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FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
February 2009
FPF2223-FPF2225
Features
1.8 to 5.5V Input Voltage Range
Typical R
DS(ON)
= 140m
Typical R
DS(ON)
= 160m
Integrated Load Switch with Adjustable High Precision Current Limit
General Description
@ V
IN
= 5.5V
@ V
IN
= 3.3V
tm
250-625mA (min) Adjustable Current Limit
5% Current Limit Tolerance @ 625mA (min)
72
(typ) Output Discharge Resistance
ESD Protected, Above 8kV HBM and 2kV CDM
The FPF2223-FPF2225 are low R
DS(ON)
P-Channel MOSFET
load switches with high precision current limit value. The input
voltage range operates from 1.8V to 5.5V to fulfill today's Ultra
Portable Device's supply requirement. Switch control is by a
logic input (ON) capable of interfacing directly with low voltage
control signal. On-chip pull-down is available for output quick
discharge when switch is turned off.
For the FPF2224, 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 FPF2223 has an auto-restart
feature, which will turn the switch on again after 450mS if the
ON pin is still active. The FPF2224 do not have this auto-restart
feature so the switch will remain off until the ON pin is cycled.
For the FPF2225, 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 FPF2223 through FPF2225, the current limit is set
by an external resistor and the minimum current limit is 250mA.
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Notebook Computer
Pin 1
BOTTOM
TOP
Ordering Information
Part
FPF2223
FPF2224
FPF2225
Current Limit
(mA)
250-625
250-625
250-625
Current Limit
Blanking Time
(mS)
30
30
NA
Auto-Restart Time
(mS)
450
NA
NA
ON Pin
Activity
Active HI
Active HI
Active HI
©2008 Fairchild Semiconductor Corporation
FPF2223-FPF2225 Rev. C
1
www.fairchildsemi.com
FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
Typical Application Circuit
FPF2223/4/5
V
IN
V
OUT
FLAGB
OFF ON
ON
GND
I
SET
TO LOAD
Functional Block Diagram
V
IN
UVLO
THERMAL
SHUTDOWN
CONTROL
LOGIC
ON
CURRENT
LIMIT
V
OUT
I
SET
Output Discharge
FLAGB
GND
FPF2223-FPF2225 Rev. C
2
www.fairchildsemi.com
FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
Pin Configuration
ON 6
GND 5
FLAGB 4
1 I
SET
2 V
IN
3 V
OUT
MicroFET 2x2 6L
(BOTTOMVIEW)
Pin Description
Pin
1
2
3
4
5
6
Name
I
SET
V
IN
V
OUT
FLAGB
GND
ON
Function
Current Limit Set Input : A resistor from I
SET
to ground sets the current limit for the switch
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/OFF Control Input
Absolute Maximum Ratings
Parameter
V
IN
, V
OUT
, ON, FLAGB TO GND
I
SET
TO GND
Power Dissipation @ T
A
= 25°C
Operating and Storage Junction Temperature
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
HBM
MM
CDM
8000
400
2000
-65
Min.
-0.3
-0.3
Max.
6
0.3
1.2
125
86
Unit
V
V
W
°C
°
C/W
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
V
IN
Shutdown Current
Symbol
V
IN
Conditions
Min.
1.8
Typ.
Max.
5.5
Units
V
A
A
I
OUT
=0mA, V
IN
=V
ON
=1.8V, R
SET
=36K
I
Q
I
OUT
=0mA, V
IN
=V
ON
=3.3V, R
SET
=36K
I
OUT
=0mA, V
IN
=V
ON
=5.5V, R
SET
=36K
V
ON
=0V, V
IN
=5.5V, V
OUT
=short to GND
45
50
55
75
80
95
2.5
FPF2223-FPF2225 Rev. C
3
www.fairchildsemi.com
FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
Parameter
V
OUT
Shutdown Current
Symbol
Conditions
V
ON
=0V, V
OUT
=5.5V, V
IN
=short to GND
V
IN
=5.5V, I
OUT
=200mA, T
A
=25°C
Min.
Typ.
140
160
230
Max.
1
185
210
300
265
105
Units
A
On-Resistance
R
ON
V
IN
=3.3V, I
OUT
=200mA, T
A
=25°C
V
IN
=1.8V, I
OUT
=200mA, T
A
=25°C
V
IN
=3.3V, I
OUT
=200mA, T
A
=-40 to +80°
C
90
V
IN
=3.3V, V
ON
=0V, I
OUT
=10mA
m
Output Discharge Resistance
ON Input Logic High Voltage (ON)
ON Input Logic Low Voltage (OFF)
On Input Leakage
FLAGB Output Logic Low Voltage
FLAGB Output High Leakage
Current
Protections
Current Limit
I
LIM
V
IH
V
IL
72
0.8
1.4
V
IN
=1.8V
V
IN
=5.5V
V
IN
=1.8V
V
IN
=5.5V
V
ON
= V
IN
or GND
V
IN
=5.5V, I
SINK
=100 A
V
IN
=1.8V, I
SINK
=100 A
V
IN
=5.5V, Switch on
V
0.5
1.0
V
A
V
uA
-1
0.05
0.12
1
0.1
0.25
1
V
IN
=3.3V, V
OUT
= 3.0V, RSET=36K,
T
A
=25°C
Shutdown Threshold
Return from Shutdown
Hysteresis
627
660
140
130
10
693
mA
Thermal Shutdown
Under Voltage Shutdown
Under Voltage Shutdown Hysteresis
Dynamic
Turn On Time
Turn Off Time
V
OUT
Rise Time
V
OUT
Fall Time
Over Current Blanking Time
Auto-Restart Time
Current Limit Response Time
t
ON
t
OFF
t
RISE
t
FALL
t
BLANK
t
RSTRT
UVLO
°C
1.75
V
mV
S
nS
S
nS
60
900
mS
mS
S
V
IN
increasing
1.55
1.65
50
R
L
=500 , C
L
=0.001uF
R
L
=500 , C
L
=0.001uF
R
L
=500 , C
L
=0.001uF
R
L
=500 , C
L
=0.001uF
FPF2223, FPF2224
FPF2223
V
IN
= V
ON
= 3.3V. Over-Current
Condition: R
LOAD
=V
IN
/(I
LIM
x4)
15
225
70
600
40
100
30
450
5
FPF2223-FPF2225 Rev. C
4
www.fairchildsemi.com
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