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aat4601a data sheet 1.8a current limited p-channel switch 1 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 typical application aat4601a on in out set gnd on 1f 100k r set 1f input output in out fault 1 2 83 6 75 4 general description the aat4601a 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 aat4601a 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 aat4601a is available in a pb-free, 8-pin sop or msop package and is specified over the -40c to +85c temperature 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 approvedfile no. e217765 8-pin sop or msop package applications hot swap supplies notebook computers peripheral ports usb ports ul recognized component downloaded from: http:///
aat4601a 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 201914a 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 temperature exceeds +135oc, with a 2ms delay after the fault event occurs. pin configuration sop-8 msop-8 (top view) (top view) 1 2 out fault out set in in on gnd 12 3 4 87 6 5 1 2 out fault out set in in on gnd 12 3 4 87 6 5 downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 3 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at conditions 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 v set, v out set, out to gnd -0.3 to v in + 0.3 v 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 c v esd esd ratinghbm 2 4000 v thermal characteristics 3 symbol description value units ? ja maximum thermal resistance sop-8 100 c/w msop-8 150 p d maximum power dissipation sop-8 1.25 w msop-8 833 mw downloaded from: http:///
aat4601a 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 201914a 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 a i sd(off) off-switch current on = in, v in = 5.5v, v out = 0 0.07 15 a 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 = 20.5k ? 750 1000 1250 ma i lim(min) minimum current limit 260 ma 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 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 s downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 5 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 typical characteristicsunless 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 = 20.5k ; v in = 5.0v) output voltage (v) output current (a) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 01 23 45 r set i lim product vs. i lim 500 1000 1500 2000 2500 0 0.5 1 1.5 2 typical i lim (a) product (v) 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) downloaded from: http:///
aat4601a 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 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 typical characteristicsunless 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 1.81.6 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) downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 7 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 typical characteristicsunless 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 downloaded from: http:///
aat4601a 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 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 functional description the aat4601a 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 aat4601a 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 aat4601a 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 aat4601a 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 aat4601a 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 aat4601a 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. functional block diagram in on set fault out under- voltage lockout over-temperature protection 1.2v reference current limit downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 9 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 applications informationsetting current limit a simple three-step procedure can be used to adjust the aat4601as 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 as listed in the column, device will not current limit below. the resistor value needed is listed in the corresponding row in the column, r set . for exam- ple, a usb port requires 500ma. the lowest level where the device will current limit above 500ma is 507ma. the corresponding resistor value for r set would be 33k ? . 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 reading the column, device always current limits below. if the power supply connected to the aat4601as 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 aat4601a with a 33k ? resistor connected between the set pin and gnd. if the power supply connected to the aat4601a's in pin can provide more than 845ma, this supply will remain in regulation even if a short circuit is applied to the usb port. r set (k ) current limit typ (ma) device will not current limit below (ma) device always current limits below (ma) 7.5 2476 1857 3095 8.2 2277 1708 2847 9.1 2065 1549 2581 10 1895 1421 2369 11 1748 1311 2185 12 1633 1224 2041 13 1528 1146 1910 15 1353 1015 1691 16 1280 960 1600 18 1158 869 1448 20 1055 791 1318 22 972 729 1215 24 897 673 1122 27 811 608 1014 30 736 552 919 33 676 507 845 36 625 469 781 39 582 436 727 43 533 400 666 47 491 368 613 51 455 341 568 56 418 314 523 62 380 285 476 68 350 262 437 75 320 240 400 82 295 221 369 91 267 200 334 100 245 183 306 110 223 167 279 120 206 155 258 130 192 144 239 150 167 125 209 160 157 118 197 table 1: current limit r set values. downloaded from: http:///
aat4601a 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 201914a 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 33k ? figure 1: overload operation. operation in current limit if an excessive load is applied to the output of an aat4601a, the load current will be limited by the devices current limit circuitry as shown in figure 1, overload operation. if a short circuit were to occur on the load, it would demand more current than allowed by the inter- nal current limiting circuit and the voltage at the aat4601as output would drop. this causes the aat4601a to dissipate more power than in normal operation, caus- ing the die temperature to increase. when die tempera- ture exceeds the internal over-temperature threshold, the aat4601a will shut down. after shutting down, the aat4601a cools to a level below the over-temperature threshold, at which point it will start up again. the aat4601a will continue to cycle off and on until one of the following events occurs: the load current is reduced to a level below the aat4601as 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 aat4601a 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 aat4601a at high temperature. r ? ja is the thermal resis- tance between the aat4601as 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 aat4601a 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 aat4601as over-temperature protection. with a typical 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 print- ed circuit 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. downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 11 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 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 aat4601a, 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 aat4601a. the second purpose of the input capacitor is to prevent transient events generated by the load circuit from affecting operation of the aat4601a. for example, if an aat4601a 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 aat4601a's under- voltage lockout threshold. this drop in voltage would cause the aat4601a to turn off until the input power supply's 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 capacitorin order to insure stability while the device current limit is active, a small capacitance of approximately 1 f should be used. when the aat4601a 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 aat4601a used to control the usb port. on input when the aat4601a 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 aat4601a 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 continuously active for more than approximately 2ms, the fault pin is pulled to ground internally through a 100 ? resistance. the 2ms delay on the fault function is intended to pre- vent capacitive loads connected to the load switch out- put 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 present on the in pin. this is done to allow the aat4601a to signal ancillary circuitry that is powered by a voltage level less than the level on the in pin. reverse voltage the aat4601a is designed to control current flowing from in to out. if a voltage is applied to out that is greater than that on in, a large resulting reverse current may flow, potentially damaging the aat4601a. printed circuit board layout recommendations for proper thermal management, and to take advantage of the low r ds(on) of the aat4601a, a few circuit board layout 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 aat4601a evaluation layout follows the printed cir- cuit board layout recommendations and can be used for good applications layout. note: board layout shown is not to scale. downloaded from: http:///
aat4601a 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 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 figure 1: aat4601a evaluation figure 2: aat4601a evaluation board top side silk screen board component side layout. assembly drawing. figure 3: aat4601a evaluation board solder side layout. downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 13 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold . ordering information package marking 1 part number (tape and reel) 2 sop-8 4601a aat4601aias-t1 msop-8 mqxyy AAT4601AIKS-T1 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. 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. downloaded from: http:///
aat4601a data sheet 1.8a current limited p-channel switch 14 skyworks solutions, inc. phone [781] 376-3000 fax [781] 376-3100 sales@skyworksinc.com www.skyworksinc.com 201914a skyworks proprietary information products and product information are subject to change without notice. may 3, 2012 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 materials, including the information contained herein, are provided by sky works 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 information 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 informatio n provided here- under, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be provided 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. skyworks 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 conditions, posted at www.skyworksinc.com, are incorporated by reference. msop-8 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 all dimensions in millimeters. downloaded from: http:///

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