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MIC4830 low noise 180vp-p el driver mlf and micro l ead fra m e are registered tradem ark of amkor tec hnologies micrel inc. ? 2180 fortu ne drive ? san jose, ca 95131 ? usa ? tel +1 ( 40 8 ) 944 -08 00 ? fax + 1 (408) 474-1000 ? htt p :/ /www.micrel.com septembe r 2 007 m999 9-09 130 7 (408) 95 5-16 9 0 general description the mic4 83 0 is a lo w n o ise 1 80vp - p electrolumin escent lamp (el ) dri v er. using a d vanced bipo lar, cmos, dmos (bcd) te chn o logy, the mic48 30 integ r ates a hig h voltage boo st conve r ter and a n h-bridg e drive r for driving a l a rg e el lamp. th e mic48 30 can drive l a rg e pan el displ a ys for mobile p h o nes, m u ltimedia pl ayers o r auto m otive electroni cs where el p ane ls are u s e d for backlig hting . the mi c4830 offers desi gn flex ibility with adjustable lamp and bo ost conve r ter fre quen cie s , si mply by ap plying external resi stors. a ne w h-bri dge de si gn re du ce s a udible noise by cre a ting sm ooth e r ac voltag e acro ss th e el panel. the mi c48 3 0 is offere d in mlf ? 3 mm 3mm and m s op- 8 pb-fre e an d ro hs com p liant pa ckag ing with a ?4 0c t o 85 c jun c tion temperatu r e rang e. data sheet s and suppo rt doc umentatio n can be fou nd o n micrel?s web site at www. micrel.com. fe ature s ? 1.8v to 5.5v input voltage ? 180vp p outp u t voltage ? low a udibl e noise el driv e wavefo rm ? suppo rts el panel sizes u p to 4in 2 (25 c m 2 ) ? low 4 5 a op eratin g su ppl y current ? small inductor si ze with low profile (220h) ? tiny 3mm 3 mm mlf ? -8 l p a c k a ge ? adjusta b le bo ost co nverte r frequ en cy ? adjustable el lamp frequency ? low 1 0na sh utdown cu rre n t applicati o ns ? lcd pan el ba ckli ght ? m o b ile ph on es ? pdas ? pagers ? cal c ulato r s ? multimedia pl ayers ? r e mote c o ntrols ? gps receivers ____ ___ ___ _ ____ ___ ___ _ ____ ___ ___ _ ____ ___ ___ _ ____ ___ ___ _ ____ ___ ___ _ ____ ___ ___ _ ____ ___ ___ _ ____ ___ __ ty pical a pplic ation lo w n o ise el d r iv er
micrel mic48 3 0 septembe r 2 007 2 m999 9-09 130 7 (408) 95 5-16 9 0 ordering information part nu mb er ju n c tio n t e mp . ran g e pack ag e mic483 0yml ?40c to + 85 c 8-pin 3mm 3mm mlf ? mic483 0ymm ?40c to + 85 c 8-pin mso p pin c onfi gur ation 8-pin mso p pack ag e (mm) 8-pin 3mm 3mm mlf ? (m l ) ? top vie w pin d e s c r i ption pin numbe r pin na me pin f unc tio n 1 vdd supp l y (in put): 1.8v to 5.5v for interna l circuit r y . 2 r s w s w itc h res i sto r (externa l co mpon ent): set s w itc h frequ en c y of the inter n al po w e r mo sf et b y con nectin g an e x tern al r e sistor to vdd. conn ectin g the ext e rna l resisto r to g nd disab les the s w itch oscill ator an d shuts do w n t he devic e. 3 r e l el resistor (e xtern a l c o mpo nent): set el frequ enc y of the interna l h-bri d ge driver b y co nn ecting a n e x ter nal res i stor to vdd. con necti ng the e x ter nal resistor to g nd disa bles the el oscil l ator. 4 g nd g r ound 5 sw s w itc h no de (input): interna l hig h -volta ge p o w e r mo sf et drain. 6 c s reg u late d boo s t o u tput (external c o mpo n e n t): connect to the output cap a citor of the boost re gul ator an d co nnec t to the ca thode of the d i ode. 7 vb el o u tput: connect to on e e nd of the el la mp. polarit y is not importa nt. 8 va el o u tput: connect to on e e nd of t he el la mp. polarit y is not importa nt.
micrel MIC4830 september 2007 3 m9999-091307 (408) 955-1690 absolute maximum ratings (1) supply voltage (v dd )...................................... ?0.5v to 6.0v output voltage (v cs ) ..................................... ?0.5v to 120v el lamp terminal s (va, vb) ................................. v cs + 3v switch voltage (vsw)??????????..-0.5v to 120v frequency control voltage (v rsw , v rel ) ................................... ?0.5v to (v dd +0.3v) storage temperature (t s ).........................?65c to +150c esd rating (4) ............................................................... 1.5kv operating ratings (2) supply voltage (v dd ).................................... +1.8v to +5.5v lamp drive frequency (f el ) ....................... 60hz to 1000hz switching frequency (f sw ).........................65khz to 250khz ambient temperature (t a ) .......................... ?40c to +85c package thermal resistance (3) msop ( ? ja ) ......................................................206 c/w mlf ? -8l ( ? ja ).....................................................63c/w electrical characteristics (5) v in = v dd = 3.0v, r sw = 332k ?, r el = 1.78m ?. t a = 25c unless otherwise specified. bold values indicate ? 40c t a +85c. parameter condition min typ max units on-resistance i sw = 100ma 3.8 7 ohm cs voltage variation v dd = 1.8v to 5.5v 76 88 99 v enable input low voltage (turn-off) v dd = 1.8v to 5.5v 0.5 v enable input high voltage (turn-on) v dd = 1.8v to 5.5v v dd - 0.5 v shutdown current r sw resistor = low; r el resistor = low; v dd = 5.5v 0.01 0.5 a input supply current r sw resistor = high; r el resistor = high; v cs = 90v; v a , v b open 45 75 a input current including inductor v in = v dd = 3.2v; rsw = 290k ? ; rel = 1.78m ?; l=220h; rout=10k ? ; lamp = 2in 2 15 ma v a ?v b output drive frequency r el =1.78m ? 158 200 242 hz switching transistor frequency r sw =332k ? 90 112 134 khz switching transistor duty cycle 90 % notes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. the maximum allowable power dissipation of any t a (ambient temperature) is p d(max) = (t j(max) ? t a ) / t ja . exceeding the maximum allowable power dissipation will result in excessive die temperature. 4. devices are esd sensitive. handli ng precautions recommended. human body model, 1.5k in series with 100pf. 5. specification for packaged product only.
micrel mic48 3 0 septembe r 2 007 4 m999 9-09 130 7 (408) 95 5-16 9 0 ty pical characteri stics
micrel mic48 3 0 septembe r 2 007 5 m999 9-09 130 7 (408) 95 5-16 9 0
micrel mic48 3 0 septembe r 2 007 6 m999 9-09 130 7 (408) 95 5-16 9 0 functi onal dia g ra m f i g u re 1. mic 483 0 blo ck diag ram functi onal de scri p tion ov erv i e w the mi c48 3 0 is a high -volt age e l d r iver with an ac output voltag e of 180v pea k-to -pe a k ca pabl e o f driving el lamps up to 4 i n 2 . input sup p ly cu rrent fo r the MIC4830 is typi cally 45 a redu cin g to 1 0na i n shutd o wn. t he hi gh volt age el d r iver h a s two internal o s cill ators to control the swit chi ng mosfet and the h-bridg e d r ive r . both of the intern al oscillators? frequenci es can be individually prog ram m ed through th e external resi sto r s to maximize th e efficien cy an d the bri ghtn e ss of the el lamp. regula t ion referrin g to figure 1, initially powe r i s appli ed to v dd . the inte rnal fe edb ack voltag e i s l e ss tha n the referen c e volt age cau s in g the internal co mparator to go low which enable s the swit chin g mosfet?s oscillator. when the swit ching mosf et turns on, curre n t flows throug h the i ndu ctor and flows into the swit ch. the switchi ng mosfet will typically turn on for 90% of the swit chin g p e riod. duri ng the on-time, energy is sto r ed in the i n d u ctor. wh en t he swit ching mosfet turns off, c u rrent fl ow ing into the induc t or force s the v o ltage a c ro ss the indu ct or to reve rse polarity. the voltage acro ss the ind u cto r ri se s until the extern al diode co ndu cts an d cl amp s the volta g e at v out + v d1 . the energ y in the indu ctor i s then discha rge d i n to the c out ca pa citor. the inte rn al comp arator continue s to tu rn the switchi ng mosfet on and off until the inte rnal fee dba ck voltage i s above the referen c e vol t age. on ce the intern al feedba ck voltage is ab ove the refere nce voltage, the internal co mparator tu rns off the switching mosfet?s oscill ator. when the el oscillator i s enabl ed, v a and v b sw itch in oppo site states to a c hie v e an 180v pea k-to -pe a k ac output si g nal. the exte rnal resi stor t hat con n e c ts to the rel pin determi ne s the el freque ncy.
micrel mic48 3 0 septembe r 2 007 7 m999 9-09 130 7 (408) 95 5-16 9 0 v in = 3.6v i in = 12ma l = 220h c out = 2.7nf lamp = 2 in 2 r sw = 250k r el = 2.82m va - v b (100v / di v ) vb (50v / d i v ) va (50v / d i v ) t ime (2ms/div ) f i g u re 2. 100hz o u t pu t w a v e fo rm s w i t ching fr equen c y the switching frequ en cy of the conve r ter i s controlled via an external resi sto r between r sw pin and v dd pin of the device . the switchi ng freq uen cy increa se s a s the re sisto r value de crea se s. for resi sto r val ue sele ctio ns, see t he ?typical cha r a c teri stics: switchin g freq uen cy vs. sw re sisto r? o r use th e equ a t ion belo w . t he switchi ng freque ncy ra nge i s 65 khz to 250 khz, with an accuracy of 20%. in general, the lowe r the swit chin g fre quen cy, the greate r the in put current is dra w n to d e liver more powe r to the output. ho wever, the swit ching f r e quen cy sh oul d not be so low as to allo w the voltage at the switch nod e o r th e cs pin to g o beyond the a b sol u te maxi mum voltag e of those pin s . () ? = m r 36 (khz) f sw sw el frequen c y the el lamp freque ncy is contr o lled vi a an extern al resi st o r con n e ct ed bet wee n r el pin and v dd pin of the device. the lamp fr eque ncy in cr eases a s th e resi st o r v a l ue de cr ea s e s. fo r re sist o r v a lue sele ction s , see the ?typ ic al char act e risti cs: el freq uen cy vs. el re si stor ? g r ap h o n p age 4 o r u s e the equ ation belo w . the e l lamp fr equ ency r ang e is 60hz to 1000h z , w i th an ac curac y of 2 0%. () () ? m r 360 hz f el el v in = 3.6v i in = 19ma l = 220h c out = 2.7nf lamp = 2 in 2 r sw = 290k r el = 1.69m va - v b (100v / di v ) vb (50v / d i v ) va (50v / d i v ) t ime (2ms/div ) f i g u re 3. 200hz o u t pu t w a v e fo rm in gene ral, a s the el lam p freq uen cy i n cr ea se s, the amount of current drawn from the battery will incr ea se. t h e col o r of the el lamp an d the inten s ity are de pen de nt upon its fre quen cy. v in = 3.6v i in = 25ma l = 220h c out = 2.7nf lamp = 2 in 2 r sw = 352k r el = 1.1m va - v b (100v / d iv ) vb (50v / d iv ) va (50v / d iv ) t ime (2ms/div ) f i g u re 4. 300hz o u t pu t w a v e fo rm enable func tion the mi c48 3 0 is di sabl ed b y conne cting the external resi st o r (r sw ) t o gn d. this turns off the sw itc h oscillator of the boost co nverter. connecting the external re si stor ( r sw) to v dd enable s the o scill ator and tur n s o n the device. t he ena ble vol t age sh ould rise o r fall mo notoni cally wi thout interr up tion.
micrel MIC4830 september 2007 8 m9999-091307 (408) 955-1690 application information inductor a 220h murata (lqh4c221k04) inductor is recommended for most applications. generally, inductors with smaller values can handle more current. lowering the inductance allows the boost regulator to draw more input current to deliver more energy every cycle. as a result, a lower value inductor may be used to drive larger panels or make the current panel brighter. however, caution is required as using a low value inductor with a low switching frequency may result in voltages exceeding the absolute maximum rating of the switch node and/or the cs pin. if the application uses a low input voltage (1.8 to 3v), a lower value inductor, such as 100h, may be used in order to drive the el lamp at max brightness without issue. diode an ideal diode to use would be the 1n4148 or equivalent. it has a forward current of 150ma and a typical forward voltage of 950mv. for applications that are not cost driven, a fast switching diode with lower forward voltage and higher reverse voltage can be used to enhance the efficiency, such as bav20ws or bas20w. output capacitor low esr capacitors should be used at the regulated boost output (cs pin) of the MIC4830 to minimize the switching output ripple voltage. the larger the output capacitance, the lowe r the output ripple at the cs pin. the reduced out put ripple at the cs pin along with a low esr capacitor improves the efficiency of the MIC4830 circuit. selection of the capacitor value will depend upon the peak inductor current, inductor size, and the load. the MIC4830 is designed for use with an output capacitance as low as 2.2nf. for minimum a udible noise, the use of a c0g/npo dielectric output capacitor is recommended. tdk and avx offer c0g/npo dielectric capacitors in capacitances up to 2.7nf at 200v to 250v rating in 0805 size. if output ripple is a concern a 0.01f/200v x7r output capacitor is recommended. el lamp terminals (va, vb) an el lamp is connected fr om va to vb as the load. the high voltage alternated across va and vb by the h-bridge cycles generate luminance. the voltage at va and vb should not exceed the voltage at v cs by more than 3v. this situation may become present when noisy enable signals such as those often generated by mechanical switches are applied to the driver?s inputs. to prevent over voltage at va and vb, 10k ? resistors may be placed in series from va to the el panel and from vb to the el panel. an alternative to the use of 10k ? resistors is to apply a diode from the cs pin to va and vb, where the cathode of the diode is on the cs side and the anode is on the va and vb side, respectively.
micrel mic48 3 0 septembe r 2 007 9 m999 9-09 130 7 (408) 95 5-16 9 0 applicati on circuit f i g u re 5: t y p i cal l i -ion po w ered mic48 30 circu it lamp frequ e nc y (h z) 1 0 0 2 0 0 300 4 0 0 5 0 0 6 0 0 7 0 0 8 0 0 9 0 0 size (inch 2 ) capa ci tan c e (nf) r el (m ? ) 2.82 1.69 1 . 1 0 . 8 3 7 0. 6 6 5 0 . 5 6 2 0.471 0.409 0.369 r sw (k ? ) 2 2 5 2 3 2 237 2 4 8 2 5 7 2 6 9 2 8 1 3 0 0 3 2 1 0 . 4 2 f sw (k h z ) 1 6 0 1 5 5 152 1 4 5 1 4 0 1 3 4 1 2 8 1 2 0 1 1 2 r sw (k ? ) 2 3 2 2 5 0 277 3 0 0 3 4 6 3 9 5 4 7 3 1 5 f sw (k h z ) 1 5 5 1 4 4 130 1 2 0 1 0 4 9 1 7 6 r sw (k ? ) 2 5 0 2 9 0 352 4 3 3 5 2 1 2 1 0 f sw (k h z ) 1 4 4 1 2 4 102 8 3 6 9 r sw (k ? ) 2 7 2 3 6 3 480 3 1 5 f sw (k h z ) 1 3 2 9 9 7 5 r sw (k ? ) 3 5 3 4 7 3 4 2 0 f sw (k h z ) 1 0 2 7 6 no te: t a b l e 1 ap p lies to circu it sh o w n in fig u re 5. ta ble 1 : re c o mme nde d r sw & r el v a lu es fo r v a rio u s p a n e l sizes
micrel mic48 3 0 lay out r e c o mm e n dation top bottom septembe r 2 007 10 m999 9-09 130 7 (408) 95 5-16 9 0
micrel mic48 3 0 package inform ation 8-pin msop ( mm) 8 - pin 3 mm x 3mm mlf (ml) 9-09 130 7 5-16 9 0 septembe r 2 007 11 m999 (408) 95 micrel, inc. 2180 fortune drive san jose, ca 9513 1 usa t e l + 1 (408) 9 44-0 800 f a x + 1 (408) 47 4-1 000 w eb http:/ w w w . m i crel.co m the information f u rnished b y micrel in this data sh eet is belie ved to be accurate and reliable. ho w e ver, no responsibility is a ssumed by micr el for its use. micrel reserves the right to change circuitry a nd specifications at an y time w i tho u t notification to the customer. micrel products are not designed or autho ri zed for use as components in life support app liances, devices or sy stems where malfu nction of a product r e a s o n a b l y b e expected to res u lt in personal injury . life suppo rt devices or sy ste m s are devices or s y stems that (a ) are in tende d f o r s u r g i c a l i m p l a into the bod y or (b) support o r sustain life, and w h o s e failure to perf o rm can be re asonabl y e x pected to result in a significan t injury to th e user. a purchaser?s use or sale of micrel produc ts for use in life support app liances, devices or s y stems is a purchaser?s ow n risk and purchaser agre e s to full y indemnif y micrel for an y damages resulting from such use or sale. c a n n t ? 2007 micrel, in corporated.
micrel mic48 3 0 revision history da te rev i sion edits b y : des c ription of ch ange 1 . 0 i n i t i a l s p e c 6/15/06 1.1 m. mclean cove rsi on to micr el for m at septembe r 2 007 12 m999 9-09 130 7 (408) 95 5-16 9 0

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