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aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 1 typical application aat4601 on in out set gnd 1f 100k r set 1f input output in out fault 1 2 8 3 6 7 5 4 on general description the aat4601 smartswitch is a member of skyworks' application specific power mosfet? (aspm?) product family. it is a 1.8a current limited p-channel mosfet power switch designed for high-side load switching appli- cations. this switch operates with inputs ranging from 2.7v to 5.5v, making it ideal for both 3v and 5v systems. an integrated current-limiting circuit protects the input supply against large changes in load current which could cause the supply to fall out of regulation. the aat4601 has protection from thermal overload which limits power dissipation and junction temperatures. the maximum current limit level will guarantee that 1.8a can be deliv- ered to the load; the actual threshold is programmed with a resistor from the set pin to ground. the quiescent supply current is typically 12 a. in shutdown mode, the supply current decreases to less than 1 a. the aat4601 is available in a pb-free, 8-pin sop pack- age and is specified over the -40c to +85c tempera- ture range. features ? input voltage: 2.7v to 5.5v ? programmable over-current threshold ? low quiescent current ? 12 a typical ? less than 1 a with switch off ? only 2.5v needed for on control ? thermal shutdown ? fault flag ? 2ms fault blanking ? under-voltage lockout ? temperature range: -40c to +85c ? 4kv esd rating ? ul approved?file no. e217765 ? 8-pin sop package applications ? hot swap supplies ? notebook computers ? peripheral ports ? usb ports ul recognized component
aat4601 data sheet 1.8a current limited p-channel switch 2 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 pin descriptions pin # symbol function 1, 2 in these pins are the input to the p-channel mosfet source. connect a 1 f capacitor from in to gnd. 3 on active low enable input. a logic low turns the switch on. 4 gnd ground. 5 set current limit set input. a resistor from set to ground sets the current limit for the switch. 6, 7 out these pins are the p-channel mosfet drain connection. connect a 1 f capacitor from out to gnd. 8 fault fault indication output. this open-drain output goes low when in current limit or when the die tem- perature exceeds +135oc, with a 2ms delay after the fault event occurs. pin configuration sop-8 (top view) 1 2 out fault out set in in on gnd 1 2 3 4 8 7 6 5
aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 3 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c onditions other than the operating conditions specified is not implied. 2. human body model is a 100pf capacitor discharged through a 1.5k ? resistor into each pin. 3. mounted on an fr4 printed circuit board. absolute maximum ratings 1 t a = 25c, unless otherwise noted. symbol description value units v in in to gnd -0.3 to 6 v v on, v fault on ,fault to gnd -0.3 to v in + 0.3 v set, v out set, out to gnd -0.3 to v in + 0.3 i max maximum continuous switch current 3 a t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads) 300 v esd esd rating?hbm 2 4kv thermal characteristics 3 symbol description value units ? ja maximum thermal resistance 100 c/w p d maximum power dissipation 1.25 w
aat4601 data sheet 1.8a current limited p-channel switch 4 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 1. guaranteed by design. electrical characteristics v in = 5v, t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units v in operation voltage 2.7 5.5 v i q quiescent current v in = 5v, on = gnd, i out = 0 12 30 a i q(off) off-supply current on = in, v in = 5.5v 0.004 1 i sd(off) off-switch current on = in, v in = 5.5v, v out = 0 0.07 15 v uvlo under-voltage lockout rising edge, 1% hysteresis 2.0 2.3 2.7 v r ds(on) on resistance v in = 5.0v 70 120 m ? v in = 4.5v 75 130 v in = 3.0v 80 150 v in = 3.0v, t a = 25c 80 110 i lim current limit r set = 2k ? 510 715 920 ma i lim(min) minimum current limit 375 otmp shutdown temperature v in = 5v 125 oc v onl on input low voltage 0.8 v v onh on input high voltage v in = 2.7v to 3.6v 2.0 v in = 4.5v to 5.5v 2.4 i onsink on input leakage v on = 5.5v 0.01 1 a v faultl fault logic output low voltage i sink =1ma 0.08 0.4 v i fsink fault logic output high leakage v fault = 5.5v 0.05 1 a t resp current limit response time v in = 5v 2 s t blank fault blanking time after turn-on 2 ms t off turn-off time 1 v in = 5v 20 s t on turn-on time 1 v in = 5v 200
aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 5 typical characteristics unless otherwise noted, v in = 5v, t a = 25c. quiescent current vs. temperature 0 5 10 15 20 25 -40 -20 0 20 40 60 80 100 120 temperature (c) quiescent current (a) 0 0123456 5 10 15 20 25 quiescent current input voltage (v) input current (a) current limit (r set = 2k; v in = 5v) 0 0.2 0.4 0.6 0.8 1.0 012345 output voltage (v) output current (a) r set * i lim product vs. i lim typical i lim (a) product (v) 18000 19000 20000 21000 22000 23000 24000 25000 0.0 0.5 1.0 1.5 2.0 2.5 off-supply current vs. temperature 0.0001 0.001 0.01 0.1 1 10 -40 -20 0 20 40 60 80 100 120 140 temperature (c) off-supply current (a) off-switch current vs. temperature 1 0.1 0.01 0.001 0.0001 10 -40 -20 0 20 40 60 80 100 120 140 temperature (c) off-switch current (a)
aat4601 data sheet 1.8a current limited p-channel switch 6 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 typical characteristics unless otherwise noted, v in = 5v, t a = 25c. turn-on time vs. temperature 0 10 20 30 40 50 60 70 80 -40 -20 0 20 40 60 80 100 120 temperature (c) turn-on time (s) v in = 3v v in = 5v turn-off time vs. temperature 0 0.2 0.4 0.6 0.8 1.0 1.8 1.6 1.4 1.2 2.0 -40 -20 0 20 40 60 80 100 120 temperature (c) turn-off time (s) v in = 5v v in = 3v switch turn-on time -1 0 1 2 3 4 5 6 -20 -10 0 40 60 80 time (s) voltage (v) output on i out = i limit switch turn-off time -1 0 1 2 3 4 5 6 -4-20246 time (s) voltage (v) output on i out = i limit short-circuit through 0.3 0 2 4 6 8 02468 time (s) input and output voltage (v) output current (a) -4 0 4 8 12 output current output voltage input voltage short-circuit through 0.6 0 2 4 6 8 -20 0 20 40 60 80 100 120 140 -3 0 3 6 9 output current output voltage input voltage time (s) input and output voltage (v) output current (a)
aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 7 typical characteristics unless otherwise noted, v in = 5v, t a = 25c. fault delay vs. temperature 0 0.5 1.0 1.5 2.0 2.5 -40 -20 0 20 40 60 80 100 temperature (c) fault delay (ms) r ds(on) vs. temperature 40 50 60 70 80 90 100 -4 0 -20 0 20 40 60 80 temperature (c) r ds(on) (m) v in = 4.5v v in = 3v
aat4601 data sheet 1.8a current limited p-channel switch 8 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 functional block diagram in on set fault out under- voltage lockout over-temperature protection 1.2v reference current limit functional description the aat4601 is an integrated mosfet load switch with an adjustable current limit, over-temperature protection, level-shifted input, and a fault flag. the current limit control is combined with an over-temperature thermal limit circuit to provide a comprehensive system to pro- tect the load switch under short-circuit or other adverse operating conditions. the aat4601 is ideally suited for control and protection of peripheral ports such as usb, rs232, and parallel ports. the current limit and over-temperature circuits will act independently. the device current limit is activated when the output load current exceeds an internal threshold level. the internal current limit threshold is determined by an external resistor connected between the set pin and ground. the minimum current limit threshold is specified by i lim(min) . if the load switch ambient tempera- ture becomes excessive or if a short-circuit condition persists, the die temperature will rise, causing the over- temperature protection circuit to activate. if a current limit level less than i lim(min) is required, the aat4601 can be used to operate in foldback current limit mode. to achieve this, an r set value can be chosen to program a current limit lower than i lim(min) ; in this case, when the load current reaches i lim(min) , the current will immediately drop, limiting at the programmed value. if the current limit or over-temperature protection cir- cuits are active for more than 2ms, the system will be informed via the fault flag. the 2ms delay allows the aat4601 to be turned on into capacitive loads without activating the fault flag. the open drain fault output can be connected directly to system controllers driven by voltage levels less than the in pin voltage without addi- tional level shifting circuitry. the load switch is turned off by applying a logic high level to the on pin. the aat4601 typically consumes 12 a when operating; when off, the device draws less than 1 a. in the off state, current is prevented from flowing between the input and output. the on function has logic level thresholds that allow the aat4601 to be ttl com- patible and may also be controlled by 2.5v to 5.0v cmos circuits. the voltage level on either on or fault should not exceed the input supply level present on the in pin.
aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 9 applications information setting current limit a simple three-step procedure can be used to adjust the aat4601?s current limit. first, the maximum current required by the load should be determined. second, select a resistor that guarantees adequate current is available to the load under normal conditions. finally, the maximum current that can pass through the switch can be calculated and compared to the maximum current available. step 1: the maximum current required by a load is usu- ally defined in port specifications design application ref- erences. for example, usb ports may be specified to support loads of up to 500ma. step 2: the most convenient method for determining a current limit resistor value is to look it up in table 1, ?current limit r set values.?. find the lowest current value that is greater than the maximum load current in the given application; refer to the column, ?device will not current limit below.? the resistor value needed is in the corresponding row named ?r set .? for example, a usb port requires 500ma. the lowest level where the device will current limit above 500ma is 516ma. the corre- sponding resistor value for r set would be 2k ? . step 3: now the required resistor value has been deter- mined. the maximum current that can be drawn, even with a short circuit applied to the output, can be deter- mined by referring to the column labeled, ?device always current limits below.? if the power supply connected to the aat4601?s input can provide this current level, the power supply voltage will not collapse when a short cir- cuit is applied to the load switch output. for example, a notebook computer has a usb port which is powered by an aat4601 with a 2k ? resistor connected between the set pin and gnd. if the power supply connected to the aat4601's in pin can provide more than 917ma, this supply will remain in regulation even if a short circuit is applied to the usb port. r set ( ) current limit typ (ma) device will not current limit below (ma) device always current limits below (ma) 0 2510 1807 3213 10 2463 1773 3152 20 2423 1745 3102 30 2386 1718 3054 36 2361 1700 3022 47 2332 1679 2985 56 2297 1654 2940 68 2258 1626 2890 82 2214 1594 2834 100 2161 1556 2766 120 2107 1517 2697 150 2028 1460 2596 200 1918 1381 2455 240 1840 1325 2355 300 1737 1251 2223 360 1649 1187 2111 470 1585 1141 2029 510 1529 1101 1957 560 1466 1055 1876 620 1397 1006 1788 680 1334 960 1707 750 1266 911 1620 820 1206 869 1544 910 1144 823 1464 1000 1089 784 1394 1100 1034 745 1324 1200 986 710 1262 1300 941 677 1204 1500 865 623 1107 1600 829 597 1061 1800 769 554 985 2000 716 516 917 2200 673 485 861 2400 633 456 811 2700 582 419 745 3000 539 388 690 3300 502 362 643 3600 470 339 602 3900 442 318 565 4300 410 295 524 4700 382 275 489 5100 358 258 458 5600 332 239 424 6200 306 220 392 6800 283 204 362 7500 268 193 343 table 1: current limit r set values.
aat4601 data sheet 1.8a current limited p-channel switch 10 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 0 1 2 3 4 5 6 -0.5 0 0.5 1 1.5 2 time (s) voltage (v) output voltage input voltage 1 ? is applied to output at t = 0 r set is 2k ? figure 1: overload operation. operation in current limit if an excessive load is applied to the output of an aat4601, the load current will be limited by the device?s current limit circuitry. refer to figure 1, overload operation. if a short circuit were to occur on the load, it would demand more current than allowed by the internal current limiting circuit and the voltage at the aat4601?s output would drop. this causes the aat4601 to dissipate more power than in normal operation, causing the die temperature to increase. when die temperature exceeds the internal over-temperature threshold, the aat4601 will shut down. after shutting down, the aat4601 cools to a level below the over-temperature threshold, at which point it will start up again. the aat4601 will con- tinue to cycle off and on until one of the following events occurs: the load current is reduced to a level below the aat4601?s current limit setting; the input power is removed; or the output is turned off by a logic high level applied to the on pin. thermal considerations since the aat4601 has internal current limit and over- temperature protection, junction temperature is rarely a concern. if an application requires a large load current in a high-temperature operating environment, there is the possibility that the over-temperature protection circuit, rather than the current limit circuit, will regulate the cur- rent available to the load. in these applications, the maximum current available without risk of activation of the over-temperature circuit can be calculated. the maximum internal temperature while current limit is not active can be calculated using equation 1: eq. 1: t j(max) = i max 2 ? r ds(on)(max) ? r ja + t a(max) 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 aat4601 at high temperature. r ? ja is the thermal resis- tance between the aat4601?s die and the board onto which it is mounted. t a(max) is the maximum ambient temperature for the printed circuit board assembly under the aat4601 when the load switch is not dissipating power. equation 1 can be transformed to provide i max ; refer to equation 2: eq. 2: = i max t sd(min) - t a(max) r ds(on)(max) ? r ja t sd(min) is the minimum temperature required to activate the aat4601?s over-temperature protection. with a typi- cal specification of 125c, 115c is a safe minimum value to use. for example, a portable device is specified to operate in a 50c environment. the printed circuit board assembly will operate at temperatures as high as 85c. this por- table device has a sealed case and the area of the printed board assembly is relatively small, causing r ? ja to be approximately 120c/w. using equation 2: eq. 3: = i max = 1.4 a 115c - 85c 0.13 120 c/w if this system requires less than 1.4a, the thermal limit will not activate during normal operation.
aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 11 input capacitor the input capacitor serves two purposes. first, it pro- tects the source power supply from transient current effects generated by the application load circuit. if a short circuit is suddenly applied to the output of an aat4601, there is a microsecond-long period during which a large current can flow before the current limit circuitry activates; refer to the characteristic curve, ?short-circuit through 0.3 ? ." a properly sized input capacitor can dramatically reduce the load switch input transient response effects seen by the power supply and other circuitry upstream from the aat4601. the second purpose of the input capacitor is to prevent transient events generated by the load circuit from affect- ing operation of the aat4601. for example, if an aat4601 is used in a circuit that operates from a 3v power supply with poor step load response, it is possible that turning on the load switch could cause the input power supply to droop below the aat4601's under-voltage lockout thresh- old. this drop in voltage would cause the aat4601 to turn off until the input power supply voltage recovers. since this cycle would be self-perpetuating, the entire circuit could be seen to be unstable. in the very rare case where capacitor cost is prohibitive, the output load circuit should be slew rate limited when turned on. output capacitor in order to insure stability while the device current limit is active, a small capacitance of approximately 1 f should be used. when the aat4601 is activated using the on function, there are no momentary current tran- sients, as in the case when a short circuit is suddenly applied to a device that is already on; refer to the char- acteristic curve, ?switch turn-on time.? no matter how big the output capacitor, output current is limited to the value allowed by the threshold determined by r set and the internal current limiting circuitry. this permits very large output capacitors to be used. for example, usb ports are specified to have at least 120 f of downstream capacitance from their controlling power switch. an output capacitance as large as 1000 f would not disturb the input power supply to the aat4601 used to control the usb port. on input when the aat4601 is in the off state, the output is an open circuit and the device quiecent current consump- tion is reduced to less than 1 a. the on threshold volt- age is set to allow the aat4601 to be controlled by 5v ttl levels, as well as cmos power from 2.5v to 5v. the on function control voltage level should not exceed the input supply level applied to the in pin. fault output a fault flag is provided to alert a system if the load switch is not receiving a sufficient voltage level to prop- erly operate. if either the current limit or over-tempera- ture circuits in any combination are active for more than approximately 2ms continuously, the fault pin is pulled to ground internally through a 100 ? resistance. the 2ms delay on the fault function is intended to prevent capacitive loads connected to the load switch output from activating fault when the device is turned on. the placement of a pull-up resistor between the fault pin and the in pin is recommended. reasonable values for the pull-up resistor should range from 10k ? to 100k ? . since fault is an open drain terminal, it may be pulled up to any voltage that is not greater than the level pres- ent on the in pin. this is done to allow the aat4601 to signal ancillary circuitry that is powered by a voltage level less than the level on the in pin. reverse voltage the aat4601 is designed to control current flowing from in to out. if a voltage is applied to out which is great- er than that on in, a large resulting reverse current may flow, potentially damaging the aat4601. printed circuit board layout recommendations for proper thermal management, and to take advantage of the low r ds(on) of the aat4601, a few circuit board lay- out rules should be followed: v in and v out should be routed using wider than normal traces, and gnd should be connected to a ground plane. for best performance, c in and c out should be placed close to the package pins. evaluation board layout the aat4601 evaluation layout follows the printed circuit board layout recommendations, and can be used for good applications layout. note: board layout shown is not to scale.
aat4601 data sheet 1.8a current limited p-channel switch 12 skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 figure 1: aat4601 evaluation figure 2: aat4601 evaluation board top side silk screen board component side layout. assembly drawing. figure 3: aat4601 evaluation board solder side layout.
aat4601 data sheet 1.8a current limited p-channel switch skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201913a ? skyworks proprietary information ? products and product information are subject to change without notice. ? may 3, 2012 13 copyright ? 2012 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with skyworks solutions, inc. (?skyworks?) products or services. these m aterials, including the information contained herein, are provided by skyworks as a service to its customers and may be used for informational purposes only by the customer. skyworks assumes no responsibility fo r errors or omissions in these materials or the information contained herein. sky- works may change its documentation, products, services, speci cations or product descriptions at any time, without notice. skyworks makes no commitment to update the materials or informati on and shall have no responsibility whatsoever for con icts, incompatibilities, or other dif culties arising from any future changes. no license, whether express, implied, by estoppel or otherwise, is granted to any intellectual property rights by this document . skyworks assumes no liability for any materials, products or information provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be p rovided in skyworks terms and conditions of sale. the materials, products and information are provided ?as is? without warranty of any kind, whether express, implied, statutory, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non-infringement of any intellectual property right; all such warranti es are hereby expressly disclaimed. skyworks does not warrant the accuracy or completeness of the information, text, graphics or other items contained within these materials. sk yworks shall not be liable for any damages, in- cluding but not limited to any special, indirect, incidental, statutory, or consequential damages, including without limitation , lost revenues or lost profits that may result from the use of the materials or information, whether or not the recipient of materials has been advised of the possibility of such damage. skyworks products are not intended for use in medical, lifesaving or life-sustaining applications, or other equipment in which the failure of the skyworks products could lead to personal injury, death, physical or en- vironmental damage. skyworks customers using or selling skyworks products for use in such applications do so at their own risk and agree to fully indemnify skyworks for any damages resulting from such improper use or sale. customers are responsible for their products and applications using skyworks products, which may deviate from published speci cations as a result of design defects, errors, or operation of products outside of pub- lished parameters or design speci cations. customers should include design and operating safeguards to minimize these and other risks. skyworks assumes no liabi lity for applications assistance, customer product design, or damage to any equipment resulting from the use of skyworks products outside of stated published speci cations or parameters. skyworks, the skyworks symbol, and ?breakthrough simplicity? are trademarks or registered trademarks of skyworks solutions, inc ., in the united states and other countries. third-party brands and names are for identi cation purposes only, and are the property of their respective owners. additional information, including relevant terms and co nditions, posted at www.skyworksinc.com, are incorporated by reference. ordering information package marking 1 part number (tape and reel) 2 sop-8 4601 AAT4601IAS-T1 package information sop-8 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 dimensions in millimeters. 1. xyy = assembly and date code. 2. sample stock is generally held on all part numbers listed in bold . skyworks green? products are compliant with all applicable legislation and are halogen-free. for additional information, refer to skyworks de?ition of green , document number sq04-0074.

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