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1 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 general description the aat1149b switchreg is a 2.2mhz step-down con- verter with an input voltage range of 2.2v to 5.5v. it is optimized to react quickly to load variations and operate with a tiny 0603 inductor that is only 1mm tall. the aat1149b can deliver 400ma of load current while maintaining a low 45 a no load quiescent current. the 2.2mhz switching frequency minimizes the size of exter- nal components while keeping switching losses low. the aat1149b maintains high efficiency throughout the operating range, which is critical for portable applica- tions. the aat1149b is available in a pb-free, space-saving 5-pin wafer-level chip scale (wlcsp) package and is rated over the -40c to +85c temperature range. features ? ultra-small 0603 inductor (height = 1mm) ? v in range: 2.2v to 5.5v ? v out fixed 1.8v ? 400ma max output current ? up to 98% efficiency ? 45 a no load quiescent current ? 2.2mhz switching frequency ? 70 s soft start ? fast load transient ? over-temperature protection ? current limit protection ? 100% duty cycle low-dropout operation ? <1 a shutdown current ? 0.91 x 1.235mm wlcsp package ? temperature range: -40c to +85c applications ? cellular phones ? digital cameras ? handheld instruments ? microprocessor / dsp core / io power ? pdas and handheld computers ? usb devices typical application l1 2.2h c1 4.7f v out = 1.8v v in = 3.6v c2 4.7f en fb in lx agnd pgnd pgnd pgnd aat1149b u1
2 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 pin descriptions pin # symbol function 1 fb feedback input pin. connect this pin ito the converted output voltage node. 2 en enable pin. 3 agnd non-power signal ground pin. pgnd main power ground return pins. connect to the output and input capacitor return. 4 in input supply voltage for the converter. 5lx switching node. connect the inductor to this pin. it is internally connected to the drain of both high- and low-side mosfets. pin configuration wlcsp-5 (top view) a gnd/pgnd in fb lx en 12 4 3 5
3 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 absolute maximum ratings 1 symbol description value units v in input voltage to gnd 6.0 v v lx lx to gnd -0.3 to v in + 0.3 v v fb fb to gnd -0.3 to v in + 0.3 v v en en to gnd -0.3 to 6.0 v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c thermal information symbol description value units p d maximum power dissipation 2, 3 352 mw ? ja thermal resistance 2 284 c/w 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. only one absolute maximum rating should be applied at any one time. 2. mounted on an fr4 board; use the nsmd (none-solder mask defined) pad style for tighter control on the copper etch process. 3. derate 3.52 mw/c above 25c.
4 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 electrical characteristics 1 v in = 3.6v, t a = -40c to +85c, unless otherwise noted. typical values are t a = 25c. symbol description conditions min typ max units step-down converter v in input voltage 2.2 5.5 v v out output voltage tolerance i out = 0 to 400ma, v in = 2.7v to 5.5v -3.0 3.0 % i q quiescent current no load 45 70 a i shdn shutdown current v en = gnd 1.0 a i lim p-channel current limit 600 ma r ds(on)h high side switch on resistance 0.40 ? r ds(on)l low side switch on resistance 0.35 ? i lxleak lx leakage current v in = 5.5v, v lx = 0 to v in , v en = gnd 1 a ? v linereg line regulation v in = 2.7v to 5.5v 0.1 %/v t s start-up time from enable to output regulation 70 s f osc oscillator frequency t a = 25c 2.2 mhz t sd over-temperature shutdown threshold 140 c t hys over-temperature shutdown hysteresis 15 c en v en(l) enable threshold low 0.6 v v en(h) enable threshold high 1.4 v i en input low current v in = v out = 5.5v -1.0 1.0 a 1. the aat1149b is guaranteed to meet performance specifications over the -40c to +85c operating temperature range and is ass ured by design, characterization, and cor- relation with statistical process controls.
5 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 typical characteristics efficiency vs. output current (v out = 1.8v; l = 1.5h) output current (ma) efficiency (%) 0 10 20 30 40 50 60 70 80 90 100 1000 100 10 1 0.1 v in = 5.5v v in = 5v v in = 4.2v v in = 3.6v v in = 3v v in = 2.7v v in = 2.3v load regulation (v out = 1.8v; l = 1.5h) output current (a) output error (%) -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 10000 1000 100 10 1 0.1 v in = 5.5v v in = 5v v in = 4.2v v in = 3.6v v in = 3v v in = 2.7v v in = 2.3v no load quiescent current vs. input voltage input voltage (v) supply current (a) 6 5 4 3 2.5 3.5 4.5 5.5 1 1.5 2 2.5 3 3.5 4 4.5 5 t = 85c t = 25c t = -40c frequency variation vs. input voltage (v out = 1.8v) input voltage (v) frequency variation (%) -4 -3 -2 -1 0 1 2 2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5 switching frequency variation vs. temperature temperature ( c) variation (%) -10 -8 -6 -4 -2 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 120 output voltage error vs. temperature (v in = 3.6v; v o = 1.8v; i out = 400ma) temperature ( c) output error (%) -2.0 -1.0 0.0 1.0 2.0 -40 -20 0 20 40 60 80 100
6 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 typical characteristics line regulation (v out = 1.8v) input voltage (v) accuracy (%) -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 2.5 3 3.5 4 4.5 5 5.5 6 400ma 600ma 0ma 100ma line transient (v out = 1.8v; v in = 3.6v to 4.2v) time (200s/div) input voltage (top) (1v/div) output voltage (bottom) (20mv/div) 0 1 2 3 4 5 -0.02 0 0.02 0.04 line transient (v out = 1.8v; no load) time (50s/div) input voltage (top) (v) output voltage (bottom) (v) 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 1.78 1.80 1.82 1.84 1.86 1.88 1.90 1.92 1.94 n-channel r ds(on) vs. input voltage (wlcsp-5) input voltage (v) r ds(on) (m ) 250 300 350 400 450 500 550 600 650 700 750 2.5 3 3.5 4 4.5 5 5.5 6 120 c 100 c 85 c 25 c p-channel r ds(on) vs. input voltage (wlcsp-5) input voltage (v) r ds(on) (m ) 250 300 350 400 450 500 550 600 650 700 750 2.5 3 3.5 4 4.5 5 5.5 6 25 c 85 c 120 c 100 c step-down converter load transient response (v in = 3.6v; v out = 1.8v; i out = 40ma to 400ma; c out = 4.7f) time (100s/div) output current (top) (a) output voltage (ac coupled) (bottom) (v) 1.4 1.6 1.8 2.0 2.2 0.0 0.2 0.4 0.6 400ma 40ma
7 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 typical characteristics soft start (v out = 1.8v) time (50s/div) inductor current (bottom) (250ma/div) enable and output voltage (top) (v) -4.00 -3.00 -2.00 -1.00 0.00 1.00 2.00 3.00 4.00 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
8 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 functional description the aat1149b is a high performance 400ma 2.2mhz monolithic step-down converter. it minimizes external component size, enabling the use of a tiny 0603 inductor that is only 1mm tall, and is optimized for low noise. apart from the small bypass input capacitor, only a small l-c filter is required at the output. typically, a 1.8 h inductor and a 4.7 f ceramic capacitor are recommend- ed (see table of values). only three external power components (c in , c out , and l) are required. output voltage is fixed internally. at dropout, the converter duty cycle increases to 100% and the output voltage tracks the input voltage minus the r ds(on) drop of the p-channel high-side mosfet. the input voltage range is 2.2v to 5.5v. the converter efficiency has been optimized for all load conditions, ranging from no load to 400ma. the internal error amplifier and compensation provides excellent transient response, load, and line regulation. soft start eliminates any output voltage overshoot when the enable or the input voltage is applied. functional block diagram en lx err . amp logic dh dl pgnd in voltage reference input fb agnd
9 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 control loop the aat1149b is a peak current mode step-down con- verter. the current through the p-channel mosfet (high side) is sensed for current loop control, as well as short circuit and overload protection. a fixed slope compensa- tion signal is added to the sensed current to maintain stability for duty cycles greater than 50%. the peak cur- rent mode loop appears as a voltage-programmed cur- rent source in parallel with the output capacitor. the output of the voltage error amplifier programs the current mode loop for the necessary peak switch current to force a constant output voltage for all load and line conditions. internal loop compensation terminates the transconductance voltage error amplifier output. for the adjustable output, the error amplifier reference is fixed at 0.6v. soft start / enable soft start limits the current surge seen at the input and eliminates output voltage overshoot. when pulled low, the enable input forces the aat1149b into a low-power, non-switching state. the total input current during shut- down is less than 1 a. current limit and over-temperature protection for overload conditions, the peak input current is limit- ed. to minimize power dissipation and stresses under current limit and short-circuit conditions, switching is terminated after entering current limit for a series of pulses. switching is terminated for seven consecutive clock cycles after a current limit has been sensed for a series of four consecutive clock cycles. thermal protection completely disables switching when internal dissipation becomes excessive. the junction over-temperature threshold is 140c with 15c of hys- teresis. once an over-temperature or over-current fault conditions is removed, the output voltage automatically recovers. applications information inductor selection the step-down converter uses peak current mode con- trol with slope compensation to maintain stability for duty cycles greater than 50%. the output inductor value must be selected so the inductor current down slope meets the internal slope compensation requirements. a 2.2 h inductor is recommended for a 1.875v output. manufacturer?s specifications list both the inductor dc current rating, which is a thermal limitation, and the peak current rating, which is determined by the satura- tion characteristics. the inductor should not show any appreciable saturation under normal load conditions. some inductors may meet the peak and average current ratings yet result in excessive losses due to a high dcr. always consider the losses associated with the dcr and its effect on the total converter efficiency when selecting an inductor. the 2.2 h cbc2518 series inductor selected from taiyo yuden has a 130mw dcr and a 890ma saturation cur- rent rating. at full load, the inductor dc loss is 21mw which gives a 2.8% loss in efficiency for a 400ma, 1.875v output. input capacitor select a 4.7 f to 10 f x7r or x5r ceramic capacitor for the input. to estimate the required input capacitor size, determine the acceptable input ripple level (v pp ) and solve for c. the calculated value varies with input voltage and is a maximum when v in is double the output voltage. ?? 1 - ?? v o v in c in = v o v in ?? - esr f s ?? v pp i o ?? 1 - = for v in = 2 v o ?? v o v in v o v in 1 4 c in(min) = 1 ?? - esr 4 f s ?? v pp i o always examine the ceramic capacitor dc voltage coef- ficient characteristics when selecting the proper value. for example, the capacitance of a 10 f, 6.3v, x5r ceram- ic capacitor with 5.0v dc applied is actually about 6 f.
10 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 the maximum input capacitor rms current is: ?? i rms = i o 1 - ?? v o v in v o v in the input capacitor rms ripple current varies with the input and output voltage and will always be less than or equal to half of the total dc load current. ?? 1 - = d (1 - d) = 0.5 2 = ?? v o v in v o v in 1 2 for v in = 2 v o i o rms(max) i 2 = the term ?? 1 - ?? v o v in v o v in appears in both the input voltage rip- ple and input capacitor rms current equations and is a maximum when v o is twice v in . this is why the input voltage ripple and the input capacitor rms current ripple are a maximum at 50% duty cycle. the input capacitor provides a low impedance loop for the edges of pulsed current drawn by the aat1149b. low esr/esl x7r and x5r ceramic capacitors are ideal for this function. to minimize stray inductance, the capacitor should be placed as closely as possible to the ic. this keeps the high frequency content of the input current localized, minimizing emi and input voltage ripple. the proper placement of the input capacitor (c2) can be seen in the evaluation board layout in figure 1. a laboratory test set-up typically consists of two long wires running from the bench power supply to the evalu- ation board input voltage pins. the inductance of these wires, along with the low-esr ceramic input capacitor, can create a high q network that may affect converter performance. this problem often becomes apparent in the form of excessive ringing in the output voltage dur- ing load transients. errors in the loop phase and gain measurements can also result. since the inductance of a short pcb trace feeding the input voltage is significantly lower than the power leads from the bench power supply, most applications do not exhibit this problem. in applications where the input power source lead induc- tance cannot be reduced to a level that does not affect the converter performance, a high esr tantalum or alu- minum electrolytic should be placed in parallel with the low esr, esl bypass ceramic. this dampens the high q network and stabilizes the system. output capacitor the output capacitor limits the output ripple and pro- vides holdup during large load transitions. a 4.7 f to 10 f x5r or x7r ceramic capacitor typically provides sufficient bulk capacitance to stabilize the output during large load transitions and has the esr and esl charac- teristics necessary for low output ripple. the output voltage droop due to a load transient is dom- inated by the capacitance of the ceramic output capaci- tor. during a step increase in load current, the ceramic output capacitor alone supplies the load current until the loop responds. within two or three switching cycles, the loop responds and the inductor current increases to match the load current demand. the relationship of the output voltage droop during the three switching cycles to the output capacitance can be estimated by: c out = 3 i load v droop f s once the average inductor current increases to the dc load level, the output voltage recovers. the above equa- tion establishes a limit on the minimum value for the output capacitor with respect to load transients. the internal voltage loop compensation also limits the minimum output capacitor value to 4.7 f. this is due to its effect on the loop crossover frequency (bandwidth), phase margin, and gain margin. increased output capac- itance will reduce the crossover frequency with greater phase margin. the maximum output capacitor rms ripple current is given by: 1 23 v out (v in(max) - v out ) rms(max) i l f s v in(max) = dissipation due to the rms current in the ceramic output capacitor esr is typically minimal, resulting in less than a few degrees rise in hot-spot temperature.
11 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 figure 1: aat1149biuv evaluation board figure 2: aat1149biuv evaluation board top side. bottom side. v in v out c1 4.7f c3 open l1 u1 wlcsp-5 in 4 2 1 5 3 lx fb gnd en en aat1149biuv c2 4.7f r2 open r1 0 figure 3: aat1149biuv evaluation board schematic. thermal calculations there are three types of losses associated with the aat1149b step-down converter: switching losses, con- duction losses, and quiescent current losses. conduction losses are associated with the r ds(on) characteristics of the power output switching devices. switching losses are dominated by the gate charge of the power output switching devices. at full load, assuming continuous con- duction mode (ccm), a simplified form of the losses is given by: p total i o 2 (r ds(on)h v o + r ds(on)l [v in - v o ]) v in = + (t sw f s i o + i q ) v in i q is the step-down converter quiescent current. the term t sw is used to estimate the full load step-down con- verter switching losses.
12 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 for the condition where the step-down converter is in dropout at 100% duty cycle, the total device dissipation reduces to: p total = i o 2 r ds(on)h + i q v in since r ds(on) , quiescent current, and switching losses all vary with input voltage, the total losses should be inves- tigated over the complete input voltage range. given the total losses, the maximum junction tempera- ture can be derived from the ? ja for the wlcsp-8 pack- age which is 284c/w. t j(max) = p total ja + t amb wlcsp package light sensitivity the electrical performance of the wlcsp package can be adversely affected by exposing the device to certain light sources such as direct sunlight or a halogen lamp whose wavelengths are red and infra-reds. however, fluores- cent lighting has very little effect on the electrical perfor- mance of the wlcsp package. layout the suggested pcb layout for the aat1149b is shown in figures 1 and 2. the following guidelines should be used to help ensure a proper layout. 1. the input capacitor (c2) should connect as closely as possible to in (pin 4) and pgnd (pin 3). 2. c1 and l1 should be connected as closely as possi- ble. the connection of l1 to the lx pin should be as short as possible. 3. the feedback trace or fb pin (pin 1) should be sepa- rate from any power trace and connect as closely as possible to the load point. sensing along a high- current load trace will degrade dc load regulation. 4. the resistance of the trace from the load return to the pgnd (pin 3) should be kept to a minimum. this will help to minimize any error in dc regulation due to differences in the potential of the internal signal ground and the power ground. 5. the pad on the pcb for the wlcsp-5 package should use nsmd (non-solder mask defined) configuration due to its tighter control on the copper etch process. a pad thickness of less than 1oz is recommended to achieve higher stand-off.
13 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 step-down converter design example specifications v o = 1.8v @ 400ma (adjustable using 0.6v version), pulsed load ? i load = 300ma v in = 2.7v to 4.2v (3.6v nominal) f s = 2.2mhz t amb = 85c 1.8v output inductor l1 = 1 v o = 1 1.8v = 1.8h s a s a (use 2.2 h) for taiyo yuden inductor cbc2518t2r2m, 2.2 h, dcr = 130m ? . v o v o 1.8 v 1.8v i l1 = 1 - = 1 - = 214m a l1 f s v in 2.2h 2.2mhz 4.2v i pkl1 = i o + i l1 = 0.4a + 0.107a = 0.507a 2 p l1 = i o 2 dcr = 0.4a 2 130m = 21mw 1.8v output capacitor v droop = 0.1v 1 23 1 1.8v (4.2v - 1.8v) 2.2h 2.2mhz 4.2v 23 rms i l1 f s v in(max) = 3 i load v droop f s 3 0.3a 0.1v 2.2mhz c out = = = 4.1f; use 4.7f = 62marms (v o ) (v in(max) - v o ) = p esr = esr i rms 2 = 5m (62ma) 2 = 19w
14 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 input capacitor input ripple v pp = 10mv c in = = = 5.7f; use 4.7f 1 - esr 4 f s v pp i o 1 - 5m 4 2.2mhz 10mv 0.4a i o rms i p = esr i rms 2 = 5m (0.2a) 2 = 0.2mw 2 = = 0.2arms aat1149b losses (wlcsp-5 package) p total + (t sw f s i o + i q ) v in i o 2 (r ds(on)h v o + r ds(on)l [v in -v o ] ) v in = = + (5ns 2.2mhz 0.4a + 3ma) 4.2v = 149mw 0.4 2 (0.725 1.8v + 0.7 [4.2v - 1.8v]) 4.2v t j(max) = t amb + ja p loss = 85 c + (284 c/w) 149mw = 127 c
15 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 manufacturer part number/type inductance ( h) rated current (ma) dcr (m ? ) size (mm) lxwxh taiyo yuden brl2012 2.2 550 250 0805 (h max = 1mm) cbc2518 wire wound chip 2.2 890 130 2.5x1.8x1.8 sumida cdrh2d09 shielded 2.5 440 150 3.2x3.2x1.0 murata lqm2mpn2r2ngol unshielded 2.2 1200 110 2.0x1.6x0.95 coiltronics sd3118 shielded 2.2 510 116 3.15x3.15x1.2 table 1: typical surface mount inductors. manufacturer part number value voltage temp. co. case murata grm219r61a475ke19 4.7 f 10v x5r 0805 murata grm21br60j106ke19 10 f 6.3v x5r 0805 murata grm185r60j475m 4.7 f 6.3v x58 0603 table 2: surface mount capacitors. 1. for reduced quiescent current, r2 = 221k ? .
16 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 ordering information output voltage 1 package marking part number (tape and reel) 2 1.875 wlcsp-5 zzyw 3 aat1149biuv-1.8-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 wlcsp-5 0.910 0.400 bsc 1.235 + + + all dimensions in millimeters. 1. contact sales for other voltage options. 2. sample stock is generally held on part numbers listed in bold . 3. yw = date code (year, week) for wlcsp-5 package.
17 aat1149 b 2.2mhz fast transient 400ma step-down converter data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201989b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 copyright ? 2012, 2013 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.

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