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1 aat115 1 850khz 700ma s y nchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 general description the aat1151 switchreg? is a step-down switching con- verter ideal for applications where high efficiency is required over the full range of output load conditions. the 2.7v to 5.5v input voltage range makes the aat1151 ideal for single-cell lithium-ion/polymer battery applica- tions. capable of more than 700ma with internal mosfets, the current-mode controlled ic provides high efficiency using synchronous rectification. fully inte- grated compensation simplifies system design and low- ers external parts count. the device operates at a fixed 850khz switching fre- quency and enters pulse frequency modulation (pfm) mode for light load current to maintain high efficiency across all load conditions. the aat1151 is available in pb-free msop-8 and qfn33- 16 packages and is rated over the -40c to +85c tem- perature range. features ? v in range: 2.7v to 5.5v ? up to 95% efficiency ? high initial accuracy 1% ? 110m ? r ds(on) internal switches ? <1 a shutdown current ? 850khz switching frequency ? fixed v out or adjustable v out ? 1.0v ? integrated power switches ? synchronous rectification ? current mode operation ? internal compensation ? stable with ceramic capacitors ? pfm for optimum efficiency for all load conditions ? internal soft start ? over-temperature protection ? current limit protection ? msop-8 and qfn33-16 packages ? -40c to +85c temperature range applications ? cellular phones ? digital cameras ? mp3 players ? notebook computers ? pdas ? usb-powered equipment ? wireless notebook adapters typical application output 3.0 h 2x 22 f 10 f 0.1 f 100 lx vp input fb sgnd aat1151 enable vcc pgnd
2 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 pin descriptions pin # symbol function msop-8 qfn33-16 14fb feedback input pin. this pin is connected to the converter output. it is used to set the output of the converter to regulate to the desired value via an internal resistive divider. for an ad- justable output, an external resistive divider is connected to this pin on the 1v model. 2 5, 6 sgnd signal ground. connect the return of all small signal components to this pin. (see board lay- out rules.) 37en enable input pin. a logic high enables the converter; a logic low forces the aat1151 into shut- down mode reducing the supply current to less than 1 a. the pin should not be left oating. 4 9 vcc bias supply. supplies power for the internal circuitry. connect to input power via low pass lter with decoupling to sgnd. 5 10, 11, 12 vp input supply voltage for the converter power stage. must be closely decoupled to pgnd. 6, 7 13, 14, 15 lx connect inductor to these pins. switching node internally connected to the drain of both high- and low-side mosfets. 8 1, 2, 3 pgnd main power ground return pin. connect to the output and input capacitor return. (see board layout rules.) 8, 16 nc not internally connected. ep exposed paddle (bottom); connect to pgnd directly beneath package pin configuration msop-8 qfn33-16 (top view) (top view) 1 2 lx pgnd lx vp fb sgnd en vcc 1 2 3 4 8 7 6 5 vp vp vp nc pgnd pgnd pgnd 1 2 3 4 sgnd sgnd en 16 15 14 13 5 6 7 8 12 11 10 9 nc vcc lx lx lx fb
3 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at co nditions other than the operating conditions specified is not implied. only one absolute maximum rating should be applied at any one time. 2. human body model is a 100pf capacitor discharged through a 1.5k ? resistor into each pin. 3. mounted on a demo board. 4. derate 6.7mw/c above 25c. 5. derate 20mw/c above 25c. absolute maximum ratings 1 symbol description value units v cc , v p vcc, vp to gnd 6v v lx lx to gnd -0.3 to v p + 0.3 v v fb fb to gnd -0.3 to v cc + 0.3 v v en en to gnd -0.3 to 6 v t j operating junction temperature range -40 to 150 c v esd esd rating 2 - hbm 3000 v thermal characteristics 3 symbol description value units ? ja thermal resistance msop-8 150 c/w qfn33-16 50 p d maximum power dissipation (t a = 25c) msop-8 4 667 mw qfn33-16 5 2.0 w recommended operating conditions symbol description value units t ambient temperature range -40 to 85 c
4 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 1. the aat1151 is guaranteed to meet performance specifications over the -40c to +85c operating range and is assured by desig n, characterization, and correlation with sta- tistical process controls. electrical characteristics 1 v in = v cc = v p = 5v, t a = -40c to 85c, unless otherwise noted. typical values are at t a = 25c. symbol description conditions min typ max units v in input voltage range 2.7 5.5 v v out output voltage tolerance v in = v out + 0.2 to 5.5v, i out = 0 to 700ma -3.0 +3.0 % v uvlo under-voltage lockout v in rising 2.5 v v in falling 1.2 v uvlo(hys) under-voltage lockout hysteresis 250 mv i il input low current v in = v fb = 5.5v 1.0 a i ih input high current v in = v fb = 0v 1.0 a i q quiescent supply current no load, v fb = 0v, v in = 4.2v, t a = 25c 210 300 a i shdn shutdown current v en = 0v, v in = 5.5v 1.0 a i lim current limit t a = 25c 1.2 a r ds(on)h high side switch on resistance t a = 25c 110 150 m ? r ds(on)l low side switch on resistance t a = 25c 100 150 m ? ? ef ciency i out = 300ma, v in = 3.5v 92 % ? v out (v out * ? v in ) load regulation v in = 4.2v, i load = 0 to 700ma ? 0.9 % ? v out /v out line regulation v in = 2.7v to 5.5v ? 0.1 %/v f osc oscillator frequency t a = 25c 600 850 1200 khz v en(l) enable threshold low 0.6 v v en(h) enable threshold high 1.4 v t sd over-temperature shutdown threshold 140 c t hys over-temperature shutdown hysteresis 15 c
5 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 typical characteristics efficiency vs. load current (v out = 2.5v; l = 4.2 h) output current (ma) efficiency (%) 50 60 70 80 90 100 1 10 100 1000 efficiency vs. load current (v out = 1.8v) 50 60 70 80 90 100 1 10 100 1000 load current (ma) efficiency (%) 2.7v 3.6v 4.2v no load supply current vs. input voltage 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) supply current ( a) 0 50 100 150 200 250 300 t = 85 c t = -40 c t = 25 c frequency vs. input voltage 850 860 870 880 890 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) frequency (khz) output voltage vs. temperature 1.78 1.782 1.784 1.786 1.788 1.79 1.792 1.794 -40 -20 0 20 40 60 80 100 temperature ( c) output voltage (v) load and line regulation load current (ma) v out error (%) -3.0 -2.0 -1.0 0.0 1.0 2.0 3.0 1 10 100 1000 v in = 3.6v v in = 4.2v v in = 2.7v
6 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 typical characteristics switching frequency vs. temperature 0 200 400 600 800 1000 1200 -40 -20 0 20 40 60 80 100 temperature ( c) frequency (khz) output ripple 1.8v, 50ma, v in = 3.6v circuit of figure 1 time (2 s/div) output voltage (ac coupled) (top) (mv) inductor current (bottom) (a) -60 -50 -40 -30 -20 -10 0 10 20 -0.2 0 0.2 0.4 0.6 0.8 1 1.2 1.4 line transient response 1.8v, 50ma circuit of figure 1 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 time (20 s/div) input voltage (top) (v) -40 -20 0 20 40 60 80 100 120 output voltage (bottom) (mv) output ripple 1.8v, 0.7a, v in = 3.6v circuit of figure 1 time (2 s/div) output voltage (ac coupled) (top) (mv) inductor current (bottom) (a) -60 -50 -40 -30 -20 -10 0 10 20 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 line transient response 1.8v, 0.7a circuit of figure 1 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4 time (20 s/div) input voltage (top) (v) -40 -20 0 20 40 60 80 100 120 output voltage (bottom) (mv) load transient response 50ma to 0.7a v in = 3.6v ? ? circuit of figure 1 time (200 -120 -100 -80 -60 -40 -20 0 20 40 -0.5 0 0.5 1 1.5 2 2.5 3 3.5
7 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 typical characteristics soft start 1.8v, 0.7a, v in = 3.6v circuit of figure 1 time (200 s/div) enable (top) output (middle) (v) inductor current (bottom) (a) -4 -3 -2 -1 0 1 2 3 4 -0.5 0 0.5 1 1.5 2 2.5 3 3.5 output ripple circuit of figure 1 0 5 10 15 20 1 10 100 1000 output current (ma) ripple (mv) v in = 2.7v v in = 3.6v v in = 4.2v
8 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 operation control loop the aat1151 is a peak current mode buck converter. the inner wide bandwidth loop controls the peak current of the output inductor. the output inductor current is sensed through the p-channel mosfet (high side) and is also used for short-circuit and overload protection. a fixed slope compensation signal is added to the sensed current to maintain stability. the loop appears as a volt- age programmed current source in parallel with the out- put capacitor. the voltage error amplifier output programs the current loop for the necessary inductor current to force a con- stant output voltage for all load and line conditions. the voltage feedback resistive divider is internal, dividing the output voltage to the error amplifier reference voltage of 1.0v. the voltage error amplifier does not have the large dc gain typical of most error amplifiers. this eliminates the need for external compensation components, while still providing sufficient dc loop gain for load regulation. the voltage loop crossover frequency and phase margin are set by the output capacitor value only. pfm/pwm operation light load efficiency is maintained by way of pfm control. the aat1151 pfm control forces the peak inductor cur- rent to a minimum level regardless of load demand. at medium to high load demand, this has no effect on cir- cuit operation and normal pwm controls take over. pfm reduces the switching frequency at light loads, thus reducing the associated switching losses. soft start/enable soft start increases the inductor current limit point in discrete steps when the input voltage or enable input is applied. it limits the current surge seen at the input and eliminates output voltage overshoot. when pulled low, the enable input forces the aat1151 into a low-power, non-switching state. the total input current during shut- down is less than 1 a. functional block diagram vp = 2.7v to 5.5v vcc en sgnd pgnd logic 1.0v ref temp. sensing osc op. amp lx fb dh dl cmp 1m
9 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 power and signal source separate small signal ground and power supply pins isolate the internal control circuitry from the noise asso- ciated with the output mosfet switching. the low pass filter r1 and c2 in schematic figure 1 filters the noise associated with the power switching. current limit and over-temperature protection for overload conditions, the peak input current is limit- ed. as load impedance decreases and the output voltage falls closer to zero, more power is dissipated internally, raising the device temperature. thermal protection com- pletely disables switching when internal dissipation becomes excessive, protecting the device from damage. the junction over-temperature threshold is 140c with 10c of hysteresis. inductor the output inductor is selected to limit the ripple current to some predetermined value, typically 20% to 40% of the full load current at the maximum input voltage. 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. during overload and transient conditions, the average current in the inductor can meet or exceed the current limit point of the aat1151. these conditions can tolerate greater saturation in the inductor without degradation in converter performance. 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 con- verter efficiency when selecting an inductor. for a 1.0a load and the ripple set to 40% at the maxi- mum input voltage, the maximum peak-to-peak ripple current is 280ma. the inductance value required is 2.84 h. l = ? 1 - v out v out i o ? k ? f s v in = ? 1 - 1.5v 1.5v 1a ? 0.4 ? 850khz 4.2v ?? ?? ?? ? ? ?? ? ? = 2.84 h the factor ?k? is the fraction of full load selected for the ripple current at the maximum input voltage. for ripple current at 40% of the full load current, the peak current will be 120% of full load. selecting a standard value of 3.0 h gives 38% ripple current. a 3.0 h inductor select- ed from the sumida cdrh5d28 series has a 24m ? dcr and a 2.4a dc current rating. at full load, the inductor dc loss is 24mw, which amounts to a 1.6% loss in effi- ciency. l1 3.3h c3, c4 2x22f c1 10f r1 100 c2 0.1f c1 murata 10f 6.3v x5r grm42-6x5r106k6.3 c3-c4 murata 22f 6.3v grm21br60j226me39l x5r 0805 l1 sumida cdrh3d16-4r7nc or cdrh3d16-3r3nc r2 100k 1.8v 2.7v-4.2v fb 1 sgnd 2 en 3 vcc 4 lx 6 lx 7 pgnd 8 vp 5 u1 aat1151-msop efficiency vs. load current (v out = 1.8v) 50 60 70 80 90 100 1 10 100 1000 load current (ma) efficiency (%) 2.7v 3.6v 4.2v figure 1: aat1151 evaluation board.
10 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 input capacitor the primary function of the input capacitor is to provide a low impedance loop for the edges of pulsed current drawn by the aat1151. a low esr/esl ceramic capacitor is ideal for this function. to minimize stray inductance, the capacitor should be placed as close as possible to the ic. this keeps the high frequency content of the input current localized, minimizing radiated and conducted emi while facilitating optimum performance of the aat1151. ceramic x5r or x7r capacitors are ideal for this function. the size required will vary depending on the load, output voltage, and input voltage source impedance characteristics. a typical value is around 10 f. the input capacitor rms current varies with the input voltage and the output voltage. the equation for the rms current in the input capacitor is: ?? i rms = i o ? ? 1 - ?? v o v in v o v in the input capacitor rms ripple current reaches a maxi- mum when v in is two times the output voltage where it is approximately one half of the load current. losses associated with the input ceramic capacitor are typically minimal and are not an issue. proper placement of the input capacitor can be seen in the reference design lay- out in figures 2 and 4. output capacitor since there are no external compensation components, the output capacitor has a strong effect on loop stability. lager output capacitance will reduce the crossover fre- quency with greater phase margin. for the 1.5v 1a design using the 4.1 h inductor, two 22 f capacitors provide a stable output. in addition to assisting stability, the output capacitor limits the output ripple and provides holdup during large load transitions. the output capaci- tor rms ripple current is given by: 1 23 v out (v in - v out ) rms i l f s v in = for a ceramic capacitor, the esr is so low that dissipation due to the rms current of the capacitor is not a concern. tantalum capacitors with sufficiently low esr to meet output voltage ripple requirements also have an rms current rating well beyond that actually seen in this application. layout figures 2 through 5 display the suggested pcb layout for the aat1151. the following guidelines should be used to help ensure a proper layout. ? the input capacitor (c1) should connect as closely as possible to vp (pin 5) and pgnd (pin 8). ? c2 and l1 should be connected as closely as possible. the connection l1 to the lx node should be as short as possible. ? the feedback trace (pin 1) should be separate 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. ? the resistance of the trace from the load return to the pgnd (pin 8) should be kept to a minimum. this will help to minimize any error in dc regulation due to dif- ferences in the potential of the internal signal ground and the power ground. ? low pass filter r1 and c3 provide a cleaner bias source for the aat1151 active circuitry. c3 should be placed as closely as possible to sgnd (pin 2) and vcc (pin 4). see figures 2 and 7.
11 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 figure 2: msop evaluation figure 3: msop evaluation board top layer. board bottom layer. figure 4: qfn evaluation board top side. figure 5: qfn evaluation board bottom side. 0 5 10 15 20 25 30 35 40 45 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 output voltage (v) r3 (k r4=10k l1 3.3h c2, c4 2x 22f c1 10f r1 100 c3 0.1f c1 murata 10f 6.3v x5r grm42-6x5r106k6.3 l1 sumida cdrh3d16-3r3 nc r2 100k c2, c4 murata 22f 6.3v grm21br60j226me39l x5r 0805 v o + 1.25v 0.7a 2.7v - 5.5v gnd fb 4 sgnd 5,6 en 7 vcc 9 vp 10,11,12 lx 13,14,15 pgnd 1,2,3 aat1151-1.0 r3 2.55k 1% r4 10k 1% figure 6: r3 vs. v out for adjustable output figure 7: adjustable output schematic. using the aat1151-1.0v.
12 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 thermal calculations there are two types of losses associated with the aat1151 output switching mosfet: switching losses and conduction losses. conduction losses are associated with the r ds(on) characteristics of the output switching device. at the full load condition, assuming continuous conduc- tion mode (ccm), a simplified form of the total losses is given by: sw o sin in i o 2 (r ds(on)h v o + r ds(on)l (v in v o )) p = fi v v + i q ) v in + (t where i q is the aat1151 quiescent current. once the total losses have been determined, the junction temperature can be derived from the ? ja for the msop-8 package. t j = p ja + t amb adjustable output for applications requiring an output other than the fixed available, the 1v version can be programmed externally. resistors r3 and r4 of figure 7 force the output to regu- late higher than 1v. r4 should be 100 times less than the 1m ? internal resistance of the fb pin (recommended 10k ? ). once r4 is selected, r3 can be calculated. for a 1.25 volt output with r4 set to 10.0k ? , r3 is 2.55k ? . r3 = (v o - 1) r4 = 0.25 10k = 2.55k
13 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 design example specifications i out = 0.7a i ripple = 40% of full load at max v in v out = 1.5v v in = 2.7v to 4.2v (3.6v nominal) f s = 850khz t am = 85c maximum input capacitor ripple 1 0.35arms, v in = 2 v o oo rms o in in vv ii vv ?? = -= ?? p = esr i rms 2 = 5m 0.35 2 a = 0.6mw inductor selection v out v out 1.5 v 1.5v l = ? 1 - = ? 1 - = 4.05 h i o ? k ? f s v in 0.7a ? 0.4 ? 850khz 4.2v ? ? ? ? ? ? ? ? select sumida inductor cdrh3d16, 3.3 h, 63m ? , 1.8mm height. v o v o 1.5 v 1.5v i = ? 1 - = ? 1- = 340ma l ? f s v in 3.3 h ? 850khz 4.2v i pk = i out + i = 0.7a + 0.17a = 0.87a 2 p = i o 2 ? dcr = (0.7) 2 ? 63m = 31mw ? ? ? ? ? ? ? ? output capacitor ripple current 1 23 1 1.5v (4.2v - 1.5v) 3.3 h 850khz 4.2v 23 rms i l f s v in = = 99marms v out (v in - v out ) = pesr = esr i rms 2 = 5m 99 2 ma = 50 w
14 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 aat1151 dissipation 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 = = + (20nsec ? 850khz ? 0.7a + 0.3ma) ? 4.2v = 0.145 w (0.7a) 2 ? (0.2 ? 1.5v + 0.187 ? (4.2v - 1.5v)) 4.2v t j(max) = t amb + ja ? p loss = 85 c + 150 c/w ? 0.145w = 107 c (msop-8 ) = 85 c + 50 c/w ? 0.145w = 92 c (qfn33-16) manufacturer part number value max dc current dcr ( ) size (mm) l x w x h type taiyo yuden npo5db4r7m 4.7 h 1.4a 0.038 5.9 x 6.1 x 2.8 shielded toko a914byw-3r5m-d52lc 3.5 h 1.34a 0.073 5.0 x 5.0 x 2.0 shielded sumida cdrh5d28-3r0 3.0 h 2.4a 0.024 5.7 x 5.7 x 3.0 shielded sumida cdrh5d28-4r2 4.2 h 2.2a 0.031 5.7 x 5.7 x 3.0 shielded sumida cdrh5d18-4r1 4.1 h 1.95a 0.057 5.7 x 5.7 x 2.0 shielded murata lqh55dn4r7m03 4.7 h 2.7a 0.041 5.0 x 5.0 x 4.7 non-shielded murata LQH66SN4R7M03 4.7 h 2.2a 0.025 6.3 x 6.3 x 4.7 shielded murata cdrh3d16-3r3 3.3 h 1.1a 0.063 3.8 x 3.8 x 1.8 shielded table 1: surface mount inductors. manufacturer part number value voltage temp. co. case murata grm40 x5r 106k 6.3 10 f 6.3v x5r 0805 murata grm42-6 x5r 106k 6.3 10 f 6.3v x5r 1206 murata grm21br60j226me39l 22 f 6.3v x5r 0805 murata grm21br60j106me39l 10 f 6.3v x5r 0805 table 2: surface mount capacitors.
15 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? skyworks proprietary information ? products and product information are subject to change without notice. ? mar ch 18, 2013 1. contact local sales office for custom options. 2. xyy = assembly and date code. 3. sample stock is generally held on part numbers listed in bold . 4. the leadless package family, which includes qfn, tqfn, dfn, tdfn and stdfn, has exposed copper (unplated) at the end of the lead terminals due to the manufacturing process. a solder fillet at the exposed copper edge cannot be guaranteed and is not required to ensure a proper bottom solder c onnection. ordering information output voltage 1 package marking 2 part number (tape and reel) 3 1.0v (adj. v out 1.0v) qfn33-16 jhxyy aat1151ivn-1.0-t1 1.8v msop-8 jixyy aat1151iks-1.8-t1 2.5v qfn33-16 jjxyy aat1151ivn-2.5-t1 3.3v msop-8 nkxyy aat1151iks-3.3-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 4 msop-8 pin 1 1.95 bsc 0.254 bsc 0.155 all dimensions in millimeters.
16 aat115 1 850khz 700ma synchronous buck dc/dc converte r data sheet skyworks solutions, inc. ? phone [781] 376-3000 ? fax [781] 376-3100 ? sales@skyworksinc.com ? www.skyworksinc.com 201991b ? 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. qfn33-16 3.000 0.050 pin 1 dot by marking 1.250 0.050 0.400 0.100 1.250 0.050 3.000 0.050 0.500 0.050 0.900 0.100 pin 1 identification c0.3 0.025 0.025 0.214 0.036 0.230 0.050 top view bottom view side view 1 13 5 9 all dimensions in millimeters.

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