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AL8805 document number: ds35030 rev. 4 - 2 1 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 high efficiency 36v 1a buck led driver description the AL8805 is a step-down dc/dc converter designed to drive leds with a constant current. the device can drive up to 8 leds, depending on the forward voltage of the leds, in series from a voltage source of 6v to 36v. series connection of the leds provides identical led currents resulting in uniform brightness and eliminating the need for ballast resistors. the AL8805 switches at frequency up to 1mhz. this allows the use of small size external components, hence minimizing the pcb area needed. maximum output current of AL8805 is set via an external resistor connected between the v in and set input pins. dimming is achieved by applying either a dc voltage or a pwm signal at the ctrl input pin. an input voltage of 0.4v or lower at ctrl switches off the output mosfet simplifying pwm dimming. features ? led driving current up to 1a ? better than 5% accuracy ? high efficiency up to 98% ? operating input voltage from 6v to 36v ? high switching frequency up to 1mhz ? pwm/dc input for dimming control ? built-in output open-circuit protection ? sot25: available in ?green? molding compound (no br,sb) with lead free finish/ rohs compliant ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments 4set 5v in sw 1 ctrl 3 gnd 2 (top view) sot25 applications ? mr16 lamps ? general illumination lamps notes: 1. no purposely added lead. fully eu directiv e 2002/95/ec (rohs) & 2011/6 5/eu (rohs 2) compliant. 2. see http://www.diodes.com for more in formation about diodes incorpor ated?s definitions of halogen- and antimony-free, "gree n" and lead-free. 3. halogen- and antimony-free "green? products are defined as those which contain <900ppm br omine, <900ppm chlorine (<1500ppm t otal br + cl) and <1000ppm antimony compounds. typical applications circuit
AL8805 document number: ds35030 rev. 4 - 2 2 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 pin descriptions pin number pin name function 1 sw switch pin. connect inductor/freewheeling diode here, minimizing track length at this pin to reduce emi. 2 gnd gnd pin 3 ctrl dimming and on/off control input. ? leave floating for normal operation. (v ctrl = v ref = 2.5v giving nominal average output current i outnom = 0.1/r s ) ? drive to voltage below 0.4v to turn off output current ? drive with dc voltage (0.5v < v ctrl < 2.5v) to adjust output current from 20% to 100% of i outnom ? a pwm signal (low level 0.4v and high level > 2.6; transition times less than 1us) allows the output current to be adjusted below the level set by the resistor connected to set input pin. 4 set set nominal output current pin. configure the output current of the device. 5 v in input supply pin. must be locally decoupled to gnd with > 2.2f x7r ceramic capacitor ? see applications section for more information. absolute maximum ratings (@t a = +25c, unless otherwise specified.) symbol parameter ratings unit esd hbm human body model esd protection 2.5 kv esd mm machine model esd protection 200 v v in continuous v in pin voltage relative to gnd -0.3 to 40 v v set set pin voltage relative to v in pin -5 to +0.3 v v sw sw voltage relative to gnd -0.3 to 40 v v ctrl ctrl pin input voltage -0.3 to 6 v i sw-dc dc or rms switch current 1.25 a i sw-pk peak switch current (<10%) 2.5 a t j junction temperature 150 c t lead lead temperature soldering 300 c t st storage temperature range -65 to +150 c caution: stresses greater than the 'absolute maximum ratings' sp ecified above, may cause permanent damage to the device. these are stress ratings only; functional operation of the device at these or any other conditions exceeding those i ndicated in this specification is not impl ied. device reliability may be affected by exposure to absolute maximum rating conditions for extended periods of time. semiconductor devices are esd sensitive and may be damaged by ex posure to esd events. suitable esd precautions should be taken when handling and transporting these devices recommended operating conditions (@t a = +25c, unless otherwise specified.) symbol parameter min max unit v in operating input voltage relative to gnd 6.0 36 v v ctrlh voltage high for pwm dimming relative to gnd 2.6 5.5 v v ctrldc voltage range for 20% to 100% dc dimming relative to gnd 0.5 2.5 v v ctrll voltage low for pwm dimming relative to gnd 0 0.4 v i sw continuous switch current ? 1 a t j junction temperature range -40 125 c
AL8805 document number: ds35030 rev. 4 - 2 3 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 electrical characteristics (v in = 12, @t a = +25c, unless otherwise specified.) symbol parameter conditions min typ max unit v insu internal regulator start up threshold v in rising 5.9 v v insh internal regulator hysteresis threshold v in falling 100 300 mv i q quiescent current output not switching (note 4) 350 a i s input supply current ctrl pin floating f = 250khz 1.8 5 ma v th set current threshold voltage 95 100 105 mv v th-h set threshold hysteresis 20 mv i set set pin input current v set = v in -0.1 16 22 a r ctrl ctrl pin input resistance referred to internal reference 50 k ? v ref internal reference voltage 2.5 v r ds(on) on resistance of sw mosfet i sw = 1a 0.25 0.4 ? i sw_leakage switch leakage current v in = 30v 0.5 a f osc switching frequency 1 mhz ja thermal resistance junction-to- ambient (note 5) sot25 (note 6) 250 c/w jb thermal resistance junction-to-lead (note 7) sot25 50 notes: 4. AL8805 does not have a low power standby mode but current consumption is reduced when outp ut switch is inhibited: v sense = 0v. parameter is tested with v ctrl 2.5v 5. refer to figure 34 for the device derating curve. 6. test condition for sot25: device mounted on fr-4 pcb (25 mm x 25mm 1oz copper, minimum recommended pad layout on top layer a nd thermal vias to bottom layer ground plane. for better thermal performance, larger copper pad for heat-sink is needed. 7 . as sot25 doesn?t have an exposed tab or exposed pad the ma jority of heat flow is though pin 2 down to ground.
AL8805 document number: ds35030 rev. 4 - 2 4 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 typical performance characteristics (@t a = +25c, unless otherwise specified.) 0 50 100 150 200 250 300 350 400 v (v) figure 1 supply current (not switching) vs. input voltage in i (a) in v = 0v v = v t = 25c crtl set in a 06 12 18 24 30 36 0 100 200 300 400 500 600 700 800 900 012345 v(v) figure 2 switching frequency vs. v ctrl ctrl f r e q u e n c y (khz) v = 12v 1 led r = 150m t = 25c in set a l = 33h l = 68h l = 100h 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 012345 v (v) figure 3 led current vs. v ctrl ctrl i (a) led v = 12v 1 led t = 25c in a l = 68h r = 100m set r = 150m set r = 300m set -60 -40 -20 0 20 40 60 80 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 v (v) figure 4 i vs. v ctrl ctrl ctrl i ( a ) ctrl v = v = 12v t = 25c set in a 3 2.5 2 1.5 0.5 0 v (v) ctrl 1 v = open v = v ctrl set in t = 25c a 0 3 6 9 12 18 21 24 27 30 36 v (v) figure 5. v vs. input voltage (ctrl pin open circuit) in ctrl 15 33 2.48 2.49 2.50 2.51 2.52 -40 -15 10 35 60 85 110 ambient temperature (c) figure 6 v vs. temperature ctrl v (v) ctrl v = open v = v = 12v ctrl set in
AL8805 document number: ds35030 rev. 4 - 2 5 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0% 20% 40% 60% 80% 100% 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 led current (a) pwm duty cycle figure 7 i vs. pwm duty cycle led led c u r r en t e r r o r (%) 0 60 120 180 240 300 6 12 18 24 30 36 v (v) figure 8 sw r vs. input voltage in ds(on) r (m ) ds(on) v = open v = v t = 25c ctrl set in a 100 150 200 250 300 350 400 -40 -15 10 35 60 85 110 ambient temperature (c) figure 9 sw r vs. temperature ds(on) r(m) ds(on) 80 85 90 95 100 105 110 115 120 125 130 -2 0 2 4 6 8 10 12 14 16 18 time (s) figure 10 sw output switching characteristics v sw v(mv) sense r = 150m l = 68h v = 12v 1 led load set in v sw v sense i led v sw v ctrl 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 050100150200 time (s) figure 11 pwm dimming 0 2 4 6 8 10 12 14 16 18 20 duty cycle = 5% switch and ctrl voltage (v) led current (a) r = 150m , l =68h, v = 12v, 1led load, t =25 c set in a ? 6 9 12151821242730 input voltage (v) figure 12 duty cycle vs. input voltage d u t y c y c le l = 33h r = 150m t = 25c 2 led s a 33 36
AL8805 document number: ds35030 rev. 4 - 2 6 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 typical performance characteristics (cont.) (@t a = +25c, unless otherwise specified.) 80% 82% 84% 86% 88% 90% 92% 94% 96% 98% 100% 6 9 12 15 18 21 24 27 33 input voltage (v) figure 13 efficiency vs. input voltage effi c ien c y 30 36 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds l = 100h r = 150m t = 25c s a 2 leds 4 leds 5 leds 6 leds 8 leds input voltage (v) figure 14 330ma led current vs. input voltage led c u r r ent (a) 0.30 0.31 0.32 0.33 0.34 0.35 0.36 6 9 12 15 18 21 24 27 30 33 36 1 led 3 leds l = 68 h r = 300m t = 25c s a 7 leds 0 50 100 150 200 250 300 350 input voltage (v) figure 15 switching frequency vs. input voltage l = 100 h r = 150m t = 25c s a switching frequency (khz) 6 9 12 15 18 21 24 27 30 33 36 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 6 9 12 15 18 21 24 27 36 input voltage (v) figure 16 670ma led current vs. input voltage led current (a) 0.720 30 33 0.710 0.700 0.690 0.680 0.670 0.660 0.650 0.640 0.630 0.620 input voltage (v) figure 17 1a led current vs. input voltage l e d c u r r e n t ( a ) 0.90 0.95 1.00 1.05 1.10 6 9 12 15 18 21 24 27 30 33 36
AL8805 document number: ds35030 rev. 4 - 2 7 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 typical performance characteristics (cont.) (670ma led current) (@t a = +25c, unless otherwise specified.) 5% input voltage (v) figure 18 led current deviation vs. input voltage % error 6 9 12 15 18 21 24 27 30 33 36 4% 3% 2% 1% 0% -1% -2% -3% -4% -5% 0 50 100 150 200 250 300 350 input voltage (v) figure 19 switching frequency vs. input voltage f r e q u e n c y (khz) l = 100 h r = 150m t = 25c s a 6 9 12 15 18 21 24 27 30 33 36 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds input voltage (v) figure 20 led current deviation vs. input voltage -10% -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% % e r r o r 6 9 12 15 18 21 24 27 30 33 36 0 50 100 150 200 250 300 350 400 450 500 input voltage (v) figure 21 switching frequency vs. input voltage switching frequency (khz) 6 9 12 15 18 21 24 27 30 33 36 -10% -8% -6% -4% -2% 0% 2% 4% 6% 8% 10 % input voltage (v) figure 22 led current deviation vs. input voltage % e r r o r 69 12 15 18 21 24 27 30 33 36 input voltage (v) figure 23 switching frequency vs. input voltage 0 100 200 300 400 500 600 700 800 frequency (khz) 6 9 12 15 18 21 24 27 30 33 36 900
AL8805 document number: ds35030 rev. 4 - 2 8 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 typical performance characteristics (cont.) (1a led current) (@t a = +25c, unless otherwise specified.) 2 leds 3 leds 5 leds 6 leds 7 leds -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% input voltage (v) figure 24 led current deviation vs. input voltage l = 100 h r = 100m t = 25c s a % error -10% 6 9 12 15 18 21 24 27 30 33 36 1 led 4 leds 8 leds 0 50 100 150 200 250 input voltage (v) figure 25 switching frequency vs. input voltage s wit c h i n g f r e q u e n c y (k h z) 9 121518212427303336 6 2 leds 3 leds -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% input voltage (v) figure 26 led current deviation vs. input voltage l =68 h r = 100m t = 25c s a % error 6 9 12 15 18 21 24 27 30 33 36 8 leds 1 led 4 leds 5 leds 6 leds 7 leds 1 led 2 leds 3 leds 4 leds 6 leds 7 leds 8 leds 0 50 100 150 200 250 300 350 l = 68 h r = 100m t = 25c s a input voltage (v) figure 27 switching frequency vs. input voltage 6 9 12 15 18 21 24 27 30 33 36 5 leds s wit c hin g f r e q uen c y ( k hz) 1 led 2 leds 3 leds 5 leds 6 leds 8 leds -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% input voltage (v) figure 28 led current deviation vs. input voltage l = 33 h r = 100m t = 25c s a % error -10% 6 9 12 15 18 21 24 27 30 33 36 4 leds 0 100 200 300 400 500 600 input voltage (v) figure 29 switching frequency vs. input voltage 700 s wit c h i n g f r e q u e n c y (k h z) 6 9 12 15 18 21 24 27 30 33 36
AL8805 document number: ds35030 rev. 4 - 2 9 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 application information AL8805 operation in normal operation, when voltage is applied at +v in , the AL8805 internal switch is turned on. curr ent starts to flow through sense resistor r 1 , inductor l1, and the leds. the current ramps up linearly, and the ramp rate is determined by the input voltage +vin and the ind uctor l1. this rising current produces a voltage ramp across r 1 . the internal circuit of the AL8805 senses the voltage across r 1 and applies a proportional voltage to the input of the internal comparator. when this voltage reaches an internally set upper threshold, the internal switch is turned off. the inductor current continues to flow through r 1 , l1, the leds and the schottky diode d1, and back to the supply rail, but it decays, with the rate of decay determined by the fo rward voltage drop of the leds and the schottky diode. this decaying current produces a falling voltage at r 1 , which is sensed by the AL8805. a volt age proportional to the sense voltage across r 1 is applied at the input of the internal comparator. when this voltage falls to the internally set lower threshold, the internal sw itch is turned on again. this switch-on-and-off cycle continues to provide the average led current set by the sense resistor r 1 . led current control the led current is controlled by the resistor r 1 in figure 30. connected between v in and set the nominal average output current in the led(s) is defined as: set thd led r v i = if the ctrl pin is driven by an external voltage (higher than 0.4v and lower than 2.5v), the average led current is: set thd ref ctrl led r v v v i = for example for a desired led current of 660ma and a default voltage v ctrl =2.5v the resulting resistor is: ? = = m150 5.2 5.2 66.0 1.0 v v i v r ref ctrl led thd set figure 30 typical application circuit dc dimming the ctrl pin can be driven by an external dc voltage (v ctrl ), to adjust the output current to a va lue below the nominal average value defined by rset. the led current decreases linearly with the ctrl voltage when 0.5v v ctrl 2.5v, as in figure 2 for 4 different current levels. when the ctrl voltage falls below the threshold, 0.4v, t he output switch is turned off which allows pwm dimming. note that 100% brightness setting corresponds to v ctrl = v ref , nominally 2.5v. for any voltage applied on the ctrl pin that is higher than v ref , the device will not overdrive the led current and w ill still set the current according to the equation v ctrl = v ref . r 1 AL8805 1 l 1 v in set sw ctrl gnd c 1 c 2 d 1
AL8805 document number: ds35030 rev. 4 - 2 10 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 application information (cont.) pwm dimming led current can be adjusted digitally, by applying a low frequency pulse width modulated (pwm) logic signal to the ctrl pin to turn the device on and off. this will produce an average output current proportional to the duty cycle of the control signal. in particular, a pwm signal with a max resolution of 10bit can be applied to the ctrl pin to change the output current to a value below the nominal average value set by resistor r set . to achieve this resolution the pwm frequency has to be lower than 500hz, however higher dimming frequencies can be used, at t he expense of dimming dynamic range and accuracy. typically, for a pwm frequency of 500hz the accuracy is better than 1% for pwm ranging from 1% to 100%. figure 31 pwm dimming at 500hz figure 32 low duty cycle pwm dimming at 500hz the ctrl pin is designed to be driven by both 3.3v and 5v logic levels directly from a logic output with either an open drain output or push-pull output stage. 0 100 200 300 400 500 600 700 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% pwm dimming [%] led current [ma ] 0 10 20 30 40 50 60 70 0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% pwm dimming [%] led current [ma ] c AL8805 gnd ctrl c AL8805 gnd ctrl
AL8805 document number: ds35030 rev. 4 - 2 11 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 application information (cont.) soft start the AL8805 does not have in-built soft-start action ? this provides very fast turn off of the output the stage improving pwm di mming accuracy; nonetheless, adding an external capacitor from the ctrl pin to ground will provide a soft-start delay. this is achieved by incr easing the time taken for the ctrl voltage to rise to the turn-on threshold and by slowing down the rate of rise of the control voltage at the input of the comparator. adding a capacitor increases the ti me taken for the output to reach 90% of its final value, this delay is 0.1ms/nf, but will impact on the pwm dimming accuracy depending on the delay introduced. figure 33 soft start with 22nf capacitor on ctrl pin (v in = 36v, i led = 667ma, 1 led) reducing output ripple peak to peak ripple current in the led(s) can be reduced, if required, by shunting a c apacitor c2 across the led(s) as shown al ready in the circuit schematic. a value of 1 f will reduce the supply ripple current by a factor three (appr ox.). proportionally lower ripple can be achieved with higher ca pacitor values. note that the capacitor will not affect operating fr equency or efficiency, but it will increase start-up delay, by redu cing the rate of rise of led voltage. by adding this capacitor the current waveform through the led(s) changes from a triangular ramp to a more sinusoid al version without altering the mean current value. capacitor selection the small size of ceramic capacitors makes them ideal for a l8805 applications. x5r and x7r types are recommended because they r etain their capacitance over wider voltage and temperatur e ranges than other types such as z5u. a 2.2 f input capacitor is sufficient for most in tended applications of AL8805; however a 4.7 f input capacitor is suggested for input voltages approaching 36v.
AL8805 document number: ds35030 rev. 4 - 2 12 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 application information (cont.) diode selection for maximum efficiency and performance, the rectifier (d1) should be a fast low capac itance schottky diode with low reverse lea kage at the maximum operating voltage and temperature. the schottky diode al so provides better efficiency than silicon pn diodes, due to a combination of lower forward voltage and reduced recovery time. it is important to select parts with a peak current rating above the peak coil current and a continuous current rating higher t han the maximum output load current. in particular, it is recommended to have a diode voltage rating at least 15% higher than the operating voltage to ensure safe operation during the switching and a current rating at least 10% higher than the average diode current. the power rating is ve rified by calculating the power loss through the diode. schottky diodes, e.g. b240 or b140, with their low forward volt age drop and fast reverse recovery, are the ideal choice for al8 805 applications. thermal and layout considerations for continuous conduction mode of operati on, the absolute maximum junction temperatur e must not be exceeded. the maximum power dissipation depends on several factors: the thermal resistance of the ic package ja , pcb layout, airflow surrounding the ic, and difference between junction and ambient temperature. the maximum power dissipation can be ca lculated using the following formula: p d(max) = (t j(max) ? t a ) / ja where t j(max) is the maximum operating junction temperature, t a is the ambient temperature, and ja is the junction to ambient thermal resistance. the recommended maximum operating junction temperature, t j , is +125c and so maximum ambient temperature is determined by the AL8805?s junction to ambient thermal resistance, ja . ja , is layout dependent and the AL8805?s ja on a 25 x 25mm single layer pcb with 1oz copper standing in still air is approximately +250c/w (+160c/w on a four-layer pcb). the maximum power dissipation at t a = +25c can be calculated by the following formulas: p d(max) = (+125c ? +25c) / (250c/w) = 0.4w for single-layer pcb p d(max) = (+125c ? +25c) / (160c/w) = 0.625w for standard four-layer pcb figure 34, shows the power derating of the AL8805 on two (one single-layer and four-layer) different 25x25mm pcb with 1oz coppe r standing in still air. figure 34 derating curve for different pcb
AL8805 document number: ds35030 rev. 4 - 2 13 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 application information (cont.) thermal and layout considerations figure 35 gives details about the pcb layout suggestions: 1. the capacitor c1 has to be pl aced as close as possible to v in 2. the sense resistor r1 has to be placed as close as possible to v in and set 3. the d1 anode, the sw pin and the inductor have to be placed as close as po ssible to avoid ringing. figure 35 recommended pcb layout application example typical application example for the AL8805 is the mr16 lamp. they typically operate from 12v dc or 12v ac , using conventional electromagnetic transformers or electronic transformers. as a replacement in some halogen lamp applications leds offer a more energy efficient solution ? providing no radiated heat and no ultra violet light. this application example is intended to fit into the base c onnector space of an mr16 style led lamp. the design has been optimi zed for part count and thermal performance for a singl e 3w led in the lens section. figure 36 mr16 schematic an inductor choice of 33h with satura tion current higher than 1.1a, will limit the frequency variation between 230khz and 350k hz over the whole input voltage variation (8v to 18v), and therefore represent the best choice for an mr16 solution also taking into accoun t the size constraint of the lamp. the AL8805 guarantee high level of performance both with 12v ac and 12v dc power supply. the efficiency is generally higher than 81% and current regulation is better than 0.1ma/v in for a dc input voltage in the rang e from 8v to 18v. in table 1 can be found the bill of material of the mr16 application example. AL8805 AL8805
AL8805 document number: ds35030 rev. 4 - 2 14 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 application information (cont.) in figures 37 and 38 are displayed the top layer and the bottom layer of a typical pcb design for an mr16 solution. figure 37 top layer figure 38 bottom layer table1 mr16 application example bill of material quantity pcb ident value description suggested sources 1 u1 AL8805 led driver ic diodes zetex 1 d1, dfls240l freewheeling diode diodes zetex 4 d2, d3, d4, d5 sbr2a40 input bridge diodes zetex 1 r1 0r15 resistor, 0805, +/-1% <+/-300ppm generic koa sr732attdr150f kemet 1 c1 150uf 20v smd tantalum kemet d case, t491x157k020at kemet 0 c2 - not fitted 1 c3 100nf > = 25v x7r 0805 generic kemet c0805c104k5rac (50v) nic nmc0805x7r104k50trpf (50v) kemet nic components 1 c4 1uf > = 25v x7r 1206 generic kemet c1206105k5rac7800 (50v) nic nmc1206x7r105k50f (50v) kemet nic components 1 l1 33h lps6235 - 333mlb coilcraft
AL8805 document number: ds35030 rev. 4 - 2 15 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 ordering information al 8805 w5 - 7 package packing w5 :sot25 7 : tape & reel device package code packaging (note 6) 7? tape and reel quantity part number suffix AL8805w5-7 w5 sot25 3000/tape & reel -7 note: 8. pad layout as shown on diodes inc. suggested pad la yout document ap02001, which can be found on our website at: http://www.diodes .com/datasheets/ap02001.pdf . marking information 1 2 3 5 7 4 xx y w x (top view) xx : identification code w : week : a~z : 1~26 week; x : a~z : internal code y : year 0~9 a~z : 27~52 week; z represents 52 and 53 week part number package identification code AL8805w5-7 sot25 a6 package outline dimensions (all dimensions in mm.) sot25 dim min max typ a 0.35 0.50 0.38 b 1.50 1.70 1.60 c 2.70 3.00 2.80 d ? ? 0.95 h 2.90 3.10 3.00 j 0.013 0.10 0.05 k 1.00 1.30 1.10 l 0.35 0.55 0.40 m 0.10 0.20 0.15 n 0.70 0.80 0.75 0 8 ? all dimensions in mm a m j l d b c h k n
AL8805 document number: ds35030 rev. 4 - 2 16 of 16 www.diodes.com july 2012 ? diodes incorporated a l8805 suggested pad layout important notice diodes incorporated makes no warranty of any kind, express or implied, with regards to this document, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose (and their equivalents under the laws of any jurisdiction). diodes incorporated and its subsidiaries rese rve the right to make modifications, enhanc ements, improvements, corrections or ot her changes without further notice to this document and any product descri bed herein. diodes incorporated does not assume any liability arising out of the application or use of this document or an y product described herein; neither does di odes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or us er of this document or products described herein in such applica tions shall assume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on diodes incorporated website, harmless against all damages. diodes incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthoriz ed sales channel. should customers purchase or use diodes inco rporated products for any unintended or una uthorized application, customers shall i ndemnify and hold diodes incorporated and its representativ es harmless against all claims, damages, expenses, and attorney fees arising out of, directly or indirectly, any claim of personal injury or death a ssociated with such unintended or unauthorized application. products described herein may be covered by one or more united states, international or foreign patents pending. product names and markings noted herein may also be covered by one or more united states, international or foreign trademarks. life support diodes incorporated products are specifically not authorized for use as critical component s in life support devices or systems without the express written approval of the chief executive offi cer of diodes incorporated. as used herein: a. life support devices or syst ems are devices or systems which: 1. are intended to implant into the body, or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devic e or system whose failure to perform can be reasonably expect ed to cause the failure of the life support device or to affect its safety or effectiveness. customers represent that they have all necessary expertise in the safety and regulatory ramifi cations of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-rel ated requirements concerning the ir products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or s ystems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporate d and its representatives against any damages arisi ng out of the use of diodes incorporated pr oducts in such safety-critical, life suppor t devices or systems. copyright ? 2012, diodes incorporated www.diodes.com dimensions value (in mm) z 3.20 g 1.60 x 0.55 y 0.80 c1 2.40 c2 0.95 x z y c1 c2 c2 g

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