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FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
February 2007
FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
Features
4.5 to 20V Input Voltage Range Controlled Turn-On 0.4A, 0.8A and Adjustable Current Limit Option Undervoltage Lockout Thermal Shutdown <10uA Shutdown Current Auto Restart Fault Blanking
tm
General Description
The FPF2500 through FPF2506 is a family of load switches which provide full protection to systems and loads which may encounter large current conditions. These devices contain a 0.23 current-limited N-channel MOSFET which can operate over an input voltage range of 4.5-20V. Switch control is by a logic input (ON) capable of interfacing directly with low voltage control signals. Each part contains thermal shutdown protection which shuts off the switch to prevent damage to the part when a continuous over-current condition causes excessive heating. When the switch current reaches the current limit, the part operates in a constant-current mode to prohibit excessive currents from causing damage. For the FPF2500, FPF2501, FPF2503 and FPF2505, if the constant current condition still persists after 5ms, these parts will shut off the switch and, for the FPF2503 and FPF2505, the fault signal pin (FLAGB) will be pulled low. The FPF2500, FPF2503, and FPF2505, have an auto-restart feature which will turn the switch on again after 640ms if the ON pin is still active. The FPF2501 does not have this auto-restart feature so the switch will remain off until the ON pin is cycled. For the FPF2502, FPF2504 and FPF2506, 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 FPF2500 through FPF2502, the minimum current limit is adjustable from 500mA to 2A. For the FPF2503 and FPF2504 the minimum current is internally fixed at 400mA while that for the FPF2505 and FPF2506 is internally fixed at 800mA. These parts are available in a space-saving 5 pin SOT23 package.
Applications
PDAs Motor Drivers Cell Phones Digital Cameras RoHS Compliant
Ordering Information
Current Limit Blanking Time [ms]
2.5/5/10 2.5/5/10 0 2.5/5/10 0 2.5/5/10 0
Part
FPF2500 FPF2501 FPF2502 FPF2503 FPF2504 FPF2505 FPF2506
Current Limit [A]
Adjustable (0.5-2.0 +/-30%) Adjustable (0.5-2.0 +/-30%) Adjustable (0.5-2.0 +/-30%) 0.4/0.6/0.8 0.4/0.6/0.8 0.8/1.2/1.6 0.8/1.2/1.6
Auto-Restart Time [ms]
320/640/1280 NA NA 320/640/1280 NA 320/640/1280 NA
Fault Pin
No No No Yes Yes Yes Yes
(c)2007 Fairchild Semiconductor Corporation FPF2500-FPF2506 Rev. D4
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FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
Typical Application Circuit
VIN VOUT TO LOAD FPF2500-FPF2502 OFF ON 5.5V max ON GND ISET
5.5V max VIN VOUT TO LOAD
FPF2503- FPF2506
-
OFF ON 5.5V max
ON GND
FLAGB
Functional Block Diagram
VIN
UVLO
ON
CONTROL LOGIC
CURRENT LIMIT THERMAL SHUTDOWN VOUT ISET
FPF2500, FPF2501, FPF2502
GND
VIN
UVLO
ON
CONTROL LOGIC
THERMAL SHUTDOWN
CURRENT LIMIT VOUT FLAGB
FPF2503, FPF2504 FPF2505, FPF2506
GND
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FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
Pin Configuration
VOUT 1 GND FLAGB/ISET 2 3 SOT23-5 4 ON 5 VIN
Pin Description
Pin
1 2
Name
VOUT GND FLAGB Ground
Function
Switch Output: Output of the power switch Fault Output (FPF2503-FPF2506): Active LO, open drain output which indicates on over current supply under voltage or over temperature state. Adjustable Current Limit Setting Resistor (FPF2500-FPF2502): An external resistor connected between this pin and ground sets the current limit value. ON Control Input: Supply Input: Input to the power switch and the supply voltage for the IC
3 ISET 4 5 ON VIN
Absolute Maximum Ratings
Parameter
VIN, VOUT, to GND ON, FLAGB, ISET to GND Power Dissipation @ TA=25C (Note 1) Operating Temperature Range Storage Temperature Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection HBM MM 2000 200 -40 -65
Min.
-0.3 -0.3
Max.
20 5.5 667 125 150 150
Unit
V V mW C C C/W V V
Recommended Operating Range
Parameter
VIN Ambient Operating Temperature, TA
Min.
4.5 -40
Max.
20 85
Unit
V C
Electrical Characteristics
VIN = 4.5 to 20V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 12V and TA = 25C.
Parameter
Basic Operation Operating Voltage Quiescent Current Shutdown Current Latch-Off Current On-Resistance
Symbol
VIN IQ ISHDN ILATCHOFF RON FPF2501
Conditions
Min.
4.5
Typ.
Max.
20
Unit
V A A A
IOUT = 0mA, VIN = 12V, Von=5V
60 45 230 300
100 1
TA = 25C, IOUT = 50mA TA = -40 to +85C, IOUT = 50mA
320
m
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FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
Electrical Characteristics Cont.
VIN = 4.5 to 20V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 12V and TA = 25C.
Parameter
ON Input Logic High Voltage ON Input Logic Low Voltage ON Input Leakage Off Switch Leakage FLAGB Output Logic Low Voltage FLAGB Output High Leakage Current Protections
Symbol
VIH VIL ISWOFF
Conditions
VIN = 4.5V to 20V VIN = 4.5V to 20V VON = 5V or GND VON = 0V, VOUT = 0V VIN = 5V, ISINK = 10mA VIN = 5V, Switch on FPF2503 FPF2504
Min.
0.9
Typ.
Max.
0.4
Unit
V V A A V A
-1 0.01 0.1
1 0.2 1
400 800
600 1200
800 1600 mA
Current Limit
ILIM
TA=25 C
FPF2505 FPF2506 FPF2500 FPF2501 FPF2502
0.7xINOM
1.0xINOM
1.3xINOM
Thermal Shutdown Under Voltage Shutdown Under Voltage Shutdown Hysteresis Dynamic Turn on time Turn off time VOUT Rise Time VOUT Fall Time Over Current Blanking Time Auto-Restart Time Short Circuit Response Time tON tOFF tR tF tBLANK tRESTART UVLO
TJ Increasing TJ Decreasing VIN Increasing 3.75
140 130 3.85 100 4.00
C C V mV ms ms ms ms 10 1280 ms ms s
RL=500, CL=1uF RL=500, CL=1uF RL=500, CL=1uF RL=500, CL=1uF FPF2500, FPF2501, FPF2503, FPF2505 FPF2500, FPF2503, FPF2505 VIN = 12V, VON = 5V Moderate Overcurrent Condition 2.5 320
1 0.1 3 1.5 5 640 3
Note 1: Package power dissipation on 1square inch pad, 2 oz. copper board.
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FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
80
80
V ON = 5V
75 SUPPLY CURRENT (uA) 70 65 60 55 50 45
75
VIN = 20V
SUPPLY CURRENT (uA)
70 65 60 55 50 4 6 8 10 12 14 16 18 20
VIN = 12V
VIN = 4.5V
SUPPLY VOLTAGE (V)
40 -40
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE ( C)
Figure 1. Quiescent Current vs. Input Voltage
Figure 2. Quiescent Current vs. Temperature
8.0 7.5 SUPPLY CURRENT (uA) 7.0 6.5 6.0 5.5 5.0 4.5 4.0 -40 VIN = 12V I_SHDN VIN = 20V
SUPPLY CURRENT (uA)
0.036 I_SWOFF 0.032
0.028 VIN = 20V 0.024 VIN = 12V 0.02
-15
10
35
o
60
85
0.016 -40
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE ( C)
TJ, JUNCTION TEMPERATURE ( C)
Figure 3. ISHUTDOWN Current vs. Temperature
Figure 4. ISWITCH-OFF Current vs. Temperature
0.80 0.75 ON THRESHOLD (V) 0.70 0.65 0.60 0.55 0.50 4 6 8 10 12 14 16 18 20 VIN, Input Voltage (V)
320 VIN = 12V 300 280 RON (mOhms) 260 240 220 200 180 160 -40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 5. VIH vs. VIN
Figure 6. R(ON) vs. Temperature
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FPF2500-FPF2506 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
1400
1400
RSET = 20k
1200 OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA) 1200 1000 800 600 400 200 0
FPF2505, 2506
1000
FPF2500, 2501, 2502
800 600 400 200 0 0 1 2 3 4 5 6 7 8 9 10 11 12 VIN - VOUT (V)
FPF2503, 2504
0
1
2
3
4
5
6
7
8
9
10
11
12
VIN - VOUT (V)
Figure 7. Current Limit vs. Output Voltage
Figure 8. Current Limit vs. Output Voltage
1400
FPF2500, 2501, 2502
1300 OUTPUT CURRENT (mA) 1200 1100 1000 900 800 700 600 -40
OUTPUT CURRENT (mA)
1600 1400 1200 1000 800 600 400 200 0 -40
FPF2505, 2506
FPF2503, 2504
-15
10
35
o
60
85
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE ( C)
TJ, JUNCTION TEMPERATURE (oC)
Figure 9. Current Limit vs. Temperature
Figure 10. Current Limit vs. Temperature
10
ILOAD = 10mA VCC = 12V
10
ILOAD = 10mA VCC = 12V TD(ON)
1
TURN-ON/OFF TIMES (mS)
DELAY TIMES (mS)
0.1
TD(OFF)
T(RISE)
T(FALL)
0.01 -40
-15
10
35
60
85
1 -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
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Typical Characteristics
7
800
FLAG-BLANKING TIME (mS)
RESTART TIME (mS)
6
700
5
600
4
3 -40
-15
10
35
60
85
500 -40
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE ( C)
Figure 13. TBLANK vs. Temperature
Figure 14. TRESTART vs. Temperature
VDRV (Note 2) 5V/DIV VOUT 10V/DIV IOUT 1A/DIV FLAGB 5V/DIV
VIN = 12V
VDRV (Note 2) 5V/DIV VOUT 10V/DIV IOUT 1A/DIV FLAGB 5V/DIV 5ms/DIV
VIN = 12V
TRESTART
100ms/DIV Figure 16. TRESTART Response (FPF2505)
Figure 15. TBLANK Response (Switch is turned on to an overcurrent condition)
VON 5V/DIV
VON 5V/DIV
IOUT 10mA/DIV VIN=12V, CIN=10uF RL=500, CL=1uF 2ms/DIV Figure 17. TON Response
IOUT 10mA/DIV VIN=12V, CIN=10uF RL=500, CL=1uF 2us/DIV Figure 18. TOFF Response
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Typical Characteristics
VIN 10V/DIV
VIN 10V/DIV VON 5V/DIV VIN=12V, CIN=10uF COUT=1uF, CIN=10uF VON=5V 20us/DIV Figure 19. Short Circuit Response (Output is shorted to GND) 1ms/DIV Figure 20. Current Limit Response IOUT 1A/DIV RL=4.7, CL=1uF
IOUT 10A/DIV
VOUT 10V/DIV
Note 2: VDRV signal forces the device to go into overcurrent condition.
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Description of Operation
The FPF2500 - FPF2506 are current limited switches that protect systems and loads which can be damaged or disrupted by the application of high currents. The core of each device is a 0.23 N-channel MOSFET and a controller capable of functioning over a wide input operating range of 4.5 V -20 V. The controller protects against system malfunctions through current limiting under-voltage lockout and thermal shutdown. The current limit for FPF2500, FPF2501 and FPF2502 is adjustable from 500 mA to 2 A through the selection of an external resistor. The FPF2503 and FPF2504 the minimum current is internally fixed at 400 mA while that for the FPF2505 and FPF2506 is internally fixed at 800mA.
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. For the FPF2500, FPF2501 and FPF2502, the current at which the parts will limit is adjustable through the selection of an external resistor connected to ISET. Information for selecting the resistor is found in the Application Info section. For the FPF2503 and FPF2504 the minimum current is 400mA and the maximum current is 800mA and for the FPF2505FPF2506 the minimum current is 800mA and the maximum current is 1600mA. The FPF2500, FPF2501, FPF2503 and FPF2505 have a blanking time of 5ms, nominally, during which the switch will act as a constant current source. At the end of the blanking time, the switch will be turned-off. For FPF2503 and FPF2505, at the end of the blanking time, the switch will be turned-off and the FLAGB pin will activate to indicate that current limiting has occurred. The FPF2502, FPF2504 and FPF2506 have no current limit blanking period so they will remain in a constant current state. For FPF2504 and FPF2506, immediately upon a current limit condition FLAGB is activated. The FPF2502, FPF2504 and FPF2506 devices will remain in constant current state until the ON pin is cycled or the thermal shutdown turns-off the switch.
On/Off Control
The ON pin controls the state of the switch. When ON is high, the switch is in the on state. Activating ON continuously holds the switch in the on state so long as there is no fault. For all versions, an under-voltage on VIN or a junction temperature in excess of 140C overrides the ON control to turn off the switch. In addition, excessive currents will cause the switch to turn off in the FPF2500, FPF2501, FPF2503 and FPF2505. The FPF2500, FPF2503 and FPF2505 have an Auto-Restart feature which will automatically turn the switch on again after 640ms. For the FPF2501, the ON pin must be toggled to turn-on the switch again. The FPF2502, FPF2504 and FPF2506 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 under-voltage lockout have not activated.
Under-Voltage Lockout
The under-voltage lockout turns-off the switch if the input voltage drops below the under-voltage lockout threshold. With the ON pin active, the input voltage rising above the under-voltage lockout threshold will cause a controlled turn-on of the switch which limits current over-shoots.
Thermal Shutdown
The thermal shutdown protects the die from internally or externally generated excessive temperatures. During an over-temperature condition the switch is turned-off. The switch automatically turns-on again if the temperature of the die drops below the threshold temperature.
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Application Information Typical Application
VIN
VOUT
FPF2500-FPF2502
Battery 12V OFF ON C1=10uF 5.5V max ON GND RSET ISET C2=1uF R2=240
5.5V max VIN VOUT R1=100K R2=240 C2=1uF
FPF2503-FPF2506
Battery 12V
-
OFF ON C1=10uF 5.5V max
ON GND
FLAGB
Setting Current Limit
The FPF2500, FPF2501, and FPF2502 have a current limit which is set with an external resistor connected between ISET and GND. This resistor is selected by using the following equation,
Current Limit Various RSET Values
RSET [K] 7.87 10.0 12.4 14.7 17.4 20.5 23.2 26.7 30.9 34.8 39.0 43.2 48.7 53.6 29.0 64.9 Min. Current Limit [A] 0.375 0.450 0.525 0.600 0.675 0.750 0.825 0.900 0.975 1.050 1.125 1.200 1.275 1.350 1.425 1.500 Typ. Current Limit [A] 0.500 0.600 0.700 0.800 0.900 1.000 1.100 1.200 1.300 1.400 1.500 1.600 1.700 1.800 1.900 2.000 Max. Current Limit [A] 0.625 0.750 0.875 1.000 1.125 1.250 1.375 1.500 1.625 1.750 1.875 2.000 2.125 2.250 2.375 2.500
R SET = 12500 x ISET x e
( 0.485 x I SET )
(1)
RSET is in Ohms and ISET is in Amps The following table can also be used to select RSET. A typical application would be the 0.500A current that is required by a single USB port. Using the table below an appropriate selection for the RSET resistor would be 12.4K. This will ensure that the port load could draw 0.525A, but not more than 0.875A. Likewise for a dual port system, an RSET of 34.8K would always deliver at least 1.050A and never more than 1.750A.
Input Capacitor
To limit the voltage drop on the input supply caused by transient in-rush currents when the switch turns-on into a discharged load capacitor or a short-circuit, a capacitor needs to be placed between VIN and GND. A 0.1uF ceramic capacitor, CIN, placed close to the pins is usually sufficient. Higher values of CIN can be used to further reduce the voltage drop.
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Output Capacitor
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 FPF2501, FPF2503 and FPF2505, 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,
Board Layout
For best performance, all traces should be as short as possible. To be most 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.
I LIM ( min ) x t BLANK ( min ) C OUT ( max ) = ----------------------------------------------------------------V IN
(2)
Power Dissipation
Due to the wide input voltage range that the parts can accept and the high currents at which the current limit can be set, care must be taken to prevent excessive power dissipation in the part from interrupting the switching of power to a load. During normal operation as a switch, the power dissipated in the part will depend upon the level at which the current limit is set. For a 0.5A typical load, the power dissipated will typically be,
P = ( I LIM ) x R DS = ( 0.5 ) x 0.23 = 58mW
2
2
(3)
This is well within the thermal capability of the package. The maximum allowed setting for the current limit is 2A and this will result in a power dissipation of typically,
P = ( I LIM ) x R DS = ( 2 ) x 0.23 = 920mW
2
2
(4)
This is beyond the normal thermal capability of the package, but the thermal shutdown within the part will prevent damage by turning off the switch once the maximum junction temperature has been reached. If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. For the FPF2500, FPF2503 and FPF2505 the power dissipation will scale by the Auto-Restart Time, tRESTART, and the Over Current Blanking Time, tBLANK, so that the maximum power dissipated is,
t BLANK P ( max ) = -------------------------------------------------- x V IN ( max ) x I LIM ( max ) t RESTART + t BLANK 5(5) = ------------------ x 20 x 2.5 = 388mW 5 + 640
This is more power than the package can dissipate, but the thermal shutdown of the part will activate to protect the part from damage due to excessive heating. The junction temperature will only be 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 FPF2502, FPF2504 and FPF2506, a short on the output will cause the part to operate in a constant current state dissipating a worst case power of,
P ( max ) = V IN ( max ) x I LIM ( max ) = 20 x 2.5 = 50W (6)
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.
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Dimensional Outline and Pad Layout
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TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. ACEx(R) Across the board. Around the world.TM ActiveArrayTM BottomlessTM Build it NowTM CoolFETTM CROSSVOLTTM CTLTM Current Transfer LogicTM DOMETM E2CMOSTM EcoSPARK(R) EnSignaTM FACT Quiet SeriesTM FACT(R) FAST(R) FASTr(R) FPSTM FRFET(R) GlobalOptoisolatorTM GTOTM HiSeCTM i-LoTM ImpliedDisconnectTM IntelliMAXTM ISOPLANARTM MICROCOUPLERTM MicroPakTM MICROWIRETM MSXTM MSXProTM OCXTM OCXProTM OPTOLOGIC(R) OPTOPLANAR(R) PACMANTM POPTM Power220(R) Power247(R) PowerEdgeTM PowerSaverTM PowerTrench(R) Programmable Active DroopTM QFET(R) QSTM QT OptoelectronicsTM Quiet SeriesTM RapidConfigureTM RapidConnectTM ScalarPumpTM SMART STARTTM SPM(R) SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 TCMTM The Power Franchise(R) TM TinyBoostTM TinyBuckTM TinyLogic? TINYOPTOTM TinyPowerTM TinyWireTM TruTranslationTM SerDesTM UHC(R) UniFETTM VCXTM WireTM
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD 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. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD'S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. This datasheet contains preliminary data, and supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design. This datasheet contains specifications on a product that has been discontinued by Fairchild semiconductor. The datasheet is printed for reference information only.
Rev. I23
2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
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