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?2007 fairchild semiconductor corporation 1 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking tm october 2007 fpf2140/42/43/44/46/47 full function load switch with reverse current blocking 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 ? auto restart ? fast current limit response time ? 5s to moderate over currents ? 30ns to hard shorts ? fault blanking ? reverse current blocking ? power good function ? rohs compliant applications ? pdas ? cell phones ? gps devices ? mp3 players ? digital cameras ? peripheral ports ? hot swap supplies general description the fpf2140/42/43/44/46/47 is a series of load switches which provides full protection to systems and loads which may encounter large current conditi ons. 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 cont ains 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 fpf2140/42/44/46, if the constant current condition st ill persists after 30ms, the part will shut off the switch and pull the fault signal pin (flagb) low. the fpf2140/44 have an auto-restart feature which will turn the switch on again after 450ms if the on pin is still active. the fpf2142/46 do not have this auto-restart feature so the switch will remain off until the on pi n is cycled. for the fpf2143/47, 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. the minimum current limit is 200ma for the fpf2140/42/43 while that for the FPF2144/46/47 is 400ma. 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 fpf2140 200/300/400 15/30/60 225/450/900 active hi fpf2142 200/300/400 15/30/60 na active hi fpf2143 200/300/400 0 na active hi FPF2144 400/600/800 15/30/60 225/450/900 active hi fpf2146 400/600/800 15/30/60 na active hi fpf2147 400/600/800 0 na active hi bottom top pin 1
2 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking typical application circuit functional block diagram off on on v in gnd fpf2140/2/3/4/6/7 flagb v out to load pgood uvlo thermal shutdown current limit control logic v in on pgood flagb gnd reverse current blocking v out
3 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking 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 = 2 5 c . pin name function 1 pgood power good output: open drain output which indicate that output voltage has reached 90% of input voltage 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 4flagb 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, pgood 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 hbm 4000 v mm 400 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 40 70 100 a v in = 3.3v 75 v in = 5.5v 85 120 on-resistance r on t a = 25c, i out = 200ma 120 160 m ? t a = 85c, i out = 200ma 135 pgood v in v out flagb on 2x2 microfet-6 6 5 43 2 1 gnd 7
4 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking 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 1 square inch pad, 2 oz. copper board. parameter symbol conditions min typ max units 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 = v on = 5v 1 a pgood threshold voltage v in = 5.5v 90 % pgood threshold voltage hysteresis 1% pgood output logic low voltage v in = 5v, i sink = 10ma 0.05 0.1 v v in = 1.8v, i sink = 10ma 0.12 0.2 v pgood output high leakage current v in = v on = 5v 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 fpf2140, fpf2142, fpf2143 200 300 400 ma FPF2144, fpf2146, fpf2147 400 600 800 thermal shutdown shutdown threshold t j increasing 140 c return from shutdown 130 hysteresis 10 under voltage lockout v uvlo v in increasing 1.55 1.65 1.75 v under voltage lockout hysteresis 50 mv dynamic turn on time t dr r l = 500 ? , c l = 0.1f 25 s turn off time t df r l = 500 ? , c l = 0.1f 45 s v out rise time t r r l = 500 ? , c l = 0.1f 10 s v out fall time t f r l = 500 ? , c l = 0.1f 110 s over current blanking time t blank fpf2140, fpf2142, FPF2144, fpf2146 15 30 60 ms auto-restart time t rstrt fpf2140, FPF2144 225 450 900 ms short circuit response time v in = v on = 3.3v. moderate over-current condition 5s v in = v on = 3.3v. hard short 30 ns
5 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking typical characteristics 60 65 70 75 80 85 90 11.522.533.544.555.56 supply voltage (v) supply current (ua) 50 55 60 65 70 75 80 85 90 95 100 105 110 -40 -15 10 35 60 85 t j , junction temperature (c) supply current (ua) v in = 5.5v v in = 3.3v v in = 1.8v 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 supply voltage (v) v on high voltage (v) 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 supply voltage (v) v on low voltage (v) 60 80 100 120 140 160 180 200 220 240 -40 -15 10 35 60 85 t j , junction temperature (c) r (on) (mohms) v in = 1.8v v in = 3.3v v in = 5.5v 80 90 100 110 120 130 140 150 160 170 180 190 200 123456 v in , supply voltage (v) r (on) (mohms) 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
6 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking typical characteristics 1 10 100 1000 -40 -15 10 35 60 85 t j , junction temperature (c) turn-on/off times (us) t r t f v in = 3.3 v r l = 500 ohms 0 50 100 150 200 250 300 350 0123456 v in - v out (v) output current (ma) fpf2140 / 42 / 43 v i n = 5.5v 0 100 200 300 400 500 600 700 0123456 v in - v out (v) output current (ma) FPF2144 / 46 / 47 v i n = 5.5v 290 295 300 305 310 315 320 -65-40-1510356085110135 t j , junction temperature (c) current limit (ma) fpf2140 / 42 / 43 figure 9. current limit vs. temperature figure 10. current limit vs. temperature figure 11. t dr / t df vs. temperature figure 12. t rise / t fall vs. temperature figure 7. current limit vs. output voltage figure 8. current 575 580 585 590 595 600 605 610 615 620 625 630 635 -65 -40 -15 10 35 60 85 110 135 t j , junction temperature (c) current limit (ma) FPF2144 / 46 / 47 10 100 -40 -15 10 35 60 85 t j , junction temperature (c) turn-on/off times (us) t dr t df v in = 3.3 v r l = 500 ohms c out = 0.1uf
7 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking 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) figure 17. short ci rcuit response time (output shorted to gnd) figure 18. current limit response time (switch is powered into a short) figure 13. t blank vs. temperature c in = 10f c out = 0.1f r l = 500 ? v in = 3.3v v on 2v/div v out 2v/div figure 16. t df response figure 15. t dr response i out 10ma/div figure 14. t restart vs. temperature v on 2v/div i out 10ma/div c in = 10f c out = 0.1f r l = 500 ? v in = 3.3v c in = 10f v in = 3.3v v in 2v/div v out 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 100s/div 500ns/div 20s/div 50s/div
8 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking typical characteristics c in = 10f c out = 0.1f 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 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 = 0.1f r l = 500 ? v in = 5.5v v in 5v/div v on 5v/div pgood 5v/div v out 5v/div 50s/div 50s/div 10s/div c in = 10f c out = 0.1f r l = 500 ? v in = 3.3v v drv 2 2v/div v out 2v/div i out 500ma/div v on 2v/div t blank v drv 2 2v/div v out 2v/div i out 500ma/div v on 2v/div t restart 20ms/div 100ms/div c in = 10f c out = 0.1f r l = 500 ? v in = 3.3v figure 20. current limit response time (output is loaded by 2.2 ? , c out = 10f) figure 22. t blank response figure 23. t restart response figure 21. pgood response figure 19. current limit response time (output is loaded by 2.2 ? , c out = 0.1f) fpf2140/42/44/46 fpf2140/44 note 2: v drv signal forces the device to go in to overcurrent condition by loading.
9 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking description of operation the fpf2140/42/43/44/46/47 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 sys tem malfunctions through current limiting, undervoltage lockout and thermal shutdown. the current limit is preset for either 200ma or 400ma. on/off control the on pin controls the state of the switch. activating on continuously holds the switch in the on state so long as there is no undervoltage on v in or a junction temperature in excess of 140c. on is active hi and has a low threshold making it capable of interfacing with lo w voltage signals. in addition, excessive currents will cause the switch to turn off for fpf2140/ 42 and FPF2144/46. the fpf2140/44 have an auto-restart feature which will automatically turn the switch on again after 450ms. for the fpf2142/46, the on pin must be toggled to turn-on the switch again. with no auto-restart, the fpf2143/47 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 undervoltage lockout have not activated. 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 fpf2140/42/44/46, the flagb goes lo at the end of the blanking time while flagb goes lo immediately for the fpf2143/47. flagb remains lo through the auto-restart time for the fpf2140/44. for the fpf2142/ 46, flagb is latched lo and on must be toggled to release it. with the fpf2143/47, 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 v in and flagb. during shutdown, the pull-down on flagb is disabled to reduce current draw from the supply. current limiting the current limit guarantees that the current through the switch doesn't exceed a maximum value while not limiting at less than a minimum value. for the fpf2140/42/43 the minimum current is 200ma and the maximum current is 400ma and for the FPF2144/46/47 the minimum current is 400ma and the maximum current is 800ma. the fpf2140/42/44/46 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 and the flagb pin will activate to indicate that current limiting has occurred. the fpf2143/47 have no current limit blanking period so immediately upon a current limi t 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. 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 controlled turn-on of the switch which limits current over-shoots. reverse current blocking the entire fpf2140/47 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 externally generated excessive temperatures. during an over-temperature condition the flagb is activated and the switch is turned-off. the switch automatically turns-on again if temperature of the die drops below the threshold temperature.
10 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking application information typical application 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 0.1f 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. output capacitor a 0.1uf capacitor c out , should be placed between v out and gnd. this capacitor will preven t parasitic board inductances from forcing v out below gnd when the switch turns-off. for the fpf2140/42/44/46, 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 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 most power and that will only be, if the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. for the fpf2140/44, 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, when using the fpf2142/46 attention must be given to the manual resetting of the part. the junction temperature will only be allowed to increase to the thermal shutdown threshold. once this temperature has been reached, toggling on will not turn-on the switch until the junction temperature drops. for the fpf2140/44, a short on the output will cause the part to operate in a constant current state dissipating a worst case power as calculated in (3) 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 mini mize 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 ef fects 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 protection feature. this concern applies specially with fpf2143 and fpf2147 where load switch turns on into an overcurrent condition and switch supplies constant current limit value. 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. off on on v in gnd fpf2140/2/3/4/6/7 flagb v out load battery 1.8v-5.5v c1 = 0.1f r1 = 100k ? c2 = 0.1f r2 = 499 ? pgood typical value = 100k ? c out (max) = i lim (max) x t blank (min) v in p = (i lim ) 2 x r ds = (0.8) 2 x 0.12 = 76.8mw (3) p(max) = t blank t blank + t rstrt x v in (max) x i lim (max) = 30 30 + 450 x 5.5 x 0.8 = 275mw (2) (1)
11 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking application notes power good function in sequential startup. no battery is loaded to the output power good fpf214x family has a "power g ood" feature. pgood pin is an open-drain mosfet which asserts high when the output voltage reaches 90% of the input voltage. pgood pin requires an external pull up resistor that is connected to the output voltage when there is no battery in the load side and the logic level of the subsequent controller permits. this would give logic le vels similar to a cmos output stage for pgood, while still keeping the option to tie the pull-up to a different supply voltage. a typical value of 100k ? is recommended to be used as pull up resistor. the pgood pin status is independent of the on pin position. this mean that pgood pin stays low when the load switch is off. if the power good feature is not used in the application the pin can be connected directly to gnd. sequential startup using power good the power good pin can be connected to another load switch's enable pin to implement sequential startup. pgood pin asserts low when the load switch is off. this feature allows driving a subsequent circuit. the above diagram illustrates power good function in sequential startup. as the v out1 of the first load switch starts to ramp to the 90% of its input voltage the second switch remains in off state. whereas the v out1 passes the 90% threshold, power good signal becomes active and asserts high. this signal will turn on the second load switch and v out2 will start to increase. the total startup time may vary according to the difference between supply voltages that are used in the application. off on on v in1 gnd fpf2140/2/ 3/4/6/7 flagb v out1 to load v in1 startup power sequence pgood 100k ? on v in2 gnd flagb v out2 to load v in2 pgood 100k ? fpf2140/2/ 3/4/6/7 tp
12 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking dimensional outlin e and pad layout
13 www.fairchildsemi.com fpf2140/42/43/44/46/47 rev. d fpf2140/42/43/44/46/47 full function load switch with revers e current blocking trademarks the following are registered and unregistered trademarks and serv ice marks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. disclaimer fairchild semiconductor reserves the right to make 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 product or circuit d escribed 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, specif ically the warranty therein, which covers these products. life support policy fairchild?s products are not auth orized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or sy stems 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 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 ? build it now? coreplus? crossvolt ? ctl? current transfer logic? ecospark ? fairchild ? fairchild semiconductor ? fact quiet series? fact ? fast ? fastvcore? fps? frfet ? global power resource sm green fps? green fps? e-series? gto? i-lo ? intellimax? isoplanar? megabuck? microcoupler? microfet? micropak? millerdrive? motion-spm? optologic ? optoplanar ? ? pdp-spm? power220 ? power247 ? poweredge ? power-spm? powertrench ? programmable active droop? qfet ? qs? qt optoelectronics? quiet series? rapidconfigure? smart start? spm ? stealth? superfet? supersot?-3 supersot?-6 supersot?-8 syncfet? the power franchise ? tinyboost? tinybuck? tinylogic ? tinyopto? tinypower? tinypwm? tinywire? serdes? uhc ? unifet? vcx? datasheet identification product status definition advance information formative or in design this datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary first production this datasheet contains prelimi nary 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. no identification needed full production this datasheet contains fi nal specifications. fairch ild semiconductor reserves the right to make changes at any time without notice to improve design. obsolete not in production this datasheet contains specific ations on a product that has been discontinued by fairchil d semiconductor. the datasheet is printed for reference information only. rev. i31

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