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al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 1 of 16 www.diodes.com march 2011 ? diodes incorporated 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 30v. 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. pin assignments 4set 5v in sw 1 ctrl 3 gnd 2 (top view) sot25 features ? led driving current up to 1a ? better than 5% accuracy ? high efficiency up to 98% ? operating input voltage from 6v to 30v ? 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 (note 1) applications ? mr16 lamps ? general illumination lamps notes: 1. eu directive 2002/95/ec (rohs). all applicab le rohs exemptions applied. please visit our website at http://www.diodes.com /products/lead_free.html . typical application circuit
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 2 of 16 www.diodes.com march 2011 ? diodes incorporated absolute maximum ratings 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 -0.3~36 v v sw sw voltage relative to gnd -0.3~36 v v ctrl ctrl pin input voltage -0.3 ~ 6 v i sw switch current 1.25 a t j junction temperature 150 c t lead lead temperature soldering 300 c t st storage temperature range -65 to +150 c caution: the absolute maximum ratings are rated values exceedi ng which the product could suffer physical damage. these values m ust therefore not be exceeded under any condition. semiconductor devices are esd sens itive and may be damaged by exposure to esd events. suitable es d precautions should be taken when handling and transporting these devices recommended operating conditions symbol parameter min max unit v in operating input voltage relative to gnd 6.0 30 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 pin descriptions pin name pin number descriptions sw 1 switch pin. connect inductor/freewheeling diode here, minimizing track length at this pin to reduce emi. gnd 2 gnd pin ctrl 3 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. set 4 set nominal output current pin. c onfigure the output current of the device. v in 5 input supply pin. must be locally decoupled to gnd with > 2.2f x7r ceramic capacitor ? see applications section for more information.
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 3 of 16 www.diodes.com march 2011 ? diodes incorporated electrical characteristics v in =12v, t a =25 o c, 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 ? 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 inte rnal 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 sot25 (note 3) 250 c/w notes: 2. refer to figure 34 for the device derating curve. 3. test condition for sot25: device mounted on fr-4 pcb (25m m 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. ?. al8805 does not have a low power standby mode but current cons umption is reduced when output switch is inhibited: v sense = 0v. parameter is tested with v ctrl 2.5v
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 4 of 16 www.diodes.com march 2011 ? diodes incorporated typical performance characteristics (t a = 25c unless otherwise stated) 0 50 100 150 200 250 300 350 400 0 5 10 15 20 25 30 v (v) fig. 1 supply current (not switching) vs. input voltage in i (a ) in v = 0v v = v t = 25c crtl set in a 0 100 200 300 400 500 600 700 800 900 012345 v(v) fig. 2 switching frequency vs. v ctrl ctrl f r e q u en c y (k h z) 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 0 1 2345 v (v) fig. 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) fig. 4 i vs. v ctrl ctrl ctrl i (a) ctrl v = v = 12v t = 25c set in a 0 0.5 1 1.5 2 2.5 3 0 5 10 15 20 25 30 v (v) fig. 5 v vs. input voltage in ctrl (ctrl pin open circuit) v (v ) ctrl v = open v = v t = 25c crtl set in a 2.48 2.49 2.50 2.51 2.52 -40 -15 10 35 60 85 110 ambient temperature (c) fig. 6 v vs. temperature ctrl v (v) ctrl v = open v = v = 12v ctrl set in
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 5 of 16 www.diodes.com march 2011 ? diodes incorporated typical performance characteristics continued (t a = 25c unless otherwise stated) 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 fig. 7 i vs. pwm duty cycle led led c u r r en t e r r o r (%) v = 12v 1 led r = 150m in set l = 68h led current error i led 0 50 100 150 200 250 300 0 51015202530 v (v) fig. 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) fig. 9 sw r vs. temperature ds(on) r(m) ds(on) v = open v = v = 12v ctrl set in 80 85 90 95 100 105 110 115 120 125 130 024 68 -2 0 2 4 6 8 10 12 14 16 18 time (s) fig. 10 sw output switching characteristics v sw v(mv) sense r = 150m v = 12v 1 led load set in l = 68h 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) fig. 11 pwm dimming 0 2 4 6 8 10 12 14 16 18 20 duty cycle = 5% switch and c tr l voltage (v) led current (a) r = 1 5 0m , l =6 8 h, v = 12 v, 1l e d l oa d , t = 25 c set in a ? 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% 6 9 12151821242730 input voltage (v) fig. 12 duty cycle vs. input voltage d u t y c y c le l = 33h r = 150m t = 25c 2 led s a
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 6 of 16 www.diodes.com march 2011 ? diodes incorporated typical performance characteristics (cont.) (t a = 25c unless otherwise stated) 80% 82% 84% 86% 88% 90% 92% 94% 96% 98% 100% 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 13 efficiency vs. input voltage effi c ien c y 5 leds 4 leds 6 leds 8 leds 7 leds 3 leds 2 leds 1 led l = 100 h r = 150m t = 25c s a 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds l = 68 h r = 300m t = 25c s a 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 14 330ma led current vs. input voltage 0.27 0.29 0.31 0.33 0.35 0.37 0.39 led c u r r en t ( a ) 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 100 200 300 400 500 600 700 800 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 15 switching frequency vs. input voltage l = 68 h r = 300m t = 25c s a switching frequency (khz) 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0.55 0.6 0.65 0.7 0.75 0.8 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 16 670ma led current vs. input voltage l = 68 h r = 150m t = 25c s a led current (a) 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 17 1a led current vs. input voltage l e d c u r r e nt (a) l = 68 h r = 100m t = 25c s a
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 7 of 16 www.diodes.com march 2011 ? diodes incorporated typical performance characteristics (670ma led current) (t a = 25c unless otherwise stated) ? 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds -10% -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 18 led current deviation vs. input voltage l = 100 h r = 150m t = 25c s a % error 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 50 100 150 200 250 300 350 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 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 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 20 led current deviation vs. input voltage ? -10% -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% % e r r o r l = 68 h r = 150m t = 25c s a 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 50 100 150 200 250 300 350 400 450 500 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 21 switching frequency vs. input voltage l = 68 h r = 150m t = 25c s a switching frequency (khz) 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds -10% -8% -6% -4% -2% 0% 2% 4% 6% 8% 10 % 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 22 led current deviation vs. input voltage l = 33 h r = 150m t = 25c s a % error 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 23 switching frequency vs. input voltage 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 100 200 300 400 500 600 700 800 l = 33 h r = 150m t = 25c s a frequency (khz)
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 8 of 16 www.diodes.com march 2011 ? diodes incorporated typical performance characteristics (1a led current) (t a = 25c unless otherwise stated) 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds -8% -6% -4% -2% 0% 2% 4% 6% 8% 10% 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 24 led current deviation vs. input voltage l = 100 h r = 100m t = 25c s a % error -10% 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 50 100 150 200 250 l = 100 h r = 100m t = 25c s a 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 25 switching frequency vs. input voltage s wi t c hing f r e q u e n c y (khz) 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds -8% -6% -4% -2% 0% 2% 4% 6% 8% 10 % 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 26 led current deviation vs. input voltage l =68 h r = 100m t = 25c s a % error -10% 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 50 100 150 200 250 300 350 l = 100 h r = 100m t = 25c s a 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 27 switching frequency vs. input voltage 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds -8% -6% -4% -2% 0% 2% 4% 6% 8% 10 % 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 28 led current deviation vs. input voltage l = 33 h r = 100m t = 25c s a % error -10% 1 led 2 leds 3 leds 4 leds 5 leds 6 leds 7 leds 8 leds 0 100 200 300 400 500 600 l = 33 h r = 100m t = 25c s a 6 9 12 15 18 21 24 27 30 input voltage (v) fig. 29 switching frequency vs. input voltage
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 9 of 16 www.diodes.com march 2011 ? diodes incorporated applications information al8805 operation in normal operation, when voltage is applied at +v in , the al8805 internal switch is turned on. current 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 inductor 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 forward 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 voltage proportional to the sense voltage across r 1 is applied at the input of the intern al comparator. when this voltage falls to the internally set lower threshold, the internal switch 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 curr ent in the led(s) is defined as: set thd led r v i = if the ctrl pin is driven by an external voltage (higher th an 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 r 1 al8805 1 l 1 v in set sw ctrl gnd c 1 c 2 d 1 figure 30. typical application curcuit dc dimming the ctrl pin can be driven by an external dc voltage (v ctrl ), to adjust the output current to a value 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, the 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 will st ill set the current according to the equation v ctrl = v ref .
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 10 of 16 www.diodes.com march 2011 ? diodes incorporated applications 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 curre nt proportional to the dut y cycle of the control signa l. 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 the 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%. 0 100 200 300 400 500 600 700 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% pwm dimming [%] led current [ma ] figure 31. pwm dimming at 500hz 0 10 20 30 40 50 60 70 0% 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% pwm dimming [%] led current [ma ] 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. c al8805 gnd ctrl c al8805 gnd ctrl
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 11 of 16 www.diodes.com march 2011 ? diodes incorporated applications 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 dimming accuracy; nonetheless, adding an external capacitor from the ctrl pin to ground will provide a soft-start delay. this is achieved by increasing 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. a dding a capacitor increases the time 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 c trl pin (v in = 30v, i led = 667ma, 1 led) reducing output ripple peak to peak ripple current in the led(s) can be reduced, if r equired, by shunting a capacitor c2 across the led(s) as shown already in the circuit schematic. a value of 1 f will reduce the supply ripple current by a factor th ree (approx.). proportionally lower ripple can be achieved with higher capacitor values. note that the capacitor will not affect operating frequency or efficiency, but it will increase start- up delay, by reducing 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 sinusoidal version without altering the mean current value. capacitor selection the small size of ceramic capacitors makes them ideal for al8805 applications. x5r and x7r types are recommended because they retain their capacitance over wider voltage and temperature ranges than other types such as z5u. a 2.2 f input capacitor is sufficient for most intended applications of al8805; however a 4.7 f input capacitor is suggested for input voltages approaching 30v.
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 12 of 16 www.diodes.com march 2011 ? diodes incorporated applications information (cont.) diode selection for maximum efficiency and performance, the rectifier (d1) should be a fast low capacitance schottky diode with low reverse leakage at the maximum operating voltage and temperature. the schottky diode also 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 verified by calculating the power loss through the diode. schottky diodes, e.g. b240 or b140, with their low forward voltage drop and fast reverse recovery, are the ideal choice for al8805 applications. thermal and layout considerations for continuous conduction mode of operation, the absolute maximum junction temperature 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 calculated 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 25x25mm 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 copper standing in still air. figure 34. derating curve for different pcb
al8805 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 13 of 16 www.diodes.com march 2011 ? diodes incorporated applications information (cont.) figure 35 gives details about the pcb layout suggestions: 1. the capacitor c1 has to be placed 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 possible 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 connector space of an mr16 style led lamp. the design has been optimized for part count and thermal performance for a single 3w led in the lens section. al8805 al8805 figure 36. mr16 schematic an inductor choice of 33h with saturation current higher than 1.1a, will limit the frequency variation between 230khz and 350khz over the whole input voltage variation (8v to 18v), and therefore represent the best choice for an mr16 solution also taking into account 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 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 14 of 16 www.diodes.com march 2011 ? diodes incorporated applications 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 table 1. mr16 application example bill of material quantity pcb ident value description suggested sources 1 u1 al8805 led driver ic diodes 1 d1, dfls240l freewheeling diode diodes 4 d2, d3, d4, d5 sbr2a40 input bridge diodes 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 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 15 of 16 www.diodes.com march 2011 ? diodes incorporated ordering information al 8805 w5 - 7 package packing w5 :sot25 7 : tape & reel device package code packaging (note 4) 7? tape and reel quantity part number suffix AL8805W5-7 w5 sot25 3000/tape & reel -7 notes: 4. pad layout as shown on di odes inc. suggested pad layout document ap 02001, which can be found on our website at http ://www.diodes.com/dat asheets/ap02001.pdf. marking information (1) sot25 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) (1) package type: sot25 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 high efficiency 30v 1a buck led driver al8805 document number: ds35030 rev. 2 - 2 16 of 16 www.diodes.com march 2011 ? diodes incorporated 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 reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to this document and any product described herein. diodes incorporated does not assume any liabi lity arising out of the application or use of this document or any product described herein; neither does diodes incorporated convey any license under its patent or trademark rights, nor the rights of others. any customer or user of this document or products desc ribed herein in such applications 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 incorporated products for any unintended or unauthorized application, customers shall indemnify and hold diodes incorporated and its representatives harmless against all claims, damages, expenses, and attorney fee s arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized a pplication. 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 components in life support devices or systems without the express written approval of the chief executive officer of diodes incorporated. as used herein: a. life support devices or systems 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 properly 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 device or system whose failure to perform can be reasonably expected 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 ramifications of their life support dev ices or systems, and acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any use of diodes incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related information or support that may be provided by diodes incorporated. further, customers must fully indemnify diodes incorporated and its representatives against any damages arising out of the use of diodes incorporated products in such safety-critical, life support devices or systems. copyright ? 2011, diodes incorporated www.diodes.com

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