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tm ?2007 fairchild semiconductor corporation 1 www.fairchildsemi.com february 2007 FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products FPF2500-fpf2506 intellimax? advanced load management products features ? 4.5 to 20v input voltage range ? controlled turn-on ? 0.4a, 0.8a and adjustable current limit option ? undervoltage lockout ? thermal shutdown ? <10ua shutdown current ? auto restart ? fault blanking applications ? pdas ? motor drivers ? cell phones ? digital cameras ? rohs compliant general description the FPF2500 through fpf2506 is a family of load switches which provide full protection to systems and loads which may encounter large current conditi ons. these devices contain a 0.23 ? current-limited n-channel mosfet which can operate over an input voltage range of 4.5-20v. switch control is by a logic input (on) capable of interfacing directly with low voltage control signals. each part contai ns thermal shutdown protection which shuts off the switch to prevent damage to the part when a continuous over-current condi tion 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 FPF2500, fpf2501, fpf2503 and fpf2505, if the constant current condition still persists after 5ms, these parts will shut off the switch and, for the fpf2503 and fpf2505, the fault signal pin (flagb) will be pulled low. the FPF2500, fpf2503, and fpf2505, have an auto-restart feature which will turn the switch on again after 640ms if the on pin is still active. the fpf2501 does not have this auto-restart feature so the sw itch will remain off until the on pin is cycled. for the fpf2502, fpf2504 and fpf2506, a current limit condition will imm ediately 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 FPF2500 through fpf2502, the minimum current limit is adjustable from 500ma to 2a. for the fpf2503 and fpf2504 the minimum current is internally fixed at 400ma while that for the fpf2505 and fpf2506 is internally fixed at 800ma. these parts are available in a space-saving 5 pin sot23 package. ordering information part current limit [a] current limit blanking time [ms] auto-restart time [ms] fault pin FPF2500 adjustable (0.5-2.0 +/-30%) 2.5/5/10 320/640/1280 no fpf2501 adjustable (0.5-2.0 +/-30%) 2.5/5/10 na no fpf2502 adjustable (0.5-2.0 +/-30%) 0 na no fpf2503 0.4/0.6/0.8 2.5/5/10 320/640/1280 yes fpf2504 0.4/0.6/0.8 0 na yes fpf2505 0.8/1.2/1.6 2.5/5/10 320/640/1280 yes fpf2506 0.8/1.2/1.6 0 na yes
2 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products typical application circuit functional block diagram off on on v in gnd fpf2503- fpf2506 flagb v out to load 5.5v max - off on on v in gnd FPF2500-fpf2502 iset v out to load 5.5v max 5.5v max uvlo thermal shutdown current limit control logic v in on v out i set gnd FPF2500, fpf2501, fpf2502 uvlo thermal shutdown current limit control logic v in on v out flagb gnd fpf2503, fpf2504 fpf2505, fpf2506
3 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products pin configuration pin description absolute maximum ratings recommended operating range electrical characteristics v in = 4.5 to 20v, t a = -40 to +85c unless otherwise noted. typical values are at v in = 12v and t a = 25c. pin name function 1 v out switch output: output of the power switch 2 gnd ground 3 flagb fault output (fpf2503-fpf2506): active lo , open drain output which indicates on over current supply under voltage or over temperature state. iset adjustable current limit setting resistor (FPF2500-fpf2502): an external resistor connected between this pin and ground sets the current limit value. 4 on on control input: 5 v in supply input: input to the power switch and the supply voltage for the ic parameter min. max. unit v in , v out , to gnd -0.3 20 v on, flagb, iset to gnd -0.3 5.5 v power dissipation @ t a =25c (note 1) 667 mw operating temperature range -40 125 c storage temperature -65 150 c thermal resistance, junction to ambient 150 c/w electrostatic dischar ge protection hbm 2000 v mm 200 v parameter min. max. unit v in 4.5 20 v ambient operating temperature, t a -40 85 c parameter symbol conditions min. typ. max. unit basic operation operating voltage v in 4.5 20 v quiescent current i q i out = 0ma, v in = 12v, von=5v 60 100 a shutdown current i shdn 1 a latch-off current i latchoff fpf2501 45 a on-resistance r on t a = 25c, i out = 50ma 230 320 m ? t a = -40 to +85c, i out = 50ma 300 v out gnd flagb/iset on v in sot23-5 1 2 34 5
4 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products electrical characteristics cont. v in = 4.5 to 20v, t a = -40 to +85c unless otherwise noted. typical values are at v in = 12v and t a = 25c . note 1: package power dissipation on 1square inch pad, 2 oz. copper board. parameter symbol conditions min. typ. max. unit on input logic high voltage v ih v in = 4.5v to 20v 0.9 v on input logic low voltage v il v in = 4.5v to 20v 0.4 v on input leakage v on = 5v or gnd -1 1 a off switch leakage i swoff v on = 0v, v out = 0v 0.01 a flagb output logic low voltage v in = 5v, i sink = 10ma 0.1 0.2 v flagb output high leakage current v in = 5v, switch on 1 a protections current limit i lim t a =25 c fpf2503 fpf2504 400 600 800 ma fpf2505 fpf2506 800 1200 1600 FPF2500 fpf2501 fpf2502 0.7x i nom 1.0x i nom 1.3x i nom thermal shutdown t j increasing 140 c t j decreasing 130 c under voltage shutdown uvlo v in increasing 3.75 3.85 4.00 v under voltage shutdown hysteresis 100 mv dynamic turn on time t on r l =500 ? , c l =1uf 1 ms turn off time t off r l =500 ? , c l =1uf 0.1 ms v out rise time t r r l =500 ? , c l =1uf 3 ms v out fall time t f r l =500 ? , c l =1uf 1.5 ms over current blanking time t blank FPF2500, fpf2501, fpf2503, fpf2505 2.5 5 10 ms auto-restart time t restart FPF2500, fpf2503, fpf2505 320 640 1280 ms short circuit response time v in = 12v, v on = 5v moderate overcurrent condition 3 s
5 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products typical characteristics figure 1. quiescent current vs. input voltage figure 2. quiescent current vs. temperature figure 3. i shutdown current vs. temperature figure 4. i switch-off current vs. temperature figure 5. v ih vs. v in figure 6. r (on) vs. temperature 40 45 50 55 60 65 70 75 80 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) supply current (ua) v in = 12v v in = 20v v in = 4.5v 50 55 60 65 70 75 80 4 6 8 101214161820 supply voltage (v) supply current (ua) v on = 5v 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 8.0 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) supply current (ua) i_shdn v in = 12v v in = 20v 0.016 0.02 0.024 0.028 0.032 0.036 -40 -15 10 35 60 85 t j , junction temperature ( o c) supply current (ua) v in = 20v v in = 12v i_swoff 0.50 0.55 0.60 0.65 0.70 0.75 0.80 4 6 8 10121416182 0 v in , input voltage (v) on threshold (v) 160 180 200 220 240 260 280 300 320 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) r on (mohms) v in = 12v
6 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products typical characteristics figure 7. current limit vs. output voltage figure 8. current limit vs. output voltage figure 9. current limit vs. temperature figure 10. current limit vs. temperature figure 11. t on /t off vs. temperature figure 12. t rise /t fall vs. temperature 0 200 400 600 800 1000 1200 1400 012345678910111 2 v in - v out (v) output current (ma) fpf2505 , 250 6 fpf2503 , 250 4 0 200 400 600 800 1000 1200 1400 012345678910111 2 v in - v out (v) output current (ma) FPF2500 , 2501 , 2502 r set = 20k 0 200 400 600 800 1000 1200 1400 1600 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) output current (ma) fpf2503 , 2504 fpf2505 , 2506 600 700 800 900 1000 1100 1200 1300 1400 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) output current (ma) FPF2500, 2501, 2502 1 10 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) turn-on/off times (ms) i load = 10ma v cc = 12v t (fall) t (rise) 0.01 0.1 1 10 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) delay times (ms) i load = 10ma v cc = 12v td (on) td (off)
7 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products typical characteristics figure 13. t blank vs. temperature figure 14. t restart vs. temperature figure 15. t blank response figure 16. t restart response (fpf2505) (switch is turned on to an overcurrent condition) figure 17. t on response figure 18. t off response 3 4 5 6 7 -40 -15 10 35 60 8 5 t j , junction temperature ( o c) flag-blanking time (ms) 500 600 700 800 -40 -15 10 35 60 85 t j , junction temperature ( o c) restart time (ms) v drv (note 2) 5v/div v out 10v/div i out 1a/div flagb 5v/div 5ms/div 100ms/div v in = 12v v in = 12v t restart v drv (note 2) 5v/div v out 10v/div i out 1a/div flagb 5v/div v on 5v/div i out 10ma/div v on 5v/div i out 10ma/div 2ms/div 2us/div v in =12v, c in =10uf r l =500 ? , c l =1uf v in =12v, c in =10uf r l =500 ? , c l =1uf
8 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products typical characteristics figure 19. short circuit response figure 20. current limit response (output is shorted to gnd) note 2: v drv signal forces the device to go into overcurrent condition. v in 10v/div i out 10a/div v out 10v/div v in 10v/div v on 5v/div i out 1a/div 20us/div 1ms/div c out =1uf, c in =10uf v on =5v v in =12v, c in =10uf r l =4.7 ? , c l =1uf
9 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products description of operation the FPF2500 - fpf2506 are current limited switches that protect systems and loads which can be damaged or disrupted by the application of high current s. the core of each device is a 0.23 ? n-channel mosfet and a controller capable of functioning over a wide input operating range of 4.5 v -20 v. the controller protects agains t system malfunctions through current limiting under-voltage lockout and thermal shutdown. the current limit for FPF2500, fpf2501 and fpf2502 is adjustable from 500 ma to 2 a through the selection of an external resistor. the fpf2503 and fpf2504 the minimum current is internally fixed at 400 ma while that for the fpf2505 and fpf2506 is internally fixed at 800ma. 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 holds the switch in the on state so long as there is no fault. for all versions, an under-voltage on v in or a junction temperature in excess of 140c overrides the on control to turn off the switch. in addition, excessive currents will cause the switch to turn off in the FPF2500, fpf2501, fpf2503 and fpf2505. the FPF2500, fpf2503 and fpf2505 have an auto-restart feature which will automatically turn the switch on again after 640ms. for the fpf2501, the on pin must be toggled to turn-on the switch again. the fpf2502, fpf2504 and fpf2506 does not turn off in response to an over current condition but instead remains operating in a constant current mode so long as on is active and the thermal shutdown or under-voltage lockout have not activated. current limiting the current limit ensures that the current through the switch doesn't exceed a maximum value wh ile not limiting at less than a minimum value. for the FPF2500, fpf2501 and fpf2502, the current at which the parts will limit is adjustable through the selection of an external resistor connected to i set . information for selecting the resistor is found in the application info section. for the fpf2503 and fpf2504 the minimum current is 400ma and the maximum current is 800ma and for the fpf2505- fpf2506 the minimum current is 800ma and the maximum current is 1600ma. the FPF2500, fpf2501, fpf2503 and fpf2505 have a blanking time of 5ms, 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. for fpf2503 and fpf2505, 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 fpf2502, fpf2504 and fpf2506 have no current limit blanking period so they will remain in a constant current state. for fpf2504 and fpf2506, immediately upon a current limi t condition flagb is activated. the fpf2502, fpf2504 and fpf2506 devices will remain in constant current state until the on pin is cycled or the thermal shutdown turns-off the switch. under-voltage lockout the under-voltage lockout turns-off the switch if the input voltage drops below the under-vol tage lockout threshold. with the on pin active, the input voltage rising above the under-voltage lockout threshold wi ll cause a controlled turn-on of the switch which limits current over-shoots. thermal shutdown the thermal shutdown protects the die from internally 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 FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products application information typical application setting current limit the FPF2500, fpf2501, and fpf2502 have a current limit which is set with an external resistor connected between i set and gnd. this resistor is se lected by using the following equation, r set is in ohms and i set is in amps the following table can also be used to select r set . a typical application would be the 0.500a current that is required by a single usb port. using the table below an appropriate selection for the r set resistor would be 12.4k ? . this will ensure that the port load could draw 0.525a, but not more than 0.875a. likewise for a dual port system, an r set of 34.8k ? would always deliver at least 1.050a and never more than 1.750a. 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 v in and gnd. a 0.1uf ceramic capacitor, c in , placed close to the pins is usually sufficient. higher values of c in can be used to further reduce the voltage drop. current limi t various r set values off on on v in gnd fpf2503-fpf2506 flagb v out 5.5v max battery 12v c1=10uf r1=100k ? c2=1uf r2=240 ? - 5.5v max off on on v in gnd FPF2500-fpf2502 iset v out battery 12v c1=10uf rset c2=1uf r2=240 ? 5.5v max r set 12500 i set e 0.485 i set () = r set [k ? ] min. current limit [a] typ. current limit [a] max. current limit [a] 7.87 0.375 0.500 0.625 10.0 0.450 0.600 0.750 12.4 0.525 0.700 0.875 14.7 0.600 0.800 1.000 17.4 0.675 0.900 1.125 20.5 0.750 1.000 1.250 23.2 0.825 1.100 1.375 26.7 0.900 1.200 1.500 30.9 0.975 1.300 1.625 34.8 1.050 1.400 1.750 39.0 1.125 1.500 1.875 43.2 1.200 1.600 2.000 48.7 1.275 1.700 2.125 53.6 1.350 1.800 2.250 29.0 1.425 1.900 2.375 64.9 1.500 2.000 2.500 (1)
11 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products output capacitor a 0.1uf capacitor c out, should be placed between v out and gnd. this capacitor will pr event parasitic board inductances from forcing v out below gnd when the switch turns-off. for the fpf2501, fpf2503 and fpf2505, the total output capacitance needs to be kept below a maximum value, c out(max) , to prevent the part from registering an over-current condition and turning off the switch. the maximum output capacitance can be determined from the following formula, power dissipation due to the wide input voltage range that the parts can accept and the high currents at which the current limit can be set, care must be taken to prevent excessiv e power dissipation in the part from interrupting the switching of power to a load. during normal operation as a switch, the power dissipated in the part will depend upon the level at which the current limit is set. for a 0.5a typical load, the power dissipated will typically be, this is well within the therma l capability of the package. the maximum allowed setting for the cu rrent limit is 2a and this will result in a power dissipation of typically, this is beyond the normal therma l capability of the package, but the thermal shutdown within the part will prevent damage by turning off the switch once the maximum junction temperature has been reached. if the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. for the FPF2500, fpf2503 and fpf2505 the power dissipation will scal e by the auto-restart time, t restart , and the over current blanking time, t blank , so that the maximum power dissipated is, 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. 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 t he switch until the junction temperature drops. for the fpf2502, fpf2504 and fpf2506, a short on the output will cause the part to operate in a constant current state dissipating a worst case power of, this large amount of power will activate the thermal 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 capacitors should be placed close to the device to mi nimize the effects that parasitic trace inductances may have on normal and short-circuit operation. using wide traces for v in , v out and gnd will help minimize parasitic electrical effects along with minimizing the case to ambient thermal impedance. (4) (5) (6) (3) pi lim () 2 r ds 0.5 () 2 0.23 58mw === pi lim () 2 r ds 2 () 2 0.23 920mw === pmax () t blank t restart t blank + -------------------------------------------------- v in max () i lim max () = 5 5640 + ------------------- 20 2.5 388mw = = pmax () v in max () i lim max () 20 2.5 50w === c out max () i lim min () t blank min () v in ------------------------------------------------------------------ = (2)
12 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products dimensional outlin e and pad layout
13 www.fairchildsemi.com FPF2500-fpf2506 rev. d4 FPF2500-fpf2506 intellimax? advanced load management products trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is author ized to use and is not intend ed to be an exhaustive list of all such trademarks. disclaimer fairchild semiconductor reserves the right to m ake changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any pr oduct or circuit described herein; neither does it convey any license under its patent rights, nor th e rights of others. these specifications do not expand the terms of fairchild?s worldwide terms a nd conditions, specifically the warranty therein, which covers these products. life support policy fairchild?s products are not author ized for use as critical componen ts in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, or (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms acex ? across the board. around the world.? activearray? bottomless? build it now? coolfet? crossvolt ? ctl? current transfer logic? dome? e 2 cmos? ecospark ? ensigna? fact quiet series? fact ? fast ? fastr ? fps? frfet ? globaloptoisolator? gto? hisec? i-lo ? implieddisconnect? intellimax? isoplanar? microcoupler? micropak? microwire? msx? msxpro? ocx? ocxpro? optologic ? optoplanar ? pacman? pop? power220 ? power247 ? poweredge? powersaver? powertrench ? programmable active droop? qfet ? qs? qt optoelectronics? quiet series? rapidconfigure? rapidconnect? scalarpump? smart start? spm ? superfet? supersot?-3 supersot?-6 supersot?-8 tcm? the power franchise ? ? tinyboost? tinybuck? tinylogic? tinyopto? tinypower? tinywire? trutranslation? serdes? uhc ? unifet? vcx? wire? datasheet identification product status definition advance information formative or in design this dat asheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production this datasheet contai ns preliminary data, and supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. no identification needed full production this datasheet co ntains final specificati ons. fairchild semiconductor reserves the right to make changes at any time without notice in order to improve design. obsolete not in production this datasheet contai ns specifications on a product that has been discontinued by fairchild semicondu ctor. the datasheet is printed for reference information only. rev. i23

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