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rev. 1.1 april 2009 www.aosmd.com page 1 of 16 aoz1081 ezbuck? 1.8a high efficiency constant current regulator for leds general description the aoz1081 is a high efficiency, simple to use, 1.8a buck regulator for white led. the aoz1081 works from a 4.5v to 16v input voltage range, and provides up to 1.8a of continuous output current with an output voltage adjustable down to 0.25v. the aoz1081 comes in an so-8 package and is rated over a -40c to +85c ambient temperature range. features 4.5v to 16v operating input voltage range 100 m ? internal pfet switch for high efficiency: up to 95% internal schottky diode internal soft start 0.25v internal reference with 5% accuracy over temperature 1.8a continuous output current fixed 1mhz pwm operation cycle-by-cycle current limit short-circuit protection under voltage lockout output over voltage protection thermal shutdown small size so-8 package applications buck regulator for white leds landscape lighting flashlights battery powered backlight applications typical application figure 1. lx vin vout fb pgnd en comp agnd c1 22f c3 22f r fb hb led r 1 c 2 4.7h vin aoz1081
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 2 of 16 figure 2. ordering information all aos products are offered in packages with pb -free plating and compliant to rohs standards. please visit www.aosmd.com/web/qualit y/rohs_compliant.jsp for additional information. part number ambient temperature range package environmental AOZ1081AI -40c to +85c so-8 rohs lx vin vout fb pgnd en comp agnd c1 22f c3 22f r fb r 1 c 2 4.7h vin aoz1081 r2 r3 r4 r5 r6 r7 r8
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 3 of 16 pin configuration pin description lx lx en comp 1 2 3 4 pgnd vin agnd fb so-8 (top view) 8 7 6 5 pin number pin name pin function 1 pgnd power ground. electrically needs to be connected to agnd. 2 vin supply voltage input. when v in rises above the uvlo threshold the device starts up. 3 agnd reference connection for contro ller section. also used as thermal connection for controller section. electrically needs to be connected to pgnd. 4 fb led current feedback input. the fb voltage is regulated at 250mv in normal operation. the fb sense resistor sets t he nominal led current 5 comp external loop compensation pin. 6 en the enable pin is active high. connect en pin to v in if not used. do not leave the en pin floating. 7,8 lx pwm output connection to inductor. thermal connection for output stage.
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 4 of 16 block diagram absolute maximum ratings exceeding the absolute maximum ratings may damage the device. note: 1. devices are inherently esd sensitive, handling precautions are required. human body model rating: 1.5k ? in series with 100pf. recommend operating ratings the device is not guaranteed to operate beyond the maximum operating ratings. note: 2. the value of ja is measured with the device mounted on 1-in 2 fr-4 board with 2oz. copper, in a still air environment with t a = 25c. the value in any given applic ation depends on the user's spe- cific board design. 1000khz / 76khz oscillator frequency foldback comparator agnd pgnd vin en fb comp lx otp internal +5v ilimit pwm control logic 5v ldo regulator uvlo & por softstart reference & bias 0.25v 0.33v 0.15v q1 pwm comp level shifter + fet driver isen eamp + ? + ? + ? + ? + over voltage protection comparator + ? parameter rating supply voltage (v in ) 18v lx to agnd -0.7v to v in +0.3v en to agnd -0.3v to v in +0.3v fb to agnd -0.3v to 6v comp to agnd -0.3v to 6v pgnd to agnd -0.3v to +0.3v junction temperature (t j ) +150c storage temperature (t s ) -65c to +150c esd rating (1) 2kv parameter rating supply voltage (v in ) 4.5v to 16v output voltage range 0.25v to v in ambient temperature (t a ) -40c to +85c package thermal resistance so-8 ( ja ) (2) 87c/w
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 5 of 16 electrical characteristics t a = 25c, v in = v en = 12v, v out = 3.3v unless otherwise specified (3 ) note: 3. specification in bold indicate an ambient temperature range of -40c to +85c. these specifications are guaranteed by design. symbol parameter conditions min. typ. max. units v in supply voltage 4.5 16 v v uvlo input under-voltage lockout threshold v in rising v in falling 4.0 3.7 v i in supply current (quiescent) i out = 0, v comp = 0.1v, v en >1.2v 2 3 ma i off shutdown supply current v en = 0v 1 10 a v fb feedback voltage 0.2375 0.25 0.2625 v load regulation 0.5 % line regulation 0.5 % i fb feedback voltage input current 200 na v en en input threshold off threshold on threshold 2.0 0.6 v v hys en input hysteresis 100 mv modulator f o frequency 850 1000 1150 khz d max maximum duty cycle 100 % d min minimum duty cycle 12 % error amplifier voltage gain 500 v / v error amplifier transconductance 200 a / v protection i lim current limit 2.5 4.0 a v pr output over-voltage protection threshold off threshold on threshold 330 240 mv t j over-temperature shutdown limit 150 c t ss soft start interval 400 s output stage high-side switch on-resistance v in = 12v v in = 5v 97 166 130 200 m ?
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 6 of 16 typical performance characteristics circuit of figure 1. t a = 25c, v in = v en = 12v, v out = 3.3v unless otherwise specified. normalized switching frequency vs. v in 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 46 810121416 v in (v) 46810121416 v in (v) normalized switching frequency (%) normalized feedback voltage variation vs. v in 1.05 1.04 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 0.95 normalized fedback voltage (v) 0 0.2 0.4 0.6 v out = 7.2v v out = 3.6v 0.8 1.0 1.2 1.4 1.6 1.8 2.0 load current (a) efficiency (v in ) vs. load current 100 95 90 85 80 75 efficiency (%) digital dimming vs. led current 200hz pwm signal on en pin 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 102030405060708090100 pwm duty cycle (%) avg. led current (a)
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 7 of 16 typical performance characteristics (continued) typical switching waveform pwm dimming at 200hz (90% duty cycle) v out 2v/div v lx 5v/div i l 1a/div v en 5v/div v out 2v/div i out 0.5a/div pwm dimming at 200hz (90% duty cycle) v en 5v/div v out 2v/div i out 0.5a/div pwm dimming at 200hz (90% duty cycle) v en 5v/div v out 2v/div i out 0.5a/div start up v en 2.5v/div v out 2v/div i out 1a/div
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 8 of 16 detailed description the aoz1081 is a current-mode step down regulator with integrated high side pmos switch and a low side freewheeling schottky diode. it operates from a 4.5v to 16v input voltage range and supplies up to 1.8a of load current. the duty cycle can be adjusted from 12% to 100% allowing a wide range of output voltage. features include enable control, po wer-on reset, input under voltage lockout, fixed internal soft-start and thermal shut down. the aoz1081 is available in so-8 package. enable and soft start the aoz1081 has internal soft start feature to limit in-rush current and ensure the output voltage ramps up smoothly to regulation voltage. a soft start process begins when the input voltage rises to 4.5v and voltage on en pin is high. in soft st art process, the output volt- age is ramped to regulation voltage in typically 400s. the 400s soft start time is set internally. the en pin of the aoz1081 is active high. connect the en pin to v in if enable function is not used. pull it to ground will disable the aoz108 1. do not leave it open. the voltage on en pin must be above 2.0 v to enable the aoz1081. when voltage on en pin falls below 0.6v, the aoz1081 is disabled. if an ap plication circuit requires the aoz1081 to be disabled, an open drain or open collector circuit should be used to interface to en pin. pwm dimming the aoz1081 allows dimming up to 200hz pwm signal at the en pin. by forcing a pwm digital waveform to the en pin, the system will go into a digital dimming state. the output switch will be off when pwm waveform is logic low and it will be on when pwm waveform is logic high. the duty cycle range is 10% to 100%. steady-state operation under steady-state conditions, the converter operates in fixed frequency and continuous-conduction mode (ccm). the aoz1081 integrates an internal p-mosfet as the high-side switch. inductor current is sensed by amplifying the voltage drop across the drain to source of the high side power mosfet. output voltage is divided down by the external voltage divider at the fb pin. the difference of the fb pin voltage and reference is amplified by the internal transconductance error amplifier. the error volt- age, which shows on the comp pin, is compared against the current signal, which is sum of inductor current signal and ramp compensation signal, at pwm comparator input. if the current signal is less than the error voltage, the internal high-side switch is on. the inductor current flows from the input through the inductor to the output. when the current signal exceeds the error voltage, the high-side switch is off. the inductor current is freewheel- ing through the internal schottky diode to output. the aoz1081 uses a p-channel mosfet as the high side switch. it saves the bootstrap capacitor normally seen in a circuit which is usin g an nmos switch. it allows 100% turn-on of the upper switch to achieve linear regulation mode of operati on. the minimum voltage drop from v in to v o is the load current times dc resistance of mosfet + dc resistance of buck inductor. it can be calculated by equation below: where, v o_max is the maximum output voltage; v in is the input voltage from 4.5v to 16v; i o is the output current from 0a to 1.8a; r ds(on) is the on resistance of internal mosfet, the value is between 97m ? and 200m ? depending on input voltage and junction temperature; and r inductor is the inductor dc resistance; switching frequency the aoz1081 switching frequency is fixed and set by an internal oscillator. the act ual switching frequency could range from 850khz to 1.15mhz due to device variation. protection features the aoz1081 has multiple prot ection features to prevent system circuit damage under abnormal conditions. over current protection (ocp) the sensed inductor current signal is also used for over current protection. since the aoz1081 employs peak current mode control, the comp pin voltage is propor- tional to the peak inductor current. the comp pin volt- age is limited to be between 0.4v and 2.5v internally. the peak inductor current is automatically limited cycle by cycle. the cycle by cycle current lim it threshold is set between 2.5a and 4a. when the load current reaches the current limit threshold, the cycle by cycle current limit circuit turns v o_max v in i o r ds on () r inductor + () ? =
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 9 of 16 off the high side switch immediately to terminate the current duty cycle. the inductor current stop rising. the cycle by cycle current limit protection directly limits inductor peak current. the average inductor current is also limited due to the limitation on peak inductor current. when cycle by cycle current lim it circuit is triggered, the output voltage drops as the duty cycle decreasing. the aoz1081 has internal short circuit protection to protect itself from catastrophic failure under output short circuit conditions. the fb pin voltage is proportional to the output voltage. whenever fb pin voltage is below 0.15v, the short circuit protection circuit is triggered. as a result, the converter is shut down and hiccups at a frequency equals to 1/8 of normal switching frequency. the converter will start up via a soft start once the short circuit condition disappears. in short circuit protection mode, the inductor average current is greatly reduced because of the low hiccup frequency. output over voltage protection (ovp) the aoz1081 monitors the feedback voltage: when the feedback voltage is higher than 330mv, it immediate turns-off the pmos to protect the output voltage over- shoot at fault condition. when feedback voltage is lower than 240mv, the pmos is allow ed to turn on in the next cycle. power-on reset (por) a power-on reset circuit monito rs the input voltage. when the input voltage exceeds 4v, the converter starts opera- tion. when input voltage falls below 3.7v, the converter will stop switching. thermal protection an internal temperature sensor monitors the junction temperature. it shuts down the internal control circuit and high side pmos if the junction temperature exceeds 150c. application information the basic aoz1081 application circuit is shown in figure 1 and 2. component selection is explained below. setting the maximum led current the aoz1081 features a programmable led current using a resistor r fb at the end of the primary chain of leds. input capacitor the input capacitor (c1 in figure 1) must be connected to the v in pin and pgnd pin of the aoz1081 to maintain steady input voltage and filter out the pulsing input current. a small decoupling capacitor (cd in figure 1), usually 1f, should be connected to the v in pin and agnd pin for stable operation of the aoz1081. the voltage rating of input capa citor must be greater than maximum input voltage plus ripple voltage. the input ripple voltage can be approximated by equa- tion below: since the input current is discontinuous in a buck converter, the current stress on the input capacitor is another concern when select ing the capacitor. for a buck circuit, the rms value of input capacitor current can be calculated by: if let m equal the conversion ratio: the relationship between the input capacitor rms current and voltage conversion ratio is calculated and shown in figure 2. it can be seen that when v o is half of v in , c in is under the worst cu rrent stress. the worst current stress on c in is 0.5 x i o . figure 2. i cin vs. voltage conversion ratio i ledmax 250 mv r fb ------------------- = v in i o fc in ----------------- 1 v o v in -------- - ? ?? ?? ?? v o v in -------- - = i cin_rms i o v o v in -------- - 1 v o v in -------- - ? ?? ?? ?? = v o v in -------- - m = 0 0.1 0.2 0.3 0.4 0.5 0 0.5 1 m i cin_rms (m) i o
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 10 of 16 for reliable operation and best performance, the input capacitors must have current rating higher than i cin_rms at worst operating conditions. ceramic capacitors are preferred for input capacitors because of their low esr and high ripple current rating. depending on the application circuits, other low esr tantalum capacitor or aluminum electrolytic capacitor may also be used. when selecting ceramic capacitors, x5r or x7r type dielectric ceramic capacitors ar e preferred for their better temperature and voltage characteristics. note that the ripple current rating from capacitor manufactures is based on certain amount of life time. further de-rating may be necessary for practical design requirement. inductor the inductor is used to supply constant current to output when it is driven by a swit ching voltage. for given input and output voltage, inductance and switching frequency together decide the inductor ripple current, which is: the peak inductor current is: high inductance gives low inductor ripple current but requires larger size inductor to avoid saturation. low ripple current reduces inductor core losses. it also reduces rms current through inductor and switches, which results in less conduc tion loss. usually, peak to peak ripple current on inductor is designed to be 20% to 30% of output current. when selecting the inductor, make sure it is able to handle the peak current without saturation even at the highest operating temperature. the inductor takes the highest current in a buck circuit. the conduction loss on inductor needs to be checked for thermal and efficiency requirements. surface mount inductors in different shape and styles are available from coilcraft, elytone and murata. shielded inductors are small and radiate less emi noise. but they cost more than unshielded inductors. the choice depends on emi requirement, price and size. output capacitor the output capacitor is selected based on the dc output voltage rating, output ripple voltage specification and ripple current rating. the selected output capacit or must have a higher rated voltage specification than the maximum desired output voltage including ripple. de-rating needs to be considered for long term reliability. output ripple voltage specif ication is another important factor for selecting the output capacitor. in a buck converter circuit, output ripple voltage is determined by inductor value, switching fr equency, output capacitor value and esr. it can be calculated by the equation below: where; c o is output capacitor value, and esr co is the equivalent series resistor of output capacitor. when low esr ceramic capacitor is used as output capacitor, the impedance of the capacitor at the switch- ing frequency dominates. output ripple is mainly caused by capacitor value and inductor ripple current. the output ripple voltage calculation can be simplified to: if the impedance of esr at switching frequency dominates, the output ripple voltage is mainly decided by capacitor esr and inductor ripple current. the output ripple voltage calculation can be further simplified to: for lower output ripple voltage across the entire operating temperature range, x5r or x7r dielectric type of ceramic, or other low esr tantalum are recommended to be used as output capacitors. in a buck converter, output capacitor current is continuous. the rms current of output capacitor is decided by the peak to peak inductor ripple current. it can be calculated by: usually, the ripple current rating of the output capacitor is a smaller issue because of the low current stress. when the buck inductor is selected to be very small and inductor ripple current is high, output capacitor could be overstressed. i l v o fl ---------- - 1 v o v in -------- - ? ?? ?? ?? = i lpeak i o i l 2 -------- + = v o i l esr co 1 8 fc o ------------------------- + ?? ?? = v o i l 1 8 fc o ------------------------- = v o i l esr co = i co_rms i l 12 ---------- =
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 11 of 16 loop compensation the aoz1081 employs peak current mode control for easy use and fast transient response. peak current mode control eliminates the doubl e pole effect of the output l&c filter. it greatly simp lifies the compensation loop design. with peak current mode control, the buck power stage can be simplified to be a one-pole and one-zero system in frequency domain. the pole is dominant pole and can be calculated by: the zero is a esr zero due to output capacitor and its esr. it is can be calculated by: where; c o is the output filter capacitor, r l is load resistor value, and esr co is the equivalent series resistance of output capacitor. the compensation design is actually to shape the converter close loop transfer function to get desired gain and phase. several different types of compensation network can be used for ao z1081. for most cases, a series capacitor and resistor network connected to the comp pin sets the pole-zero and is adequate for a stable high-bandwidth control loop. in the aoz1081, fb pin and comp pin are the inverting input and the output of internal transconductance error amplifier. a series r and c compensation network con- nected to comp provides one pole and one zero. the pole is: where; g ea is the error amplifier transco nductance, which is 200 x 10 -6 a/v, g vea is the error amplifier voltage gain, which is 500 v/v, and c c is compensation capacitor. the zero given by the external compensation network, capacitor c c (c5 in figure 1) and resistor r c (r1 in figure 1), is located at: to design the compensation circuit, a target crossover frequency f c for close loop must be selected. the system crossover frequency is where control loop has unity gain. the crossover frequency is also called the converter bandwidth. generally a higher bandwidth means faster response to load transient. however, the bandwidth should not be too high due to system stability concern. when designing the compensation loop, converter stability under all line and load condition must be considered. usually, it is recommended to set the bandwidth to be less than 1/10 of switching frequency. the aoz1081 operates at a fixed switching frequency range from 750khz to 1.15mhz. it is recommended to choose a crossover frequency less than 75khz. the strategy for choosing r c and c c is to set the cross over frequency with r c and set the compensator zero with c c . using selected cr ossover frequency, f c , to calculate r c : where; f c is desired crossover frequency, v fb is 0.25v, g ea is the error amplifier tran sconductance, which is 200x10 -6 a/v, and g cs is the current sense circuit transconductance, which is 5.64 a/v. the compensation capacitor c c and resistor r c together make a zero. this zero is put somewhere close to the dominate pole fp1 but lower than 1/5 of selected crossover frequency. c c can is selected byy: the equation above can also be simplified to: f p 1 1 2 c o r l ---------------------------------- - = f z 1 1 2 c o esr co ------------------------------------------------ = f p 2 g ea 2 c c g vea ------------------------------------------ - = f z 2 1 2 c c r c ----------------------------------- = f c 75 khz = r c f c v o v fb ---------- 2 c o g ea g cs ----------------------------- - = c c 1.5 2 r c f p 1 ---------------------------------- - = c c c o r l r c --------------------- =
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 12 of 16 thermal management and layout consideration in the aoz1081 buck regulator circuit, high pulsing current flows through two circuit loops. the first loop starts from the input capacitors, to the v in pin, to the lx pins, to the filter inductor, to the output capacitor and load, and then return to the input capacitor through ground. current flows in the first loop when the high side switch is on. the second loop starts from inductor, to the output capacitors and load, to the pgnd pin of the aoz1081, to the lx pins of the azo1081. current flows in the second loop when the low side diode is on. in pcb layout, minimizing the two loops area reduces the noise of this circuit and improves efficiency. a ground plane is recommended to connect input capacitor, output capacitor, and pgnd pin of the aoz1081. in the aoz1081 buck regulator circuit, the two major power dissipating components are the aoz1081 and output inductor. the total power dissipation of converter circuit can be measured by input power minus output power. the power dissipation of indu ctor can be approximately calculated by output curr ent and dcr of inductor. the actual aoz1081 junction temperature can be calcu- lated with power dissipation in the aoz1081 and thermal impedance from junction to ambient. the maximum junction tem perature of aoz1081 is 150c, which limits the maximu m load current capability. please see the thermal de-rating curves for the maximum load current of the aoz1081 under different ambient temperature. the thermal performance of the aoz1081 is strongly affected by the pcb layout. extra care should be taken by users during design process to ensure that the ic will operate under the recommended environmental conditions. several layout tips are listed below for the best electric and thermal performance. fi gure 3 on the next page illustrates a single layer pc b layout exam ple as refer- ence. 1. do not use thermal relief connection to the v in and the pgnd pin. pour a maximized copper area to the pgnd pin and the v in pin to help thermal dissipation. 2. input capacitor should be connected to the v in pin and the pgnd pin as close as possible. 3. a ground plane is preferred. if a ground plane is not used, separate pgnd from agnd and connect them only at one point to avoid the pgnd pin noise coupling to the agnd pin. in this case, a decoupling capacitor should be connected between v in pin and agnd pin. 4. make the current trace from lx pins to l to co to the pgnd as short as possible. 5. pour copper plane on all unused board area and connect it to stable dc nodes, like v in , gnd or v out . 6. the two lx pins are connected to internal pfet drain. they are low resistance thermal conduction path and most noisy switching node. connected a copper plane to lx pin to help thermal dissipation. this copper plane should not be too larger otherwise switching noise may be coupled to other part of circuit. 7. keep sensitive signal trace such as trace connected with fb pin and comp pin far away form the lx pins. p total_loss v in i in v o i o ? = p inductor_loss i o 2 r inductor 1.1 = t junction p total_loss p inductor_loss ? () t ambient + =
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 13 of 16 figure 3. aoz1081 pcb layout vin gnd vo ut vf b gnd
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 14 of 16 package dimensions, so-8 notes: 1. all dimensions are in millimeters. 2. dimensions are inclusive of plating 3. package body sizes exclude mold flash and gate burrs. mold flash at the non-lead sides should be less than 6 mils. 4. dimension l is measured in gauge plane. 5. controlling dimension is millimeter, converted inch dimensions are not necessarily exact. symbols a a1 a2 b c d e1 e e h l dimensions in millimeters min. 1.35 0.10 1.25 0.31 0.17 4.80 3.80 5.80 0.25 0.40 0 d c l h x 45 7 (4x) b 2.20 5.74 0.80 unit: mm 1.27 a1 a2 a 0.1 gauge plane seating plane 0.25 e 8 1 e1 e nom. 1.65 ? 1.50 ? ? 4.90 3.90 1.27 bsc 6.00 ? ? ? max. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 6.20 0.50 1.27 8 symbols a a1 a2 b c d e1 e e h l dimensions in inches min. 0.053 0.004 0.049 0.012 0.007 0.189 0.150 0.228 0.010 0.016 0 nom. 0.065 ? 0.059 ? ? 0.193 0.154 0.050 bsc 0.236 ? ? ? max. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0.244 0.020 0.050 8
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 15 of 16 tape and reel dimensions, so-8 so- 8 carrier tape so- 8 reel so- 8 tape leader/trailer & orientation tape size 12mm reel size ?330 m ?330.00 0.50 packa g e so- 8 (12mm) a0 6.40 0.10 b0 5.20 0.10 k0 2.10 0.10 d0 1.60 0.10 d1 1.50 0.10 e 12.00 0.10 e1 1.75 0.10 e2 5.50 0.10 p0 8 .00 0.10 p1 4.00 0.10 p2 2.00 0.10 t 0.25 0.10 n ?97.00 0.10 k0 unit: mm b0 g m w 1 s k h n w v r trailer tape 300mm min. or 75 empty pockets components tape orientation in pocket leader tape 500mm min. or 125 empty pockets a0 p1 p2 see n ote 5 see n ote 3 see n ote 3 feeding direction p0 e2 e1 e d0 t d1 w 13.00 0.30 w1 17.40 1.00 h ?13.00 +0.50/-0.20 k 10.60 s 2.00 0.50 g ? r ? v ?
aoz1081 rev. 1.1 april 2009 www.aosmd.com page 16 of 16 package marking z1081ai fay part numbe r assembly lot code fab & assembly location year & week code wlt as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provid ed in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. life support policy alpha & omega semiconductor products ar e not authorized for use as critical components in life supp ort devices or systems.

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