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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
August 2008
FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Features
1.8 to 5.5V Input Voltage Range Controlled Turn-On 200mA and 400mA Current Limit Options Undervoltage Lockout Thermal Shutdown <2A Shutdown Current Fast Current limit Response Time 3s to Moderate Over Currents 20ns to Hard Shorts Reverse Current Blocking Fault Blanking RoHS Compliant
tm
General Description
The FPF2108-FPF2110 is a series of load switches which provides full protection to systems and loads which may encounter large current conditions. This devices contain a 0.125 current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V. Internally, reverse current blocking prevents current 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 FPF2108, if the constant current condition still persists after 10ms, the part will shut off the switch and pull the fault signal pin (FLAGB) low. The switch will remain off until the ON pin is cycled. For the FPF2109 and FPF2110, 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 FPF2109 while that for the FPF2108 and FPF2110 is 400mA. These parts are available in a space-saving 5 pin SOT23 package.
Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies
Typical Application Circuit
TO LOAD VIN VOUT
FPF2108 - FPF2110
OFF ON ON GND FLAGB
Ordering Information
Part
FPF2108 FPF2109 FPF2110
Current Limit [mA]
400 200 400
Current Limit Blanking Time [ms]
10 0 0
Auto-Restart Time [ms]
NA NA NA
ON Pin Activity
Active LO Active HI Active HI
Top Mark
2108 2109 2110
(c)2008 Fairchild Semiconductor Corporation
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FPF2108-FPF2110 Rev. E
FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Functional Block Diagram
VIN
UVLO
ON
CONTROL LOGIC
REVERSE CURRENT BLOCKING
CURRENT LIMIT THERMAL SHUTDOWN VOUT FLAGB
GND
Pin Configuration
VIN 1 GND ON 2 3 SOT23-5 4 FLAGB 5 VOUT
Pin Description
Pin
1 2 3 4 5
Name
VIN GND ON FLAGB VOUT Ground ON Control Input
Function
Supply Input: Input to the power switch and the supply voltage for the IC
Fault Output: Active LO, open drain output which indicates an over current supply, under voltage or over temperature state. Switch Output: Output of the power switch
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Absolute Maximum Ratings
Parameter
VIN, VOUT, ON, FLAGB to GND Power Dissipation @ TA = 25C (note 1) Operating Temperature Range Storage Temperature Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection HBM MM 4000 400 -40 -65
Min.
-0.3
Max.
6 667 125 150 150
Unit
V mW C C C/W 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 +85C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25C.
Parameter
Basic Operation Operating Voltage Quiescent Current Shutdown Current Reverse Block Leakage Current Latch-Off Current (note 2) On-Resistance
Symbol
VIN IQ ISHDN IBLOCK ILATCHOFF RON IOUT = 0mA Von active
Conditions
Min
1.8
Typ Max Units
5.5 95 110 200 2 1 V A A A A 160 200 200 V 0.5 1.0 1 1 0.1 0.15 0.2 0.3 1 V A A V A m
VIN = 1.8 to 3.3V VIN = 3.3 to 5.5V
VON = VIN, after an overcurrent fault VIN = 3.3V, IOUT = 50mA, TA = 25C VIN = 3.3V, IOUT = 50mA, TA = 85C VIN = 3.3V, IOUT = 50mA, TA = -40C to +85C 65 0.75 1.30 VIN = 1.8V VIN = 5.5V VIN = 1.8V VIN = 5.5V VON = VIN or GND VON = 0V, VOUT = 0V VIN = 5V, ISINK = 10mA VIN = 1.8V, ISINK = 10mA VIN = 5V, Switch on VIN = 3.3V, VOUT = 3.0V Shutdown Threshold Return from Shutdown Hysteresis FPF2109 FPF2108, FPF2110 200 400
50 125 150
ON Input Logic High Voltage ON Input Logic Low Voltage ON Input Leakage Off Switch Leakage FLAGB Output Logic Low Voltage FLAGB Output High Leakage Current Protections Current Limit
VIH VIL
ISWOFF
ILIM
300 600 140 130 10
400 800
mA
Thermal Shutdown Under Voltage Shutdown Under Voltage Shutdown Hysteresis UVLO
C 1.7 V mV
VIN Increasing
1.5
1.6 47
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Electrical Characteristics Cont.
VIN = 1.8 to 5.5V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25C.
Parameter
Dynamic Turn on time Turn off time VOUT Rise Time VOUT Fall Time Over Current Blanking Time Short Circuit Response Time
Symbol
tON tOFF tR tF tBLANK
Conditions
RL = 500, CL = 0.1F RL = 500, CL = 0.1F RL = 500, CL = 0.1F RL = 500, CL = 0.1F FPF2108 VIN = VON = 3.3V. Moderate Over-Current Condition. VIN = VON = 3.3V. Hard Short.
Min. Typ. Max Units
25 50 12 136 5 10 3 20 20 s s s s ms s ns
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board. Note 2: Applicable only to FPF2108. Latchoff current does not include current flowing into FLAGB.
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Typical Characteristics
120 VON = VIN 110 100 90 80 70 60 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 SUPPLY VOLTAGE (V)
SUPPLY CURRENT (uA)
SUPPLY CURRENT (uA)
150
130
110
VIN = 5.5V
VIN = 3.3V
90
70
VIN = 1.8V
50 -40
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE ( C)
Figure 1. Quiescent Current vs. Input Voltage
Figure 2. Quiescent Current vs. Temperature
2500
I_SHDN
SUPPLY CURRENT (nA)
2000
I_SWOFF
SUPPLY CURRENT (nA)
2000
VIN = 5.5V
1500
VIN = 5.5V
1500
1000
1000
500
VIN = 3.3V
500
VIN = 3.3V
0 -40
-15
10
35
60
85
0 -40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE (oC)
Figure 3. ISHUTDOWN Current vs. Temperature
Figure 4. ISWITCH-OFF Current vs. Temperature
0.20 0.18 SUPPLY CURRENT (uA)
SUPPLY CURRENT (uA)
1.4 1.2 1 VIN = 5.5V 0.8 0.6 0.4 VIN = 3.3V 0.2 0 -40
0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02 0.00 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V)
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 5. Reverse Current vs. VOUT
Figure 6. Reverse Current vs. Temperature
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
700 600 OUTPUT CURRENT (mA) 500 400 300 200 100 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3 VIN-VOUT (V)
OUTPUT CURRENT (mA)
FPF2108, FPF2110
700 600 500 400 300 200 100 -40
FPF2108, FPF2110
FPF2109
FPF2109
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 7. Current Limit vs. Output Voltage
Figure 8. Current Limit vs. Temperature
200 180
ON THRESHOLD (V)
1.4 1.2
FPF2109, FPF2110
160 RON (mOhms) 140
VIN = 1.8V VIN = 3.3V
1
FPF2108
0.8 0.6 0.4 0.2 0
120
VIN = 5.5V
100 80 60 -40
-15
10
35
60
85
1.5
2
2.5
3
3.5
4
4.5
5
5.5
TJ, JUNCTION TEMPERATURE (oC)
VIN, INPUT VOLTAGE (V)
Figure 9. R(ON) vs. Temperature
Figure 10. VIH vs. VIN
100
ILOAD = 10mA VCC = 3.3V
1000
ILOAD = 10mA VCC = 3.3V T(FALL)
TURN-ON/OFF TIMES (uS)
TD(OFF) T
OFF
TURN-ON/OFF TIMES (uS)
100
TON TD(ON)
T(RISE)
10
10 -40
-15
10
35
60
85
1 -40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE (oC)
Figure 11. TON/TOFF vs. Temperature
Figure 12. TRISE/TFALL vs. Temperature
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
12 FLAG-BLANKING TIME (mS) 11 10 9 8 7 6 5 4 -40
VDRV 2V/DIV VOUT 2V/DIV IOUT 200mA/DIV VFLAGB 2V/DIV
-15 10 35 60 85 TJ, JUNCTION TEMPERATURE (oC)
5mS/DIV Figure 14. TBLANK Response (VDRV signal forces the device to go into overcurrent condition.)
Figure 13. TBLANK vs. Temperature
RL = 500, CL = 0.1F Active High Devices VON 2V/DIV VON 2V/DIV
RL = 500, CL = 0.1F Active High Devices
IOUT 10mA/DIV
IOUT 10mA/DIV
100S/DIV Figure 15. TON Response
200nS/DIV Figure 16. TOFF Response
VIN 2V / DIV
CIN = 10F COUT = 0.1F Active High Devices
VIN = VON Active High Devices VIN/VON 2V/DIV
IOUT 5A/DIV VOUT 2V/DIV 20S/DIV Figure 17. Short Circuit Response Time (Output Shorted to GND) IOUT 200mA/DIV
50S/DIV Figure 18. Current Limit Response (Switch power up to hard short)
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
VIN 2V/DIV Active High Devices
VON 2V/DIV
IOUT 200mA/DIV 50S/DIV Figure 19. Current Limit Response Time (Output Shorted to GND by 10, moderate short)
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Description of Operation
The FPF2108-FPF2110 is a current limited switch that protects systems and loads which can be damaged or disrupted by the application of high currents. The core of the device is a 0.125 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.
Under-Voltage Lockout
The under-voltage lockout turns-off the switch if the input voltage drops below the under-voltage lockout threshold. With the ON pin active the input voltage rising above the under-voltage lockout threshold will cause a controlled turn on of the switch which limits current over-shoots.
Thermal Shutdown
The thermal shutdown protects the part from internally or externally generated excessive temperatures. During an overtemperature condition the FLAGB is activated and the switch is turned-off. The switch automatically turns-on again if the temperature of the die drops below the threshold temperature.
On/OffControl
The ON pin controls the state of the switch. Active HI and LO versions are available. Refer to the Ordering Information for details. Activating ON continuously holds the switch in the on state so long as there is no fault. For all versions, an under-voltage on VIN or a junction temperature in excess of 150C overrides the ON control to turn off the switch. For FPF2108, the ON pin must be toggled to turn on the switch again. The FPF2109 and FPF2110 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 under-voltage lockout have not activated. When the MOSFET is off, the body diode is disabled so no current can flow through it.
Fault Reporting
Upon the detection of an over-current, an input under-voltage, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. For the FPF2108, the FLAGB goes LO at the end of the blanking time while FLAGB goes LO immediately for the FPF2109 and FPF2110. For the FPF2108, FLAGB is latched LO and ON must be toggled to release it.With the FPF2109 and FPF2110, 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.
Current Limiting
The current limit ensures that the current through the switch doesn't exceed a maximum value while not limiting at less than a minimum value. For the FPF2109 the minimum current is 200mA and the maximum current is 400mA and for the FPF2108 and FPF2110 the minimum current is 400mA and the maximum current is 800mA. The FPF2108 has a blanking time of 10ms, 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 FPF2109 and FPF2110 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.
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Application Information
Typical Application
VIN Battery 1.8V-5.5V
VOUT
LOAD R1 = 100K R2 = 499 C2 = 0.1F
FPF2108 - FPF2110
OFF ON C1 = 4.7F ON GND FLAGB
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 4.7F ceramic capacitor, CIN, must be placed close to the VIN pin. A higher value of CIN can be used to further reduce the voltage drop experienced as the switch is turned on into a large capacitive load.
Output Capacitor
A 0.1F 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.
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
P = (ILIM) 2 RDS = (0.8) 2 0.125 = 80mW
most power and that will only typically be, When in current limit the maximum power dissipation will occur when the output is shorted to ground. A short on the output will cause the part to operate in a constant current state 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.
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.
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
Dimensional Outline and Pad Layout
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FPF2108-FPF2110 IntelliMAXTM Advanced Load Management Products
TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Semiconductor and/or its global subsidianries, and is not intended to be an exhaustive list of all such trademarks. Build it NowTM CorePLUSTM CorePOWERTM CROSSVOLTTM CTLTM Current Transfer LogicTM EcoSPARK(R) EfficentMaxTM EZSWITCHTM *
TM
Fairchild(R) Fairchild Semiconductor(R) FACT Quiet SeriesTM FACT(R) FAST(R) FastvCoreTM FlashWriter(R) *
FPSTM F-PFSTM FRFET(R) Global Power ResourceSM Green FPSTM Green FPSTM e-SeriesTM GTOTM IntelliMAXTM ISOPLANARTM MegaBuckTM MICROCOUPLERTM MicroFETTM MicroPakTM MillerDriveTM MotionMaxTM Motion-SPMTM OPTOLOGIC(R) OPTOPLANAR(R)
(R)
tm
PDP SPMTM Power-SPMTM PowerTrench(R) Programmable Active DroopTM QFET(R) QSTM Quiet SeriesTM RapidConfigureTM Saving our world, 1mW at a timeTM SmartMaxTM SMART STARTTM SPM(R) STEALTHTM SuperFETTM SuperSOTTM-3 SuperSOTTM-6 SuperSOTTM-8 SupreMOSTM SyncFETTM
(R)
The Power Franchise(R)
tm
TinyBoostTM TinyBuckTM TinyLogic(R) TINYOPTOTM TinyPowerTM TinyPWMTM TinyWireTM SerDesTM
UHC(R) Ultra FRFETTM UniFETTM VCXTM VisualMaxTM
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ANTI-COUNTERFEITING POLICY Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Farichild's Anti-Counterfeiting Policy is also stated on our external website, www.fairchildsemi.com, under Sales Support. Counterfeiting of semiconductor parts is a growing problem in the industry. All manufactures of semiconductor products are experiencing counterfeiting of their parts. Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation, substandard performance, failed application, and increased cost of production and manufacturing delays. Fairchild is taking strong measures to protect ourselves and our customers from the proliferation of counterfeit parts. Farichild strongly encourages customers to purchase Farichild parts either directly from Fairchild or from Authorized Fairchild Distributors who are listed by country on our web page cited above. Products customers buy either from fairchild directly or from Authorized Fairchild Distributors are genuine parts, have full traceability, meet Fairchild's quality standards for handing and storage and provide access to Farichild's full range of up-to-date technical and product information. Fairchild and our Authorized Distributors will stand behind all warranties and will appropriately address and warranty issues that may arise. Fairchild will not provide any warranty coverage or other assistance for parts bought from Unauthorized Sources. Farichild is committed to committed to combat this global problem and encourage our customers to do their part in stopping this practice by buying direct or from authorized distributors. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Preliminary No Identification Needed Obsolete Product Status Formative / In Design First Production Full Production Not In Production Definition Datasheet contains the design specifications for product development. Specifications may change in any manner without notice. Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve design. Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice to improve the design. Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor. The datasheet is for reference information only.
Rev. I35
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