FPF2125;FPF2124;FPF2123;中文规格书,Datasheet资料

General DescriptionThe FPF2123, FPF2124, and FPF2125 are a series of loadswitches which provide full protection to systems and loadswhich may encounter large current conditions. These devicescontain a 0.125󰈍 current-limited P-channel MOSFET which canoperate over an input voltage range of 1.8-5.5V. The currentlimit is settable using an external resistor. Internally, current isprevented from flowing when the MOSFET is off and the outputvoltage is higher than the input voltage. Switch control is by alogic input (ON) capable of interfacing directly with low voltagecontrol signals. Each part contains thermal shutdown protectionwhich shuts off the switch to prevent damage to the part when acontinuous over-current condition causes excessive heating.When the switch current reaches the current limit, the partsoperate in a constant-current mode to prohibit excessivecurrents from causing damage. For the FPF2123 and FPF2124if the constant current condition still persists after 10ms, theseparts will shut off the switch. The FPF2123 has an auto-restartfeature which will turn the switch on again after 160ms if the ONpin is still active. The FPF2124 does not have this auto-restartfeature so the switch will remain off after a current limit fault untilthe ON pin is cycled. The FPF2125 will not turn off after acurrent limit fault, but will rather remain in the constant currentmode indefinitely. The minimum current limit is 150mA.These parts are available in a space-saving 5 pin SOT23packageApplications 󰂄PDAs󰂄Cell Phones󰂄GPS Devices󰂄MP3 Players󰂄Digital Cameras󰂄Peripheral Ports󰂄Hot Swap SuppliesTypical Application Circuit TO LOADVINVOUTFPF2123 - FPF2125OFFONONGNDISETOrdering InformationPartFPF2123FPF2124FPF2125Current Limit [A]0.15 - 1.50.15 - 1.50.15 - 1.5Current Limit Blanking Time [ms]5/10/205/10/20InfiniteAuto-Restart Time [ms]80/160/320NANAON Pin ActivityActive HIActive HIActive HITop Mark212321242125©2008 Fairchild Semiconductor CorporationFPF2123-FPF2125 Rev. F1www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsFunctional Block Diagram VINUVLO REVERSE CURRENT BLOCKINGCURRENT LIMITTHERMAL SHUTDOWNVOUTISETONCONTROL LOGICGNDPin ConfigurationVIN1GNDON23SOT23-ISET5VOUTPin Description Pin12345NameVINGNDONISETVOUTGroundON Control InputFunctionSupply Input: Input to the power switch and the supply voltage for the ICCurrent Limit Set Input: A resistor from ISET to ground sets the current limit for the switch.Switch Output: Output of the power switchFPF2123-FPF2125 Rev. F2www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsAbsolute Maximum Ratings ParameterVIN, VOUT, ON, ISET to GNDPower Dissipation @ TA = 25°C (note 1)Operating Temperature RangeStorage TemperatureThermal Resistance, Junction to AmbientElectrostatic Discharge ProtectionHBMMM4000400-40-65Min.-0.3Max.6667125150150UnitVmW°C°C°C/WVVRecommended Operating Range ParameterVINAmbient Operating Temperature, TAMin.1.8-40Max.5.585UnitV°CElectrical 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. ParameterBasic OperationOperating VoltageQuiescent CurrentShutdown CurrentReverse Block Leakage CurrentLatch-Off Current On-ResistanceSymbolVINIQISHDNIBLOCKILATCHOFFRONFPF2124ConditionsMin.1.8Typ.MaxUnits5.5V󰈝A󰈝A󰈝A󰈝A160200200V0.51.011V󰈝A󰈝Am󰈍IOUT = 0mA VIN = 1.8 to 3.3VVIN = 3.3 to 5.5V75801202150125150650.751.30VIN = 3.3V, IOUT = 50mA, TA = 25°CVIN = 3.3V, IOUT = 50mA, TA = 85°CVIN = 3.3V, IOUT = 50mA, TA = -40°C to +85°CON Input Logic High Voltage (ON)ON Input Logic Low Voltage ON Input LeakageOff Switch LeakageProtectionsCurrent LimitMin. Current LimitThermal ShutdownUnder Voltage ShutdownUnder Voltage Shutdown HysteresisUVLOILIMILIM(min.)VIN = 3.3V, VOUT = 3.0V, RSET=576󰈍VIN = 3.3V, VOUT = 3.0VShutdown ThresholdReturn from ShutdownHysteresisVIN Increasing1.5600ISWOFFVIHVILVIN = 1.8VVIN = 5.5VVIN = 1.8VVIN = 5.5VVON = VIN or GNDVON = 0V, VOUT = 0V800150140130101.6501000mAmA°C1.7VmVFPF2123-FPF2125 Rev. F3www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsElectrical Characteristics Cont.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.ParameterDynamicTurn on timeTurn off timeVOUT Rise TimeVOUT Fall TimeOver Current Blanking TimeAuto-Restart TimeSymboltONtOFFtRtFtBLANKtRESTARTConditionsRL = 500󰈍, CL = 0.1󰈝FRL = 500󰈍, CL = 0.1󰈝FRL = 500󰈍, CL = 0.1󰈝FRL = 500󰈍, CL = 0.1󰈝FFPF2123, FPF2124FPF2123FPF2124, FPF2125VIN = VON = 3.3V. Moderate Over-Current Condition.VIN = VON = 3.3V. Hard Short.Min.Typ.257012200MaxUnits󰈝s󰈝s󰈝s󰈝s20320msms󰈝s󰈝s58010160NA320Short Circuit Response TimeNote 1: Package power dissipation on 1square inch pad, 2 oz. copper board.FPF2123-FPF2125 Rev. F4www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsTypical Characteristics76VON = VIN74SUPPLY CURRENT (uA)72706866621.522.533.4.555.56SUPPLY VOLTAGE (V)45-40-1510356085TJ, JUNCTION TEMPERATURE (oC)SUPPLY CURRENT (uA)859575VIN = 5.5VVIN = 3.3VVIN = 1.8V6555 Figure 1. Quiescent Current vs. Input Voltage Figure 2. Quiescent Current vs. Temperature24002100SUPPLY CURRENT (nA)1800150012009006003000-40-151035o500450VIN = 5.5VSUPPLY CURRENT (nA)400350300250200150100500VIN = 3.3VVIN = 5.5VVIN = 3.3V6085-40-151035o6085TJ, JUNCTION TEMPERATURE (C)TJ, JUNCTION TEMPERATURE (C) Figure 3. ISHUTDOWN Current vs. Temperature Figure 4. ISWITCH-OFF Current vs. Temperature0.210.18SUPPLY CURRENT (uA)SUPPLY CURRENT (uA)0.150.120.090.060.030.001.52.02.53.03..04.55.05.56.0SUPPLY VOLTAGE (V)1.41.21.00.80.60.4VIN = 3.3V0.20.0-40-151035oVIN = 5.5V6085TJ, JUNCTION TEMPERATURE (C) Figure 5. Reverse Current vs. VOUT Figure 6. Reverse Current vs. TemperatureFPF2123-FPF2125 Rev. F5www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsTypical Characteristics52.051.5SUPPLY CURRENT (uA)51.050.550.049.9.0-40-151035󰀀900VIN - VOUT = 0.3VRSET = 576󰀀OUTPUT CURRENT (mA)60858608207807407001.522.533.4.555.56TJ, JUNCTION TEMPERATURE (C)VIN, INPUT VOLTAGE (V) Figure 7. ILATCH-OFF Current vs. Temperature Figure 8. Current Limit vs. Input Voltage900RSET = 576(1800150012009006003000200OUTPUT CURRENT (mA)820780740700-40-151035o6085OUTPUT CURRENT (mA)8608001400200026003200TJ, JUNCTION TEMPERATURE (C)RSET (Ohms) Figure 9. Current Limit vs. Temperature Figure 10. Current Limit vs. Rest1.41.2ON THRESHOLD (V)1.00.80.60.40.20.0123456VIN, Input Voltage (V)RON (mOhms)170160150140130120110100123456VIN, Input Voltage (V) Figure 11. VIH vs. VIN Figure 12. RON vs. VINFPF2123-FPF2125 Rev. F6www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsTypical Characteristics200180100TURN-ON/OFF TIMES (uS)VIN = 1.8VTOFF160RON (mOhms)140120VIN = 3.3VVIN = 5.5V1008060-40-151035oVIN = 3.3VRL = 500 OhmsCOUT = 0.1uFTON106085-40-151035o6085TJ, JUNCTION TEMPERATURE (C)TJ, JUNCTION TEMPERATURE (C) Figure 13. R(ON) vs. Temperature Figure 14. TON/TOff vs. Temperature1000TFALL1413BLANKING TIME (mS)RISE / FALL TIMES (uS)10012111098-40TRISE10VIN = 3.3VRL = 500 OhmsCOUT = 0.1uF1-40-1510356085TJ, JUNCTION TEMPERATURE (oC)-151035o6085TJ, JUNCTION TEMPERATURE (C) Figure 15. TRISE/TFALL vs. Temperature Figure 16. TBLANK vs. Temperature200190RESTART TIME (mS)180170160150140130120-40-151035oVDRV2 2V/DIV VOUT 2V/DIVVIN = 3.3VRL = 2.2󰈍CIN = 10󰈝F COUT = 0.1󰈝F IOUT 400mA/DIV6085TJ, JUNCTION TEMPERATURE (C) Figure 17. TRESTART vs. Temperature Figure 18. TBLANK Response FPF2123-FPF2125 Rev. F7www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsTypical Characteristics VON 2V/DIVVIN = 3.3VRL = 500󰈍CIN = 10󰈝F COUT = 0.1󰈝FVDRV2 2V/DIV VOUT 2V/DIVVIN = 3.3VRL = 2.2󰈍CIN = 10󰈝F COUT = 0.1󰈝F IOUT 10mA/DIV IOUT 400mA/DIV Figure 19. TRESTART Response Figure 20. TON Response VON 2V/DIVVIN = 3.3VRL = 500󰈍CIN = 10󰈝F COUT = 0.1󰈝F VIN 2V/DIVCIN = 10󰈝F COUT = 0.1󰈝F IOUT 10mA/DIV IOUT 4A/DIV VOUT 2V/DIV Figure 21. TOFF Response Figure 22. Short Circuit Response (Output Shorted to GND) VIN=VON 2V/DIVCIN = 10󰈝F COUT = 0.1󰈝F VIN 2V/DIVRL = 2.2󰈍CIN = 10󰈝F COUT = 0.1󰈝F VON 2V/DIV IOUT 400mA/DIV IOUT 400mA/DIV Figure 23. Current Limit Response (Switch power up to hard short) Figure 24. Current Limit Response (Output Shorted to GND by 2.2󰈍, moderate short)Note 2: VDRV signal forces the device to go into overcurrent condition by loading a 2.2󰈍 resistor.FPF2123-FPF2125 Rev. F8www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsDescription of OperationThe FPF2123, FPF2124, and FPF2125 are current limitedswitches that protect systems and loads which can be damagedor disrupted by the application of high currents. The core ofeach device is a 0.125󰈍 P-channel MOSFET and a controllercapable of functioning over a wide input operating range of1.8-5.5V. The controller protects against system malfunctionsthrough current limiting under-voltage lockout and thermalshutdown. The current limit is adjustable from 150mA to 1.5Athrough the selection of an external resistor.Under-Voltage LockoutThe under-voltage lockout turns-off the switch if the inputvoltage drops below the under-voltage lockout threshold. Withthe ON pin active, the input voltage rising above theunder-voltage lockout threshold will cause a controlled turn-onof the switch which limits current over-shoots.Thermal ShutdownThe thermal shutdown protects the die from internally orexternally generated excessive temperatures. During anover-temperature condition the switch is turned-off. The switchautomatically turns-on again if the temperature of the die dropsbelow the threshold temperature.On/Off Control The ON pin controls the state of the switch. When ON is high,the switch is in the on state. Activating ON continuously holdsthe switch in the on state so long as there is no fault. For allversions, an under-voltage on VIN or a junction temperature inexcess of 140°C overrides the ON control to turn off the switch.In addition, excessive currents will cause the switch to turn off inthe FPF2123 and FPF2124. The FPF2123 has an Auto-Restartfeature which will automatically turn the switch on again after160ms. For the FPF2124, the ON pin must be toggled to turn-onthe switch again. The FPF2125 does not turn off in response toan over current condition but instead remains operating in aconstant current mode so long as ON is active and the thermalshutdown or under-voltage lockout have not activated.The ON pin control voltage and VIN pin have independentrecommended operating ranges. The ON pin voltage can bedriven by a voltage level higher than the input voltage.Current LimitingThe current limit ensures that the current through the switchdoesn't exceed a maximum value while not limiting at less thana minimum value. The current at which the parts will limit isadjustable through the selection of an external resistorconnected to ISET. Information for selecting the resistor is foundin the Application Info section. The FPF2123 and FPF2124have a blanking time of 10ms, nominally, during which theswitch will act as a constant current source. At the end of theblanking time, the switch will be turned-off. The FPF2125 hasno current limit blanking period so it will remain in a constantcurrent state until the ON pin is deactivated or the thermalshutdown turns-off the switch.FPF2123-FPF2125 Rev. F9www.fairchildsemi.comhttp://oneic.com/

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management ProductsApplication InformationTypical ApplicationVINVOUTFPF2123- FPF2125Battery 5.5VOFFONC1=4.7󰈝F5.5V MAXONGNDRSETISETC2=0.1󰈝FR2=110󰈍Setting Current LimitThe FPF2123, FPF2124, and FPF2125 have a current limitwhich is set with an external resistor connected between ISETand GND. This resistor is selected by using the followingequation,460RSET=---------ILIMCurrent Limit Various RSET ValuesRSET[󰈍]30934037441245349995766047328871070130019103090Min. Current Limit [mA]11201010920840760690630600570470390320260180110Typ. Current Limit [mA]14901350123011201010920840800760630520430350240150Max. Current Limit [mA]1860169010140012701150105010009507906500440300190 RSET is in Ohms and that of ILIM is AmpsThe table below can also be used to select RSET. A typicalapplication would be the 500mA current that is required by asingle USB port. Using the table below an appropriate selectionfor the RSET resistor would be 604󰈍. This will ensure that theport load could draw 570mA, but not more than 950mA.Likewise for a dual port system, an RSET of 340󰈍 would alwaysdeliver at least 1120mA and never more than 1860mA.Input Capacitor To limit the voltage drop on the input supply caused by transientin-rush currents when the switch turns-on into a discharged loadcapacitance or a short-circuit, a capacitor needs to be placedbetween VIN and GND. A 4.7󰈝F ceramic capacitor, CIN, must beplaced close to the VIN pin. A higher value of CIN can be used tofurther reduce the voltage drop experienced as the switch isturned on into a large capacitive load.A 0.1󰈝F capacitor, COUT, should be placed between VOUT andGND. This capacitor will prevent parasitic board inductancesfrom forcing VOUT below GND when the switch turns-off. For theFPF2123 and FPF2124, the total output capacitance needs tobe kept below a maximum value, COUT(max), to prevent the partfrom registering an over-current condition and turning-off theswitch. The maximum output capacitance can be determinedfrom the following formula,ILIM(min)×tBLANK(min)-------------------------------------------------------------COUT(max)=---VINOutput CapacitorDuring normal operation as a switch, the power dissipated in thepart will depend upon the level at which the current limit is set.The maximum allowed setting for the current limit is 1.5A andthis will result in a typical power dissipation of,P=(ILIM)×RON=(1.5)×0.125=281mW22Power DissipationIf the part goes into current limit the maximum power dissipationwill occur when the output is shorted to ground. For theFPF2123 the power dissipation will scale by the Auto-RestartTime, tRESTART, and the Over Current Blanking Time, tBLANK, sothat the maximum power dissipated is,tBLANK(max)------------------------------------------------------×VIN(max)×ILIM(max) (4)P(max)=--------------------------tRESTART(min)+tBLANK(max)20=-------------------×5.5×1.5=1.65W80+20FPF2123-FPF2125 Rev. F10www.fairchildsemi.comhttp://oneic.com/

分销商库存信息:

FAIRCHILDFPF2125

FPF2124

FPF2123