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rev. 1.6 december 2010 www.aosmd.com page 1 of 17 aoz1022 ezbuck? 3a synchrono us buck regulator general description the aoz1022 is a synchronous high efficiency, simple to use, 3a buck regulator. the aoz1022 works from a 4.5v to 16v input voltage range, and provides up to 3a of continuous output current with an output voltage adjustable down to 0.8v. the aoz1022 comes in a dfn 5x4 and an epad so-8 package and is rated over a -40c to +85c ambient temperature range. features 4.5v to 16v operating input voltage range synchronous rectification: 100m ? internal high-side switch and 20m ? internal low-side switch high efficiency: up to 95% internal soft start active high power good state output voltage adjustable to 0.8v 3a continuous output current fixed 500khz pwm operation cycle-by-cycle current limit pre-bias start-up short-circuit protection thermal shutdown small size dfn 5x4 and epad so-8 package applications point of load dc-dc conversion pcie graphics cards set top boxes dvd drives and hdd lcd panels cable modems telecom/networking/datacom equipment typical application figure 1. 3.3v/3a synchronous buck regulator lx pgood vin vin vout 5v dc fb pgnd en comp agnd c2, c3 22f ceramic r1 r3 r2 c c r c c1 22f ceramic l1 4.7h aoz1022
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 2 of 17 ordering information aos green products use reduced levels of halogens, and are also rohs compliant. please visit www.aosmd.com/web/qualit y/rohs_compliant.jsp for additional information. pin configuration pin description part number ambient temperature range package environmental aoz1022di -40c to +85c dfn 5x4 aoz1022 -40c to +85c epad s0-8 green pgnd vin agnd fb pgood lx en comp 5x4 dfn-8 (top view) 1 2 3 4 8 7 6 5 gnd lx 1 2 3 4 pgnd vin agnd fb exposed pad so-8 (top view) pad (lx) nc pgood en comp 8 7 6 5 pin number pin name pin function 5x4 dfn-8 exposed pad so-8 1 1 pgnd power ground. pgnd needs to be electrically connected to agnd. 22v in supply voltage input. when v in rises above the uvlo threshold and en is logic high, the device starts up. 3 3 agnd analog ground. agnd is th e reference point for contro ller section. agnd needs to be electrically connected to pgnd. 4 4 fb feedback input. the fb pin is used to set the output voltage via a resistor divider between the output and agnd. 5 5 comp external loop compensation pin. connect a rc network between comp and agnd to compensate the control loop. 6 6 en enable pin. pull en to logic high to enable the device. pull en to logic low to disable the device. if on/off control is not needed, connect it to v in and do not leave it open. 7 pad lx switching node. lx is the drain of the inte rnal pfet. lx is used as the thermal pad of the power stage. 8 7 pgood power good output. pgood is an open-drai n output that indicates the status of out- put voltage. pgood is pulled low when out put is below 90% of the normal regula- tion. 8 nc no connect. pin 8 is not internally connected.
rev. 1.6 december 2010 www.aosmd.com page 3 of 17 aoz1022 block diagram absolute maximum ratings exceeding the absolute maxi mum ratings may damage the device. note: 1. devices are inherently esd s ensitive, handling precautions are required. human body model rating: 1.5k ? in series with 100pf. recommended operating conditions the device is not guaranteed to operate beyond the maximum recommended operating conditions. 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 application depends on the user's specific board design. oscillator agnd pgnd vin en fb comp pgood lx otp internal +5v ilimit pwm control logic 5v ldo regulator uvlo & por softstart reference & bias 0.8v q1 q2 pwm comp level shifter + fet driver isen eamp 0.2v + ? + ? + ? + ? + 0.72v ? + frequency foldback 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 pgood to agnd -0.3v to 6v junction temperature (t j ) +150c storage temperature (t s ) -65c to +150c esd rating (1) 2.0kv parameter rating supply voltage (v in ) 4.5v to 18v output voltage range 0.8v to v in ambient temperature (t a ) -40c to +85c package therma l resistance exposed pad so-8 ( ja ) (2 ) 50c/w
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 4 of 17 electrical characteristics t a = 25c, v in = v en = 12v, v out = 3.3v unless otherwise specified. (3) note: 3. specifications 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 4.1 3.7 v i in supply current (quiescent) i out = 0, v fb = 1.2v, v en > 1.2v 1.6 2.5 ma i off shutdown supply current v en = 0v 320 a v fb feedback voltage t a = 25c 0.788 0.8 0.812 v load regulation 0.5 % line regulation 1% i fb feedback voltage input current 200 na enable v en en input threshold off threshold on threshold 2 0.6 v v hys en input hysteresis 100 mv modulator f o frequency 350 500 600 khz d max maximum duty cycle 100 % d min minimum duty cycle 6% g vea error amplifier voltage gain 500 v / v g ea error amplifier transconductance 200 a / v protection i lim current limit 4.0 5.0 a over-temperature shutdown limit t j rising t j falling 150 100 c t ss soft start interval 3 5 7 ms power good v olpg pgood low voltage i ol = 1ma 0.5 v pgood leakage 1a v pgl pgood threshold voltage 87 90 92 %v o pgood threshold voltage hysteresis 3 % t pg pgood delay time 128 s pwm output stage high-side switch on-resistance v in = 12v v in = 5v 97 166 130 200 m ? low-side switch on-resistance v in = 12v v in = 5v 18 30 23 36 m ?
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 5 of 17 light load operation full load (ccm) operation startup to full load short circuit protection 50% to 100% load transient short circuit recovery 1s/di v 1s/di v 1ms/di v 100s/di v v in ripple 0.1 v /di v v o ripple 20m v /di v v o 2 v /di v v in 10 v /di v lin 1a/di v v o ripple 100m v /di v lo 1a/di v il 1a/di v v lx 10 v /di v v in ripple 0.1 v /di v v o ripple 20m v /di v il 1a/di v v lx 10 v /di v 50s/di v lx 10 v /di v v o 2 v /di v il 2a/di v 1ms/di v lx 10 v /di v v o 2 v /di v il 2a/di v typical performance characteristics circuit of figure 1. t a = 25c, v in = v en = 12v, v out = 3.3v unless otherwise specified.
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 6 of 17 efficiency thermal derating curves aoz1022 efficiency efficiency (v in = 12v) vs. load current 75 80 70 65 85 90 95 5.0v output 3.3v output 1.8v output 1.2v output 1.8v 3.3v output 100 0 0.5 1.0 1.5 2.0 2.5 3.0 load current (a) efficieny ( % ) aoz1022 efficiency efficiency (v in = 5v) vs. load current 75 80 70 65 85 90 95 100 0 0.5 1.0 1.5 2.0 2.5 3.0 load current (a) efficieny ( % ) derating curve at 5v/6v input 1.2v, 1.8v output 3.3v output ambient temperature (t a ) output current (i o ) 5 4 3 2 1 0 25 35 45 55 65 75 85 derating curve at 12 input 1.2v, 1.8v, 3.3v, 5.0v output ambient temperature (t a ) output current (i o ) 3.3 3.2 3.1 3.0 2.9 2.8 25 35 45 55 65 75 85
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 7 of 17 detailed description the aoz1022 is a current-mode step down regulator with integrated high-side pm os switch and a low-side nmos switch. it operates from a 4.5v to 16v input voltage range and supplies up to 3a of load current. the duty cycle can be adjusted from 6% to 100% allowing a wide range of output voltage. features include enable control, power-on reset, input under voltage lockout, output over voltage protection, acti ve high power good state, fixed internal soft-start and thermal shut down. enable and soft start the aoz1022 has an 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 4.1v and voltage on en pin is high. in the soft start process, the output voltage is typically ramped to regulation voltage in 4ms. the 4ms soft start time is set internally. the en pin of the aoz1022 is active high. connect the en pin to v in if the enable function is not used. pulling en to ground will dis able the aoz1022. do not leave it open. the voltage on the en pin must be above 2v to enable the aoz1022. when voltage on the en pin falls below 0.6v, the aoz1022 is disabled. if an appli- cation circuit requires the aoz1022 to be disabled, an open drain or open collector circuit should be used to interface to the en pin. power good the output of power-good is an open drain n-channel mosfet which supplies an active high power good stage. a pull-up resistor (r 3 ) should connect this pin to a dc power trail with maximum voltage of 6v. the aoz1022 monitors the fb voltage. when fb voltage is lower than 90% of the normal voltage, n-channel mosfet turns on and the power-good pin is pulled low. this indicates the power is abnormal. steady-state operation under steady-state conditions, the converter operates in fixed frequency and continuous-conduction mode (ccm). the aoz1022 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 voltage, which shows on the comp pin, is compared against the current signal, which is sum of inductor current signal and ramp compensation signal, at the 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 freewheeling through the internal low-side n-mosfet switch to output. the internal adaptive fet driver guarantees no turn on overlap of both high-side and low-side switch. comparing with regulators using freewheeling schottky diodes, the aoz1022 uses freewheeling nmosfet to realize synchronous rectification. it greatly improves the converter efficiency and reduces power loss in the low-side switch. the aoz1022 uses a p-channel mosfet as the high- side switch. it saves the bootstrap capacitor normally seen in a circuit which is using an nmos switch. it allows 100% turn-on of the high-side switch to achieve linear regulation mode of operation. the minimum voltage drop from v in to v o is the load current x dc resistance of mosfet + dc resistance of buck inductor. it can be calculated by the 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 3a, and r ds(on) is the on resistance of in ternal mosfet, the value is between 97m ? and 200m ? depending on input voltage and junction temperature. switching frequency the aoz1022 switching frequency is fixed and set by an internal oscillator. the practical switching frequency could range from 350khz to 600khz due to device variation. output voltage programming output voltage can be set by feeding back the output to the fb pin by using a resistor divider network. see the application circuit shown in figure 1. the resistor divider network includes r 1 and r 2 . usually, a design is started by picking a fixed r 2 value and calculating the required r 1 with equation on the next page: v o_max v in i o r ds on () ? = v o 0.8 1 r 1 r 2 ------ - + ?? ?? ?? =
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 8 of 17 some standard value of r 1 , r 2 and most used output voltage values are listed in table 1. the combination of r 1 and r 2 should be large enough to avoid drawing excessive current from the output, which will cause power loss. since the switch duty cycle can be as high as 100%, the maximum output voltage can be set as high as the input voltage minus the voltage drop on upper pmos and inductor. protection features the aoz1022 has multiple prot ection features to prevent system circuit damage unde r abnormal conditions. over current protection (ocp) the sensed inductor current signal is also used for over current protection. since the aoz1022 employs peak current mode control, the comp pin voltage is proportional to the peak inductor current. the comp pin voltage is limited to be between 0.4v and 2.5v internally. the peak inductor current is automatically limited cycle by cycle. when the output is shorted to ground under fault conditions, the inductor curr ent decays very slow during a switching cycle because of v o = 0v. to prevent cata- strophic failure, a secondary current limit is designed inside the aoz1022. the measured inductor current is compared against a preset voltage which represents the current limit, between 3.5a and 5.0a. when the output current is more than current limit, the hi gh side switch will be turned off. the converter w ill initiate a soft start once the over-current condition is resolved. power-on reset (por) a power-on reset circuit monitors the input voltage. when the input voltage exceeds 4.1v, the converter starts operation. when input voltage falls below 3.7v, the converter shuts down. 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. the regulator will rest art automatically under the control of soft-start circuit when the junction temperature decreases to 100c. application information the basic aoz1022 application circuit is show in figure 1. component selection is explained below. input capacitor the input capacitor must be connected to the v in pin and pgnd pin of aoz1022 to maintain steady input voltage and filter out the pulsing input current. the voltage rating of input capacitor 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 selecting the capacitor. for a buck circuit, the rms value of input capacitor current can be calculated by: if we let m equal the conversion ratio: the relation between the input capacitor rms current and voltage conversion ratio is calculated and shown in figure 2 on the next page. it can be seen that when v o is half of v in , c in is under the worst current stress. the worst current stress on c in is 0.5 x i o . 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 current rating. depending on the application circuits, other low esr tantalum capacitor may also be used. when selecting cerami c capacitors, x5r or x7r type dielectric ceramic capacitors should be used for their better temperature and voltage characteristics. v o (v) r 1 (k ? ) r 2 (k ? ) 0.8 1.0 open 1.2 4.99 10 1.5 10 11.5 1.8 12.7 10.2 2.5 21.5 10 3.3 31.1 10 5.0 52.3 10 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 =
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 9 of 17 figure 2. i cin vs. voltage conversion ratio note that the ripple current rating from capacitor manu- factures are based on certain amount of life time. further de-rating may be necessary in practical design. 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 need 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 select ed based on the dc output voltage rating, output ripple voltage specification and ripple current rating. the selected output capacito r must have a higher rated voltage specification than the maximum desired output voltage including ripple. de-rating needs to be consid- ered for long term reliability. output ripple voltage specif ication is another important factor for selecting the outp ut capacitor. in a buck con- verter circuit, output ripple voltage is determined by inductor value, switching frequency, 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 resistance of the output capacitor. when low esr ceramic capacitor is used as output capacitor, the impedance of the capacitor at the switching 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 operat- ing 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 induc- 0 0.1 0.2 0.3 0.4 0.5 0 0.5 1 m i cin_rms (m) i o 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 ---------- =
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 10 of 17 tor ripple current is high, the output capacitor could be overstressed. loop compensation the aoz1022 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 the dominant pole can be calculated by: the zero is an 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 control loop transfer function to get the desired gain and phase. several different types of compensation network can be used for the aoz1022. in 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 aoz1022, fb pin and comp pin are the inverting input and the output of internal error amplifier. a series r and c compensation network connected to comp provides one pole and one zero. the pole is: where; g ea is the error amplifier transconductance, which is 200 x 10 -6 a/v, g vea is the error amplifier voltage; and c 2 is compensation ca pacitor in figure 1. the zero given by the external compensation network, capacitor c 2 and resistor r 3 , 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 is the also called the converter bandwidth. generally a higher bandwidth means faster response to load transient. however, the bandwidth should not be too high because of system stab ility concern. when design- ing the compensation loop, converter stability under all line and load condition must be considered. usually, it is recommended to set the bandwidth to be equal or less than 1/10 of switching frequency. the aoz1022 operates at a frequency range from 350khz to 600khz. it is recommended to choose a crossover frequency equal or less than 40khz. 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 crossover frequency, f c , to calculate r 3 : where; where f c is desired crossover frequency. for best performance, f c is set to be about 1/10 of switching frequency, v fb is 0.8v, g ea is the error amplifier transconductance, which is 200 x 10 -6 a/v, and g cs is the current sense circuit transconductance, which is 6.86 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 f p1 but lower than 1/5 of selected crossover frequency. c 2 can is selected by: the above equation can 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 40 khz = r c f c v o v fb ---------- 2 c 2 g ea g cs ----------------------------- - = c c 1.5 2 r c f p 1 ---------------------------------- - = c c c o r l r c --------------------- =
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 11 of 17 an easy-to-use application software which helps to design and simulate the compensation loop can be found at www.aosmd.com . thermal management and layout consideration in the aoz1022 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 anode of schottky diode, to the cathode of schottky diode. 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 strongly recommended to connect input capaci- tor, output capacitor, and pgnd pin of the aoz1022. in the aoz1022 buck regulator circuit, the major power dissipating components are the aoz1022 and the output inductor. the total power dissipation of converter circuit can be measured by input power minus output power. the power dissipation of inductor can be approximately calculated by output curr ent and dcr of inductor. the actual junction temperature can be calculated with power dissipation in the aoz1022 and thermal impedance from junction to ambient. the maximum junction tem perature of aoz1022 is 150c, which limits the maxi mum load current capability. please see the thermal de-rating curves for maximum load current of the aoz1022 under different ambient temperature. the thermal performance of the aoz1022 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 reco mmended environmental conditions. the aoz1022 comes in an epad so-8 package. layout tips are listed below for the best electric and thermal performance. figur e 3 illustrates a pcb layout example of the aoz1022. 1. the lx pins are connected to internal pfet and nfet drains. they are low resistance thermal conduction path and the mo st noisy switching node. connected a large copper plane to the lx pin to help thermal dissipation. 2. 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. 3. input capacitor should be connected to the v in pin and the pgnd pin as close as possible. 4. 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. 5. make the current trace from lx pins to l to co to the pgnd as short as possible. 6. pour copper plane on all unused board area and connect it to stable dc nodes, like v in , gnd or v out . 7. keep sensitive signal trace 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 ? () ja =
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 12 of 17 notes: 1. dimensions and tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. 3. the location of the terminal #1 identifier and terminal numbering convention conforms to jedec publication 95 sp-002. 4. dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip. if the terminal has the optional radius on the other end of the terminal, the dimension b should not be measured in that radius area. 5. coplanarity applies to the terminals and all other bottom surface metallization. 6. drawing shown are for illustration only. 7. the dimensions with * are just for reference 8. pin #3 and pin #7 are fused to dap. symbols a a3 b d d2 d3 e e2 e l l1 l2 l3 aaa bbb ccc ddd eee dimensions in millimeters recommended land pattern front view top view bottom view min. 0.70 0.40 4.90 2.05 1.66 3.90 2.23 0.50 ? nom. 0.75 0.20 ref. 0.45 5.00 2.15 1.76 4.00 2.33 0.95 bsc 0.55 0.40 0.285 ref. 0.835 ref. 0.15 0.10 0.10 0.08 0.05 max. 0.80 0.50 5.10 2.25 1.86 4.10 2.43 0.60 ? symbols a a3 b d d2 d3 e e2 e l l1 l2 l3 aaa bbb ccc ddd eee min. 0.028 0.016 0.190 0.080 0.064 0.154 0.088 0.020 ? nom. 0.30 0.008 ref. 0.018 0.200 0.085 0.070 0.157 0.092 0.037 bsc 0.022 0.016 0.011 ref. 0.033 ref. 0.006 0.004 0.004 0.003 0.002 max. 0.032 0.020 0.210 0.089 0.074 0.161 0.096 0.024 ? 4.51 0.285 2.33 1.65 0.285 1.86 0.40 2.25 0.50 typ. 0.95 typ. 0.65 4.20 dimensions in inches b a a3 seating plane d/2 e/2 d e l l2* l3* e2 l2* d3 l1 e d2 pin #1 ida chamfer 0.30 index area (d/2 x e/2) package dimensions, dfn 5x4
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 13 of 17 r0.40 p0 k0 a0 e e2 d0 e1 d1 b0 package dfn 5x4 (12 mm) a0 b0 k0 e e1 e2 d0 d1 p0 p1 p2 t 5.30 0.10 0.10 4.30 0.10 1.20 min. 1.50 1.50 12.00 0.10 1.75 0.10 5.50 0.10 8.00 0.20 4.00 0.10 2.00 0.05 0.30 unit: mm t 0.20 feeding direction leader/trailer and orientation 0.30 +0.10 / ?0 trailer tape 300mm min. components tape orientation in pocket leader tape 500mm min. tape dimensions, dfn 5x4
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 14 of 17 view: c c 0.05 3-1.8 ?960.2 6.450.05 3-?2.90.05 3-?1/8" 3-?1/4" 8.90.1 11.90 14 ref 1.8 5.0 12 ref 41.5 ref 43.00 44.50.1 2.00 6.50 10.0 10.71 10 3-?3/16" r48 ref ?86.00.1 2.20 6.2 ?13.00 ?21.20 ?17.0 r1.10 r3.10 2.00 3.3 4.0 6.10 0.80 3.00 8.00 +0.050.00 r0.5 1.80 2.5 38 44.50.1 46.00.1 8.00.1 40 6 3-?3/16" r3.95 6.50 ?90.00 6.0 1.8 1.8 r1 8.00 0.00 -0.05 n=?1002 a a a r121 r127 r159 r6 r55 p b w1 m ii i i 6.01 r1 zoom in iii zoom in ii zoom in a tape size 12mm reel size ?330 m ?330 +0.3 -4.0 w1 12.40 +2.0 -0.0 b 2.40 0.3 p 0.5 reel dimensions, dfn 5x4
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 15 of 17 package dimensions, epad so-8 notes: 1. package body sizes exclude mold flash and gate burrs. 2. dimension l is measured in gauge plane. 3. tolerance 0.10mm unless otherwise specified. 4. controlling dimension is millimeter, converted inch dimensions are not necessarily exact. 5. die pad exposure size is according to lead frame design. 6. followed from jedec ms-012 symbols a a1 a2 b c d d0 d1 e e e1 e2 e3 l y | l1?l1' | l1 dimensions in millimeters recommended land pattern min. 1.40 0.00 1.40 0.31 0.17 4.80 3.20 3.10 5.80 ? 3.80 2.21 0.40 ? 0 ? d0 unit: mm nom. 1.55 0.05 1.50 0.406 ? 4.96 3.40 3.30 6.00 1.27 3.90 2.41 0.40 ref 0.95 ? 3 0.04 1.04 ref max. 1.70 0.10 1.60 0.51 0.25 5.00 3.60 3.50 6.20 ? 4.00 2.61 1.27 0.10 8 0.12 dimensions in inches d1 e1 e e3 e2 note 5 l1' l1 l gauge plane 0.2500 c d 7 (4x) b 3.70 2.20 2.87 2.71 5.74 1.27 0.80 0.635 e a1 a2 a symbols a a1 a2 b c d d0 d1 e e e1 e2 e3 l y | l1?l1' | l1 min. 0.055 0.000 0.055 0.012 0.007 0.189 0.126 0.122 0.228 ? 0.150 0.087 0.016 ? 0 ? nom. 0.061 0.002 0.059 0.016 ? 0.195 0.134 0.130 0.236 0.050 0.153 0.095 0.016 ref 0.037 ? 3 0.002 0.041 ref max. 0.067 0.004 0.063 0.020 0.010 0.197 0.142 0.138 0.244 ? 0.157 0.103 0.050 0.004 8 0.005
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 16 of 17 tape and reel dimensions, epad so-8 carrier tape reel tape size 12mm reel size ? 33 0 m ? 33 0.00 0.50 packa g e s o- 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 w1 s k h n w v r trailer tape 3 00mm min. or 75 empty pockets components tape orientation in pocket leader tape 500mm min. or 125 empty pockets a0 p1 p2 feeding direction p0 e2 e1 e d0 t d1 w 1 3 .00 0. 3 0 w1 17.40 1.00 h ?1 3 .00 +0.50/-0.20 k 10.60 s 2.00 0.50 g ? r ? v ? leader/trailer and orientation unit: mm
aoz1022 rev. 1.6 december 2010 www.aosmd.com page 17 of 17 part marking z1022 fay part number code assembly lot code year & week code wlt fab & assembly location z1022di faywlt part number code assembly lot code fab & assembly location year & week code 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 provided 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. this data sheet contains preliminary data; supplementary data may be published at a later date. alpha & omega semiconductor reserves the right to make changes at any time without notice. life support policy alpha & omega semiconductor products are not author ized for use as critical components in life support devices or systems.

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