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?2008 fairchild semiconductor corporation 1 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit tm october 2008 fpf2163/4/5 full function load switch with adjustable current limit 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 ? 5s to moderate over currents ? 30ns to hard shorts ? fault blanking ? reverse current blocking ? rohs compliant applications ? pdas ? cell phones ? gps devices ? mp3 players ? digital cameras ? peripheral ports ? hot swap supplies general description the fpf2163, fpf2164, and FPF2165 is a series of load switches which provides full protection to systems and loads which may encounter large current conditions. these devices contain a 0.12 ? current-limited p-channel mosfet which can operate over an input voltage range of 1.8-5.5v. internally, current is prevented 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 cont inuous over-current condition causes excessive heating. when the switch current reaches the current limit, the parts operate in a constant-current mode to prohibit excessive currents from causing damage. for the fpf2163 and fpf2164, 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 fpf2163 has an auto-restart feature which will turn the switch on again after 450ms if the on pin is still active. the fpf2164 does not have this auto-restart feature so the switch will remain off until the on pin is cycled. the FPF2165 will not turn off after a current limit fault, but will rather remain in the constant current mode indefinitely. the minimum current limit is 150ma. these parts are available in a space-saving 6 pin 2x2 mlp package. ordering information part current limit [ma] current limit blanking time [ms] auto-restart time [ms] on pin activity top mark fpf2163 150-1500 15/30/60 225/450/900 active hi 163 fpf2164 150-1500 15/30/60 na active hi 164 FPF2165 150-1500 0 na active hi 165 bottom top pin 1
2 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit typical application circuit functional block diagram off on on v in gnd fpf2163/4/5 iset v out to load flagb uvlo thermal shutdown current limit control logic v in on iset flagb gnd reverse current blocking v out
3 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit pin configuration pin description absolute maximum ratings recommended operating range electrical characteristics v in = 1.8 to 5.5v, t a = -40 to +85c unless otherwise noted. typical values are at v in = 3.3v and t a = 25c. pin name function 1 iset current limit set input: a resistor from iset to ground sets the current limit for the switch. 2v in supply input: input to the power switch and the supply voltage for the ic 3v out switch output: output of the power switch 4 flagb fault output: active lo, open drain output which indicates an over current supply under voltage or over temperature state. 5, 7 gnd ground 6 on on control input parameter min max unit v in , v out , on, flagb, iset to gnd -0.3 6 v power dissipation 1.2 w operating and storage junction temperature -65 150 c thermal resistance, junction to ambient 86 c/w electrostatic discharge protection jedec a114a hbm 4000 v jedec c101c cdm 2000 v jedec a115 mm 400 v iec 61000-4-2 air discharge 15000 v contact discharge 8000 v parameter min max unit v in 1.8 5.5 v ambient operating temperature, t a -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 i out = 0ma v in = 1.8v 63 100 a v in = 3.3v 68 v in = 5.5v 77 120 iset v in v out flagb on 2x2 microfet-6 6 5 43 2 1 gnd 7
4 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit electrical characteristics cont. v in = 1.8 to 5.5v, t a = -40 to +85c unless otherwise noted. typical values are at v in = 3.3v and t a = 25c . note 1: package power dissipation on 1square inch pad, 2 oz copper board. parameter symbol conditions min typ max units on-resistance r on v in = 3.3v, i out = 200ma, t a = 25c 120 160 m ? v in = 3.3v, i out = 200ma, t a = 85c 135 180 v in = 3.3v, i out = 200ma, t a = -40c to +85c 65 180 on input logic high voltage (on) v ih v in = 1.8v 0.8 v v in = 5.5v 1.4 on input logic low voltage v il v in = 1.8v 0.5 v v in = 5.5v 1 on input leakage v on = v in or gnd -1 1 a v in shutdown current v on = 0v, v in = 5.5v, v out = short to gnd -2 2 a flagb output logic low voltage v in = 5v, i sink = 10ma 0.05 0.2 v v in = 1.8v, i sink = 10ma 0.12 0.3 flagb output high leakage current v in = 5v, switch on 1 a reverse block v out shutdown current v on = 0v, v out = 5.5v, v in = short to gnd -2 2 a protections current limit i lim v in = 3.3v, v out = 3.0v, r set = 345 ? 600 800 1000 ma min. current limit i lim(min.) v in = 3.3v, v out = 3.0v 150 ma thermal shutdown shutdown threshold 140 c return from shutdown 130 hysteresis 10 under voltage shutdown uvlo v in increasing 1.55 1.65 1.75 v under voltage shutdown hysteresis 50 mv dynamic delay on time td on r l = 500 ? , c l = 0.1f 25 s delay off time td off r l = 500 ? , c l = 0.1f 45 s v out rise time t rise r l = 500 ? , c l = 0.1f 10 s v out fall time t fall r l = 500 ? , c l = 0.1f 110 s over current blanking time t blank fpf2163, fpf2164 15 30 60 ms auto-restart time t rstrt fpf2163 225 450 900 ms short circuit response time v in = v out = 3.3v. moderate over-current condition. 5s v in = v out = 3.3v. hard short. 30 ns
5 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit typical characteristics figure 1. quiescent current vs. input voltage figure 2. quiescent current vs. temperature figure 4. v on low voltage vs. input voltage figure 5. r on vs. v in figure 6. r on vs. temperature figure 3. v on high voltage vs. input voltage 50 55 60 65 70 75 80 85 90 95 100 -40 -15 10 35 60 85 t j , junction temperature (c) supply current (ua) v i n = 5.5 v v i n = 3.3 v v i n = 1.8v 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.522.533.544.555.56 supply voltage (v) v on high voltage (v) 66 68 70 72 74 76 78 11.522.533.544.555.56 supply voltage (v) supply current (ua) 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.522.533.544.555.56 supply voltage (v) v on low voltage (v) 80 90 100 110 120 130 140 150 160 170 180 190 200 12345 6 supply voltage ( v ) r on (mohms) 60 80 100 120 140 160 180 200 220 240 -40 -15 10 35 60 8 5 t j , junction temperature (c) r on (mohms) v in = 1.8v v in = 3.3v v in = 5.5v
6 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit typical characteristics 29.5 30 30.5 31 31.5 32 32.5 33 -40 -15 10 35 60 85 t j , junction temperature (c) blank time (ms) 450 455 460 465 470 475 480 485 490 495 500 -40 -15 10 35 60 85 t j , junction temperature (c) restart time (ms) 0 100 200 300 400 500 600 700 800 900 0123456 v in - v out (v) output current (ma) v in = 5.5v r set = 345 ohms 700 720 740 760 780 800 820 840 860 880 900 -65 -40 -15 10 35 60 85 110 135 t j , junction temperature (c) current limit (ma) figure 7. current limit vs. output voltage figure 8. current limit vs. temperature figure 9. td on / td off vs. temperature figure 10. t rise / t fall vs. temperature figure 11. t blank vs. temperature figure 12. t restart vs. temperature 10 100 -40 -15 10 35 60 85 t j , junction temperature (c) delay on/off time (us) td on td off v in = 3.3 v r l = 500 ohms c out = 0.1uf 1 10 100 1000 -40 -15 10 35 60 85 t j , junction temperature (c) rise / fall time (us) t r t f v in = 3.3 v r l = 500 ohm s
7 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit typical characteristics figure 16. td off response figure 17. short ci rcuit response time (output shorted to gnd) figure 18. current limit response time (switch is powered into a short) figure 15. td on response figure 13. t blank response figure 14. t restart response c in = 10f c out = 0.1f r l = 500 ? r set = 392 ? v in = 3.3v v drv 2 2v/div v out 2v/div i out 500ma/div v flagb 2v/div t blank v drv 2 2v/div v out 2v/div i out 500ma/div v flagb 2v/div t restart v out 2v/div c in = 10f c out = 0.1f v in = 3.3v r l = 500 ? c in = 10f c out = 0.1f v in = 3.3v r l = 500 ? v on 2v/div i out 10ma/div v in 2v/div v on 2v/div i out 10ma/div c in = 10f r set = 392 ? v out 2v/div v in 2v/div i out 5a/div c in = 10f v in = v on = 3.3v v out = gnd v in = v on 2v/div i out 500ma/div 20ms/div 100ms/div 100s/div 500ns/div 20s/div 20s/div c in = 10f c out = 0.1f r l = 500 ? r set = 392 ? v in = 3.3v
8 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit typical characteristics note 2: v drv signal forces the device to go in to overcurrent condition by loading. figure 19. current limit response time (output is loaded by 2.2 ? , c out = 0.1f) figure 20. current limit response time (output is loaded by 2.2 ? , c out = 10f) c in = 10f c out = 0.1f r set = 392 ? v in = 3.3v v in 2v/div v on 2v/div v out 2v/div i out 500ma/div c in = 10f c out = 10f r set = 392 ? v in = 3.3v v in 2v/div v on 2v/div v out 2v/div i out 500ma/div 50s/div 50s/div
9 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit description of operation the fpf2163, fpf2164, and FPF2165 are current limited switches that protect systems and loads which can be damaged or disrupted by the application of high currents. the core of each device is a 0.12 ? 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 adjustable from 150ma to 1.5a through the selection of an external resistor. 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 undervoltage 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 fpf2163 and fpf2164. the fpf2163 has an auto-restart feature which will automatically turn the switch on again after 450ms. for the fpf2164, the on pin must be toggled to turn-on the switch again. the FPF2165 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 undervoltage lockout have not activated. the on pin control voltage and v in pin have independent recommended operating ranges. the on pin voltage can be driven by a voltage level higher than the input voltage. fault reporting upon the detection of an over-current, an input undervoltage, or an over-temperature condition, the flagb signals the fault mode by activating lo. for the fpf2163 and fpf2164, the flagb goes lo at the end of t he blanking time while flagb goes lo immediately for the FPF2165. flagb remains lo through the auto-restart time for the FPF2165. for the fpf2164, flagb is latched lo and on must be toggled to release it. with the FPF2165, flag b 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. the current at which the parts will limit is adjustable through the selection of an external resistor connected to iset. information for selecting the resistor is found in the application info section. the fpf2163 and fpf2164 have a blanking time of 30ms, 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. the FPF2165 has no current limit blanking period so it will remain in a constant current state until the on pin is deactivated or the thermal shutdown turns-off the switch. for preventing the switch from large power dissipation during heavy load a short circuit detection feature is introduced. short circuit condition is detected by observing the output voltage. the switch is put into short circuit current limiting mode if the switch is loaded with a heavy load. when the output voltage drops below vscth, short circuit detection threshold voltage, the current limit value re-con ditioned and short circuit current limit value is decreased to 62.5% of the current limit value. this keeps the power dissipation of the part below a certain limit even at dead short conditions at 5.5v input voltage. the vscth value is set to be 1v. at around 1.1v of output voltage the switch is removed from short circuit current limiting mode and the current limit is set to the current limit value. undervoltage lockout the undervoltage lockout turns-off the switch if the input voltage drops below the undervoltage lockout threshold. with the on pin active the input voltage rising above the undervoltage lockout threshold will cause a c ontrolled turn-on of the switch which limits current over-shoots. reverse current blocking the entire fpf2163/65 family has a reverse current blocking feature that protects input source against current flow from output to input. for a standard usb power design, this is an important feature which protects the usb host from being damaged due to reverse current flow on v bus . the reverse current blocking feature is active when the load switch is turned off. if on pin is lo and output voltage become greater than input voltage, no current can flow from the output to the input . the flagb operation is independent of the reverse current blocking feature and will not r eport a fault condition if this feature is activated. thermal shutdown the thermal shutdown protects the die from internally or exter- nally generated excessive temperatures. during an over-tem- perature condition the flagb is activated and the switch is turned-off. the switch automatically turns-on again if tempera- ture of the die drops below the threshold temperature. timing diagram where: td on = delay on time t r =v out rise time t on = turn on time td off = delay off time t f =v out fall time t off = turn off time v on v out 10% 10% 10% 90% 90% 90% td on t r t on td off t f t off
10 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit application information typical application off on on v in gnd fpf2163/4/5 iset v out load battery 1.8v-5.5v c1 = 4.7f r set c2 = 0.1f r2 = 499 ? flagb setting current limit the fpf2163, fpf2164, and FPF2165 have a current limit which is set with an external resistor connected between iset and gnd. this resistor is selected by using the following equation, r set is in ohms and that of i lim is amps the table below can also be used to select r set . a typical application would be the 500ma current that is required by a single usb port. using the table below an appropriate selection for the r set resistor would be 394 ? . this will ensure that the port load could draw 525ma, but not more than 875ma. likewise for a dual port system, an r set of 185 ? would always deliver at least 1125ma and never more than 1875ma current limit various r set values input capacitor to limit the voltage drop on the input supply caused by transient in-rush currents when the switch is turned on into a discharged load capacitor or a short-circui t, a capacitor needs to be placed between v in and gnd. a 4.7f ceramic capacitor, c in , must be placed close to the v in pin. a higher value of c in can be used to further reduce the voltage drop experienced as the switch is turned on into a large capacitive load. output capacitor a 0.1uf capacitor c out , should be placed between v out and gnd. this capacitor will prev ent parasitic board inductances from forcing v out below gnd when the switch turns-off. for the fpf2163 and fpf2164, 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-of f the switch. the maximum output capacitance can be determined from the following formula, power dissipation during normal operation as a switch, the power dissipated in the part will depend upon the level at which the current limit is set. the maximum allowed setting for the current limit is 1.5a and this will result in a power dissipation of, if the part goes into current li mit the maximum power dissipation will occur when the output is shorted to ground. for the fpf2163, the power dissipation will scale by the auto-restart time, t rstrt , and the over current blanking time, t blank , so that the maximum power dissipated is, r set [ ? ] min. current limit [ma] typ. current limit [ma] max. current limit [ma] 185 1125 1500 1875 220 938 1250 1562 275 750 1000 1250 306 675 900 1125 345 600 800 1000 394 525 700 875 460 450 600 750 550 375 500 625 610 338 450 563 690 300 400 500 790 263 350 438 920 225 300 375 1100 188 250 313 1380 150 200 250 1830 113 150 188 (1) r set = 275.6 i lim (2) c out (max) = i lim (max) x t blank (min) v in (3) p = (i lim ) 2 x r ds = (1.5) 2 x 0.12 = 270mw (4) p(max) = t blank t blank + t rstrt x v in (max) x i lim (max) = 30 30 + 450 x 5.5 x 1.5 = 515.6mw
11 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit 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 fpf2164, attention must be given to the manual resetting of the part. 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 FPF2165, 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 minimize 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 el ectrical effects along with minimizing the case to ambient thermal impedance. the middle pad (pin 7) should be connected to the gnd plate of pcb for improving thermal performance of the load switch. an improper layout could result higher junction temperature and triggering the thermal shutdown pr otection feature. this concern applies when the switch is set at higher current limit value and an overcurrent condition occurs. in this case power dissipation of the switch (p d = (v in - v out ) x i lim (max)) could exceed the maximum absolute power dissipation of 1.2w. (5) p(max) = v in (max) x i lim (max) = 5.5 x 1.5 = 8.25w
12 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit dimensional outlin e and pad layout
13 www.fairchildsemi.com fpf2163/4/5 rev. i fpf2163/4/5 full functi on load switch with adju stable current limit trademarks the following includes registered and unregistered trademarks and serv ice marks, owned by fairchild semiconductor and/or its gl obal 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 with out 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 product or circuit described herein; neither does it convey an y license under its patent rights, nor the rights of others. these specifications do not expand the term s of fairchild?s worldwide terms and conditions, specifically the warranty therein, which covers these products. life support policy fairchild?s products are not authorized for use as critical co mponents in life support de vices 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, and (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 a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life s upport device or system, or to affect its safety or effectiveness. product status definitions definition of terms build it now? coreplus? corepower? crossvolt ? ctl? current transfer logic? ecospark ? efficentmax? ezswitch? * ? fairchild ? fairchild semiconductor ? fact quiet series? fact ? fast ? fastvcore? flashwriter ? * fps? f-pfs? frfet ? global power resource sm green fps? green fps? e-series? gto? intellimax? isoplanar? megabuck? microcoupler? microfet? micropak? millerdrive? motionmax? motion-spm? optologic ? optoplanar ? ? pdp spm? power-spm? powertrench ? powerxs? programmable active droop? qfet ? qs? quiet series? rapidconfigure? saving our world, 1mw/w/kw at a time? smartmax? smart start? spm ? stealth? superfet? supersot?-3 supersot?-6 supersot?-8 supremos? syncfet? ? the power franchise ? tinyboost? tinybuck? tinylogic ? tinyopto? tinypower? tinypwm? tinywire? serdes? uhc ? ultra frfet? unifet? vcx? visualmax? xs? ? datasheet identification product status definition advance information formative / in design datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make change s at any time without notice to improve design. no identification needed full production datasheet contains final specifications. fairch ild semiconductor reserves the right to make changes at any time without notice to improve the design. obsolete not in production datasheet contains specifications on a product t hat is discontinued by fairchild semiconductor. the datasheet is for reference information only. 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 t he industry. all manufactures of semiconductor products are expe riencing counterfeiting of their parts. customers who inadvertently purchase counterfeit parts expe rience many problems such as loss of brand reputation, substa ndard performance, failed application, and increased cost of production and manufacturing de lays. fairchild is taking strong measures to protect ourselve s and our customers from the proliferation of counterfeit parts. farichild strongly encourages customers to purchase farichild parts either directly from fa irchild or from authorized fairchild distributors who are listed by country on ou r web page cited above. products customers bu y either from fairchild directly or fr om authorized fairchild distributors are genuine parts, have full traceability, meet fa irchild?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 wi ll appropriately address and warranty issues that may arise. fairchild will not provide any warranty coverage or other assistance for parts bought from unau thorized 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. rev. i37

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