55  
OUT  
OUT  
OUT  
IN  
ON  
Quiescent Current  
I
=0mA, V =V =3.3V  
A  
Q
IN  
ON  
=0mA, V =V =5.5V  
IN  
ON  
V
GND  
=0V, V =5.5V, V  
=short to  
OUT  
ON  
IN  
V
Shutdown Current  
2.5  
A  
IN  
3
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Parameter  
Symbol  
Conditions  
Min.  
Typ.  
Max. Units  
V
GND  
=0V, V  
=5.5V, V =short to  
OUT IN  
ON  
V
Shutdown Current  
1
A  
OUT  
V
V
V
V
=5.5V, I  
=3.3V, I  
=1.8V, I  
=3.3V, I  
=200mA, T =25°C  
140  
160  
230  
185  
210  
300  
IN  
IN  
IN  
IN  
OUT  
OUT  
OUT  
OUT  
A
=200mA, T =25°C  
A
On-Resistance  
R
mꢀ  
ON  
=200mA, T =25°C  
A
=200mA,  
90  
265  
105  
T =-40°C to 85°C  
A
Output Discharge Resistance  
V
V
V
V
V
V
V
V
V
=3.3V, V =0V, I =10mA  
OUT  
72  
IN  
IN  
IN  
IN  
IN  
ON  
ON  
=1.8V  
=5.5V  
=1.8V  
=5.5V  
0.8  
1.4  
ON Input Logic High Voltage (ON)  
V
V
V
IH  
IL  
0.5  
1.0  
1
ON Input Logic Low Voltage (OFF)  
On Input Leakage  
V
A  
V
= V or GND  
-1  
IN  
=5.5V, I  
=1.8V, I  
=100A  
0.05  
0.12  
0.1  
0.25  
1
IN  
IN  
IN  
SINK  
SINK  
FLAGB Output Logic Low Voltage  
FLAGB Output High Leakage Current  
=100A  
=5.5V, Switch on  
A  
Protections  
Current Limit  
I
V
=3.3V, V  
= 3.0V, T =25°C  
504  
530  
140  
130  
10  
557  
mA  
°C  
LIM  
IN  
OUT  
A
Shutdown Threshold  
Return from Shutdown  
Hysteresis  
Thermal Shutdown  
Under Voltage Shutdown  
Under Voltage Shutdown Hysteresis  
Dynamic  
UVLO  
V
increasing  
1.55  
1.65  
50  
1.75  
V
IN  
mV  
Turn On Time  
t
t
t
t
t
t
R =500, C =0.001uF  
70  
600  
40  
S  
nS  
S  
nS  
mS  
mS  
ON  
L
L
Turn Off Time  
R =500, C =0.001uF  
L L  
OFF  
V
V
Rise Time  
Fall Time  
R =500, C =0.001uF  
L L  
OUT  
OUT  
RISE  
FALL  
BLANK  
RSTRT  
R =500, C =0.001uF  
100  
30  
L
L
Over Current Blanking Time  
Auto-Restart Time  
FPF2200, FPF2201  
FPF2200  
15  
60  
225  
450  
900  
V
= V = 3.3V. Over-Current  
ON  
IN  
Current Limit Response Time  
5
S  
Condition: R  
=1.55ꢀ  
LOAD  
4
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Typical Characteristics  
70  
80  
70  
60  
50  
40  
30  
20  
10  
VON = VIN  
VON=V  
IN  
60  
V =3.3V  
IN  
50  
85oC  
V =5.5V  
IN  
25oC  
-40oC  
40  
V =1.8V  
IN  
30  
20  
10  
1
2
3
4
5
6
-40  
-15  
10  
35  
60  
85  
85  
85  
SUPPLY VOLTAGE (V)  
TJ, JUNCTION TEMPERATURE (oC)  
Figure 1. Quiescent Current vs. Input Voltage  
Figure 2. Quiescent Current vs. Temperature  
1.6  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
1.30  
1.15  
1.00  
0.85  
0.70  
0.55  
0.40  
V =5.5V  
V
IH  
V
IN  
IL  
V =3.3V  
IN  
V =1.8V  
IN  
1
2
3
4
5
6
-40  
-15  
10  
35  
60  
V , SUPPLYVOLTAGE (V)  
IN  
TJ, JUNCTION TEMPERATURE (oC)  
Figure 3. V vs. Input Voltage  
Figure 4. V  
High Voltage vs. Temperature  
ON  
ON  
1.4  
1.2  
1.0  
0.8  
0.6  
0.4  
0.2  
0.04  
0.03  
0.02  
0.01  
0.00  
-0.01  
-0.02  
-0.03  
V =5.5V  
IN  
V =3.3V  
IN  
VON = 5.5V  
V =1.8V  
IN  
VON = 0V  
-40  
-15  
10  
35  
60  
-40  
-15  
10  
35  
60  
85  
TJ, JUNCTION TEMPERATURE (oC)  
TJ, JUNCTION TEMPERATURE (oC)  
Figure 5. V Low Voltage vs. Temperature  
Figure 6. On Pin Current vs. Temperature  
ON  
5
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Typical Characteristics  
600  
590  
580  
570  
560  
550  
540  
530  
600  
500  
400  
300  
200  
100  
0
V
IN = 3.3V  
V
IN = 1.8V  
V
IN = 5.5V  
-40  
-15  
10  
35  
60  
85  
0
1
2
3
4
5
6
TJ, JUNCTION TEMPERATURE (oC)  
V -VOUT (V)  
IN  
Figure 7. Current Limit vs. Output Voltage  
Figure 8. Current Limit vs. Temperature  
300  
270  
240  
210  
180  
150  
120  
90  
300  
270  
240  
210  
180  
150  
120  
90  
V =1.8V  
IN  
85oC  
25oC  
V =3.3V  
IN  
-40oC  
V =5.5V  
IN  
60  
-40  
-15  
10  
35  
60  
85  
1.5  
2.5  
3.5  
4.5  
5.5  
TJ, JUNCTION TEMPERATURE (oC)  
V , SUPPLY VOLTAGE (V)  
IN  
Figure 9. RON vs. Input Voltage  
Figure 10. RON vs. Temperature  
1000  
100  
10  
100  
10  
1
TFALL  
VIN = 3.3V  
RL = 500 Ohms  
COUT = 0.11uF  
TOFF  
TON  
TRISE  
VIN = 3.3V  
1
RL = 500 Ohms  
COUT = 0.11uF  
0.1  
0.1  
-40  
-15  
10  
35  
60  
85  
-40  
-15  
10  
35  
60  
85  
TJ, JUNCTION TEMPERATURE (oC)  
TJ, JUNCTION TEMPERATURE (oC)  
Figure 11. TON / TOFF vs. Temperature  
Figure 12. TRISE / TFALL vs. Temperature  
6
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Typical Characteristics  
40  
38  
36  
34  
32  
30  
28  
VIN  
2V/DIV  
IOUT  
10mA/DIV  
VON  
2V/DIV  
VIN=3.3V,  
RL=500,  
CIN=10F  
VOUT  
2V/DIV  
-40  
-15  
10  
35  
60  
85  
TJ, JUNCTION TEMPERATURE ( C)  
100s/DIV  
Figure 13. TBLANK vs Temperature  
Figure 14. TON Response  
VIN  
2V/DIV  
VON  
5V/DIV  
VIN=3.3V,  
RL=500,  
C
IN=10F  
VIN=3.3V,  
RL=5,  
IN=10F  
IOUT  
500mA/DIV  
IOUT  
10mA/DIV  
C
VFLAGB  
2V/DIV  
TBLANK  
VON  
2V/DIV  
VOUT  
2V/DIV  
VOUT  
2V/DIV  
500ns/DIV  
10ms/DIV  
Figure 15. TOFF Response  
Figure 16. TBLANK Response  
VIN=3.3V,  
RL=1.2,  
CIN=10F  
COUT=10F  
VIN=5V,  
RL=1.2,  
CIN=10F  
COUT=10F  
VON  
2V/DIV  
VON  
2V/DIV  
IOUT  
IOUT  
500mA/DIV  
500mA/DIV  
VIN  
VIN  
2V/DIV  
2V/DIV  
VOUT  
VOUT  
2V/DIV  
2V/DIV  
100s/DIV  
500s/DIV  
Figure 17. Current Limit Response  
(Output is loaded with 1.2resistor and COUT=10F)  
Figure 18. Current Limit Response  
(Output is loaded with 1.2resistor and COUT=100F)  
7
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Typical Characteristics  
VIN=3.3V,  
RL=100,  
CIN=10F  
COUT=1F  
VON  
2V/DIV  
VON  
2V/DIV  
IOUT  
5A/DIV  
IOUT  
500mA/DIV  
VIN=VON=,3.  
3V, RL=1.2,  
CIN=10F  
COUT=1F  
VOUT  
VOUT  
2V/DIV  
2V/DIV  
100s/DIV  
20s/DIV  
Figure 19. Current Limit Response  
(Switch is powered into a short - Input and  
enable pins are tied together)  
Figure 20. Current Limit Response  
(Output shorted to GND while the switch is in normal operation)  
8
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Description of Operation  
The FPF2200, FPF2201, and FPF2202 are state of the art High  
Precision Current Limit switches designed to meet USB OTG  
(On-The-Go) applications with optimum current for a safe  
design practice. The core of each device is a 0.16P-channel  
MOSFET and a controller capable of functioning over an input  
operating range of 1.8- 5.5V. The controller protects or offers  
current limiting, UVLO(undervoltage lockout) and thermal  
shutdown protection. The minimum current limit value is set to  
500mA allowing to draw as much as 500mA from the USB port.  
Undervoltage Lockout (UVLO)  
The undervoltage lockout turns-off the switch if the input voltage  
drops below the undervoltage lockout threshold. With the ON  
pin active the input voltage rising above the undervoltage  
lockout threshold will cause a controlled turn-on of the switch  
which limits current over-shoots.  
Output Discharge Resistor  
The FPF2200/1/2 family contains an 80on-chip load resistor  
for quick output discharge when the switch is turned off. This  
features become more attractive when application requires  
large output capacitor to be discharged when switch turns-off.  
However, VOUT pin should not be connected directly to the  
battery source due to the discharge mechanism of the load  
switch.  
On/Off Control  
The ON pin is active high, and controls the state of the switch.  
Applying a continuous high signal will hold the switch in the ON  
state. The switch will move into the OFF state when the active  
high is removed, or if a fault is encountered. For all versions, an  
undervoltage on VIN or a junction temperature in excess of  
140°C overrides the ON control to turn off the switch.  
Thermal Shutdown  
In addition, excessive currents will cause the switch to turn off in  
the FPF2200 and FPF2201. The FPF2200 has an Auto-Restart  
feature which will automatically turn the switch ON again after  
450ms. For the FPF2201, the ON pin must be toggled to turn-on  
the switch again. The FPF2202 does not turn off in response to  
an over current condition but instead remains operating in a  
constant current mode so long as ON is active and the thermal  
shutdown or UVLO have not activated.  
The thermal shutdown protects the die from internally or  
externally generated excessive temperatures. During an over-  
temperature condition the FLAGB is activated and the switch is  
turned-off. The switch automatically turns-on again if  
temperature of the die drops below the threshold temperature.  
Fault Reporting  
Upon the detection of an over-current condition, an input UVLO,  
or an over-temperature condition, the FLAGB signals the fault  
mode by activating LO. In the event of an over-current condition  
for the FPF2200 and FPF2201, the FLAGB goes LO at the end  
of the blanking time while FLAGB goes LO immediately for the  
FPF2202. If the over-current condition lasts longer than  
blanking time, FLAGB remains LO through the Auto-Restart  
Time for the FPF2200 while for the FPF2201, FLAGB is latched  
LO and ON must be toggled to release it. With the FPF2202,  
FLAGB is LO during the faults and immediately returns HI at the  
end of the fault condition. FLAGB is an open-drain MOSFET  
which requires a pull-up resistor between VIN and FLAGB.  
During shutdown, the pull-down on FLAGB is disabled to reduce  
current draw from the supply. A 100Kpull up resistor is  
recommended to be used in the application.  
Current Limiting  
The current limit ensures that the current through the switch  
doesn't exceed a maximum value while not limiting at less than  
a minimum value. The minimum current at which the parts will  
limit is set to 500mA. The FPF2200 and FPF2201 have a  
blanking time of 30ms (nominal) during which the switch will act  
as a constant current source. At the end of the blanking time,  
the switch will be turned-off. The FPF2202 has no current limit  
blanking period so it will remain in a constant current state until  
the ON pin is deactivated or the thermal shutdown turns-off the  
switch.  
9
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Application Information  
PCB Layout Recommendations  
Input Capacitor  
To limit the voltage drop on the input supply caused by transient  
in-rush currents when the switch is turned on into a discharged  
load capacitor or a short-circuit, a capacitor is recommended to  
be placed between VIN and GND. A 1uF ceramic capacitor, CIN  
placed close to the pins is usually sufficient. Higher values of  
CIN can be used to further reduce the voltage drop.  
For best performance, all traces should be as short as possible.  
To be more effective, the input and output capacitors should be  
placed close to the device to minimize the effects that parasitic  
trace inductances may have on normal and short-circuit  
operation. Using wide traces for VIN, VOUT and GND will help  
minimize parasitic electrical effects along with minimizing the  
case to ambient thermal impedance.  
,
Output Capacitor  
Improving Thermal Performance  
A 0.1uF capacitor COUT, should be placed between VOUT and  
GND. This capacitor will prevent parasitic board inductances  
from forcing VOUT below GND when the switch turns-off. For the  
FPF2200 and FPF2201, the total output capacitance needs to  
be kept below a maximum value, COUT(max), to prevent the  
part from registering an over-current condition and turning-off  
the switch. The maximum output capacitance can be  
determined from the following formula:  
An improper layout could result in higher junction temperature  
and triggering the thermal shutdown protection feature. This  
concern applies when the switch is set at higher current limit  
value and an over-current condition occurs. In this case, the  
power dissipation of the switch, from the formula below, could  
exceed the maximum absolute power dissipation of 1.2W.  
PD = (VIN - VOUT) x ILIM (Max)  
ILIM (Max) X tBLANK (Min)  
The following techniques have been identified to improve the  
COUT (Max)  
=
thermal performance of this family of devices.  
These  
VIN  
techniques are listed in order of the significance of their impact.  
Power Dissipation  
1. Thermal performance of the load switch can be improved by  
connecting pin7 of the DAP (Die Attach Pad) to the GND plane  
of the PCB.  
During normal on-state operation, the power dissipated in the  
device will depend upon the level at which the current limit is  
set. The maximum allowed setting for the current limit is 500mA  
and will result in a power dissipation of:  
2. Embedding two exposed through-hole vias into the DAP  
(pin7) provides a path for heat to transfer to the back GND  
plane of the PCB. A drill size of Round, 14 mils (0.35mm) with  
1-ounce copper plating is recommended to result in appropriate  
solder reflow. A smaller size hole prevents the solder from  
penetrating into the via, resulting in device lift-up. Similarly, a  
larger via-hole consumes excessive solder, and may result in  
voiding of the DAP.  
P = (ILIM)2 * RON = (0.5)2 * 0.16 = 40mW  
If the part goes into current limit, the maximum power  
dissipation will occur when the output is shorted to ground. For  
the FPF2200, the power dissipation will scale by the Auto-  
Restart Time, tRSTRT, and the Over Current Blanking Time,  
tBLANK, so that the maximum power dissipated is:  
tBLANK  
P (Max)  
=
* VIN (Max) * ILIM (Max)  
tBLANK + tRSTRT  
30  
=
* 5.5 * 0.5 = 0.17W  
30 + 450  
Note this is below the maximum package power dissipation, and  
the thermal shutdown feature will act as additional safety to  
protect the part from damage due to excessive heating. The  
junction temperature is only able to increase to the thermal  
shutdown threshold. Once this temperature has been reached,  
toggling ON will not turn-on the switch until the junction  
temperature drops. For the FPF2202, a short on the output will  
cause the part to operate in a constant current state dissipating  
a worst case power of:  
Figure 21: Two through hole open vias embedded in DAP  
3. The VIN, VOUT and GND pins will dissipate most of the heat  
generated during a high load current condition. The layout  
suggested in Figure 23 provides each pin with adequate copper  
so that heat may be transferred as efficiently as possible out of  
the device. The low-power FLAGB and ON pin traces may be  
laid-out diagonally from the device to maximize the area  
available to the ground pad. Placing the input and output  
capacitors as close to the device as possible also contributes to  
heat dissipation, particularly during high load currents.  
P (Max) = VIN (MAX) * ILIM (MAX) = 5.5 * 0.557 = 3.064W  
This large amount of power will activate the thermal shutdown  
and the part will cycle in and out of thermal shutdown so long as  
the ON pin is active and the short is present.  
10  
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
Figure 22: X-Ray result (bottom view with 45o angle)  
Figure 25: Bottom and ASB Layers  
Figure 26: Zoom in to Top layer  
Figure 23: Proper layout of output and ground copper area  
FPF22XX Demo Board  
FPF22XX Demo board has components and circuitry to  
demonstrate FPF2223/4/5 load switches functions and features.  
R4 resistor with 0value is used for measuring the output  
current. Load current can be scoped by removing the R4  
resistor and soldering a current loop to the R4 footprint. Thermal  
performance of the board is improved using a few techniques  
recommended in the layout recommendations section of  
datasheet. R3 resistor should be left open for FPF220X family.  
Figure 24: Top, SST, and AST Layers  
11  
www.fairchildsemi.com  
FPF2200-FPF2202 Rev. B  
0.05 C  
2.0  
A
1.72  
1.68  
2X  
B
4
6
0.15  
1.21  
2.0  
0.90  
2.25  
0.52(6X)  
0.05 C  
1
3
PIN#1 IDENT  
TOP VIEW  
2X  
0.42(6X)  
0.65  
RECOMMENDED  
LAND PATTERN  
ꢂꢁꢈꢃ“ꢂꢁꢂꢃ  
0.10 C  
ꢂꢁꢀꢂ“ꢂꢁꢂꢃ  
NOTES:  
0.08 C  
SIDE VIEW  
C
ꢂꢁꢂꢀꢃ“ꢂꢁꢂꢀꢃ  
A. PACKAGE DOES NOT FULLY CONFORM  
TO JEDEC MO-229 REGISTRATION  
SEATING  
PLANE  
B. DIMENSIONS ARE IN MILLIMETERS.  
C. DIMENSIONS AND TOLERANCES PER  
ASME Y14.5M, 2009.  
ꢀꢁꢂꢂ“ꢂꢁꢂꢃ  
ꢄꢁꢅꢂ“ꢂꢁꢂꢃ  
D. LAND PATTERN RECOMMENDATION IS  
EXISTING INDUSTRY LAND PATTERN.  
(0.70)  
PIN #1 IDENT  
(0.20)4X  
E. DRAWING FILENAME: MKT-MLP06Krev5.  
1
6
3
(0.40)  
ꢂꢁꢇꢀ“ꢂꢁꢂꢃ  
(6X)  
ꢂꢁꢆꢂ“ꢂꢁꢂꢃ  
(0.60)  
4
(6X)  
C A B  
ꢂꢁꢇꢂ“ꢂꢁꢂꢃ  
0.10  
0.65  
1.30  
0.05  
C
BOTTOM VIEW  
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are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.  
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