FPF2123 ONSEMI | Alldatasheet
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©2008 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products tm October 2008 FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
Features
1.8 to 5.5V Input Voltage Range Controlled Turn-On 0.15-1.5A Adjustable Current Limit Undervoltage Lockout Thermal Shutdown <2A Shutdown Current Auto Restart Fast Current limit Response Time 3s to Moderate Over Currents Fault Blanking Reverse Current Blocking RoHS Compliant
Applications
The FPF2123, FPF2124, and FPF2125 are a series of l oad switches which provide full protection to systems a nd loads which may encounter large current conditions. These devices contain a 0.125 current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V. Th e current limit is settable using an external resistor. Inter nally, current is prevented from flowing when the MOSFET is off and t he output voltage is higher than the input voltage. Switch co ntrol is by a logic input (ON) capable of interfacing directly wi th low voltage control signals. Each part contains thermal shutdow n 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 parts operate in a constant-current mode to prohibit exce ssive currents from causing damage. For the FPF2123 and F PF2124 if the constant current condition still persists af ter 10ms, these parts will shut off the switch. The FPF2123 has an auto-restart feature which will turn the switch on again after 1 60ms if the ON pin is still active. The FPF2124 does not have this auto-restart feature so the switch will remain off after a current limit fault until the ON pin is cycled. The FPF2125 will not turn off after a current limit fault, but will rather remain in the constant current mode indefinitely. The minimum current limit is 150 mA. These parts are available in a space-saving 5 pin S OT23 package Typical Application Circuit
Ordering Information
[A] Current Limit Blanking Time [ms] Auto-Restart Time [ms] ON Pin Activity Top Mark FPF2123 0.15 - 1.5 5/10/20 80/160/320 Active HI 2123 FPF2124 0.15 - 1.5 5/10/20 NA Active HI 2124 FPF2125 0.15 - 1.5 Infinite NA Active HI 2125 OFF ON ON VIN GND FPF2123 - FPF2125 ISET VOUT TO LOAD
2 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Functional Block Diagram Pin Configuration Pin Description Pin Name Function
1 V IN Supply Input: Input to the power switch and the sup ply voltage for the IC
2 GND Ground
3 ON ON Control Input
4 ISET Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. 5 V OUT Switch Output: Output of the power switch UVLO THERMAL SHUTDOWN CURRENT LIMIT CONTROL LOGIC VIN ON VOUT ISET GND REVERSE CURRENT BLOCKING VIN GND ON ISET VOUT SOT23-5 3 4
3 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Absolute Maximum Ratings Recommended Operating Range
Electrical Characteristics
Parameter Min. Max. Unit VIN, VOUT, ON, ISET to GND -0.3 6 V Power Dissipation @ TA = 25° C (note 1) 667 mW Operating Temperature Range -40 125 ° C Storage Temperature -65 150 ° C Thermal Resistance, Junction to Ambient 150 ° C/W Electrostatic Discharge Protection HBM 4000 V MM 400 V Parameter Min. Max. Unit VIN 1.8 5.5 V Ambient Operating Temperature, TA -40 85 ° C Parameter Symbol Conditions Min. Typ. Max Units Basic Operation Operating Voltage V IN 1.8 5.5 V Quiescent Current I Q IOUT = 0mA V IN = 1.8 to 3.3V 75 A VIN = 3.3 to 5.5V 80 120 Shutdown Current I SHDN 2 A Reverse Block Leakage Current I BLOCK 1 A Latch-Off Current I LATCHOFF FPF2124 50 A On-Resistance R ON VIN = 3.3V, IOUT = 50mA, TA = 25° C 125 160 mVIN = 3.3V, IOUT = 50mA, TA = 85° C 150 200 VIN = 3.3V, IOUT = 50mA, TA = -40° C to +85° C 65 200 ON Input Logic High Voltage (ON) V IH VIN = 1.8V 0.75 V VIN = 5.5V 1.30 ON Input Logic Low Voltage V IL VIN = 1.8V 0.5 V VIN = 5.5V 1.0 ON Input Leakage V ON = VIN or GND 1 A Off Switch Leakage I SWOFF VON = 0V, VOUT = 0V 1 A Protections Current Limit I LIM VIN = 3.3V, VOUT = 3.0V, RSET=576 600 800 1000 mA Min. Current Limit I LIM(min.) VIN = 3.3V, VOUT = 3.0V 150 mA Thermal Shutdown Shutdown Threshold 140 ° CReturn from Shutdown 130 Hysteresis 10 Under Voltage Shutdown UVLO V IN Increasing 1.5 1.6 1.7 V Under Voltage Shutdown Hysteresis 50 mV
4 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Electrical Characteristics Cont. Note 1: Package power dissipation on 1square inch pad, 2 oz . copper board. Parameter Symbol Conditions Min. Typ. Max Units Dynamic Turn on time t ON RL = 500, CL = 0.1F 25 s Turn off time t OFF RL = 500, CL = 0.1F 70 s VOUT Rise Time t R RL = 500, CL = 0.1F 12 s VOUT Fall Time t F RL = 500, CL = 0.1F 200 s Over Current Blanking Time t BLANK FPF2123, FPF2124 5 10 20 ms Auto-Restart Time t RESTART FPF2123 80 160 320 ms FPF2124, FPF2125 NA Short Circuit Response Time VIN = VON = 3.3V. Moderate Over-Current Condition. 3 s VIN = VON = 3.3V. Hard Short. 20 s
9 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Description of Operation The FPF2123, FPF2124, and FPF2125 are current limit ed switches that protect systems and loads which can b e damaged or disrupted by the application of high currents. T he core of each 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 ma lfunctions through current limiting under-voltage lockout and thermal shutdown. The current limit is adjustable from 150m A to 1.5A through the selection of an external resistor. On/Off Control The ON pin controls the state of the switch. When O N is high, the switch is in the on state. Activating ON contin uously holds the switch in the on state so long as there is no f ault. For all versions, an under-voltage on V IN or a junction temperature in excess of 140° C overrides the ON control to turn off the switch. In addition, excessive currents will cause the switch to turn off in the FPF2123 and FPF2124. The FPF2123 has an Auto-Re start feature which will automatically turn the switch on again after 160ms. For the FPF2124, the ON pin must be toggled to turn-on the switch again. The FPF2125 does not turn off in response to an over current condition but instead remains opera ting in a constant current mode so long as ON is active and t he thermal shutdown or under-voltage lockout have not activate d. The ON pin control voltage and V IN pin have independent recommended operating ranges. The ON pin voltage ca n be driven by a voltage level higher than the input vol tage. Current Limiting The current limit ensures that the current through the switch doesn't exceed a maximum value while not limiting a t less than a minimum value. The current at which the parts wil l limit is adjustable through the selection of an external res istor connected to ISET. Information for selecting the resistor is found in the Application Info section. The FPF2123 and FP F2124 have a blanking time of 10ms, nominally, during whi ch the switch will act as a constant current source. At th e end of the blanking time, the switch will be turned-off. The F PF2125 has no current limit blanking period so it will remain in a constant current state until the ON pin is deactivated or th e thermal shutdown turns-off the switch. Under-Voltage Lockout The under-voltage lockout turns-off the switch if t he input voltage drops below the under-voltage lockout thres hold. With the ON pin active, the input voltage rising above t he under-voltage lockout threshold will cause a contro lled turn-on of the switch which limits current over-shoots. Thermal Shutdown The thermal shutdown protects the die from internal ly or externally generated excessive temperatures. During an over-temperature condition the switch is turned-off . The switch automatically turns-on again if the temperature of the die drops below the threshold temperature.
10 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
Application Information
5.5V C1=4.7F R SET C2=0.1F R2=110 5.5V MAX Setting Current Limit The FPF2123, FPF2124, and FPF2125 have a current li mit which is set with an external resistor connected be tween ISET and GND. This resistor is selected by using the fol lowing equation, R SET is in Ohms and that of ILIM is Amps The table below can also be used to select R SET. A typical application would be the 500mA current that is requ ired by a single USB port. Using the table below an appropria te selection for the R SET resistor would be 604 . This will ensure that the port load could draw 570mA, but not more than 950mA . Likewise for a dual port system, an R SET of 340 would always deliver at least 1120mA and never more than 1860mA. 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 capacitance or a short-circuit, a capacitor needs t o 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, C OUT, should be placed between V OUT and GND. This capacitor will prevent parasitic board in ductances from forcing VOUT below GND when the switch turns-off. For the FPF2123 and FPF2124, the total output capacitance n eeds to be kept below a maximum value, C OUT(max), to prevent the part from registering an over-current condition and turn ing-off the switch. The maximum output capacitance can be deter mined from the following formula, Current Limit Various RSET Values Power Dissipation During normal operation as a switch, the power dissipated in the part will depend upon the level at which the curren t limit is set. The maximum allowed setting for the current limit i s 1.5A and this will result in a typical power dissipation of, If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. Fo r the FPF2123 the power dissipation will scale by the Aut o-Restart Time, t RESTART, and the Over Current Blanking Time, t BLANK, so that the maximum power dissipated is, RSET 460 ILIM COUT max( ) ILIM min( ) tBLANK min( )× VIN RSET Min. Current Limit [mA] Typ. Current Limit [mA] Max. Current Limit [mA] 309 1120 1490 1860 340 1010 1350 1690 374 920 1230 1540 412 840 1120 1400 453 760 1010 1270 499 690 920 1150 549 630 840 1050 576 600 800 1000 604 570 760 950 732 470 630 790 887 390 520 650 1070 320 430 540 1300 260 350 440 1910 180 240 300 3090 110 150 190 P I LIM( )= RON× 1.5( ) 0.125×= 281mW= (4) P max( ) tBLANK max( )
11 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products This is more power than the package can dissipate, but the thermal shutdown of the part will activate to protect the part from damage due to excessive heating. When using the FPF 2124, attention must be given to the manual resetting of the part. Continuously resetting the part when a short on the output is present will cause the temperature of the part to i ncrease. The junction temperature will only be able to increase to the thermal shutdown threshold. Once this temperature has been reached, toggling ON will not turn-on the switch until the j unction temperature drops. For the FPF2125, a short on the output will cause the part to operate in a constant current sta te dissipating a worst case power of, This large amount of power will activate the therma l shutdown and the part will 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 capacito rs should be placed close to the device to minimize the effects that parasitic trace inductances may have on normal and short-circ uit operation. Using wide traces for V IN, VOUT and GND will help minimize parasitic electrical effects along with mi nimizing the case to ambient thermal impedance. 5.5 1.5×= 8.25W= P max( ) VIN· max( ) ILIM max( )×= (5)
12 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products Dimensional Outline and Pad Layout
13 www.fairchildsemi.com FPF2123-FPF2125 Rev. F FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products TRADEMARKS The following includes registered and unregistered trademarks and service marks, owned by Fairchild Se miconductor and/or its global subsidianries, and is not intended to be an exhaustive list of all such trademarks. * EZSWITCH™ and FlashWriter ® are trademarks of System General Corporation, used under license by Fairchild Semiconductor. DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NO T ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATI ON OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS. 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