Document
FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
February 2009
FPF2223-FPF2225
Integrated Load Switch with Adjustable High Precision Current Limittm
Features
1.8 to 5.5V Input Voltage Range Typical RDS(ON) = 140m @ VIN = 5.5V Typical RDS(ON) = 160m @ VIN = 3.3V 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
Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Notebook Computer
General Description
The FPF2223-FPF2225 are low RDS(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 constantcurrent 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.
BOTTOM
Pin 1
TOP
Ordering Information
Part
FPF2223 FPF2224 FPF2225
Current Limit (mA)
250-625 250-625 250-625
©2008 Fairchild Semiconductor Corporation FPF2223-FPF2225 Rev. C
Current Limit Blanking Time
(mS)
30 30 NA
Auto-Restart Time (mS)
450 NA NA
1
ON Pin Activity
Active HI Active HI Active HI
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FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
Typical Application Circuit
OFF ON
FPF2223/4/5
VIN VOUT
FLAGB
ON ISET GND
TO LOAD
Functional Block Diagram
VIN UVLO
THERMAL SHUTDOWN
ON
CONTROL LOGIC
CURRENT LIMIT
Output Discharge
GND
VOUT ISET
FLAGB
FPF2223-FPF2225 Rev. C
2
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FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
Pin Configuration
ON 6
1 ISET
GND 5
2 VIN
FLAGB 4
3 VOUT
MicroFET 2x2 6L (BOTTOMVIEW)
Pin Description
Pin Name
1 ISET 2 VIN 3 VOUT
4 FLAGB
5 GND 6 ON
Function
Current Limit Set Input : A resistor from ISET 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
VIN, VOUT, ON, FLAGB TO GND ISET TO GND Power Dissipation @ TA = 25°C Operating and Storage Junction Temperature Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection
HBM MM CDM
Min.
-0.3 -0.3
-65
8000 400 2000
Max.
6 0.3 1.2 125 86
Unit
V V W °C °C/W V V V
Recommended Operating Range
Parameter
VIN Ambient Operating Temperature, TA
Min.
1.8 -40
Max.
5.5 85
Unit
V °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.
Basic Operation
Operating Voltage Quiescent Current VIN Shutdown Current
VIN 1.8 IOUT=0mA, VIN=VON=1.8V, RSET=36K
IQ IOUT=0mA, VIN=VON=3.3V, RSET=36K IOUT=0mA, VIN=VON=5.5V, RSET=36K VON=0V, VIN=5.5V, VOUT=short to GND
Typ.
45 50 55
Max. Units
5.5 V 75 80 A 95 2.5 A
FPF2223-FPF2225 Rev. C
3
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FPF2223-FPF2225 Integrated Load Switch with Adjustable High Precision Current Limit
Parameter
VOUT Shutdown Current
On-Resistance
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
Symbol
Conditions
RON
VIH VIL
VON=0V, VOUT=5.5V, VIN=short to GND VIN=5.5V, IOUT=200mA, TA=25°C VIN=3.3V, IOUT=200mA, TA=25°C VIN=1.8V, IOUT=200mA, TA=25°C VIN=3.3V, IOUT=200mA, TA=-40 to +80°C VIN=3.3V, VON=0V, IOUT=10mA VIN=1.8V VIN=5.5V VIN=1.8V VIN=5.5V VON = VIN or GND VIN=5.5V, ISINK=100 A VIN=1.8V, ISINK=100 A
VIN=5.5V, Switch on
Min.
90 0.8 1.4 -1
Typ.
140 160 230 72
0.05 0.12
Max.
1 185 210 300 265 105
Units
A
m
V
0.5 1.0 1 0.1 0.25
V A V
1 uA
Protections Current Limit
ILIM
Thermal Shutdown
Under Voltage Shutdown Under Voltage Shutdown Hysteresis Dynamic Turn On Time Turn Off Time VOUT Rise Time VOUT Fall Time Over Current Blanking Time Auto-Restart Time
UVLO
tON tOFF tRISE tFALL tBLANK tRSTRT
Current Limit Response Time
VIN.