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switchreg ? aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 1 general description the aat1155 switchreg? is a member of analogictech's total power management ic? (tpmic?) product family. the step-down switch- ing converter is ideal for applications where high efficiency, small size, and low ripple are critical. able to deliver 2.5a with an internal power mos- fet, the current-mode controlled ic provides high efficiency. fully internally compensated, the aat1155 simplifies system design and lowers external parts count. the aat1155 is available in a pb-free msop-8 package and is rated over the -40c to +85c tem- perature range. features ? 5.5v max supply input ? fixed or adjustable v out : 1.0v to 4.2v ? 2.5a output current ? up to 95% efficiency ? integrated low on resistance power switches ? internally compensated current mode control ? 1mhz switching frequency ? constant pwm mode ? low output ripple with light load ? internal soft start ? current limit protection ? over-temperature protection ? msop-8 package ? -40c to +85c temperature range applications ? cable/dsl modems ? computer peripherals ? high efficiency conversion from 5v or 3.3v supply ? network cards ? set-top boxes typical application output 1.5 h 120 f lx lx vp fb gnd aat1155 vcc enable 10 f 0.1 f 100 ? input
aat1155 1mhz 2.5a step-down dc/dc converter 2 1155.2005.11.1.6 pin descriptions pin configuration msop-8 1 2 lx vp lx vp fb gnd en vcc 1 2 3 4 8 7 6 5 pin # symbol function 1 fb feedback input pin. 2 gnd signal ground. 3 en converter enable pin. 4 vcc small signal filtered bias supply. 5, 8 vp input supply for converter power stage. 6, 7 lx inductor connection pin.
aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 3 absolute maximum ratings 1 t a = 25c, unless otherwise noted. thermal characteristics 3 recommended operating conditions symbol description rating units t ambient temperature range -40 to +85 c symbol description value units ja maximum thermal resistance 150 c/w p d maximum power dissipation 833 mw symbol description value units v cc , v p v cc , v p to gnd 6 v 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 v cc +0.3 v t j operating junction temperature range -40 to 150 c t lead maximum soldering temperature (at leads, 10 sec) 300 c v esd esd rating 2 - hbm 3000 v 1. stresses above those listed in absolute maximum ratings may cause permanent damage to the device. functional operation at c ondi- tions 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 (fr4, in still air).
electrical characteristics v in = v cc = v p = 5v, t a = -40c to +85c, unless otherwise noted. typical values are 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, -2.5 2.5 % i out = 0.5a v il input low voltage 0.6 v v ih input high voltage 1.4 v 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 q quiescent supply current no load, v fb = 0v 630 1000 a i shdn shutdown current v en = 0v, v in = 5.5v 1.0 a i lim current limit t a = 25c 4.4 a r ds(on)l high side switch on resistance t a = 25c 60 m ? efficiency i out = 1.0a 92 % ? v out (v out * ? v in ) load regulation i load = 0a to 2.5a 2.3 % ? v out /v out line regulation v in = 2.7v to 5.5v 0.75 %/v f osc oscillator frequency t a = 25c 1 mhz t sd over-temperature shutdown 140 c threshold t hys over-temperature shutdown 15 c hysteresis aat1155 1mhz 2.5a step-down dc/dc converter 4 1155.2005.11.1.6
typical characteristics output voltage variation vs. temperature (i out = 2a; v o = 3.3v) -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 -20 0 20 40 60 80 100 temperature ( c) variation (%) enable threshold vs. input voltage 0.6 0.7 0.8 0.9 1 1.1 1.2 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) enable threshold (v) en(h) en(l) oscillator frequency variation vs. temperature (v in = 5v) -4 -3 -2 -1 0 1 -20 0 2040608010 0 temperature ( c) variation (%) r ds(on) vs. input voltage (i ds = 1a) 40 45 50 55 60 65 70 75 80 2.5 3 3.5 4 4.5 5 5.5 input voltage (v) r ds(on) (m ? ? ) oscillator frequency variation vs. input voltage (v out = 3.3v) -0.5 -0.25 0 0.25 0.5 3.5 4 4.5 5 5.5 input voltage (v) variation (%) r ds(on) vs. temperature 40 50 60 70 80 90 -20 0 20 40 60 80 100 120 temperature ( c) r ds(on) (m ? ) 2.7v 3.6v 4.2v 5.0v 5.5v aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 5
typical characteristics inrush and output overshoot characteristics -8 -6 -4 -2 0 2 4 6 8 0 0.4 0.8 1.2 1.6 2 time (ms) enalbe and output voltage (v) (top trace) -2 0 2 4 6 8 10 12 14 inductor current (a) (bottom trace) over-temperature shutdown current vs. temperature (v out = 3.3v; v in = 5.0v) 2 2.5 3 3.5 4 4.5 5 -20 -10 0 10 20 30 40 50 60 70 80 90 100 temperature ( c) output current (a) non-switching operating current vs. temperature (fb = 0v) 450 500 550 600 650 700 750 -20 0 20 40 60 80 100 120 temperature ( c) operating current (ma) 2.7v 3.6v 4.2v 5.0v 5.5v load regulation (v in = 5.0v; v out = 3.3v) -10.0 -9.0 -8.0 -7.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 0.01 0.10 1.00 10.00 load current (a) output error (%) aat1155 evaluation board over-temperature current vs. input voltage (v out = 3.3v) 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.5 3.75 4 4.25 4.5 4.75 5 5.25 5.5 input voltage (v) output current (a) 100c 55c 70c 85c line regulation (v out = 3.3v) -5 -4 -3 -2 -1 0 1 3.4 3.7 4 4.3 4.6 4.9 5.2 5.5 in p ut volta g e ( v ) output voltage error (%) i o = 0.3a i o = 3.0a aat1155 1mhz 2.5a step-down dc/dc converter 6 1155.2005.11.1.6
typical characteristics tantalum transient response (i out = 0 to 3.0a; v out = 3.3v; v in = 5.0v) 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 0 100 200 300 400 500 time ( s) output voltage (top) (mv) -1 0 1 2 3 4 5 6 7 inductor current (bottom) (a) 120 f 6.3v tantalum vishay p/n 594d127x96r3c2t output ripple (i out = 3.0a; v out = 3.3v; v in = 5.0v) time ( s) ac output ripple (top) (mv) inductor current (bottom) (a) -12 -10 -8 -6 -4 -2 0 2 4 01 45 -1 0 1 2 3 4 5 6 7 300 f 6.3vceramic tdk p/n c3325x5r0j107m vishay grm43sr60j107me20l 23 loop crossover gain and phase -16 -12 -8 -4 0 4 8 12 16 10000 100000 1000000 fre q uenc y ( hz ) gain (db) -180 -135 -90 -45 0 45 90 135 180 phase (degrees) 120 f 6.3v tantalum vishay p/n 594d127x96r3c2t gain output ripple (i out = 3.0a; v out = 3.3v; v in = 5.0v) -12 -10 -8 -6 -4 -2 0 2 4 0 123 45 time ( s) ac output ripple (top) (mv) -1 0 1 2 3 4 5 6 7 inductor current (bottom) (a) 200 f 6.3v ceramic tdk p/n c3325x5r0j107m vishay grm43sr60j107me20l l oop c rossover g a i n an d ph ase -16 -12 -8 -4 0 4 8 12 16 10000 100000 frequency (hz) gain (db) -180 -135 -90 -45 0 45 90 135 180 phase (degrees) 100 f 6.3 ceramic tdk p/n c3225x5r0j107m vishay grm43sr60j107me20l phase 200 f gain 300 f gain l = 1.5 hy t anta l um o utput ri pp l e (i out = 3.0a; v out = 3.3v; v in = 5.0v) -0.12 -0.10 -0.08 -0.06 -0.04 -0.02 0.00 0.02 0.04 012345 time ( s) output ripple (top) (mv) -1 0 1 2 3 4 5 6 7 inductor current (bottom) (a) 120 f 6.3v tantalum vishay p/n 594d127x96r3c2t aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 7
aat1155 1mhz 2.5a step-down dc/dc converter 8 1155.2005.11.1.6 typical characteristics transient response (i out = 0 to 3.0a; v out = 3.3v; v in = 5.0v) 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 0 100 200 300 400 500 time ( s) -1 0 1 2 3 4 5 6 7 inductor current (bottom) (a) output voltage (top) (mv) 3x 100 f 6.3v ceramic tdk p/n c3325x5r0j107m vishay grm43sr60j107me20l transient response (i out = 0 to 3.0a; v out = 3.3v; v in = 5.0v) 2.60 2.70 2.80 2.90 3.00 3.10 3.20 3.30 3.40 0 100 200 300 400 500 time ( s) -1 0 1 2 3 4 5 6 7 inductor current (bottom) (a) 2x 100 f 6.3v ceramic tdk p/n c3325x5r0j107m vishay grm43sr60j107me20l output voltage (top) (mv)
aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 9 functional block diagram v p = 2.5v to 5.5v en logic ref temp. sensing osc op. amp vcc lx fb dh cmp applications information main control loop the aat1155 is a peak current mode step-down converter. the inner wide bandwidth loop controls the inductor peak current. the inductor current is sensed as it flows through the internal p-channel mosfet. a fixed slope compensation signal is then added to the sensed current to maintain sta- bility for duty cycles greater than 50%. the inner loop appears as a voltage-programmed current source in parallel with the output capacitor. the voltage error amplifier output programs the cur- rent loop for the necessary inductor current to force a constant output voltage for all load and line con- ditions. the feedback resistive divider is internal, dividing the output voltage to the error amplifier ref- erence voltage of 1.0v. the error amplifier has a limited dc gain. this eliminates the need for exter- nal compensation components, while still providing sufficient dc loop gain for good load regulation. the crossover frequency and phase margin are set by the output capacitor value. duty cycle extends to 100% as the input voltage approaches the output voltage. thermal shutdown protection disables the device in the event of a short-circuit or overload condition. soft start/enable soft start controls the current limit when the input voltage or enable is applied. it limits the current surge seen at the input and eliminates output volt- age overshoot. when pulled low, the enable input forces the device into a low-power, non-switching state. the total input current during shutdown is less than 1a. power and signal source separate small signal ground and power supply pins isolate the internal control circuitry from switching noise. in addition, the low pass filter r1 and c3 (shown in figure 1) filters noise associated with the power switching.
aat1155 1mhz 2.5a step-down dc/dc converter 10 1155.2005.11.1.6 current limit and over-temperature protection over-temperature and current limit circuitry pro- tects the aat1155 and the external schottky diode during overload, short-circuit, and excessive ambi- ent temperature conditions. the junction over-tem- perature threshold is 140c nominal and has 15c of hysteresis. typical graphs of the over-tempera- ture load current vs. input voltage and ambient temperature are shown in the typical character- istics section of this document. inductor the output inductor is selected to limit the ripple cur- rent to 20% to 40% of the full load current at the max- imum input voltage. manufacturer's specifications list both the inductor dc current rating, which is a ther- mal limitation, and the peak current rating, which is determined by the inductor saturation characteristics. the inductor should not show any appreciable satu- ration under normal load conditions. during overload and short-circuit conditions, the inductor can exceed its peak current rating without affecting the converter performance. some inductors may have sufficient peak and average current ratings yet result in exces- sive losses due to a high dcr. the losses associat- ed with the dcr and its effect on the total converter efficiency must be considered. for a 2.5a load and the ripple current set to 40% at the maximum input voltage, the maximum peak-to- peak ripple current is 1a. assuming a 5v 5% input voltage and 40% ripple, the output inductance required is: the factor "k" is the fraction of the full load (40%) selected for the ripple current at the maximum input voltage. the corresponding inductor rms current is: ? i is the peak-to-peak ripple current which is fixed by the inductor selection above. for a peak-to- peak current of 40% of the full load current, the peak current at full load will be 120% of the full load. the 1.5h inductor selected from the sumida cdrh6d38 series has a 11m ? dcr and a 4.0a dc current rating with a height of 4mm. at full load, the inductor dc loss is 70mw for a 0.84% loss in efficiency. 2 2 2.5a 12 rms o o i ii i ?? ? =+ = ?? l = 1 - v out v out i out k f sw v in(max) = 1 - 3.3v 3.3v 2.5a 0.4 1mhz 5.25v ?? ?? ?? ? ? ?? ? ? = 1.23 h figure 1: aat1155 evaluation board with adjustable output. d1 b340la l1 1.5h c2 120f c1 10f vp vcc en gnd fb lx lx vp u1 aat1155-1.0 r1 100 c3 0.1f c3 0. 1f 0603zd104m avx l1 cdrh6d28-1.5h sumida d1 b340la diodes inc. r2 100k c1 murata 10f 6.3v x5r grm42-6x5r106k6.3 c2 murata 100uf 6.3v grm43-2 x5r 107m 100f 6.3v (two or three in parallel ) vin 2.7v-5.5v v out 1.25v @ 2.5a rtn c4 100f c4 vishay sprague 100f 16v 595d107x0016c 100f 16v r3 2.55k r4 10.0k c2 vishay 120f 6.3v 594d127x96r6r3c2t options c2 tdk 100f 6.3v c3325x5r0j107m 100f 6.3v (two or three in parallel)
schottky freewheeling diode the schottky average current is the load current multiplied by one minus the duty cycle. for v in at 5v and v out at 3.3v, the average diode current is: with a 125c maximum junction temperature and a 120c/w thermal resistance, the maximum aver- age current is: for overload, short-circuit, and excessive ambient temperature conditions, the aat1155 enters over- temperature shutdown mode protecting the aat1155 as well as the output schottky. in this mode, the output current is limited internally until the junction temperature reaches the temperature limit (see over-temperature characteristics graphs). the diode reverse voltage must be rated to with- stand the input voltage. 3a surface mount schottky diodes input capacitor selection the primary function of the input capacitor is to pro- vide a low impedance loop for the edges of pulsed current drawn by the aat1155. a low esr/esl ceramic capacitor is ideal for this function. to mini- mize stray inductance, the capacitor should be placed as closely as possible to the ic. this also keeps the high frequency content of the input cur- rent localized, minimizing the radiated and con- ducted emi while facilitating optimum performance of the aat1155. proper placement of the input capacitor c1 is shown in the layout in figure 2. ceramic x5r or x7r capacitors are ideal. the size required will vary depending on the load, out- put voltage, and input voltage source impedance characteristics. typical values range from 1f to 10f. the input capacitor rms current varies with the input voltage and the output voltage. it is high- est when the input voltage is double the output volt- age where it is one half of the load current. 1 o o o rms in in vv ii vv ?? = - ?? diodes inc. b340la 0.45v @ 3a rohm rb050l-40 0.45 @ 3a micro semi 5820sm 0.46v @ 3a j(max) amb 125 70 = 1.14 a 120 / 0.4 avg tt cc i wv - - == c j-a v fwd 3.3 1 2.5 1 0.85a 5.0v o in v v i avg = i o a v ?? ?? -= - ?? ?? = 1 o in v v ?? - ?? aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 11 figure 2: 3.3v, 3a output efficiency. d1 b340la l1 1.5h c2 120f c1 10f vp vcc en gnd fb lx lx vp u1 aat1155-3.3 r1 100 c3 0.1f c3 0. 1f 0603zd104m avx l1 cdrh6d28-1.5h sumida d1 b340la diodes inc. r2 100k c1 murata 10f 6.3v x5r grm42-6x5r106k6.3 c2 murata 100f 6. 3v grm43-2 x5r 107m 100f 6. 3v (two or three in parallel) vin 3.5v-5.5v vout 3.3v @ 2.5a rtn c4 100f c4 vishay sprague 100f 16v 595d107x0016c 100f 16v c2 vishay 120f 6.3v 594d127x96r6r3c2t options c2 tdk 100f 6.3v c3325x5r0j107m 100f 6.3v (two or three in parallel) + -
aat1155 1mhz 2.5a step-down dc/dc converter 12 1155.2005.11.1.6 a high esr tantalum capacitor with a value about 10 times the input ceramic capacitor may also be required when using a 10f or smaller ceramic input bypass capacitor. this dampens any input oscilla- tions that may occur due to the source inductance resonating with the converter input impedance. output capacitor with no external compensation components, the out- put capacitor has a strong effect on the loop stability. larger output capacitance will reduce the crossover frequency with greater phase margin. a 200f ceramic capacitor provides sufficient bulk capacitance to stabilize the output during large load transitions and has esr and esl characteristics necessary for very low output ripple. the rms ripple current is given by: for a ceramic output capacitor, the dissipation due to the rms current and associated output ripple are negligible. tantalum capacitors with sufficiently low esr to meet output ripple requirements generally have an rms current rating much greater than that actually seen in this application. the maximum tantalum output capacitor esr is: where ? i is the peak-to-peak inductor ripple current. due to the esr zero associated with the tantalum capacitor, smaller values than those required with ceramic capacitors provide more phase margin with a greater loop crossover frequency. layout figures 3 and 4 display the suggested pcb layout for the aat1155. the following guidelines should be used to help ensure a proper layout. 1. the connection from the input capacitor to the schottky anode should be as short as possible. 2. the input capacitor should connect as closely as possible to v p (pins 5 and 8) and gnd (pin 2). 3. c1, l1, and cr1 should be connected as closely as possible. the connection from the cathode of the schottky to the lx node should be as short as possible. 4. 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 can degrade dc load regulation. 5. the resistance of the trace from the load return to the ground (pin 2) 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 reference ground and the load return. 6. r1 and c3 are required in order to provide a cleaner power source for the aat1155 con- trol circuitry. ripple v esr ? i () () 1 23 out fwd in out rms in vv vv i lfv + - = figure 3: evaluation board top side. figure 4: evaluation board bottom side.
aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 13 thermal losses associated with the aat1155 output switch- ing mosfet are due to switching losses and con- duction losses. the conduction losses are associ- ated with the r ds(on) characteristics of the output switching device. at the full load condition, assum- ing continuous conduction mode (ccm), an accu- rate calculation of the r ds(on) losses can be derived from the following equations: r ds(on) losses internal switch rms current d is the duty cycle and v f is the forward voltage drop of the schottky diode. ? i is the peak-to-peak inductor ripple current. a simplified form of calculating the r ds(on) and switching losses is given by: where i q is the aat1155 quiescent current. once the total losses have been determined, the junction temperature can be derived. the thermal resistance ( ja ) for the msop-8 package mounted on an fr4 printed circuit board in still air is 150c/w. t j = p q ja + t amb t amb is the maximum ambient temperature and t j is the resultant maximum junction temperature. design example (see figures 2 and 5 for reference) i out 2.5a i ripple 40% of full load at max v in v out 2.5v v in 5v 5% f s 1mhz t max 70c inductor selection use standard value of 1.5h sumida inductor series cdrh6d38. figure 5: 5v input, 3.3v output. efficiency vs. load current (v in = 5.0v; v out = 3.3v) 60 65 70 75 80 85 90 95 100 0.01 0.1 1 10 output current (a) efficiency (%) 1 3.3v 3.3v 1- 1.5 1 5.25v oo in vv i lf v hmhz ?? ? = -= ?? ?? = 0.82 a ?? 2 2.5a + 0.41 = 2.91a pk out i ii ? =+= 1 3.3v 3.3v 1 1.23 h 2.5a 0.4 1mhz out out oin vv l ikf v 5.25v ?? = - ?? ?? =-= ?? 2 o ds(on) o sw o q in in ir v ptfiiv v =+ + of in f vv d vv + = + 2 2 12 rms o i ii d ?? ? =+ ?? 2 on rms ds(on ) pi r =
aat1155 1mhz 2.5a step-down dc/dc converter 14 1155.2005.11.1.6 aat1155 junction temperature diode given an ambient thermal resistance of 120c/w from the manufacturer's data sheet, t j(max) of the diode is: output capacitor the output capacitor value required for sufficient loop phase margin depends on the type of capaci- tor selected. for a low esr ceramic capacitor, a minimum value of 200f is required. for a low esr tantalum capacitor, lower values are accept- able. while the relatively higher esr associated with the tantalum capacitor will give more phase margin and a more dampened transient response, the output voltage ripple will be higher. the 120f vishay 594d tantalum capacitor has an esr of 85m ? and a ripple current rating of 1.48arms in a c case size. although smaller case sizes are suf- ficiently rated for this ripple current, their esr level would result in excessive output ripple. the esr requirement for a tantalum capacitor can be estimated by : two or three 1812 x5r 100f 6.3v ceramic capacitors in parallel also provide sufficient phase margin. the low esr and esl associated with ceramic capacitors also reduces output ripple sig- nificantly over that seen with tantalum capacitors. temperature rise due to esr ripple current dissi- pation is also reduced. input capacitor the input capacitor ripple is: in the examples shown, c1 is a ceramic capacitor located as closely to the ic as possible. c1 pro- vides the low impedance path for the sharp edges associated with the input current. c4 may or may not be required, depending upon the impedance characteristics looking back into the source. it serves to dampen any input oscillations that may arise from a source that is highly inductive. for most applications, where the source has sufficient bulk capacitance and is fed directly to the aat1155 through large pcb traces or planes, it is not required. when operating the aat1155 evaluation board on the bench, c4 is required due to the inductance of the wires running from the laborato- ry power supply to the evaluation board. 1 1.82arms oo rms o in in vv ii vv ?? = -= ?? 100 111 0.9a ripple v mv esr m ? i = = ? () () 1 23 1 3.65 1.7 240 1.5 1 5 23 out fwd in out rms in vv vv i lfv vv marms hmhzv + - = = = j(max) 70 120 / 0.33w 109 amb ja tt p ccw c =+ = + = 0.35 0.93 0.33a va = p diode = v fw i diode = 1 3.3 2.5a 1 5.25v o diode o in v i i v v ?? = - = ?? ?? - = 0.93a ?? 0.35 fw vv = 2 690 0.42 on in in pv v a 5v 2 watts ?? =+ + i q = ?? ? ? ++ ? ? 70 c + 150 c/w 0.42w = 133 c i o 2 r ds(on) v o 2.5 2 70m ? 3.3v t sw f i o 20ns 1mhz 2.5a t j(max) = t amb + ja p =
aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 15 capacitors inductors diodes manufacturer part number v f diodes inc. b340la 0.45v @ 3a rohm rb050l-40 0.45 @ 3a micro semi 5820sm 0.46v @ 3a inductance i dcr height part number manufacturer (h) (amps) ( ? ? ) (mm) type cdrh6d38-4763-t055 sumida 1.5 4.0 0.014 4.0 shielded n05d b1r5m taiyo yuden 1.5 3.2 0.025 2.8 non-shielded np06db b1r5m taiyo yuden 1.5 3.0 0.022 3.2 shielded lqh55dn1r5m03 murata 1.5 3.7 0.022 4.7 non-shielded lqh66sn1r5m03 murata 1.5 3.8 0.016 4.7 shielded capacitance voltage part number manufacturer (f) (v) temp co. case c4532x5roj107m tdk 100 6.3 x5r 1812 grm43-2 x5r 107m 6.3 murata 100 6.3 x5r 1812 grm43-2 x5r 476k 6.3 murata 47 6.3 x5r 1812 grm42-6 x5r 106k 6.3 murata 10 6.3 x5r 1206 594d127x_6r3c2t vishay 120 6.3 c 595d107x0016c vishay 100 16 c adjustable output for applications requiring an output other than the fixed outputs available, the 1v version can be pro- grammed externally. resistors r3 and r4 of figure 1 force the output to regulate higher than 1 volt. for accurate results (less than 1% error for all outputs), select r4 to be 10k ? . once r4 has been selected, r3 can be calculated. for a 1.25 volt output with r4 set to 10k ? , r3 is 2.5k ? . r3 = (v o - 1) r4 = 0.25 10k ? = 2.5k ?
aat1155 1mhz 2.5a step-down dc/dc converter 16 1155.2005.11.1.6 ordering information package information msop-8 all dimensions in millimeters. pin 1 1.95 bsc 0.254 bsc 0.155 0.075 0.60 0.20 3.00 0.10 0.95 0.15 0.95 ref 0.85 0.10 3.00 0.10 10 5 4 4 0.65 bsc 0.30 0.08 0.075 0.075 4.90 0.10 gauge plane all analogictech products are offered in pb-free packaging. the term ?pb-free? means semiconductor products that are in compliance with current rohs standards, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. for more information, please visit our website at http://www.analogictech.com/pbfree. output voltage package marking 1 part number (tape and reel) 2 1.0v (adj. v out 1.0v) msop-8 kxxyy aat1155iks-1.0-t1 1.8v msop-8 kyxyy aat1155iks-1.8-t1 2.5v msop-8 ilxyy aat1155iks-2.5-t1 3.3v msop-8 ikxyy aat1155iks-3.3-t1 1. xyy = assembly and date code. 2. sample stock is generally held on part numbers listed in bold .
aat1155 1mhz 2.5a step-down dc/dc converter 1155.2005.11.1.6 17 advanced analogic technologies, inc. 830 e. arques avenue, sunnyvale, ca 94085 phone (408) 737-4600 fax (408) 737-4611 ? advanced analogic technologies, inc. analogictech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an analogictech pr oduct. no circuit patent licenses, copyrights, mask work rights, or other intellectual property rights are implied. analogictech reserves the right to make changes to their products or specifi cations or to discontinue any product or service without notice. customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information b eing relied on is current and complete. all products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warran ty, patent infringement, and limitation of liability. analogictech warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with anal ogictech?s standard warranty. testing and other quality con- trol techniques are utilized to the extent analogictech deems necessary to support this warranty. specific testing of all param eters of each device is not necessarily performed.

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