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smartswitch ? aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 1 general description the aat4670 smartswitch is a member of analogictech?s application specific power mos- fet? (aspm?) product family. the aat4670 consists of dual, independent, 1a current limited, slew rate controlled p-channel mosfet power switches with a dedicated source and drain pin assigned to each switch. the internal circuitry auto- matically derives power from the higher of the two input power source pins with a low operating quies- cent current of 18a. in shutdown mode, the supply current decreases to less than 1a. the switches operate with inputs ranging from 2.2v to 5.5v, mak- ing them ideal for 2.5v, 3v, and 5v systems. the dual configuration permits integration of the load switch function for systems with two different power busses. independent under-voltage lockout circuits will shut down the corresponding switch if its input voltage falls below the under-voltage lockout thresh- old. if the die temperature reaches the thermal limit, both switches thermal cycle off and on indefinitely without damage until the thermal condition is removed. an open drain fault output signals an over-current or over-temperature condition for each channel. input logic levels are ttl compatible. the aat4670 is available in a pb-free, space-sav- ing, thermally-enhanced tdfn 3x3x0.8mm 12-lead package. the device is also available in a pb-free 8-pin sop, tssop, or msop package and is spec- ified over the -40c to +85c temperature range. features ? 2.2v to 5.5v input voltage range ? 1a current limit per channel ? 95m typical r ds(on) ? fast transient response: ? <1s response to short circuit ? low 18a quiescent current ? 1a max with switches off ? slew rate controlled ? thermal shutdown ? fault flags with 3ms blanking ? under-voltage lockout ? temperature range: -40c to +85oc ? available in tdfn33-12, sop-8, tssop-8, or msop-8 package applications ? hot swap supplies ? media bay ? notebook computer ? pda, subnotebook ? peripheral ports ? usb ports typical application ina c ina 1 f c inb 1 f inb en faulta outa gnd aat4670 ina inb gnd gnd outa en faulta faultb faultb outb outb c outa 1 f c outb 1 f
aat4670 dual-input, dual-output load switch 2 4670.2006.09.1.4 pin descriptions pin configuration tdfn33-12 sop-8 tssop-8 msop-8 pin # tdfn other pkgs symbol function 1, 12 8 outa p-channel mosfet drain channel a. 2 1 en active-low enable input (logic low turns the switches on). 3 2 faulta open drain output; signals over-current for outa and over-tempera- ture condition. 4 3 faultb open drain output; signals over-current for outb and over-tempera- ture condition. 5 4 gnd ground connection. 6, 7 5 outb p-channel mosfet drain channel b. 8, 9 6 inb p-channel mosfet source channel b. 10, 11 7 ina p-channel mosfet source channel a. ep exposed paddle (bottom); connect to ground as closely as possible to the device. 1 2 ina outa inb outb en faulta faultb gnd 1 2 3 4 8 7 6 5 en faulta faultb gnd out a ina inb outb 4 3 2 1 5 6 7 8 1 2 ina outa inb outb en faulta faultb gnd 1 2 3 4 8 7 6 5 outa en faulta 1 faultb gnd outb out a ina ina inb inb outb 2 3 4 5 6 12 11 10 9 8 7
aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 3 absolute maximum ratings 1 t a = 25c, unless otherwise noted. thermal characteristics 3 symbol description value units ja maximum thermal resistance sop-8 100 c/w tdfn33-12 50 p d maximum power dissipation sop-8 1.25 w tdfn33-12 2.0 symbol description value units v ina,b ina or inb to gnd -0.3 to 6 v v outa,b outa or outb to gnd -0.3 to 6 v v faulta,b faulta or faultb to gnd -0.3 to 6 v i out output current internally limited a t j operating junction temperature range -40 to 150 c v esd esd rating 2 - hbm 4000 v t lead maximum soldering temperature (at leads) 300 c 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c ondi- tions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. human body model is a 100pf capacitor discharged through a 1.5k resistor into each pin. 3. mounted on a demo board.
aat4670 dual-input, dual-output load switch 4 4670.2006.09.1.4 electrical characteristics v in = 5v, t a = 25c, unless otherwise noted. bold values designate -40c to +85c temperature range. symbol description conditions min typ max units v in operation voltage 2.2 5.5 v i q quiescent current v ina or v inb = 5v i outa = i outb = 0 18 40 a i q(off) off supply current en = v in , v ina = v inb = 5v, outa, outb open 1 a i sd(off) off switch current en = v in , v ina = v inb = 5v, v outa = v outb = 0v 0.1 1 a v uvlo under-voltage lockout 1.7 2.2 v r ds(on) on-resistance channel v in = 5.0v 95 130 m a or b v in = 3.0v 105 150 t crds switch resistance 2800 ppm/c temperature coefficient i lim current limit channel a or b v out < v in to 0.5v 1.0 1.25 1.50 a t 1 output turn-on delay time v in = 5v, out = 0 to 10%, r load = 20 100 1000 s t 2 output rise time v in = 5v, out = 10% to 90%, r load = 20 100 1000 s t 3 output turn-off delay time v in = 5v, out = 100% to 90%, r load = 20 10 20 s t 4 output fall time v in = 5v, out = 90% to 10%, r load = 20 5 20 s v en(l) en input low voltage v in = 2.7v to 5.5v 1 0.8 v v en(h) en input high voltage v in = 2.7v to < 3.6v 2.0 v v in = 3.6v to 5.5v 2.4 i en(sink) en input leakage v en = 5.5v 0.01 1 a t resp current loop response v in = 5v 750 ns v faultlow fault logic output low i sink = 1ma 0.4 v i sink fault logic output high v fault = 5.5v 0.5 1 a leakage current t blank fault blanking time 3 ms t sd over-temperature threshold 125 c 1. for v in outside this range, consult typical en threshold curve.
aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 5 typical characteristics r ds(on) vs. temperature 60 70 80 90 100 110 120 130 140 150 -40 -20 0 20 40 60 80 100 120 temperature ( c) r ds(on) (m ) v in = 3v v in = 5v current limit vs. output voltage 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 012345 output voltage (v) output current (a) off-switch current vs. temperature 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 -40 -20 0 20 40 60 80 100 120 temperature ( c) off-switch current ( a) off-supply current vs. temperature 0.0000 0.0001 0.0010 0.0100 0.1000 1.0000 -40 -20 0 20 40 60 80 100 120 temperature ( c) off-supply current ( a) quiescent current vs. input voltage 0 2 4 6 8 10 12 14 16 18 20 0123456 input voltage (v) input current ( a) quiescent current vs. temperature 0 5 10 15 20 25 30 -40 -20 0 20 40 60 80 100 120 temperature ( c) quiescent current ( a)
aat4670 dual-input, dual-output load switch 6 4670.2006.09.1.4 typical characteristics typical en threshold vs. input voltage 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 1.5 2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) en threshold (v) v en(l) v en(h) thermal shutdown response time (200ms/div) on (5v/div) fault (5v/div) v out (1v/div) i in (500ma/div) short circuit through 0.3 -2 0 2 4 6 8 -1 0 1 2 3 4 time ( s) input and output voltage (v) -4 0 4 8 12 output current (a) input voltage output current output voltage short circuit through 0.6 0 2 4 6 8 -10 1234 time ( s) input and output voltage (v) -3 0 3 6 9 output current (a) input voltage output current output voltage fault delay start into 0.6 load time (500s/div) on (5v/div) fault (5v/div) v out (1v/div) i in (500ma/div) turn-on/off response with 20 1f loads time (100s/div) en (5v/div) fault (5v/div) outb (5v/div) inb = 5v outa (5v/div) ina = 3v i ina + i inb (200ma/div)
aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 7 functional description the aat4670 dual channel load switch, implement- ed with isolated independent p-channel mosfet devices, is ideal for applications where dual power supplies are in continuous use. typical applications for this include products with multiple usb ports, or ports requiring protection that operate from separate power supplies. the input power supplies can be any voltage between 2.2v and 5.5v in any combina- tion; one supply is not required to be the higher volt- age. internally, the power supply for the control cir- cuitry will automatically switch to the higher of the two supplies. in the case where the supplies are equal, 30mv of hysteresis prevents the internal supply from oscillating between the two input supplies. the low impedance p-channel mosfet devices are identical in size, allowing for layout flexibility. they are controlled by a patented fast acting current loop and respond to short circuits in a fraction of a microsecond, easing requirements on the input capacitors. with such fast transient response time, the upstream power supply rail is naturally isolated from the protected port. the aat4670 is internally protected from thermal damage by an over-temperature detection circuit. if a high ambient temperature or an over-current con- dition causes the die temperature to reach the inter- nal thermal limit, both power devices are switched off until the die temperature cools to a level below the thermal limit threshold. the device will thermal cycle indefinitely until the over-current or high temperature condition is removed. due to the high thermal con- ductivity of silicon and the size of the die, the tem- perature across the die is relatively uniform at high temperatures; therefore, as a precaution, both power devices are switched off when the thermal threshold is reached. since the power devices operate from independent power supplies, independent under- voltage lockout circuits are employed. if the power supply to one channel falls below the under-voltage lockout threshold, the other channel will remain active. a current limit condition is reported by the open drain fault output associated with the appro- priate channel. a thermal limit condition is reported by both fault outputs. a three millisecond blanking interval prevents false reporting during the charging of a capacitive load, which typically occurs during device turn-on, but may also occur during a port hot plug-in event. the aat4670 is ideally suited for protection of periph- eral ports such as usb, ps2, and parallel ports. functional block diagram inb ina outa en faultb slew rate i lim otmp uvlo slew rate i lim uvlo outb faulta gnd
aat4670 dual-input, dual-output load switch 8 4670.2006.09.1.4 applications information input capacitor the input capacitors, c ina and c inb , protect the input power supplies from current transients gener- ated by loads attached to the aat4670. if a short circuit is suddenly applied to an output of the aat4670, there is a 750 nanosecond period during which a large current flows before current limit cir- cuitry activates. (see characteristic curve "short circuit through 0.3 .") in this event, a properly sized input capacitor can dramatically reduce the voltage transient seen by the power supply and other circuitry upstream from the aat4670. c in should be located as close to the device vin pin as practically possible. ceramic, tantalum, or alu- minum electrolytic capacitors may be selected for c in . there is no specific capacitor equivalent series resistance (esr) requirement for c in . however, for higher current operation, ceramic capacitors are recommended for c in due to their inherent capabil- ity over tantalum capacitors to withstand input cur- rent surges from low impedance sources such as batteries in portable devices. output capacitor in order to insure stability while the current limit is active, a small capacitance of approximately 1f is required on each output. no matter how big the output capacitor, output current is limited to the value set by the aat4670 current limiting circuitry, allowing very large output capacitors to be used. for example, usb ports are specified to have at least 120f of capacitance downstream from their controlling power switch. the current limiting circuit will allow an output capacitance of 1000f or more without disturbing the upstream power supply. attaching loads capacitive loads attached to the aat4670 will charge at a rate no greater than the current limit setting. fault output fault flags are provided to alert the system if an aat4670 load is not receiving sufficient voltage to operate properly. if current limit or over-tempera- ture circuits in any combination are active for more than approximately three milliseconds, the associ- ated fault flag is pulled to ground through approximately 100 . removal of voltage or cur- rent transients of less than three milliseconds pre- vents capacitive loads connected to either aat4670 output from activating the associated fault flag when they are initially attached. pull-up resistances of 1k to 100k are recommended. since fault is an open drain terminal, it may be pulled up to any unrelated voltage less than the maximum operating voltage of 5.5v, allowing for level shifting between circuits. thermal considerations since the aat4670 has internal current limit and over-temperature protection, junction temperature is rarely a concern. however, if the application requires large currents in a hot environment, it is possible that temperature, rather than current limit, will be the dominant regulating condition. in these applications, the maximum current available with- out risk of an over-temperature condition must be calculated. the maximum internal temperature while current limit is not active can be calculated using equation 1. eq. 1: in equation 1, i max is the maximum current required by the load. r ds(on)(max) is the maximum rated r ds(on) of the aat4670 at high temperature. r ja is the thermal resistance between the aat4670 die and the board onto which it is mount- ed. t a(max) is the maximum temperature that the pcb under the aat4670 would be if the aat4670 were not dissipating power. equation 1 can be rearranged to solve for i max ; equation 2. eq. 2: t sd(min) is the minimum temperature required to activate the aat4670 over-temperature protection. with typical specification of 125c, 115c is a safe minimum value to use. = i max t sd(min) - t a(max) r ds(on)(max) r ja t j(max) = i max 2 r ds(on)(max) r ja + t a(max)
aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 9 for example, if an application is specified to oper- ate in 50c environments, the pcb operates at temperatures as high as 85c. the application is sealed and its pcb is small, causing r ja to be approximately 120c/w. using equation 2: eq. 3: to prevent thermal limiting, the operating load cur- rent in the application must be less than 1.25a which lies in the current limiting range. so, in this application, any operating current below the cur- rent limit threshold is allowed. timing diagram = i max = 1.25a 115 - 85 160m 120 en out t1 t2 t3 t4
aat4670 dual-input, dual-output load switch 10 4670.2006.09.1.4 ordering information package information sop-8 all dimensions in millimeters. package marking 1 part number (tape and reel) 2 sop-8 4670 aat4670ias-t1 tssop-8 4670 aat4670ihs-t1 msop-8 bfxyy aat4670iks-t1 tdfn33-12 AAT4670IWP-T1 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . 0.175 0.075 6.00 0.20 3.90 0.10 1.55 0.20 1.27 bsc 0.42 0.09 8 4.90 0.10 4 4 45 0.375 0.125 0.235 0.045 0.825 0.445 all analogictech products are offered in pb-free packaging. the term ?pb-free? means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/pbfree.
tssop-8 all dimensions in millimeters. aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 11 detail a 4.40 0.10 6.40 0.20 0.65 bsc 3.00 0.10 0.245 0.055 8 0.10 0.05 0.60 0.15 0.145 0.055 1.05 max 1.20 max 4 4 12 12 ref 4 1.00 ref
msop-8 all dimensions in millimeters. aat4670 dual-input, dual-output load switch 12 4670.2006.09.1.4 pin 1 1.95 bsc 0.254 bsc 0.155 0.075 0.60 0.20 3.00 0.10 0.95 0.15 0.95 ref 0.85 0.10 3.00 0.10 10 5 4 4 0.65 bsc 0.30 0.08 0.075 0.075 4.90 0.10 gauge plane
tdfn33-12 all dimensions in millimeters. aat4670 dual-input, dual-output load switch 4670.2006.09.1.4 13 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or specifi cations or to discontinue any product or service without notice. customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information b eing relied on is current and complete. all products are sold sub- ject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. analogictech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with anal ogictech?s standard warranty. testing and other quality con- trol techniques are utilized to the extent analogictech deems necessary to support this warranty. specific testing of all param eters of each device is not necessarily performed. analogictech and the analogictech logo are trademarks of advanced analogic technologies incorporated. all other brand and produ ct names appearing in this document are regis- tered trademarks or trademarks of their respective holders. top view bottom view detail "b" detail "a" side view 3.00 0.05 index area (d/2 x e/2) detail "a" detail "b" 1.70 0.05 3.00 0.05 0.05 0.05 0.229 0.051 7.5 7.5 2.40 0.05 0.16 pin 1 indicator (optional) 0.375 0.125 0.3 0.10 0.45 0.05 0.23 0.05 0.075 0.075 0.1 ref 0.8 + 0.05 -0.20 option a: c0.30 (4x) max chamfered corner option b: r0.30 (4x) max round corner

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