preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 1 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 multi - channel dc - dc converter general description the LP6284 includes a high - performance boost regulator, a low dropout linear regulator (ldo), a gate pulse modulator (gpm), a voltage detector, a vcom buffer (unity - gain opa), and a vgh charge pump controller for active matrix tft lcd s. the converter is a high switching frequency (640khz or 1.2mhz) current - mode regulator with an integrated 16v n - cha nnel 0.2? mosfet that allows the use of ultra - small inductors and ceramic capacitors. it provides fast transient response to pulsed loading while achieving efficiency over 90%. the low - dropout (ldo) linear regulator can supply up to 350ma current while in put voltage is 3.3v. it is s uitable for the supply voltage of the timing controller. the unity - gain buffer can drive the lcd vcom voltage that features high short - circuit current, fast slew rat e and rail - to - rail inputs and outputs. the vgh charge pump cont roller provides regulated tft gate - on voltage. the regulation of the positive charge p ump is generated by the internal comparator that senses the output voltage and compares it with an internal reference. other features include thermal shutdown protection and under - voltage lockout (uvlo) . the LP6284 is available in a space saving qfn - 2 4 (0. 5 mm pitch) package . order information lp 6284 f: pb - free package type qvf : qfn - 24 features ? wide v in range: 2.5v to 5.5v ? 640khz/1.2mhz current - mode boost regulator ? fast transient response to pulsed load ? adjustable output voltage ( 1%) ? built - in 16v, 2a, 0.2 n - mosfet ? high efficiency up to 90% ? programmable soft - start ? low dropout voltage linear regulator ? maximum output current : 350ma ? adjustable output voltage : 1.5v to vin ? 0.5v( 1.5%) ? gpm controller with adjustable ? power - on sequence control ? power - on delay and falling time ? flicker compensator ? low voltage detec tor ? programmable detecting voltage ( 2%) ? programmable delay time ? unity - gain operation amplifier for vcom buffer ? charge pump for vgh regulation ? under - voltage protection ? over - temperature protection ? available in qfn - 2 4 ( 4 4 mm ) ? rohs compliant and halogen free ? pb - free package applications ? tft lcd tv ? tft lcd monitor marking information device marking package shipping lp 6284 lps lp628 4 ywx qfn - 24 3 k/reel y: y is year code. w: w is week code. x: x is series number.
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 2 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 typical application circuit fsel rst avdd ldoi opi comp opo fb vin lx ss ldofb ldoo vghm vgh fbp drvp pgnd agnd drn vin avdd vgh fsel reset opi vcom vdet hvdp dly vflk vflk figure 1 . typical application circuit of LP6284 pin configuration lx vin ss agnd ldof avdd drvp fbp vgh vghm 1 2 3 agnd ldoo ldoi vdet rst dly hvdp vflk drn pgnd fsel fb comp opi opo 4 5 6 7 8 9 1 0 11 12 1 3 1 4 1 5 1 6 1 8 1 7 1 9 20 2 1 22 23 24 figure 2 . qfn - 24 package (4mm x 4mm) top view
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 3 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 function block diagram lx boost ss pgnd fb osc fsel comp vin ldo ldoi control logic voltage detector opi switch control block drn vghm vgh hvdp vflk positive charge pump vdet fbp drvp otp avdd ldoo ldof dly opo agnd rst figure 3. function block diagram
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 4 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 function al pin description pin n o . pin name description 1 lx bo o s t r eg ul a t o r sw i t c h i n g n o d e . c o nn e c t t he ind u c t or a n d t h e s c ho t tk y d iod e t o l x. 2 vin supply input. t h e i n put v o l t a g e r an g e i s b e t w e e n 2.5 v to 5.5 v . c o nn e ct a ce r a m i c c ap a c i t o r b e t w e en vin a n d g nd . 3 ss s o f t - s t ar t c o n t r o l p i n . c o nn e ct a so f t - s t a r t c a p ac i t or t o t h i s pi n . 4 agnd analog gnd. 5 ldof l i n e ar r e gu l a t or f e e db a ck i np u t . connect to an external resistive voltage divider from the ldo o to gnd to set the output voltage. 6 ldoo li n e ar r e g u l at o r o ut pu t . b y p ass ldo o t o g n d w i t h a ca p ac it or. 7 ldoi li ne ar r e gu l a t or power source . b y pass ldo i t o g n d a c a pac i t o r. 8 vdet v o lt age d e t e c t or i np u t . connect to an external resistive voltage divider from the v i n to a g n d . 9 ??? ? ? ? ? ? ? voltage detector output for reset. active low 10 dly reset delay time. c o n n ect a c a pac i t o r be t w ee n d ly a n d g n d . 11 hvdp high - voltage switch delay input. connect a capacitor from hvdp to gnd to set the delay time. 12 vflk vflk is produced by tim ing controller for charging or discharging vghm. 13 drn g p m d i sc h a r g e p i n. 14 vghm g p m o ut pu t . 15 vgh g p m i npu t . 16 fbp v g h c h a r g e - p u m p r e g u l a t o r f e e d b ack i n p u t . connect to an external resistive voltage divider from the vgh to gnd to set the output vol tage. 17 drvp v g h c h a r ge - p u m p r e gu l a t o r d r i v e r o ut pu t . 18 avdd vdd for source driver power. this also supplies the gpm/opa/step - up controller block. 19 opo unity - gain operation amplifier output pin. 20 opi unity - gain operation amplifier input pin. 21 comp b oost r eg u l a t o r e r r o r a m pl i f i e r c om p e ns a t i on p i n. 22 fb b oost r eg u l a t o r fe e d b a c k i n p u t . connect to an external resistive voltage divider from the output to fb to set the output voltage. 23 f sel f r eq u e ncy s e l ect p i n. set f s e l t o high for 1.2m h z o p e r a t i o n . set t h i s p i n t o low f or 64 0 k h z o p e r a t i o n. 24 pgnd po w e r g r ou n d .
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 5 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 absolute maximum ratings note 1 ? v in , ldoi ------------------------------ ----------- --- ----------- --- ---- ------------------------- -------- -------- -- - 0.3v to +6.5v ? lx - ---- -------- ------------------------------- --- ----------- --- ----------- ------------------ ---- -- - -- ----- ------------ - 0.3v to + 16 v ? ldoo -------------------------------------- --- ----------- --- ------------------------------------------------------- ? 0.3v to (v ldoi + 0 .3v) ? vghm, vgh, drn ------------------------------------- --- ---------- ----------------------------------- -------- ? 0.3v to 30v ? avdd ---------------------------------------------- --- --------- --------------------------------------- ----- -- ----- ? 0.3v to 16 ? opo, op i , drvp ----------------------------------------------------------------------- ----------- -- ----- ------ ? 0.3v to (v avdd + 0.3v) ? vdpm, vflk, dly, ??? ? ? ? ? ? ? , vdet, ss, comp, fb, fbp ---------- --- ------ -- -------- ---- ------ ------ ? 0.3v to (v in + 0.3v) ? operating junction temperature range (t j ) ------- ----------------------------------------------- ---- - 40 to 150 ? operation ambient temperature range ------- --------------------------------------------------------- - 40c to +85c ? storage temperatu re range -- ---------------------------------------------------------------------------- - 65c to +150c ? maximum soldering temperature (at leads, 10sec) ------------------------------------------ ------- +260c ? maximum junction temperature ---------------- --------------------- ------------------------------------ 150c note 1. stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal information ? thermal r e sist a nce q f n - 24 4 x 4 , j a -------------------------------------------------------------------------------- --- ----------- 56 c/w esd susceptibility ? hbm(human body mode) note 2 ---------------------------------------------------------------------- 2kv ? mm(machine mode) note 3 - ----------------------------------------------------------------------------- 200v note 2. the human body model (hbm) is a 100pf capacitor discharged through a 1.5k resistor into each pin. the testing is done according jedec. note 3. machine model (mm) is a 200pf capacitor discharged through a 500nh inductor with no series resistor into each pin. the testing is done according jedec .
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 6 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 electrical characteristics ( v in =3. 3 v, v avdd = 10 v, t a =25c, unless otherwise specified) parameter symbol test conditions min t yp max units general v in input supply voltage v in 2.5 5.5 v v in supply current i q vfb= 1.3v, lx no switching 0.5 1 ma vfb=1.1v, lx switching 2 4 ma shutdown current i sd 1 5 ua input uvlo threshold v uvlo(v th ) v in r i s i ng 1.8 2 2. 2 v u vlo threshold hysteresis v uvlo(hys) f al l i ng h ys t e r es is 100 mv frequency selection levels f osc fsel=low 1.5 v fsel=high 0.6 v fsel pull down current i fsel v fsel =1v 4 ua thermal shutdown threshold t sd 160 c thermal shutdown hysteresis 30 c boost regulator s w i t c hi n g f r e que n c y f sw f s e l = g n d -- 640 -- khz f s e l = v i n 1000 1200 1500 m a x i m u m d u t y - c yc l e d max 86 90 94 % feedback voltage v fb 1.228 1.24 1.252 v line regulation v in =2.5v to 5.5v - 0.1 %/v switch - on resistance r ds(on ) 200 500 m ? current limit i limit 2 a soft start current i ss 4 ua fb fault protection voltage v uvp v fb falling 1.05 v fb fault delay t uvp 160 ms voltage detector minimum operating voltage v dv 1.6 v detecting voltage adjustment v det 1.08 1.1 1.12 v ??? ? ? ? ? ? ? pull low resistanc e r rst v rst =0.2v, i rst =1.2ma 1.7 k ? dly source current i dly v dly =1v 5 10 15 ua dly threshold voltage v dly 1.2 1.24 1.28 v
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 7 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 electrical characteristics (continued) ( v in =3. 3 v, v avdd = 10 v, t a =25c, unless oth erwise specified ) parameter symbol test conditions min typ max units low dropout linear regulator ldo supply voltage v ldo 2.5 5.5 v ldo supply curren t i q_ldo 90 ua dropout voltage v drop v in = 3.3v, i out = 3 5 0ma 450 500 mv ldo feedback voltage v ldof 1.224 1.24 1.256 v current limit i limit 350 400 ma line regulation v in =2.5v to 5.5v, i out =0.1a, v ldo =2.5v 0.1 0.3 %/v load regulation i out =1ma to 300ma 0.2 0.5 % gate pulse modulator vflk input high voltage v h_flk 1.5 v vflk input high v oltage v l _flk 0.8 v hvdp charge current i hvdp 20 ua vgh switch on resistance r ds _gh 20 ? drn switch on resistor r ds_ drn 25 ? positive charge pump feedback voltage v fbp no load 1.216 1.24 1.264 v fbp input bias current i b v fbp =1.5v - 50 + 50 na drvp switch on resistance r ds _p 20 ? r ds _n 20 ? switch frequency f sw_drvp f osc /2 hz c ontinuous output current i drvp 20 ma unity - gain operation amplifier opa supply current i op 0.5 0.9 ma input offset voltage v os v opo =v avdd /2 - 17 +17 mv opi input bias current i op _ b 1 50 na o ut pu t v o l t a ge s w i n g h i gh v oh i load = 75 m a v avdd - 1.5 v o ut pu t v o l t a ge s w i n g low v o l i load = - 75 m a 1.5 short circuit current v op_short v opi = v avdd /2 180 ma - 3db bandwidth f3db 12 mhz gain ban dwidth gbw 8 mhz slew rate sr 12 v/us
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 8 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 power on sequence vin vldo vavdd vgh vdpm vflk t dly vghm figure 4. power sequence and gpm function
preliminary datasheet LP6284 email : marketing@lowpowersemi.com www.lowpowersemi.com page 9 of 9 lp 628 4 C 00 version 0. 0 aug . - 20 16 outline information qfn - 24 package ( 4 4 ) pitch 0. 5 (unit: mm) lps lp 628 4 ywx d e a 1 a a 3 1 e 2 d 2 symbols unit dimension in millimeter min max a 0.800 1.000 a1 0.000 0.050 a3 0.175 0.250 b 0.180 0.300 d 3.950 4.050 d2 2.300 2.750 e 3.950 4.050 e2 2.300 2.750 l 0.350 0.450 e 0.5
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