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FPF2148 Full Function Load Switch
November 2008
FPF2148
Full Function Load Switch
Features
1.8 to 5.5V Input Voltage Range
Controlled Turn-On
200mA Current Limit Options
Undervoltage Lockout
Thermal Shutdown
<2µA Shutdown Current
Fast Current limit Response Time
5µs to Moderate Over Currents
30ns to Hard Shorts
Fault Blanking
Power Good Function
RoHS Compliant
tm
General Description
The FPF2148 is a load switch 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. Switch control is by a logic input (ONB)
capable of interfacing directly with low voltage control signals.
The 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 FPF2148, 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.
The part is 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
FPF2148
Current Limit
[mA]
200/300/400
Current Limit
Blanking Time
[ms]
0
Auto-Restart
Time
[ms]
NA
ONB Pin
Activity
Active LO
©2008 Fairchild Semiconductor Corporation
1
www.fairchildsemi.com
FPF2148 Rev. H
FPF2148 Full Function Load Switch
Typical Application Circuit
TO LOAD
V
OUT
V
IN
FPF2148
PGOOD
ON
OFF
ONB
GND
FLAGB
Functional Block Diagram
V
IN
UVLO
ONB
THERMAL
SHUTDOWN
CONTROL
LOGIC
REVERSE
CURRENT
BLOCKING
CURRENT
LIMIT
V
OUT
FLAGB
PGOOD
GND
FPF2148 Rev. H
2
www.fairchildsemi.com
FPF2148 Full Function Load Switch
Pin Configuration
ONB
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
ONB
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
, ONB, 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
FPF2148 Rev. H
3
www.fairchildsemi.com
FPF2148 Full Function Load Switch
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
ONB Input Logic High Voltage (ON)
ONB Input Logic Low Voltage
ONB 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
Current Limit
Thermal Shutdown
Under Voltage Lockout
Under Voltage Lockout Hysteresis
Dynamic
Delay On Time
Delay Off Time
V
OUT
Rise Time
V
OUT
Fall Time
Short Circuit Response Time
V
IH
V
IL
V
IN
= 1.8V
V
IN
= 5.5V
V
IN
= 1.8V
V
IN
= 5.5V
V
ONB
= V
IN
or GND
V
ONB
= 5.5V, V
OUT
= 5.5V,
V
IN
= short to GND
V
IN
= 5V, I
SINK
= 10mA
V
IN
= 1.8V, I
SINK
= 10mA
V
IN
= 5V, V
ONB
= 0V
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
= 5V, V
ONB
= 0V
0.05
0.12
V
ONB
= 5.5V, V
OUT
= 5.5V,
V
IN
= short to GND
I
LIM
V
IN
= 3.3V, V
OUT
= 3.0V
Shutdown Threshold T
J
increasing
Return from Shutdown
Hysteresis
V
UVLO
V
IN
Increasing
-2
2
µA
200
300
140
130
10
400
mA
°C
1.55
1.65
50
1.75
V
mV
µs
µs
µs
µs
µs
ns
td
ON
td
OFF
t
R
t
F
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
V
IN
= 5.5V, V
ONB
= GND. Moderate
Over-Current Condition
V
IN
= 5.5V, V
ONB
= GND. Hard Short
25
45
10
110
5
30
Note 1:
Package power dissipation on 1square inch pad, 2 oz. copper board.
FPF2148 Rev. H
4
www.fairchildsemi.com
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