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al5812 document number: ds35616 rev. 1 - 2 1 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 60v, 150ma adjustable linear led driver description the al5812 is an adjustable linear led driver offering excellent temperature stability and output handling capability. the al5812 simplifies the design of linear and isolated or non-isolated led drivers by setting the led current with standard value resistors. the al5812 has an open drain output that can swing from 1v up to 60v enabling it drive long led chains. its low 0.5v r set pin is outside of the led current path and so accuracy is maintained while minimizing the required overheads to regulate the led current. this reduces its power dissipation w hen compared to traditional linear led drivers. this makes it ideal for driving leds up to 150ma (commonly referred to as ?w leds). longer led chains can be driven by tapping v cc from the chain, where the chain voltage may exceed 60v. the al5812 is available in the exposed pad msop-8ep and u-dfn3030-6 packages. features ? low reference voltage (v rset = 0.5v) ? -40c to +125c temperature range ? 3% led current tolerance ? low temperature drift ? 1v to 60v open-drain output ? high power supply rejection ? msop-8ep and u-dfn3030-6 ? totally lead-free & fully rohs compliant (notes 1 & 2) ? halogen and antimony free. ?green? device (note 3) pin assignments led nc nc gnd r set nc nc v cc 1 2 3 4 8 7 6 5 (top view) msop-8ep u-dfn3030-6 (top view) led nc gnd v cc nc r set 3 2 1 4 5 6 exposed pad applications ? isolated offline led converters ? linear led driver ? led signs ? instrumentation illumination 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 al5812 led gnd v cc r set v in r 7k5 set c0.1f in al5812 led gnd v cc r set r 7k5 set v in c0.1f in
al5812 document number: ds35616 rev. 1 - 2 2 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 pin descriptions pin name pin number (msop8-ep) pin number (u-dfn3030-6) function v cc 1 1 power supply input. connect a 0.1 f ceramic capacitor between v cc and gnd as close as possible to the device. r set 4 3 led current setting pin. connect a resistor from this pin to gnd: i led = 750/r set may also be used to provide pwm dimming functionality. gnd 5 4 ground reference point of device. led 8 6 led current sink output. nc 2, 3, 6, 7 2, 5 no connection. ep ep ep exposed pad (bottom). used to improve thermal impedance of package. it must be connected to gnd directly underneath the package but not used as sole gnd potential terminal. functional block diagram
al5812 document number: ds35616 rev. 1 - 2 3 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 absolute maximum ratings (@t a = +25c, unless otherwise specified.) symbol parameters ratings unit v cc supply voltage relative to gnd pin (note 4) -0.3 to +66 v v led led pin voltage relative to gnd pin (note 4) -0.3 to +66 v v rset r set pin voltage relative to gnd -0.3 to +6 v i led led pin current sink current range 165 ma esd hbm human body model esd protection 1 kv esd cdm charged device model esd protection 1.2 kv t j operating junction temperature -40 to +150 c t st storage temperature -55 to +150 c note: 4.v cc pin can be greater or smaller than v led ; neither should go below gnd. caution: stresses greater than the 'absolute maximum ratings' specified above, may cause permanent damage to the device. these are stress ratings only; functional operation of the device at th ese or any other conditions exceeding those indicated in this specification is not imp lied. 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 exposure to esd events. suitable esd precautions should be take n when handling and transporting these devices. package thermal data package jc thermal resistance junction-to-case (note 7) ja thermal resistance junction-to-ambient (note 7) p dis t a = +25c, t j = +125c (note 7) msop-8ep 39 90c/w (note 5) 1.1w u-dfn3030-6 14 69c/w (note 6) 1.47w notes: 5. test condition for msop-8ep: device mounted on fr-4 pcb (51mm x 51mm 2oz copper, minimum recommended pad layout on to p layer and thermal vias to bottom layer ground plane. for better thermal performance, larger copper pad for heat-sink is needed. 6. test condition for u-dfn3030-6: devi ce mounted on fr-4 pcb (51mm x 51mm 2oz copper, minimum recommended pad layout on top l ayer and thermal vias to bottom layer with maximum area ground plane. for better thermal performance, larger copper pad for heat-si nk is needed 7. dominant conduction path via exposed pad. recommended operating conditions (@t a = +25c, unless otherwise specified.) symbol parameter min max unit v cc supply voltage range relative to gnd pin 3.5 60 v v led led pin output voltage range relative to gnd pin 1 60 i led led pin current (notes 8 & 9) 10 150 ma t a operating ambient temperature range -40 +125 c notes: 8. for improved accuracy led current should be greater than 60ma. 9. maximum led current is also limited by ambient temperature and power dissipation such that junction temperature should be kept less than or equal to +125c.
al5812 document number: ds35616 rev. 1 - 2 4 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 electrical characteristics (@t a = +25c, v cc = 3.5v, v led =1v (note 10), r set = 7.5k ? unless otherwise specified.) symbol parameter conditions min typ max unit v rset r set voltage t a = -40c to +125c 0.5 v i led i led current accuracy r set = 12.5k ? t a = +25c 57 60 63 ma r set = 4.99k ? 142.5 150 157.5 r set = 7.5k ? 97 100 103 t a = -40c to +125c 95 105 reg line led current line regulation v cc = 3.5v to 60v t a = +25c 0.25 % uvlo under voltage lockout t a = -40c to +125c 2 v i cc supply current 3.5v v cc 60v t a = +25c 320 400 a t a = -40c to +125c 500 i leak led pin leakage current v cc = v led = 60v r set = open circuit t a = +125c 1 a t shdn thermal shutdown 155 q c t hys thermal shutdown hysteresis 20 q c note: 10. all voltages unless ot herwise stated are measured with respect to gnd pin.
al5812 document number: ds35616 rev. 1 - 2 5 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 typical performance characteristics 145 140 120 100 60 40 20 0 80 0 5 10 15 20 25 30 35 40 45 50 55 60 input voltage (v) figure 1 led current vs. input voltage l e d c u r r e n t ( m a) v = 1.2v t = +25c led a r = 4.99k set r = 7.5k set r = 12.4k set -40 -25 -10 5 temperature (c) figure 2 led current vs. ambient temperature 20 35 50 65 80 95 110 125 l e d c u r r e n t ( m a) r = 4.99k set r = 7.5k set r = 12.4k set v = 1.2v v = 3.5v led cc 160 140 120 100 80 60 40 20 0 0 5 10 15 20 25 30 led voltage (v) figure 3 led current vs. led pin voltage (note 11) led current (ma) v = 3.5v t = +25c in a r = 4.99k set r = 7.5k set r = 12.4k set 0 0.5 1.0 1.5 2.0 2.5 3.0 led voltage (v) figure 4 led current vs. led pin voltage zoomed led c u r r ent (ma) 160 140 120 100 80 60 40 20 0 v = 3.5v t = +25c in a r = 12.4k set r = 4.99k set r = 7.5k set 0 5 10 15 20 25 30 35 40 45 input voltage (v) figure 5 led current vs. input voltage - 2 leds (note 11 & 12) 160 140 120 100 80 60 40 20 0 led current (ma) t = +25c a 2 leds r = 12.4k set r = 4.99k set r = 7.5k set 0246810121416182022 input voltage (v) figure 6 led current vs. input voltage 2 leds - high side drive (notes 11, 12 &13) l e d c u r r e n t (m a ) 160 140 120 100 80 60 40 20 0 t = +25c v pin tied to led pin 2 leds a cc r = 12.4k set r = 4.99k set r = 7.5k set notes: 11. these curves have been limited at la rger input voltages due to power dissipation. 12. lower input voltage range is limited by the led chain voltage 13. the al5812 has its v cc pin connected to its led pin, which are c onnected to the positive input supply voltage. r set is connected to al5812 gnd pin, which is connected to the anode of the led chain. this creates a high side driver of the led chain. see figure 15.
al5812 document number: ds35616 rev. 1 - 2 6 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 typical performance characteristics (cont.) t = +25c 2 leds r = 7.5k f = 100hz a set pwm 10 20 09 0 1 0 0 80 40 50 30 7060 duty cycle (%) figure 7 led current vs. pwm duty cycle 110 100 90 80 70 60 50 40 30 20 10 0 led c u r r e n t (ma) 125 160 130 155 140 145 150 135 temperature (c) figure 8 led current vs. t shdn led c u r r e n t (ma) 14 12 10 6 2 -2 8 4 0 t shdn t hys v = 9v r = 75k in set 0 5 10 15 20 25 30 35 40 45 50 55 60 input voltage (v) figure 9 r voltage vs. input voltage set 0.500 0.495 0.490 0.485 0.480 0.475 r v o l t a g e (v) set v = 1.2v t = +25c led a r = 7.5k set r = 7.5k set -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature (c) figure 10 r voltage vs. ambient temperature set 0.500 0.495 0.490 0.485 0.480 0.475 r v o l t a g e (v) set v = 1.2v v = 3.5v led in 0 5 10 15 20 25 30 35 40 45 50 55 60 input voltage (v) figure 11 supply current vs. input voltage 400 350 300 250 200 150 100 50 0 s u p p l y c u r r en t (a) v = 1.2v t = +25c led a r = 4.99k set r = 7.5k set r = 12.4k set s u p p l y c u r r en t (a) 350 300 250 200 150 100 50 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 temperature (c) figure 12 supply current vs. ambient temperature r = 4.99k set r = 7.5k set r = 12.4k set v = 1.2v v = 3.5v led in
al5812 document number: ds35616 rev. 1 - 2 7 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 application information description the al5812 is a linear led driver and in normal operation has the leds connected to the same potential as its v cc pin and regulates the led current by sinking current into to its led pin see figure 13. the led current is set by the use of an external resistor, r set , connected from the r set pin to gnd. this resistor supplies the bias current of the al5812 together with current regulator to set the led current. the nominal led current is determined by this equation: set led r 5.0 *1500 i = where 1500 is the current ratio between the led pin current and r set pin current. with r set = 7.5k ma100 k5.7 5.0 *1500 i led = = the al5812 with its 60v capability on its supply pin, v cc , and its led drive pin allows it to operate from supply rails up to 60v and/or directly drive led chains up to 60v as shown in fi gures 13 and 14. the voltage applied to the v cc pin can be greater or lower than the voltage applied to the led string. figure 14 shows where you might control it from a 5-v rail but power the rails from a 12v rail. al5812 v cc led gnd r set r set = 7.5k ? v in c in 0.1f figure 13 low side current led setting al5812 v cc led gnd r set r set = 4.99k ? v in c in 0.1f v led figure 14 low side drive ? separate supplies high voltage operation an extension of figure 14 is to derive the power for the al5812 from the led chain itself see figure 15. led chains greater tha n 60v can be driven in this manner as long pwm dimming is not utilized. al5812 v cc led gnd r set r set = 7.5k ? v in c in 0.1f figure 15 low side led string tapping v in c in 0.1f al5812 v cc led gnd r set r set = 4.99k ? figure 16 high side current led string the al5812 can also be used on the high side of the leds, see figure 16. this is a simp le way of extending the maximum led chai n voltage, however, it does increase the minimum system input voltage to: v in(min) = v led_chain + 3.5v. where v led_chain is the led chain voltage.
al5812 document number: ds35616 rev. 1 - 2 8 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 application information (cont.) pwm dimming the al5812 can be used to provide le d current dimming driving the r set pin via the current setting resistor (r set ) and a series mosfet switch to ground (figure 17). the r set pin current is then effectively switched on and off caus ing the led current to turn on and off. the linearity is shown in figure 18. al5812 v cc led gnd r set r set v in pwm-dim c in 0.1f figure 17 pwm dimming t = +25c 2 leds r = 7.5k f = 500hz a set pwm 10 20 09 0 1 0 0 80 40 50 30 7060 duty cycle (%) figure 18 pwm dimming linearity 110 100 90 80 70 60 50 40 30 20 10 0 l e d c u r r e n t (m a ) thermal considerations when designing linear led drivers careful consideration must be given to: 1. the power dissipation within the led driver and 2. pcb layout/heat sinking. a linear led driver has to be able to handle the large potential input voltage variations due to the supply voltage tolerance a nd also the variation in led forward voltage due to binning and temperature. this can result in a large potential difference across the led dr iver resulting in a larger than anticipated power dissipation. for example in an 12v powered system with a 5% output voltage tolerance; the input voltage could typically vary from 12.6v down to 11.4v driving 3 leds with a voltage varying from 3v to 3.5v at 100ma. this means that the led driver has to cope with a voltage drop across varying from approximately 3.6v to 0.9v. this means that the power dissipation of the al5812 could be as much as 366mw. figure 19 below shows how the al5812?s power dissipation capability va ries with package; these values will vary with pcb size a nd area of metal associated with the ground plane used for heat sinking. by increasing the area on the top layer the thermal impedance of both packages could be improved. -40 -25 -10 5 20 35 50 65 80 95 110 125 ambient temperature (c) figure 19 power dissipation derating 1.6 1.4 0.2 0.0 0.6 0.4 1.0 0.8 1.2 p o w e r di s s i p a t i o n (w) u-dfn3030-6 msop-8ep
al5812 document number: ds35616 rev. 1 - 2 9 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 ordering information al5812 xx - xx package ff : u-dfn3030-6 mp : msop-8ep packing 7 : 7? tape & reel 13 : 13? tape & reel device package code packaging 7?/13? tape and reel quantity part number suffix al5812mp-13 mp msop-8ep 2500/tape & reel -13 AL5812FF-7 ff u-dfn3030-6 3000/tape & reel -7 marking information (1) msop-8ep (2) u-dfn3030-6 xx : identification code ( top view ) x : a~z : green xy x x w y : year : 0~9 w : week : a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week part number package identification code AL5812FF-7 u-dfn3030-6 b9 a~z : green msop-8ep y : year : 0~9 w : week: a~z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week (top view) logo part number 8 7 6 5 y w x e al5812 1 2 3 4
al5812 document number: ds35616 rev. 1 - 2 10 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 package outline dimensions (all dimensions in mm.) please see ap02002 at http://www.diodes.com /datasheets/ap02002.pdf for latest version. (1) msop-8ep (2) u-dfn3030-6 msop-8ep dim min max typ a - 1.10 - a1 0.05 0.15 0.10 a2 0.75 0.95 0.86 a3 0.29 0.49 0.39 b 0.22 0.38 0.30 c 0.08 0.23 0.15 d 2.90 3.10 3.00 d1 1.60 2.00 1.80 e 4.70 5.10 4.90 e1 2.90 3.10 3.00 e2 1.30 1.70 1.50 e3 2.85 3.05 2.95 e - - 0.65 l 0.40 0.80 0.60 a 0 8 4 x - - 0.750 y - - 0.750 all dimensions in mm u-dfn3030-6 dim min max typ a 0.57 0.63 0.60 a1 0 0.05 0.02 a3 ? ? 0.15 b 0.29 0.39 0.34 d 2.9 3.1 3.0 d2 2.65 2.85 2.75 e 2.9 3.1 3.0 e ? ? 1.205 e2 1.76 1.96 1.86 l 0.30 0.60 0.45 all dimensions in mm 1 d a a1 a2 e e y x seating plane gauge plane l d 8xb see detail c detail c c a e1 e3 a3 e2 4 x 1 0 4 x 1 0 0.25 d1 d a1 a a3 e2 e b l e d2
al5812 document number: ds35616 rev. 1 - 2 11 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 suggested pad layout please see ap02001 at http://www.diodes.com/ datasheets/ap02001.pdf for latest version. (1) msop-8ep (2) u-dfn3030-6 dimensions value (in mm) c 0.650 g 0.450 x 0.450 x1 2.000 y 1.350 y1 1.700 y2 5.300 dimensions value (in mm) z 2.75 g 0.57 x1 1.86 x2 0.45 y 0.34 c 1.205 g x c y y2 y1 x1 x1 g x2 z c y
al5812 document number: ds35616 rev. 1 - 2 12 of 12 www.diodes.com september 2012 ? diodes incorporated new product a l5812 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 a nd 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

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