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FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
November 2008
FPF2140/42/43/44/46/47
tm
Full Function Load Switch with Reverse Current Blocking
Features
1.8 to 5.5V Input Voltage Range
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
Fault Blanking
Reverse Current Blocking
Power Good Function
RoHS Compliant
General Description
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.
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.
These parts are available in a space-saving 6 pin 2X2 MLP
package.
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Hot Swap Supplies
Pin 1
BOTTOM
TOP
Ordering Information
Part
FPF2140
FPF2142
FPF2143
FPF2144
FPF2146
FPF2147
Current Limit
[mA]
200/300/400
200/300/400
200/300/400
400/600/800
400/600/800
400/600/800
Current Limit
Blanking Time
[ms]
15/30/60
15/30/60
0
15/30/60
15/30/60
0
Auto-Restart
Time
[ms]
225/450/900
NA
NA
225/450/900
NA
NA
ON Pin
Activity
Active HI
Active HI
Active HI
Active HI
Active HI
Active HI
©2008 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Typical Application Circuit
TO LOAD
V
OUT
FLAGB
GND
V
IN
PGOOD
OFF ON
ON
FPF2140/2/3/4/6/7
Functional Block Diagram
V
IN
UVLO
REVERSE
CURRENT
BLOCKING
ON
THERMAL
SHUTDOWN
CONTROL
LOGIC
CURRENT
LIMIT
V
OUT
FLAGB
PGOOD
GND
FPF2140/42/43/44/46/47 Rev. I
2
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Pin Configuration
ON
GND
FLAGB
6
5
4
7
1
2
3
PGOOD
V
IN
V
OUT
2X2 MicroFET-6
Pin Description
Pin
1
2
3
4
5, 7
6
Name
PGOOD
V
IN
V
OUT
FLAGB
GND
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
V
IN
, V
OUT
, ON, FLAGB, PGOOD to GND
Power Dissipation
Operating and Storage Junction Temperature
Thermal Resistance, Junction to Ambient
Jedec A114A
Jedec C101C
Electrostatic Discharge Protection
Jedec A115
IEC 61000-4-2
HBM
CDM
MM
Air Discharge
Contact Discharge
4000
2000
400
15000
8000
-65
Min
-0.3
Max
6
1.2
150
86
Unit
V
W
°C
°C/W
V
V
V
V
V
Recommended Operating Range
Parameter
V
IN
Ambient Operating Temperature, T
A
Min
1.8
-40
Max
5.5
85
Unit
V
°C
Electrical Characteristics
V
IN
= 1.8 to 5.5V, T
A
= -40 to +85°C unless otherwise noted. Typical values are at V
IN
= 3.3V and T
A
= 25°C.
Parameter
Basic Operation
Operating Voltage
Quiescent Current
Symbol
V
IN
Conditions
Min
1.8
Typ
Max Units
5.5
V
µA
120
V
IN
= 1.8V
I
Q
I
OUT
= 0mA
V
IN
= 3.3V
V
IN
= 5.5V
40
70
75
85
100
FPF2140/42/43/44/46/47 Rev. I
3
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Full Function Load Switch with Reverse Current Blocking
Electrical Characteristics Cont.
V
IN
= 1.8 to 5.5V, T
A
= -40 to +85°C unless otherwise noted. Typical values are at V
IN
= 3.3V and T
A
= 25°C
.
Parameter
On-Resistance
Symbol
R
ON
Conditions
V
IN
= 3.3V, I
OUT
= 200mA, T
A
= 25°C
V
IN
= 3.3V, I
OUT
= 200mA, T
A
= 85°C
V
IN
= 3.3V, I
OUT
= 200mA, T
A
= -40°C to +85°C
Min
Typ
120
135
Max Units
160
180
180
V
0.5
1
V
µA
µA
V
µA
%
%
0.1
0.2
1
V
V
µA
mΩ
65
0.8
1.4
ON Input Logic High Voltage
(ON)
ON Input Logic Low Voltage
ON Input Leakage
V
IN
Shutdown Current
FLAGB Output Logic Low
Voltage
FLAGB Output High Leakage
Current
PGOOD Threshold Voltage
PGOOD Threshold Voltage
Hysteresis
PGOOD Output Logic Low
Voltage
PGOOD Output High Leakage
Current
Reverse Block
V
OUT
Shutdown Current
Protections
V
IH
V
IL
V
IN
= 1.8V
V
IN
= 5.5V
V
IN
= 1.8V
V
IN
= 5.5V
V
ON
= V
IN
or GND
V
ON
= 0V, V
IN
= 5.5V,
V
OUT
= short to GND
V
IN
= 5V, I
SINK
= 10mA
V
IN
= 1.8V, I
SINK
= 10mA
V
IN
= V
ON
= 5V
V
IN
= 5.5V
-1
-2
0.05
0.12
1
2
0.2
0.3
1
90
1
V
IN
= 5V, I
SINK
= 10mA
V
IN
= 1.8V, I
SINK
= 10mA
V
IN
= V
ON
= 5V
0.05
0.12
V
ON
= 0V, V
OUT
= 5.5V,
V
IN
= short to GND
FPF2140, FPF2142,
FPF2143
FPF2144, FPF2146,
FPF2147
-2
2
µA
Current Limit
I
LIM
V
IN
= 3.3V,
V
OUT
= 3.0V
200
400
300
600
140
130
10
400
mA
800
Shutdown Threshold T
J
increasing
Thermal Shutdown
Under Voltage Lockout
Under Voltage Lockout
Hysteresis
Dynamic
Delay On Time
Delay Off Time
V
OUT
Rise Time
V
OUT
Fall Time
Over Current Blanking Time
Auto-Restart Time
Short Circuit Response Time
td
ON
td
OFF
t
R
t
F
t
BLANK
t
RSTRT
R
L
= 500Ω, C
L
= 0.1µF
R
L
= 500Ω, C
L
= 0.1µF
R
L
= 500Ω, C
L
= 0.1µF
R
L
= 500Ω, C
L
= 0.1µF
FPF2140, FPF2142, FPF2144, FPF2146
FPF2140, FPF2144
V
IN
= V
ON
= 3.3V. Moderate
Over-Current Condition
V
IN
= V
ON
= 3.3V. Hard Short
Note 1:
Package power dissipation on 1 square inch pad, 2 oz. copper board.
15
225
V
UVLO
Return from Shutdown
Hysteresis
V
IN
Increasing
1.55
°C
1.75
V
mV
1.65
50
25
45
10
110
30
450
5
30
60
900
µs
µs
µs
µs
ms
ms
µs
ns
FPF2140/42/43/44/46/47 Rev. I
4
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