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skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product information are subject to change without notice ? may 17 , 201 3 1 data sheet aat3221/aat3222 : 150 ma nanopower tm ldo linear regulator applications ? cellular p hones ? digital c ameras ? handheld e lectronics ? notebook c omputers ? pdas ? portable c ommunication d evices ? remote c ontrols features ? quiescent c urrent : 1.1 a ? low d ropout: 20 0 mv (typical) ? guaranteed o utput : 150 ma ? high a ccuracy: 2% ? current l imit p rotection ? over -t emperature p rotection ? extremely l ow p ower s hutdown m ode ? low t emperature c oefficient ? factory - p rogrammed o utput v oltages : 1.5 v to 3.5 v ? stable o peration w ith v irtual ly a ny o utput c apacitor t ype ? active h igh or l ow e nable p in ? small , 5- p in sot23 or 8 - p in sc70jw (aat3221 only) p ackage (msl1, 260 c per jedec - j - std - 020) description the aat3221 and aat3222 nanopower ? l ow d rop o ut (ldo) linear regulators are ideal for por table applications where extended battery life is critical. these devices feature extremely low quiescent current, typically 1.1 a. dropout voltage is also very low, typically less than 200 mv at the maximum output current of 150 ma. the aat3221/3222 have an enable pin which, when asserted, places the ldo regulator into shutdown mode, removing power from its load and offering extended power conservation capabilities for portable battery - powered applications . the aat3221/3222 have output short - circuit and o ver - current protection. in addition, the devices also have an over - temperature protection circuit that shut s down the ldo regulator during extended over - current events. both devices are available with active high or active low enable input. the aat3221 and aat3222 are available in pb - free, space - saving 5- pin sot23 packages. the aat3221 is also available in a pb - free, 8 - pin sc70jw package. since only a small, 1 f ceramic output capacitor is recommended, often the only space used is that occupied by the aat3 221 or aat3222 . the aat3221/3222 provide a compact and cost - effective voltage conversion solution. both devices are similar to the aat3220, with the exception that they offer further power savings with an enable pin. a typical application circuit is shown in figure 1 . the pin configuration i s shown in figure s 2 , 3, and 4. signal pin assignments and functional pin descriptions are provided in table 1 . downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 2 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b figure 1. aat3221/3222 typical application circuit figure 2 . aat3221 pinout 5- pin sot23 -5 (top vie w) figure 3 . aat3221 pinout 8- pin sc70jw -8 (top view) figure 4 . aat3222 pinout 5- pin sot23 -5 (top view) table 1 . aat3221/3222 signal descriptions pin # name description aat3221 aat3222 sot23 -5 sc70jw -8 1 2 2 in input pin. 2 5, 6, 7, 8 1 gn d ground connection pin. 3 4 5 en( en) enable input. logic compatible enable with active high or active low option available; see ordering information and applications informati on for details. 4 3 4 nc not connected. 5 1 3 out output pin; should be decoupled with 1 f or greater capacitor. downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 3 electrical and mechanical specifications the absolute maximum ratings of the aat3221/3222 are provided in table 2. the recommended operating conditions are specified in table 3, and e lectrical specifications are p rovided in table 4 . typical performance characteristics of the aat3221/3222 are illustrated in figures 5 through 22. table 2 . aat3221/3222 absolute maximum ratings (note 1) parameter symbol minimum typical maximum units input voltage, <30 ms, 10% dc (continuous max. = 6.0 v) v in C 0.3 + 7 v en(en) to gnd voltage v e n C 0.3 +6 v maximum en( en ) to input voltage v enin ( max ) 0.3 v maximum dc output current i out p d /(v in C v o ) ma operating junction temperature range t j C 40 + 150 oc thermal r esistance (note 2 ) ja sot23 -5 150 oc/w sc70jw - 8 160 oc/w power dissipation (note 2) p d sot2 3 -5 667 mw sc70jw - 8 625 mw electrostatic discharge: human body model, class 3a esd 4000 v note 1: exposure to maximum rating conditions for extended period s may reduce device reliability. there is no damage to dev ice with only one parameter set at the limit and all other parameters set at or below their nominal value. exceeding any of the limits listed may result in permanent damage to the device. note 2: support in high voltage pulse up to 7 v lasting 8 s. caution : although this device is designed to be as robust as possible, electrosta tic discharge (esd) can damage this device. this devi ce must be protected at all times from esd. static charges may easily prod uce potentials of several kilovolts on the human body or equipment, which can discharge without detection. industry - standard esd precautions should be used at all times. table 3. aat3221/3222 recommended operating conditions parameter symbol minimum typic al maximum units input voltage (note 1) v in (v out + v do ) 5.5 v ambient temperature range t a C 40 +85 c note 1: to calculate minimum input voltage, use the following equation : v in ( min ) = v out ( max ) + v do ( max ) as long as v in 2.5 v. downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 4 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b table 4 . aat3221/3222 electrical specifications (1 of 2) (note 1) (v in = v out ( nom ) + 1 v, i out = 1 m a, c out = 1 f, t a = 25 c, u nless o therwise n oted ) parameter symbol test condition min typical max units dc o utput v oltage t olerance v out C2 .0 + 2.0 % output c urrent i out v out > 1.2 v 150 ma short -c ircuit c urrent i s c v out < 0.4 v 350 ma ground c urrent i q v in = 5 v, no load 1.1 2.5 a shutdown c urrent i sd en = i nactive 20 n a line r egulation ? v out/ v out ? v in v in = 4.0 v to 5.5 v 0.15 0.4 %/v load r egulation ? v out /v out i out = 1 to 100 ma v out = 1.5 1.3 1.72 % v out = 1.6 1.2 1.69 v out = 1.7 1.1 1.67 v out = 1.8 1.0 1.65 v out = 1.9 1.0 1.62 v out = 2.0 0.9 1.58 v out = 2.3 0.8 1.45 v out = 2.4 0.8 1.40 v out = 2.5 0.8 1.35 v out = 2.6 0.8 1.30 v out = 2.7 0.7 1.25 v out = 2.8 0.7 1.20 v out = 2.85 0.7 1.20 v out = 2.9 0.7 1.18 v out = 3.0 0.6 1.15 v out = 3.1 0.6 1.06 v out = 3.3 0.5 1.00 v out = 3.5 0.5 1.00 dropout v oltage (note 2, 3 ) v do i out = 100 ma v out = 2.3 230 275 mv v out = 2.4 220 265 v out = 2.5 210 255 v out = 2.6 205 247 v out = 2.7 200 240 v out = 2.8 190 235 v out = 2.85 190 230 v out = 2.9 190 228 v out = 3.0 190 225 v out = 3.1 188 222 v out = 3.3 180 220 v out = 3.5 180 220 downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 5 table 4 . aat3221/3222 electrical specifications (2 of 2) (note 1) (v in = v out ( nom ) + 1 v, i out = 1 m a, c out = 1 f, t a = 25 c, u nless o therwise n oted) parameter symbol test condition min typical max units en input l ow v oltage v en ( l ) 0.8 v en input high v oltage v en ( h ) v in = 2.7 v to 3.6 v 2.0 v v in = 5 v 2.4 en input l eakage i en ( sink ) v on = 5.5 v 0.01 1 a power s upply r ejection r atio psr r @ 100 h z 50 db over -t emperature s hutdown t hreshold t sd 140 oc over -t emperature s hutdown h ysteresis t hys 20 oc output n oise e n f = 10 hz to 10 khz 350 v rms output v oltage t emperature c oefficient t c 80 ppm/c note 1: performance is gu aranteed only under the conditions listed in this table. note 2: v do is defined as v in - v out when v out is 98% of nominal. note 3 : for v out < 2.3 v, v do = 2.5 v C v out . downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 6 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b typical performance characteristics (v in = v out + 1 v, t a = 25 c , c out = 5.6 f c eramic, i out = 1 m a, u nless o therwise n oted) figure 5 . output voltage vs output current figure 7 . output voltage vs input voltage figure 9 . supply current vs input voltage figure 6. output voltage vs input voltage figure 8 . dropout voltage vs output current figure 1 0 . psrr with 10 ma load downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 7 typical performance characteristics (v in = v out + 1 v, t a = 25 c , c out = 5.6 f ceramic, i out = 1 m a, u nless o therwise n oted) figure 1 1 . noise spectrum figure 1 3 . line response with 10 ma load fi gure 1 5 . load transient ? 1 ma/ 40 ma figure 1 2 . line response with 1 ma load figure 1 4 . line response with 100 ma load figure 16 . load transient ? 1 ma/80 ma downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 8 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b typical performance characteristics (v in = v out + 1 v, t a = 25 c , c out = 5.6 f ceramic , i out = 1 m a, u nless o therwise n oted) figure 17 . power - up with 1 ma load figure 19 . power - up with 10 ma load figure 2 1 . power - up with 100 ma load figure 18 . turn - on with 1 ma load figure 2 0 . turn - on with 10 ma load figure 2 2 . turn - on with 1 00 ma load downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 9 figure 23 . aat3221/3222 functional block diagram functional description the aat3221 and aat3222 are intended for ldo regulator applications where output current load requirements range from no load to 150 ma. the advanced circuit design o f the aat3221/322 2 has been optimized for very low quiescent or ground current consumption, making these devices ideal for use in power management systems for small battery - operated devices. the typical quiescent current level is just 1.1 a. both devices also contain an enable circuit that has been provided to shut down the ldo regulator for additional power conservation in portable products. in the shutdown state, the ldo draws less t han 1 a from the input supply. the ldo also demonstrates excellent p owe r s upply ri pple r ejection (psrr) , and load and line transient response characteristics. the aat3221/3222 high performance ldo regulators are especially well suited for circuit applications that are sensitive to load circuit power consump tion and extended b attery life. the ldo regulator output has been specifically optimized to function with low - cost, low equivalent series resistance ( esr ) ceramic capacitors. however, the design allow s for operation with a wide range of capacitor types. the aat3221/3222 have complete short - circuit and thermal protection. the integral combination of these two internal protection circuits gives each device a comprehensive safety system to guard against extreme adverse operating conditions. device power dissipation is limited to the package type and thermal dissipation properties. refer to the thermal considerations and high output current applications section of this document for details on device operation at maximum output load levels. application information to ensure that th e maximum possible performance is obtained from the aat3221 or aat3222, please refer to the following application recommendations. input capacitor a 1 f or larger capacitor is typically recommended for c in in most applications. a c in capacitor is not required for basic ldo regulator operation. however, if the aat3221/322 2 are physically located more than one or two centimeters from the input power source, a c in capacitor is needed for stable operation. c in should be located as closely to the device v in pin as practically possible. c in values greater than 1 f offer superior input line transient response and helps to maximize the power supply ripple rejection. ceramic, tantalum, or aluminum electrolytic capacitors may be selected for c in , as there is no spec ific capacitor esr requirement. for 150 ma ldo regulator output operation, ceramic capacitors are recommended for c in due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources such as batteries i n portable devices. downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 10 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b output capacitor for proper load voltage regulation and operational stability, a capacitor is required between pins v out and gnd. the c out capacitor connection to the ldo regulator ground pin should be made as direct as practically possible for maximum device performance. the aat3221/322 2 ha ve been specifically designed to function with very low esr ceramic capacitors. although the devices are intended to operate with these low esr capacitors, they are stable over a wide range of capaci tor esr s. therefore, they can also work with some higher esr tantalum or aluminum electrolytic capacitors. however, for best performance, ceramic capacitors are recommended. the value of c out typically ranges from 0.47 f to 10 f; however, 1 f is suffici ent for most operating conditions. if large output current steps are required by an application, then an increased value for c out should be considered. the amount of capacitance needed can be calculated from the step size of the change in output load current expected and the voltage excurs ion that the load can tolerate. the total output capacitance required can be calculated using t he following formula: where: ? i = maximum step of output current ? v = maximum excursion voltage that the load can tolerate no te that use of this equation results in capacitor values approximately two to four times the typical value needed for an aat3221 or aat3222 at room temperature. the increased capacitor value is recommended if tight output tolerances must be maintained over extreme operating conditions and maximum operational temperature excursions. if tantalum or aluminum electrolytic capacitors are used, the capacitor value should be increased to compensate for the substantial esr inherent to thes e capacitor types. capacit or characteristics ceramic composition capacitors are highly recommended over all other types of capacitors for use with the aat3221/322 2. ceramic capacitors offer many advantages over their tantalum and aluminum electrolytic counterparts. a ceramic capaci tor typically has a very low esr, a lower cost, a smaller pcb fo otprint, and is non - polarized. line and load transient response of the ldo regulator is improved by usi ng low - esr ceramic capacitors. since ceramic capacitors are non - polarized, they are less prone to damage if incorrectly connected. equivalent series resistance (esr) esr is a very important characteristic to consider when selecting a capacitor. esr is the internal series resistance associated with a capacitor, which includes lead resistance, internal connections, capacitor size and area, material composition, and ambient temperature. typically, capacitor esr is measured in milli o hms for ceramic capacitors and can range to more than several o hms for tantalum or aluminum electrolytic capacitors. ceramic capacitor materials ceramic capacitors less than 0.1 f are typically m ade from npo or c0g materials. npo and c0g materials have a typically tight tolerance and are very stable over temperature ranges . larger capacitor values are typically composed of x7r, x5r, z5u, and y5v dielectric materials. large ceramic capacitors, typically greater than 2.2 f, are often available in low - cost y5v and z5u dielectrics. these two material types are not recommended for use with ldo regulators since the capacitor tolerance can vary more than 50% over the operating temperature range of the device. a 2.2 f , y5v capacitor could be reduced to 1 f over the full operating temperature range. this can cause problems for circuit operation and stability. x7r and x5r dielectrics are much more desirable. the temperature tolerance of x7r dielectric is better than 15%. capacitor area is another contributor to esr. capacitors that are physically large in size have a lower esr when compared to a smaller sized capacitor of equivalent material and capacitance value. these larger devices can also improve circuit transient response when compared to an equal value capac itor in a smaller package size. consult capacitor vendor d ata s heets carefully when selecting capacitors for use wi th ldo regulators. enable function the aat3221/322 2 devices feature an ldo regulator enable/disable function. this pin (en) is compatible with cmos logic. active high or active low options are available (see ordering information). for a logic high signal, the en control level must be greater than 2.4 v. a logic low signal is asserted when the voltage on the en pin falls below 0.8 v. for example, the active high version s of the aat3221 and aat3222 turns on when a logic high is applied to the en pin. if the enable function is not needed in a specific application, it may be tied to the respective voltage level to keep the ldo regulator in a continuously on state ( e.g., the active high version aat3221/322 2 can tie v in to en to remain on ) . downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 11 short - circuit protec tion and thermal protection the aat3221/2 is protected by both current limit and over - temperature protection circuitry. the internal short - circuit current limit is designed to activate when the output load demand exceeds the maximum rated output. if a shor t- circuit condition was to continually draw more than the current limit threshold, the ldo regulator output voltage drops to a level necessary to supply the current demanded by the load. under short - circuit or other over - current operating conditions, the o utput voltage drops and the device die temperature rapidly increases. once the regulators power dissipation capacity is exceeded and the internal die temperature reaches approximately 140 c, the system thermal protection circuit become s active. the internal thermal protection circuit actively turn s off the ldo regulator output pass device to prevent the possibility of over - temperature damage. the ldo regulator output remain s in a shutdown state until the internal die temperature falls back below the 140 c trip point. the interaction between the short - circuit and thermal protection systems allows the ldo regulator to withstand indefinite short - circuit conditions without sustaining permanent damage. no - load stability the aat3221 and aat322 2 are designed to maintain output voltage regulation and stability under o perational no - load conditions. this is an important characteristic for applications where the output current may drop to zero. an output capacitor is required for stability under no - load operating con ditions. refer to the o utput c apacitor section of this document for recommended typical output capacitor values. thermal considerations and high output current applications the aat3221/322 2 are designed to deliver a continuous output load current of 150 ma under normal operating conditions. the limiting characteristic for the maximum output load safe operating area is essentially package power dissipation and the internal preset thermal limit of the device. t o obtain high operating currents, careful device layout and circuit operating conditions need to be taken into account. the following discussion assume s that the ldo regulator is mounted on a printed circuit board using the minimum recommended footprint , and the printed circuit board is 0.062 - inch thick fr4 material with one ounce copper. at any given ambient temperature (t a ), the maximum package power dissipation can be determined by the following equation: constants for the aat3221/322 2 are t j ( max ) , the maximum junction temperature for the device , whi ch is 125 c , and q ja = 150 c/w, the package thermal resistance. typically, the maximum package power is calculated at the maximum operating temperature where t a = 85 c, and under normal ambient conditions t a = 25 c. given t a = 85 c, the maximum packag e power dissipation is 267 mw. at t a = 25 c, the maximum package power dissipation is 667 mw. the maximum continuous output current for the aat3221/322 2 is a function of the package power dissipation and the input - to - output voltage drop across the ldo reg ulator. refer to the following simple equation: for example, if v in = 5 v, v out = 2.5 v and t a = 25 c, i out ( max ) < 267 ma. the output short - circuit protection threshold is set between 150 ma and 300 ma. if the output load current were to exceed 267 ma or if the ambient temperature were to increase, the internal die temperature would increase. if the condition remained constant and the short - circuit protection did not activate, there would be a potential damage hazard to the ldo regulator since the therma l protection circuit would only activate after a short - circuit event occurred on the ldo regulator output. to determine the maximum input voltage for a given load current, refer to the following equation. this calculation accounts for the total power dissi pation of the ldo regulator, including that caused by ground current. this formula can be solved for v in to determine the maximum input voltage. the following is an example of the aat3221 or aat3222 set for a 2.5 v output: v out = 2.5 v i out = 150 ma i gnd = 1.1 a from the discussion above, p d ( max ) was determined to equal 667 mw at t a = 25 c. th erefore, the aat3221/322 2 can sustain a constant 2.5 v output at a 150 ma load current as long as v in 6.95 v at an ambient temperature of 25 c. the maximum input operating voltage is 5.5 v for the aat3221/322 2 . therefore, at 25 c , the device would not have any thermal concerns or operational v in ( max ) limits. downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 12 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b this situation can be different at 85 c. the following is an example for an aat3221/3222 set for a 2.5 v output at 85 c: v out = 2.5 v i out = 150 ma i gnd = 1.1 a from the discussion above, p d ( max ) was determined to equal 267 mw at t a = 85 c. higher input - to - output voltage differentials can be obtained with the aat3221/322 2, while maintaining device functions in the thermal safe operating area. to accomplish this, the device thermal resistance must be reduced by increasing the heat sink area or by operating the ldo regulator in a duty - cycled mode. for example, an application requires v in = 5.0 v whil e v out = 2.5 v at a 150 ma load and t a = 85 c. v in is greater than 4.28 v, which is the maximum safe continuous input level for v out = 2.5 v at 150 ma for t a = 85 c. to maintain this high input voltage and output current level, the ldo regulator must be operated in a duty - cycled mode. refer to the following calculation for duty - cycle operation: i gnd = 1.1 a i out = 150 ma v in = 5.0 v v out = 2.5 v p d ( max ) is assumed to be 267 mw. for a 150 ma output current and a 2.5 v drop across the aat3221/3222 at an ambient temperature of 85 c, the maximum on - time duty cycle for the device is 71.2%. the following family of curves shows the safe operating area for duty - cycled operation from ambient room temperature to the maximum operating level. figure 24 : devi ce duty cycle vs voltage drop (v out = 2.5 v @ 25 c) figure 25: device duty cycle vs voltage drop (v out = 2.5 v @ 50 c) figure 26: device duty cycle vs v oltage drop (v out = 2.5 v @ 85 c) high peak output current applications some applications requir e the ldo regulator to operate at continuous nominal levels with short duration, high - current peaks. the duty cycles for both output current levels must be taken into account. to do so, one would first need to calculate t he power dissipation at the nominal continuous level, then factor in the addition al power dissipation due to the short duration, high - current peaks. for example, a 2.5 v system using an aat3221/2igv - 2.5 - t1 operates at a continuous 100 ma load current level and has short 150 ma current pea ks . the current peak occurs for 378 s out of a 4.61 ms period. it will be assumed the input voltage is 5.0 v. downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 13 first, the current duty cycle percentage must be calculated: % peak d uty c ycle: x /100 = 378 s/4.61 ms % peak d uty c ycle = 8.2% the ldo regulator is under the 100 ma load for 91.8% of the 4.61 ms period and have 150 ma peaks occurring for 8.2% of the time. next, the continuous nominal power dissipation for the 100 ma load should be determined then multiplied by the duty cycle to conclude the actual p ower dissipation over time. p d ( max ) = (v in C v out ) i out + (v in i gnd ) p d ( 100ma) = (5.0 v C 2.5 v) 100 ma + (5.0 v 1.1 a) p d ( 100ma) = 250 mw p d (91.8%d/c) = %dc p d ( 100ma) p d (91.8%d/c) = 0.918 250 mw p d (91.8%d/c) = 229.5 mw the power dissipation for a 100 ma load occurring for 91.8% of the duty cycle is 229.5 mw. now , the power dissipation for th e remaining 8.2% of the duty cycle at the 150 ma load can be calculated: p d ( max ) = (v in C v out ) i out + (v in i gnd ) p d (150 m a) = (5.0 v C 2.5 v) 150 ma + (5.0 v 1.1 a) p d ( 150ma) = 375 mw p d (8.2%d/c) = %dc p d (150 m a) p d (8.2%d/c) = 0.082 375 mw p d (8.2 %d/c) = 30.75 mw the power dissipation for a 150 ma load occurring for 8.2% of the duty cycle will be 30.75 mw. finally, the two power dissipation levels can be summed to determine the total true power dissipation under the varied load: p d (total) = p d (100 m a) + p d (150 ma) p d (total) = 229.5 mw + 30.75 mw p d (total) = 260.25 mw the maximum power dissipation for the aat3221/3222 operating at an ambient temperature of 85 c is 267 mw. the device in this example has a total power dissipation of 260.25 mw. this i s within the thermal limits for safe operation of the device. printed circuit board layout recommendations t o obtain the maximum performance from the aat3221/322 2 ldo regulator, very careful attention must be considered in regard to the printed circuit board layout. if grounding connections are not properly made, power supply ripple rejection and ldo regulator transient response can be compromised. the ldo regulator external capacitors c in and c out should be connected as directly as possible to the ground pin of the ldo regulator. for maximum performance with the aat3221/322 2, the ground pin connection should then be made directly back to the ground or common of the source power supply. if a direct ground return path is not possible due to printed circuit board layout limitations, the ldo ground pin should then be connected to the common ground p lane in the application layout. evaluation board description the aat3221 evaluation b oard schematic diagram s are provided in figure s 2 7 and 28 . the pcb layout is illu strated in figures 2 9 and 30 . component values for the aat3221 evaluation board s are listed in table s 5 and 6 . package information package dimensions are shown in figures 31 (sot23 - 5) and 3 3 (sc70jw - 8), and tape and reel dimensions are provided in figures 32 (sot23 - 5) and 34 (sc70jw - 8). figure 27 : aat3221 (sot23 - 5) evaluation board schematic downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 14 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b figure 28 : aat3221 ( sc70jw -8) e valuation board schematic figure 29 : aat3221 (sot23 - 5) evaluation board figure 30 : aat3221 (sc70jw -8) evaluation board table 5 . aat3221 ( sot23 -5) evaluatio n board bill of materials (bom) component part number description manufacturer u1 aat3221 igv - xx - t1 150 ma , nano p ower low dropout linear regulator skyworks r 1 rc0603fr - 07100kl res istor , 100 k ? , 1/10w , 1% , 0603 smd yageo c1 , c2 grm 31 mr 71 e 10 5 k c ap ceramic , 1 f , 1206 x7 r, 25 v , 10% murata table 6 . aat3221 (sc70jw -8) evaluatio n board bill of materials (bom) component part number description manufacturer u1 aat3221 ijs - xx - t1 150 ma , nano p ower low dropout linear regulator skywo rks r1,r2 rc0603fr - 07100kl res istor, 100 k ? , 1/10w , 1% , 0603 smd yageo c1 ,c2 grm 31 mr 71 e 10 5 k c ap ceramic , 1 f , 1206 x7 r, 25 v , 10% murata downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 15 figure 31 . aat3221/3222 5- pin sot23 -5 pa ckage dimensions figure 32. aat3221/3222 tape and reel dimensions (sot23 -5) downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 16 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b figure 33 . aat3221 8- pin sc70jw -8 pa ckage dimensions figure 34. aat3221/3222 tape and reel dimensions (sc70jw -8) downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 202251b ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? may 17 , 201 3 17 ordering information output voltage enable package marking (note 1) part number (tape and reel) (note 2) 1.6v active high sot23 -5 gyxyy aat3221igv - 1.6 - t1 1.7v gbxyy aat3221igv - 1.7 - t1 1.8v bbxyy aat3221igv - 1.8 - t1 1.9v cgxyy aat3221igv - 1.9 - t1 2.0v blxyy aat3221igv - 2.0 - t1 2.3v flxyy aat3221igv - 2.3 - t1 2.4v fmxyy aat3221igv - 2.4 - t1 2.5v akxyy aat3221igv - 2.5 - t1 2.6v gpxyy aat3221igv - 2.6 - t1 2.7v gdxyy aat3221igv - 2.7 - t1 2.8v aqxyy aat3221igv - 2.8 - t1 2.85v byxyy aat3221igv - 2.85 - t1 2.9v jcxyy aat3221igv - 2.9 - t1 3.0v alxyy aat3221igv - 3.0 - t1 3.1v gvxyy aat3221igv - 3.1 - t1 3.3v amxyy aat3221igv - 3.3 - t1 1.5v sc70jw - 8 cfxyy aat3221ijs - 1.5 - t1 1.6v aat3221ijs - 1.6 - t1 1.7v aat3221ijs - 1.7 - t1 1.8v bbxyy aat3221ijs - 1.8 - t1 1.9v cgxyy aat3221ijs - 1.9 - t1 2.0v blxyy aat3221ijs - 2.0 - t1 2.3v flxyy aat3221ijs - 2.3 - t1 2.4v fmxyy aat3221ijs - 2.4 - t1 2.5v akxyy aat3221ijs - 2.5 - t1 2.6v gpxyy aat3221ijs - 2.6 - t1 2.7v gdxyy aat3221ijs - 2.7 - t1 2.8v aqxyy aat3221ijs - 2.8 - t1 2.85v byxyy aat3221ijs - 2.85 - t1 2.9v jcxyy aat3221ijs - 2.9 - t1 3.0v alxyy aat3221ijs - 3.0 - t1 3.1v gvxyy aat3221ijs - 3.1 - t1 3.2v lexyy aat3221ijs - 3.2 - t1 3.3v amxyy aat3221ijs - 3.3 - t1 3.5v bmxyy aat3221ijs - 3.5 - t1 2.8v sot23 -5 bixyy aat3222igv - 2.8 - t1 2.9v aat3222igv - 2.9 - t1 2.8v active low cxxyy aat3221igv - 2.8 - 2 t1 note 1: xyy = assembly and date code. note 2: sample stock is generally held on part numbers listed in bold . downloaded from: http:///
data sheet ? aat3221/ aat 3222 150 m a nanopower tm ldo linear regulator skyworks solutions, inc. ? phone [781] 376 - 3000 ? fax [781] 376 - 3100 ? sales@skyworksinc.com ? www.skyworksinc.com 18 may 17 , 201 3 ? skyworks proprietary information ? products and product inform ation are subject to change without notice ? 202 251b copyright ? 2013 skyworks solutions, inc. all rights reserved. information in this document is provided in connection with sk yworks solutions, inc. (skyworks) products or service s. these materials, including the information contained her ein, are provided by skyworks as a service to its customers and may be used for informati onal purposes only by the customer. skyworks assumes no r esponsibility for errors or omissions in t hese materials or the information contained herein. skyworks may change its docu mentation, products, services, specifications or product descriptio ns at any time, without notice. skyworks makes no commitment to update the materials or information and shall have no responsibility whatsoever for conflicts, incompatibilitie s, or other difficulties arising from any future changes. no license, whether express, implied, by estoppel or other wise, is granted to any intellectual property rights by this docume nt. sky works assumes no liability for any materials, products or information provided hereunder, including the sale, distribution, reproduction or use of skyworks products, information or materials, except as may be provided in skyworks ter ms and conditions of sa le. the materials, products and information are provided as is without warranty of any kind, whether express, implie d, statutor y, or otherwise, including fitness for a particular purpose or use, merchantability, performance, quality or non - infringement o f any intellectual property right; all such warranties are hereby expressly disclaimed. skyworks does not warrant the accuracy or co mpleteness of the information, text, graphics or other ite ms contained within these materials. skyworks shall not be liable for any damages, including 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 u se 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 fa ilure of the skyworks products could lead to personal inju ry, death, physical or environmental damage. skyworks custome rs using or selling skyworks products for use in such a pplications do so at their own risk and agree to fully indemn ify skyworks for any damages resulting from such improper use or s ale. customers are responsible for their products and applicat ions using skyworks products, which may deviate from pu blished speci fications as a result of design defects, errors, or operation of products outside of published parameters or design spec ifications. customers should include design and operating s afeguards to minimize these and other risks. skyworks as sumes no liabili ty for applications assistance, customer product design, or dama ge to any equipment resulting from the use of skyworks p roducts outside of stated published specifications or param eters. skyworks, the skyworks symbol, and breakthrough simplicity are t rademarks or registered trademarks of skyworks solutions, i nc., in the united states and other countries. third - party brands and names are for identification purposes only, and are t he property of their respective owners. additional inform ation, including rele vant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference. downloaded from: http:///

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