Fairchild FPF2193 Full function load switch with adjustable current limit Datasheet

FPF2193/4/5
Full Function Load Switch with Adjustable Current Limit
Features
tm
General Description
1.8 to 5.5V Input Voltage Range
The FPF2193, FPF2194, and FPF2195 is a series of load
switches which provides full protection to systems and loads
which may encounter large current conditions. These devices
contain a 55mΩ current-limited P-channel MOSFET which can
operate over an input voltage range of 1.8-5.5V. Internally,
current is prevented from flowing when the MOSFET is off and
the output voltage is higher than the input voltage. 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.
Controlled Turn-On
0.15-1.5A Adjustable Current Limit
Undervoltage Lockout
Thermal Shutdown
<2uA Shutdown Current
Auto Restart
Fast Current limit Response Time
5us to Moderate Over Currents
30ns to Hard Shorts
Fault Blanking
When the switch current reaches the current limit, the parts
operate in a constant-current mode to prohibit excessive
currents from causing damage. For the FPF2193 and FPF2194,
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 FPF2193 has an auto-restart feature which will turn the
switch on again after 450ms if the ON pin is still active. The
FPF2194 does not have this auto-restart feature so the switch
will remain off until the ON pin is cycled. The FPF2195 will not
turn off after a current limit fault, but will rather remain in the
constant current mode indefinitely. The minimum current limit is
150mA.
Reverse Current Blocking
RoHS Compliant
Applications
PDAs
Cell Phones
GPS Hand-held Devices
Portable Enterprise / Industrial Devices
Digital Cameras
Peripheral Ports and Accessories
These parts are available in a space-saving 6 ball advanced.
Pb-Free 1 x 1.5 mm CSP package.
Portable Medical Equipment
Hot Swap Supplies
Pin 1
ON
VIN
FLAGB
VOUT
GND
ISET
TOP
BOTTOM
Ordering Information
Part
Current Limit
[mA]
Current Limit
Blanking Time
[ms]
Auto-Restart
Time
[ms]
ON Pin
Activity
Top Mark
FPF2193
150-1500
15/30/60
225/450/900
Active HI
G
FPF2194
150-1500
15/30/60
NA
Active HI
H
FPF2195
150-1500
0
NA
Active HI
J
©2007 Fairchild Semiconductor Corporation
FPF2193/4/5 Rev. F
1
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
October 2007
TO LOAD
VIN
FPF2193/4/5
VOUT
FLAGB
OFF ON
ON
ISET
GND
Functional Block Diagram
VIN
UVLO
REVERSE
CONTROL
LOGIC
ON
CURRENT
BLOCKING
CURRENT
LIMIT
VOUT
ISET
THERMAL
SHUTDOWN
FLAGB
GND
FPF2193/4/5 Rev. F
2
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Application Circuit
A2
A1
B2
B1
C2
C1
1.0 x 1.5 CSP Bottom View
Pin Description
Pin
Name
C1
ISET
Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch.
B2
VIN
Supply Input: Input to the power switch and the supply voltage for the IC
B1
VOUT
A1
FLAGB
C2
GND
A2
ON
Function
Switch Output: Output of the power switch
Fault Output: Active LO, open drain output which indicates an over current supply under
voltage or over temperature state.
Ground
ON Control Input: Active Hi
Absolute Maximum Ratings
Parameter
Min.
VIN, VOUT, ON, FLAGB, ISET to GND
Max.
-0.3
Power Dissipation @ TA = 25°C (Note 1)
Unit
6
V
1.2
W
Operating Temperature Range
-40
125
°C
Storage Temperature
-65
150
°C
85
°C/W
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
HBM
8000
V
MM
400
V
Recommended Operating Range
Parameter
Min.
Max.
Unit
VIN
1.8
5.5
V
Ambient Operating Temperature, TA
-40
85
°C
Electrical Characteristics
VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C.
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Units
5.5
V
Basic Operation
Operating Voltage
VIN
Quiescent Current
IQ
On-Resistance
RON
1.8
IOUT = 0mA
VON = VIN
VIN = 1.8V
70
VIN = 3.3V
75
VIN = 5.5V
TA = 25°C, IOUT = 200mA
TA = -40 to +85°C, IOUT = 200mA
A
80
55
80
135
mΩ
Note 1: Package power dissipation on 1square inch pad, 2 oz. copper board.
FPF2193/4/5 Rev. F
3
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Pin Configuration
VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C.
Parameter
Symbol
ON Input Logic High Voltage (ON)
VIH
ON Input Logic Low Voltage
VIL
Conditions
Min.
VIN = 1.8V
0.8
VIN = 5.5V
1.4
0.5
1.0
-1
VIN Shutdown Current
VON = 0V, VIN = 5.5V,
VOUT = short to GND
-2
Units
V
VIN = 1.8V
VON = VIN or GND
FLAGB Output High Leakage Current
Max.
VIN = 5.5V
ON Input Leakage
FLAGB Output Logic Low Voltage
Typ.
0
1
A
2
A
VIN = 5V, ISINK = 10mA
0.05
0.2
VIN = 1.8V, ISINK = 10mA
0.12
0.3
VIN = 5V, Switch ON
V
V
1
A
2
A
Reverse Block
VON = 0V, VOUT = 5.5V,
VIN = short to GND
VOUT Shutdown Current
-2
Vbreakdown
VIN = VON = 0V, IOUT = 200 A
Current Limit
ILIM
VIN = 3.3V, VOUT = 3.0V, RSET = 690
Min. Current Limit
ILIM(min.)
VIN = 3.3V, VOUT = 3.0V
150
Shutdown Threshold
140
Return from Shutdown
130
Hysteresis
10
Reverse Breakdown Voltage
9
V
Protections
Thermal Shutdown
Under Voltage Lockout
VUVLO
VIN Increasing
600
1.55
Under Voltage Lockout Hysteresis
800
1.65
1000
mA
mA
°C
1.75
V
50
mV
Dynamic
Delay On Time
tdON
RL=500 , CL=0.1 F
20
s
VOUT Rise Time
tR
RL=500 , CL=0.1 F
20
s
Turn On Time
tON
RL=500 , CL=0.1 F
40
s
Delay Off Time
tdOFF
RL=500 , CL=0.1 F
15
s
VOUT Fall Time
tF
RL=500 , CL=0.1 F
110
s
Turn Off Time
tOFF
RL=500 , CL=0.1 F
125
s
Over Current Blanking Time
tBLANK
FPF2193, FPF2194
15
30
60
Auto-Restart Time
tRSTRT
FPF2193
225
450
900
Short Circuit Response Time
FPF2193/4/5 Rev. F
FPF2194, FPF2195
NA
ms
ms
VIN = VOUT = 3.3V. Moderate
Over-Current Condition.
5
s
VIN = VOUT = 3.3V. Hard Short.
30
ns
4
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Electrical Characteristics Cont.
90
1.7
VON=VIN
SUPPLY CURRENT (uA)
85
SUPPLY CURRENT (uA)
V ON=0V
1.5
80
75
70
65
1.3
1.1
0.9
0.7
0.5
0.3
0.1
60
1
2
3
4
5
6
-0.1
7
1
2
3
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
1.3
100
1.2
V ON SUPPLY VOLTAGE ( V)
SUPPLY CURRENT (uA)
95
VIN=5.5V
85
80
VIN=3.3V
75
70
VIN=1.8V
65
60
6
7
1.1
1
0.9
0.8
0.7
0.6
55
50
-65
-40
-15
10
35
60
85
110
0.5
135
1
2
T J, JUNCTION TEMPERATURE (oC)
4
5
6
Figure 4. VON High Voltage vs. Input Voltage
900
1.1
850
ILIM, SUPPLY CURRENT (mA)
1.2
1
3
V IN , SUPPLY VOLT AGE (V)
Figure 3. Quiescent Current vs. Temperature
VON SUPPLY VOLTAGE ( V)
5
Figure 2. Quiescent Current vs. Input Voltage
105
90
4
SUPPLY VOLTAGE (V)
VONL(VIL)
0.9
0.8
0.7
0.6
800
750
700
650
600
550
0.5
1
2
3
4
5
500
6
0
V IN , SUPPLY VOLTAGE (V)
2
3
4
5
6
(V IN -V OUT ), SUPPLY VOLT AGE(V)
Figure 5. VON Low Voltage vs. Input Voltage
FPF2193/4/5 Rev. F
1
Figure 6. Current Limit vs. Output Voltage
5
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
850
1.7
1.6
1.5
1.4
800
NORMALIZED
RON(mOhms)
SUPPLY CURRENT (mA)
825
775
750
1.3
1.2
1.1
1
0.9
725
0.8
0.7
700
-65
-40
-15
10
35
60
85
110
1
135
2
3
Figure 7. Current Limit vs. Temperature
1000
TURN-ON/OFF TIMES (mS)
NORMALIZED
RON(mOhms)
VIN=1.8V
1.6
1.4
VIN=3.3V
1
0.8
6
Vin = 3.3V
3.3V
Load
0.5K
RL
==
0.5K
CL = 0.1uF
2
1.2
5
Figure 8. RON vs. VIN
2.2
1.8
4
VIN, SUPPLY VOLTAGE(V)
T J, JUNCTION TEMPERATURE (oC)
VIN=5.5V
TOFF
100
TON
0.6
0.4
-65
-40
-15
10
35
60
85
110
10
135
-65
-40
o
TJ, JUNCTION TEMPERATURE ( C)
35
60
85
110
135
110
135
Figure 10. TON / TOFF vs. Temperature
490
Vin = 3.3V
3.3V
Load
0.5K
RL
= =0.5K
CL = 0.1uF
470
T FALL
RESTART TIME (mS)
RISE / FALL TIMES (mS)
10
T J , JUNCTION TEMPERATURE (o C)
Figure 9. RON vs. Temperature
1000
-15
100
TRISE
10
450
430
410
390
1
-65
-40
-15
10
35
60
85
110
-65
135
-15
10
35
60
85
o
Figure 11. TRISE / TFALL vs. Temperature
FPF2193/4/5 Rev. F
-40
TJ, JUNCTION TEMPERATURE ( C)
o
T J, JUNCTION TEMPERATURE ( C)
Figure 12. TRESTART vs. Temperature
6
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
VIN
2V/DIV
BLANKING TIME (mS)
34
32
30
VON
2V/DIV
28
CIN = 10 F
COUT = 0.1 F
RL = 500
VIN = 3.3V
RSET = 788
IOUT
10mA/DIV
26
24
VOUT
2V/DIV
22
-65
-40
-15
10
35
60
85
110
135
T J, JUNCTION TEMPERATURE (oC)
200 s/DIV
Figure 13. TBLANK vs. Temperature
Figure 14. TON Response
CIN = 10 F
COUT = 0.1 F
RL = 500
VIN = 3.3V
RSET = 788
VIN
2V/DIV
VON
2V/DIV
CIN = 10 F
VIN = 3.3V
RSET = 788
VIN
2V/DIV
VOUT
2V/DIV
IOUT
10mA/DIV
IOUT
5A/DIV
VOUT
2V/DIV
20 s/DIV
200 s/DIV
Figure 15. TOFF Response
VIN = VON
2V/DIV
Figure 16. Short Circuit Response Time
(Output shorted to GND)
CIN = 10 F
VIN = VON = 3.3V
VOUT = GND
RSET = 788
VON
2V/DIV
VIN
2V/DIV
IOUT
500mA/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
50 s/DIV
200 s/DIV
Figure 17. Current Limit Response Time
(Switch is powered into a short)
FPF2193/4/5 Rev. F
CIN = 10 F
COUT = 0.1 F
VIN = 3.3V
RSET = 788
Figure 18. Current Limit Response Time
(Output is loaded by 2.2 , COUT = 0.1 F)
7
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
VON
2V/DIV
VON
2V/DIV
VIN
2V/DIV
VIN
2V/DIV
IOUT
500mA/DIV
IOUT
500mA/DIV
CIN = 10 F
COUT = 10 F
VIN = 3.3V
RSET = 788
VOUT
2V/DIV
VOUT
2V/DIV
200 s/DIV
200 s/DIV
Figure 20. Short Circuit Detection Function (Note 2)
Figure 19. Current Limit Response Time
(Output is loaded by 2.2 , COUT = 10 F)
VDRV3
2V/DIV
VDRV3
2V/DIV
VFLAGB
2V/DIV
IOUT
500mA/DIV
CIN = 10 F
COUT = 150 F
RL = 2.2
VIN = 3.3V
RSET2 = 368
VFLAGB
2V/DIV
TBLANK
VOUT
2V/DIV
CIN = 10 F
COUT = 0.1 F
IOUT
500mA/DIV
RL = 500
VIN = 3.3V
RSET = 788
VOUT
2V/DIV
10ms/DIV
TRESTART
CIN = 10 F
COUT = 0.1 F
RL = 500
VIN = 3.3V
RSET = 788
100ms/DIV
Figure 21. TBLANK Response
Figure 22. TRESTART Response
Note 2: When the output voltage is below VSCTH=1.1V, the current limit value is set at 62.5% of the current limit value.
Note 3: VDRV signal forces the device to go into overcurrent condition by loading.
FPF2193/4/5 Rev. F
8
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
keeps the power dissipation of the part below a certain limit
even at dead short conditions at 5.5V input voltage. The VSCTH
value is set to be 1V. At around 1.1V of output voltage the
switch is removed from short circuit current limiting mode and
the current limit is set to the current limit value.
The FPF2193, FPF2194, and FPF2195 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 55m P-channel MOSFET and a controller
capable of functioning over a wide input operating range of 1.85.5V. The controller protects against system malfunctions
through current limiting, under-voltage lockout and thermal
shutdown. The current limit is adjustable from 150mA to 1.5A
through the selection of an external resistor.
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 undervoltage lockout threshold will cause a controlled turn-on of the
switch which limits current over-shoots.
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 140°C overrides the ON control to turn off the switch.
In addition, excessive currents will cause the switch to turn off in
the FPF2193 and FPF2194. The FPF2193 has an Auto-Restart
feature which will automatically turn the switch on again after
450ms. For the FPF2194, the ON pin must be toggled to turn-on
the switch again. The FPF2195 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.
Thermal Shutdown
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.
Reverse Current Blocking
The entire FPF2193/95 family has a Reverse Current Blocking
feature that protects input source against current flow from
output to input. For a standard USB power design, this is an
important feature which protects the USB host from being
damaged due to reverse current flow on VBUS.
Fault Reporting
Upon the detection of an over-current, an input under-voltage,
or an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2193 and FPF2194, the
FLAGB goes LO at the end of the blanking time while FLAGB
goes LO immediately for the FPF2195. FLAGB remains LO
through the Auto-Restart Time for the FPF2195. For the
FPF2194, FLAGB is latched LO and ON must be toggled to
release it. With the FPF2195, 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.
When the load switch is OFF, no current flows from the output to
the input. If the switch is turned on and the output voltage is
greater than input voltage this feature is activated and turns off
the switch. This will prevent any current flow from output to
input. The reverse current blocking feature will be deactivated if
the VOUT - VIN is smaller than a typically 50mV threshold.
During this time some current (50mV/RON) will flow from the
output to input until input voltage become greater than output
voltage. The FLAGB operation is independent of the Reverse
Current blocking and will not report a fault condition if this
feature is activated.
Current Limiting
Timing Diagram
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 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. The FPF2193 and FPF2194
have a blanking time of 30ms, 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. The FPF2195 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.
90%
VON
90%
90%
VOUT
10%
10%
tdON
tR
tON
For preventing the switch from large power dissipation during
heavy load a short circuit detection feature is introduced. Short
circuit condition is detected by observing the output voltage.
The switch is put into short circuit current limiting mode if the
switch is loaded with a heavy load. When the output voltage
drops below VSCTH, short circuit detection threshold voltage,
the current limit value re-conditioned and short circuit current
limit value is decreased to 62.5% of the current limit value. This
FPF2193/4/5 Rev. F
10%
tdOFF
tF
tOFF
where:
tdON = Delay On Time
tR = VOUT Rise Time
tON = Turn On Time
tdOFF = Delay Off Time
tF = VOUT Fall Time
tOFF = Turn Off Time
9
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Description of Operation
Typical Application
RPullup = 100KΩ
LOAD
VOUT
VIN
FPF2193/4/5
FLAGB
Battery
1.8V-5.5V
OFF ON
ON
R2 = 499Ω
ISET
C2= 0.1 F
GND
C1= 0.1 F
Larger value of C1
is needed for long
supply traces.
RSET
Setting Current Limit
Input Capacitor
The FPF2193, FPF2194, and FPF2195 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,
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 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.
R SET = 551.6
--------------I LIM
(1)
Output Capacitor
RSET is in Ohms and that of ISET is Amps
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
FPF2193 and FPF2194, 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,
The table below can also be used to select RSET. A typical
application would be the 500mA current that is required by a
single USB port. Using the table below an appropriate selection
for the RSET resistor would be 788Ω. This will ensure that the
port load could draw 525mA, but not more than 875mA.
Likewise for a dual port system, an RSET of 368Ω would always
deliver at least 1125mA and never more than 1875mA.
Current Limit Various RSET Values
COUT(max) =
ILIM(max) x tBLANK(min)
(2)
VIN
RSET
[Ω]
Min. Current
Limit
[mA]
Typ. Current
Limit
[mA]
Max. Current
Limit
[mA]
368
1125
1500
1875
441
938
1250
1562
552
750
1000
1250
During normal operation as a switch, the power dissipated in the
part will depend upon the level at which the current limit is set.
The maximum allowed setting for the current limit is 1.5A and
this will result in a power dissipation of,
613
675
900
1125
P = (ILIM)2 x RON = (1.5)2 x 0.055 = 123.75mW
690
600
800
1000
788
525
700
875
919
450
600
750
1103
375
500
625
1226
338
450
563
1379
300
400
500
1576
263
350
438
1839
225
300
375
2206
188
250
313
2758
150
200
250
3677
113
150
188
FPF2193/4/5 Rev. F
Power Dissipation
(3)
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2193, 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,
P(max) =
=
10
tBLANK
tBLANK + tRSTRT
30
30 + 450
x VIN(max) x ILIM(max)
x 5.5 x 1.5 = 515.6mW
(4)
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Application Information
FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
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. When using the FPF2194,
attention must be given to the manual resetting of the part. 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 FPF2195, a short on the output will
cause the part to operate in a constant current state dissipating
a worst case power of,
P(max) = VIN(max) x ILIM(max)
(5)
= 5.5 × 1.5 = 8.25W
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.
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.
FPF2193/4/5 Rev. F
11
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
Dimensional Outline and Pad Layout
FPF2193/4/5 Rev. F
12
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Rev. I31
FPF2193/4/5 Rev. F
13
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FPF2193/4/5 Full Function Load Switch with Adjustable Current Limit
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