Fairchild FPF2142 Full function load switch with reverse current blocking Datasheet

FPF2140/42/43/44/46/47
tm
Full Function Load Switch with Reverse Current Blocking
Features
General Description
„ 1.8 to 5.5V Input Voltage Range
The FPF2140/42/43/44/46/47 is a series of load switches which
provides full protection to systems and loads which may
encounter large current conditions. These devices contain a
0.12Ω 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
„ 200mA and 400mA Current Limit Options
„ Undervoltage Lockout
„ Thermal Shutdown
„ <2µA Shutdown Current
„ Auto Restart
„ Fast Current limit Response Time
„ 5µs to Moderate Over Currents
„ 30ns to Hard Shorts
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 FPF2140/42/44/46, if
the constant current condition still persists after 30ms, the part
will shut off the switch and pull the fault signal pin (FLAGB) low.
The FPF2140/44 have an auto-restart feature which will turn the
switch on again after 450ms if the ON pin is still active. The
FPF2142/46 do not have this auto-restart feature so the switch
will remain off until the ON pin is cycled. For the FPF2143/47, 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. The minimum
current limit is 200mA for the FPF2140/42/43 while that for the
FPF2144/46/47 is 400mA.
„ Fault Blanking
„ Reverse Current Blocking
„ Power Good Function
„ RoHS Compliant
Applications
„ PDAs
„ Cell Phones
„ GPS Devices
„ MP3 Players
„ Digital Cameras
„ Peripheral Ports
These parts are available in a space-saving 6 pin 2X2 MLP
package.
„ Hot Swap Supplies
Pin 1
TOP
BOTTOM
Ordering Information
Part
Current Limit
[mA]
Current Limit
Blanking Time
[ms]
Auto-Restart
Time
[ms]
ON Pin
Activity
FPF2140
200/300/400
15/30/60
225/450/900
Active HI
FPF2142
200/300/400
15/30/60
NA
Active HI
FPF2143
200/300/400
0
NA
Active HI
FPF2144
400/600/800
15/30/60
225/450/900
Active HI
FPF2146
400/600/800
15/30/60
NA
Active HI
FPF2147
400/600/800
0
NA
Active HI
©2007 Fairchild Semiconductor Corporation
FPF2140/42/43/44/46/47 Rev. D
1
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
October 2007
TO LOAD
VIN
VOUT
FPF2140/2/3/4/6/7
FLAGB
PGOOD
OFF ON
ON
GND
Functional Block Diagram
VIN
UVLO
REVERSE
CURRENT
BLOCKING
CONTROL
LOGIC
ON
THERMAL
SHUTDOWN
CURRENT
LIMIT
VOUT
FLAGB
PGOOD
GND
FPF2140/42/43/44/46/47 Rev. D
2
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Typical Application Circuit
ON
6
GND
5
FLAGB
4
7
1
PGOOD
2
VIN
3
VOUT
2X2 MicroFET-6
Pin Description
Pin
Name
1
PGOOD
2
VIN
3
VOUT
4
FLAGB
5, 7
GND
6
ON
Function
Power Good output: Open drain output which indicate that output voltage has reached
90% of input voltage
Supply Input: Input to the power switch and the supply voltage For the IC
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
Absolute Maximum Ratings
Parameter
Min
VIN, VOUT, ON, FLAGB, PGOOD to GND
-0.3
Max
Power Dissipation
Operating and Storage Junction Temperature
-65
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
Unit
6
V
1.2
W
150
°C
86
°C/W
HBM
4000
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
70
100
Basic Operation
Operating Voltage
1.8
VIN
VIN = 1.8V
Quiescent Current
On-Resistance
FPF2140/42/43/44/46/47 Rev. D
IQ
RON
IOUT = 0mA
40
VIN = 3.3V
75
VIN = 5.5V
85
120
TA = 25°C, IOUT = 200mA
120
160
TA = 85°C, IOUT = 200mA
135
3
µA
mΩ
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
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
Typ
Max
Units
V
VIN = 1.8V
0.5
VIN = 5.5V
1
V
ON Input Leakage
VON = VIN or GND
-1
1
µA
VIN Shutdown Current
VON = 0V, VIN = 5.5V,
VOUT = short to GND
-2
2
µA
FLAGB Output Logic Low Voltage
VIN = 5V, ISINK = 10mA
0.05
0.2
VIN = 1.8V, ISINK = 10mA
0.12
0.3
FLAGB Output High Leakage Current
VIN = VON = 5V
PGOOD Threshold Voltage
VIN = 5.5V
1
PGOOD Threshold Voltage
Hysteresis
PGOOD Output Logic Low Voltage
PGOOD Output High Leakage
Current
V
µA
90
%
1
%
VIN = 5V, ISINK = 10mA
0.05
0.1
V
VIN = 1.8V, ISINK = 10mA
0.12
0.2
V
1
µA
2
µA
VIN = VON = 5V
Reverse Block
VON = 0V, VOUT = 5.5V,
VIN = short to GND
VOUT Shutdown Current
-2
Protections
Current Limit
ILIM
Thermal Shutdown
VIN = 3.3V,
VOUT = 3.0V
FPF2140, FPF2142,
FPF2143
200
300
400
FPF2144, FPF2146,
FPF2147
400
600
800
mA
Shutdown Threshold TJ increasing
140
Return from Shutdown
130
Hysteresis
Under Voltage Lockout
VUVLO
°C
10
VIN Increasing
1.55
Under Voltage Lockout Hysteresis
1.65
1.75
V
50
mV
Dynamic
Turn on time
tDR
RL = 500Ω, CL = 0.1µF
25
µs
Turn off time
tDF
RL = 500Ω, CL = 0.1µF
45
µs
VOUT Rise Time
tR
RL = 500Ω, CL = 0.1µF
10
µs
VOUT Fall Time
tF
RL = 500Ω, CL = 0.1µF
110
µs
Over Current Blanking Time
tBLANK
FPF2140, FPF2142, FPF2144,
FPF2146
15
30
60
ms
Auto-Restart Time
tRSTRT
FPF2140, FPF2144
225
450
900
ms
Short Circuit Response Time
VIN = VON = 3.3V. Moderate
Over-Current Condition
5
µs
VIN = VON = 3.3V. Hard Short
30
ns
Note 1: Package power dissipation on 1 square inch pad, 2 oz. copper board.
FPF2140/42/43/44/46/47 Rev. D
4
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Electrical Characteristics Cont.
110
90
105
100
SUPPLY CURRENT (uA)
SUPPLY CURRENT (uA)
85
80
75
70
65
95
90
VIN = 5.5V
85
80
VIN = 3.3V
75
70
VIN = 1.8V
65
60
55
60
50
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
-40
-15
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
1.3
1.2
1.2
1.1
1.1
1
0.9
0.8
60
85
1
0.9
0.8
0.7
0.6
0.7
0.5
0.6
1.5
2
2.5
3
3.5
4
4.5
5
5.5
1.5
6
2
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Figure 4. VON Low Voltage vs. Input Voltage
Figure 3. VON High Voltage vs. Input Voltage
240
200
190
220
180
200
R(ON) (mOhms)
170
R(ON) (mOhms)
35
Figure 2. Quiescent Current vs. Temperature
VON LOW VOLTAGE (V)
VON HIGH VOLTAGE (V)
10
TJ, JUNCTION TEMPERATURE (°C)
160
150
140
130
120
160
140
VIN = 3.3V
120
110
100
100
80
90
VIN = 1.8V
180
VIN = 5.5V
60
80
1
2
3
4
5
-40
6
Figure 5. R(ON) vs. VIN
FPF2140/42/43/44/46/47 Rev. D
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (°C)
VIN, SUPPLY VOLTAGE (V)
Figure 6. R(ON) vs. Temperature
5
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Typical Characteristics
700
350
FPF2140 / 42 / 43
VIN = 5.5V
FPF2144 / 46 / 47
VIN = 5.5V
600
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
300
250
200
150
100
500
400
300
200
100
50
0
0
0
1
2
3
VIN - VOUT (V)
4
5
0
6
1
2
3
4
Figure 7. Current Limit vs. Output Voltage
6
Figure 8. Current
320
635
FPF2140 / 42 / 43
630
315
FPF2144 / 46 / 47
625
CURRENT LIMIT (mA)
CURRENT LIMIT (mA)
5
VIN - VOUT (V)
310
305
300
295
620
615
610
605
600
595
590
585
580
290
-65
-40
-15
10
35
60
85
110
575
135
-65
TJ, JUNCTION TEMPERATURE (°C)
35
60
85
110
135
1000
VIN = 3.3 V
RL = 500 Ohms
COUT = 0.1uF
VIN = 3.3 V
RL = 500 Ohms
TURN-ON/OFF TIMES (uS)
TURN-ON/OFF TIMES (uS)
10
Figure 10. Current Limit vs. Temperature
TDF
TDR
10
-40
-15
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Current Limit vs. Temperature
100
-40
TF
100
TR
10
1
-15
10
35
TJ, JUNCTION TEMPERATURE (°C)
60
-40
85
10
35
60
85
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. TDR / TDF vs. Temperature
FPF2140/42/43/44/46/47 Rev. D
-15
Figure 12. TRISE / TFALL vs. Temperature
6
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Typical Characteristics
33
500
495
32.5
RESTART TIME (mS)
BLANK TIME (mS)
490
32
31.5
31
30.5
485
480
475
470
465
460
30
455
450
29.5
-40
-15
10
35
TJ, JUNCTION TEMPERATURE (°C)
60
-40
85
-15
Figure 13. TBLANK vs. Temperature
35
60
85
Figure 14. TRESTART vs. Temperature
CIN = 10µF
COUT = 0.1µF
RL = 500Ω
VIN = 3.3V
VON
2V/DIV
10
TJ, JUNCTION TEMPERATURE (°C)
CIN = 10µF
COUT = 0.1µF
RL = 500Ω
VIN = 3.3V
VON
2V/DIV
IOUT
10mA/DIV
IOUT
10mA/DIV
VOUT
2V/DIV
100µs/DIV
500ns/DIV
Figure 15. TDR Response
Figure 16. TDF Response
VIN
2V/DIV
VIN = VON
2V/DIV
CIN = 10µF
VIN = 3.3V
IOUT
5A/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
CIN = 10µF
VIN = VON = 3.3V
VOUT = GND
20µs/DIV
50µs/DIV
Figure 17. Short Circuit Response Time
(Output shorted to GND)
FPF2140/42/43/44/46/47 Rev. D
Figure 18. Current Limit Response Time
(Switch is powered into a short)
7
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Typical Characteristics
VIN
2V/DIV
VIN
2V/DIV
VON
2V/DIV
VON
2V/DIV
CIN = 10µF
COUT = 0.1µF
VIN = 3.3V
IOUT
500mA/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
VOUT
2V/DIV
50µs/DIV
50µs/DIV
Figure 20. Current Limit Response Time
(Output is loaded by 2.2Ω, COUT = 10µF)
Figure 19. Current Limit Response Time
(Output is loaded by 2.2Ω, COUT = 0.1µF)
VIN
5V/DIV
FPF2140/42/44/46
VDRV2
2V/DIV
CIN = 10µF
COUT = 0.1µF
RL = 500Ω
VIN = 5.5V
VON
5V/DIV
CIN = 10µF
COUT = 10µF
VIN = 3.3V
VON
2V/DIV
TBLANK
IOUT
500mA/DIV
VOUT
5V/DIV
CIN = 10µF
COUT = 0.1µF
RL = 500Ω
VIN = 3.3V
VOUT
2V/DIV
PGOOD
5V/DIV
20ms/DIV
10µs/DIV
Figure 22. TBLANK Response
Figure 21. PGOOD Response
VDRV2
2V/DIV
FPF2140/44
TRESTART
VON
2V/DIV
IOUT
500mA/DIV
CIN = 10µF
COUT = 0.1µF
RL = 500Ω
VIN = 3.3V
VOUT
2V/DIV
100ms/DIV
Figure 23. TRESTART Response
Note 2: VDRV signal forces the device to go into overcurrent condition by loading.
FPF2140/42/43/44/46/47 Rev. D
8
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Typical Characteristics
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
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 FPF2140/42/43/44/46/47 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
0.12Ω P-channel MOSFET and a controller capable of
functioning over a wide input operating range of 1.8-5.5V. The
controller protects against system malfunctions through current
limiting, undervoltage lockout and thermal shutdown. The
current limit is preset for either 200mA or 400mA.
On/Off Control
The ON pin controls the state of the switch. Activating ON
continuously holds the switch in the on state so long as there is
no undervoltage on VIN or a junction temperature in excess of
140°C. ON is active HI and has a low threshold making it
capable of interfacing with low voltage signals. In addition,
excessive currents will cause the switch to turn off for FPF2140/
42 and FPF2144/46. The FPF2140/44 have an Auto-Restart
feature which will automatically turn the switch on again after
450ms. For the FPF2142/46, the ON pin must be toggled to
turn-on the switch again. With no auto-restart, the FPF2143/47
do not turn off in response to a over current condition but
instead remain operating in a constant current mode so long as
ON is active and the thermal shutdown or undervoltage lockout
have not activated.
Undervoltage Lockout
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.
Reverse Current Blocking
The entire FPF2140/47 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. The reverse
current blocking feature is active when the load switch is turned
off.
Fault Reporting
Upon the detection of an over-current, an input undervoltage, or
an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2140/42/44/46, the FLAGB
goes LO at the end of the blanking time while FLAGB goes LO
immediately for the FPF2143/47. FLAGB remains LO through
the Auto-Restart Time for the FPF2140/44. For the FPF2142/
46, FLAGB is latched LO and ON must be toggled to release it.
With the FPF2143/47, 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.
If ON pin is LO and output voltage become greater than input
voltage, no current can flow from the output to the input . The
FLAGB operation is independent of the Reverse Current
blocking feature and will not report a fault condition if this
feature is 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.
Current Limiting
The current limit guarantees that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. For the FPF2140/42/43 the minimum current
is 200mA and the maximum current is 400mA and for the
FPF2144/46/47 the minimum current is 400mA and the
maximum current is 800mA. The FPF2140/42/44/46 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 and the FLAGB pin will
activate to indicate that current limiting has occurred. The
FPF2143/47 have no current limit blanking period so
immediately upon a current limit condition FLAGB is activated.
These parts will remain in a constant current state until the ON
pin is deactivated or the thermal shutdown turns-off the switch.
FPF2140/42/43/44/46/47 Rev. D
9
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Description of Operation
Typical Application
FPF2140/2/3/4/6/7
Typical value = 100KΩ
Battery
1.8V-5.5V
OFF ON
LOAD
VOUT
VIN
PGOOD
ON
R1 = 100KΩ
FLAGB
GND
R2 = 499Ω
C2 = 0.1µF
C1 = 0.1µF
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 0.1µF ceramic capacitor, CIN, placed
close to the pins is usually sufficient. Higher values of CIN can
be used to further reduce the voltage drop.
When using the FPF2142/46 attention must be given to the
manual resetting of the part. The junction temperature will only
be allowed 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
FPF2140/44, a short on the output will cause the part to operate
in a constant current state dissipating a worst case power as
calculated in (3) until the thermal shutdown activates. It will then
cycle in and out of thermal shutdown so long as the ON pin is
active and the short is present.
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
FPF2140/42/44/46, 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,
COUT(max) =
ILIM(max) x tBLANK(min)
VIN
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.
(1)
The middle pad (pin 7) should be connected to the GND plate
of PCB for improving thermal performance of the load switch.
An improper layout could result higher junction temperature and
triggering the thermal shutdown protection feature. This concern
applies specially with FPF2143 and FPF2147 where load switch
turns on into an overcurrent condition and switch supplies
constant current limit value. In this case power dissipation of the
switch (PD = (VIN - VOUT) x ILIM(max)) could exceed the
maximum absolute power dissipation of 1.2W.
Power Dissipation
During normal operation as a switch, the power dissipation is
small and has little effect on the operating temperature of the
part. The parts with the higher current limits will dissipate the
most power and that will only be,
P = (ILIM)2 x RDS = (0.8)2 x 0.12 = 76.8mW
(2)
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2140/44, 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) =
=
tBLANK
x VIN(max) x ILIM(max)
tBLANK + tRSTRT
30
x 5.5 x 0.8 = 275mW
30 + 450
FPF2140/42/43/44/46/47 Rev. D
(3)
10
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Application Information
Startup Power Sequence
VIN1
PGOOD
VIN1
FPF2140/2/ VOUT1
3/4/6/7
To Load
FLAGB
OFF ON
ON
GND
100KΩ
VIN2
PGOOD
VIN2
FPF2140/2/ VOUT2
3/4/6/7
To Load
FLAGB
ON
GND
100KΩ
TP
Power good function in sequential startup. No battery is loaded to the output
Power Good
Sequential Startup using Power Good
FPF214X family has a "Power Good" feature. PGOOD pin is an
open-drain MOSFET which asserts high when the output
voltage reaches 90% of the input voltage.
The power good pin can be connected to another load switch's
enable pin to implement sequential startup. PGOOD pin asserts
low when the load switch is OFF. This feature allows driving a
subsequent circuit. The above diagram illustrates power good
function in sequential startup. As the VOUT1 of the first load
switch starts to ramp to the 90% of its input voltage the second
switch remains in OFF state. Whereas the VOUT1 passes the
90% threshold, power good signal becomes active and asserts
high. This signal will turn on the second load switch and VOUT2
will start to increase. The total startup time may vary according
to the difference between supply voltages that are used in the
application.
PGOOD pin requires an external pull up resistor that is
connected to the output voltage when there is no battery in the
load side and the logic level of the subsequent controller
permits. This would give logic levels similar to a CMOS output
stage for PGOOD, while still keeping the option to tie the pull-up
to a different supply voltage. A typical value of 100KΩ is
recommended to be used as pull up resistor. The PGOOD pin
status is independent of the ON pin position. This mean that
PGOOD pin stays low when the load switch is OFF. If the Power
Good feature is not used in the application the pin can be
connected directly to GND.
FPF2140/42/43/44/46/47 Rev. D
11
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Application Notes
FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Dimensional Outline and Pad Layout
FPF2140/42/43/44/46/47 Rev. D
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Rev. I31
FPF2140/42/43/44/46/47 Rev. D
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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
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