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feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation applications ? white led back-lighting ? hand-held devices ? digital cameras ? flip-phones / clam-shell cellular phones ? high-fashion cellular phones figure 2. 4 leds for main panel and 3 leds for sub panel figure . main leds display and oled sub display 23 . 1 1 2 1 ? ? ? ? ? ? ? ? + = sub sub sub r r v fb sw gnd l d v in s p6415 ovp r sub r sub2 fb2 ch2 sel ch 0 h main display oled sub display 0v >.5v v in 2.7v~4.2v c in 4.7 f en c out 4 .7 f v fb r fb iled= 0.2 r fb iled v sub main 47 p f fb sw gnd l d v in sp6415 ovp fb2 ch2 sel ch 0 h main display c out 2 4.7 f v sub r fb2 0v >.5v r fb c out 4.7 f c in 4.7 f v in 2.7v~4.2v en v fb v fb2 iled2 iled= 0.2 r fb iled iled2= .23 r fb2 v sub main dfn-10 (3mmx3mmx0.85mm) top view 8 7 2 3 4 s p6415 5 6 0 sp6415 typical application circuit description solved by tm integrated white led driver with organic led display power supply integrated oled and white-led driver wide input voltage range: 2.7v to 5.5v adjustable output voltage up to 20v complete protection: ovp, otp, uvp pwm dimming control small external components cycle-by-cycle current limit lead free, rohs compliant packaging: 0pin dfn ? ? ? ? ? ? ? ? the sp64 5 is a dual boost dc/dc converter, designed to drive up to 4 white leds with a constant cur - rent and to power an organic led display with a constant voltage. according to the sel pin status, the sp6415 either regulates output current fowing through series connected leds or regulates output volt - age applying to the oled. a single external resistor is used to set the maximum led current. the led current can be adjusted by applying a pwm signal to the en pin. pulling the en pin to gnd disables the chip and reduces the supply current to less than ua. additional features include a low-side nfet switch that can turn off the led string with no dc current path to ground. other features include ovp, ocp, uvp and otp. the sp64 5 is available in a small (3mmx3mmx0.85mm) dfn-0 package.
2 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation parameter package die attach symbol maximum unit thermal resistance (junction to ambient) ja 48 o c / w internal power dissipation p d 2 w 50 o c 350 o c maximum junction temperature solder iron (0 sec)** dfn-0 (3x3x0.85)(mm) conductive epoxy absolute maximum ratings recommended operating conditions parameter symbol rating unit input supply voltage v in 2.7 to 5.5 v ambient temperature range t a -40 to +85 junction temperature range t j -40 to +25 o c caution: stress above the listed absolute rating may cause permanent damage to the device. * hbm a: 0v ~ v thermal information * mil-std-202g 20f parameter symbol maximum unit input supply voltage v in 6 en, fb voltages v en ,v f b v in sw voltage v sw 30 esd classification v a*
3 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation parameter symbol min typ max units input voltage range v in 2.7 5.5 v t a = 25 o c 50 200 t a = -40 to 85 o c 300 t a = 25 o c 50 250 t a = -40 to 85 o c 400 t a = 25 o c 50 200 t a = -40 to 85 o c 300 t a = 25 o c 50 250 t a = -40 to 85 o c 400 shutdown current i sd 0.05 2 a fb feedback voltage v fb 0.2 0.2 0.23 fb2 feedback voltage v fb2 .2 .23 .26 300 350 400 280 400 main_switch r dson, n 0.6 .6 pmos switch r dson , p 8 0 nmos switch r dson , n2 6 8 switch off time t off 400 ns input under voltage lockout uvp .7 2 2.3 output over voltage protection ovp 2 22 23 over temperature protection otp 60 over temperature hysteresis oth 20 main switch leakage n 0. 2 pmos switch leakage p 0.5 nmos switch leakage n2 0.5 en input threshold (low) (shutdown) 0.4 en input threshold (high) (enable the device) .5 sel low level voltage enable sub display disable main display 0.3 sel high level voltage enable main display disable sub display .5 switch current limit i cl test condition t a = -40 o c to +85 o c sub display quiescent current i q (sub) fb = 0.3 (not switch) fb = 0. (switching) main display quiescent current a en = 0v t a = -40 to 85 o c t a = -40 to 85 o c v ma ? r dson t a = -40 to 85 o c t a = 25 o c t a = -40 to 85 o c t a = -40 to 85 o c v t a = -40 to 85 o c i q (main) fb = .3v (not switch) a fb = .5v (switching) a o c t a = -40 to 85 o c i sw v en threshold t a = -40 to 85 o c sel threshold v v sw = 5v electrical specifications v in =3.6v, en = v in, t a = 25 o c unless otherwise noted.
4 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation functional block diagram figure 3. s p645 function al block diagram l main display r fb fb gnd enable current sensing sw cl comp - uvp comp logic n ch n2 ref ref2 driver driver ch2 fb2 ovp comp ovp ref v in c in cp 7 6 400ns one shut cl adjust v in select logic en 2 sel 3 organic led c ovp d p xenable vref uvp ref otp 5 4 8 0
5 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation pin number pin name pin description v in input voltage. 2 en shutdown control input, active low. the shutdown pin is an active low control. tie this pin above .5v to enable the device. tie this pin below 0.4v to turn off the device. 3 sel selection pin. internal mosfet selection. pull low to turn on the internal ch. pull high to turn on ch2. 4 fb main display feedback. 5 ch main display return voltage 6 gnd ground. 7 fb2 sub display feedback. 8 ch2 sub display power supply voltage. ovp over voltage protection. 0 sw this is the switch pin and is connected to the drain of the internal nmos power switch n. 23 . 1 1 2 1 ? ? ? ? ? ? ? ? + = sub sub sub r r v * die attach: conductive epoxy dfn-10 (3mmx3mmx0.85mm) top view pin configuration pin description note : the area enclosed by dashed line represents exposed pad and connect s to gnd. 8 7 2 3 4 s p6415 5 6 0 _ ^
6 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation the s p645 is designed for white led & oled back- lighting in mobile phone applications. it has a main display loop which can drive up to 4 white leds in series and a sub display loop which is designed to drive oled up to 20v/0ma or 3 white leds. the s p645 operates at a wide input voltage range suitable for li-ion battery and has a constant off time for smaller inductor and capacitors. the block diagram refers the operation circuit. by sel pin, it can choose the different channel to turn on ch or ch2. current limit protection the s p645 has current limiting protection to prevent excessive stress on itself and external components dur - ing overload conditions. the internal current limit com - parator will disable the nmos power device at a typical switch peak current limit of 300ma. the output capacitor needs to be a minimum of uf with 25v rating. for applications with 5v input, an output capacitor of 2.2uf or 4.7uf may be needed to lower output ripple and improve regulation. for better voltage filtering, ceramic capacitors with low esr are recommended. x5r and x7r types are suitable be - cause of their wider voltage and temperature ranges. output over-voltage protection the s p645 contains dedicated circuitry for monitoring the output voltage. in the event that the primary led network is disconnected the output will increase and be limited to 22v(typ.). there is a ~v hysteresis associated with this circuitry, which will turn the nmos off when the output voltage is at 23v(max.) until the output voltage reach 2v(typ.) or lower. the 22v limit allows the use of 25v f ceramic output capacitors creating an overall small solution for white led applications. under voltage protection the s p645 has a uvp comparator to turn the nmos power device off in case the input voltage or battery voltage is too low , preventing an on state of the power device con - ducting large amounts of current. there is a ~v hysteresis associated with this circuitry, which will turn the nmos off when the output voltage is at 23v(max.) until the output voltage reaches 2v(typ.) or lower. the 22v limit allows the use of 25v mf ceramic output capacitors creating an overall small solution for white led applications. capacitor selection a 4.7 f inpu t capacitor can reduce input ripple. for better voltage stability, to increase the input capacitor value or using an lc filter is feasible, especially in li- i on battery application s . the input capacitor acts as a bypass to the ic and needs to be connected directly to the vin pin and the gnd pin for proper low ripple reg - ulation. diode selection a schottky diode is a good choice for s p645 because of its lower forward voltage drop and faster reverse recovery. using s chottky diode s can help ob - ta i n better efficiency. h igh speed rectification is also a good characteristic of s chottky diode s for high switch - ing frequency. current rating of the diode must meet the root mean square of the peak current and output average current multiplication. inductor selection the recommended value of inductor for s p645 ap - plications is 0uh. small size and better efficiency are the major concerns for portable device, such as s p645 used for dual panel mobile phone. the inductor should have low dcr for better efficiency. to avoid inductor saturation, current rating should be at least 600ma. the input range is 2.7v to 5.5v. detailed description application information
7 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation feedback voltage vs. v in (4leds) main display efficiency ( 4leds ) feedback voltage vs. v in (3leds) main display efficiency ( 4leds ) feedback voltage vs. v in (3leds) 0. 0.3 0.5 0.7 0. 0.2 0.23 0.25 2.7 3 3.3 3.6 3. 4.2 4.5 4.8 5. v in (v) v f b ( v ) 5.5 ma 0ma 20ma 0.7 0. 0.2 0.23 0.25 0.27 2.7 3 3.3 3.6 3. 4.2 4.5 4.8 5. 5.5 v in ( v ) v f b ( v ) ma 0ma 30ma 20ma c out = 4.7 f 60 65 70 75 80 85 0 4 7 0 3 6 load current ( ma ) v in =3v v in =3.6v v in =4.2v inductor=0 h 60 65 70 75 80 85 0 4 7 0 3 6 load current ( ma ) e f f i c i e n cy ( % ) v in =4.2v v in =3v v in =3.6v inductor=22 h 0.7 0. 0.2 0.23 0.25 0.27 2.7 3 3.3 3.6 3. 4.2 4.5 4.8 5. 5.5 v in ( v ) v f b ( v ) 20ma 30ma 0ma ma c out = f en threshold vs. v in 0.4 0.5 0.6 0.7 0.8 0. .0 . .2 .3 .4 .5 2.5 3 3.5 4 4.5 5 5.5 e n th r e s ho l d ( v ) v in (v) t a =85 o c t a =-40 o c t a =25 o c t ypical performance characteristics
8 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation main display efficiency ( 3leds ) sub display efficiency( v sub =20v ) sub display efficiency (v sub =12v) sub display efficiency( v sub =20v) 60 65 70 75 80 85 0 4 7 0 3 6 load current (ma) e f f i c i e n cy ( % ) inductor=22 h v in =3v v in =4.2v v in =3.6v 50 55 60 65 70 75 80 85 4 7 0 3 6 load current (ma ) e f f i c i e n c y ( % ) inductor=0 h v in =3.3v v in =3.6v v in =4.2v v in =2.5v 50 55 60 65 70 75 80 85 0 4 7 0 3 6 load current (ma) e f f i c i e n c y ( % ) inductor=22 h v in =2.5v v in =4.2v v in =3.6v v in =3.3v v in =5.0v 50 55 60 65 70 75 80 85 4 7 0 3 6 load current (ma ) e f f i c i e n c y ( % ) v in =4.2v v in =2.5v v in =3.3v v in =3.6v inductor=0 h sub display efficiency( v sub =12v) 60 65 70 75 80 85 0 4 7 0 3 6 load current (ma ) e f f i c i e n c y ( % ) inductor=22 h v in =5.0v v in =4.2v v in =3.3v v in =3.6v v in =2.5v main display efficiency ( 3leds ) 60 65 70 75 80 85 4 7 0 3 6 load current ( ma ) e f f i c i e n cy ( % ) v in =3.6v v in =4.2v v in =3v inductor=0 h t ypical performance characteristics
feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation sub enable current vs. v in (part not switching) main disable current vs. v in (part switching) switch r dson vs. v in sub disable current vs. v in (part not switching) input under voltage lockout vs. temp. 0 50 00 50 200 250 300 2.5 3 3.5 4 4.5 5 5.5 v in (v) e n a b l e c u r r e n t ( a ) t a =85 o c t a =-40 o c t a =25 o c 0 50 00 50 200 250 300 2.5 3 3.5 4 4.5 5 5.5 v in ( v ) d i sa b l e c u r r e n t ( a ) t a =85 o c t a =-40 o c t a =25 o c 0 50 00 50 200 250 300 2.5 3 3.5 4 4.5 5 5.5 v in (v) d i sa b l e c u r r e n t ( a ) t a =85 o c t a =-40 o c t a =25 o c 0.5 0.6 0.7 0.8 0. .0 . .2 .3 .4 .5 .6 2.5 3 3.5 4 4.5 5 5.5 v in (v) r d s o n ( ? ) t a =-40 o c t a =25 o c t a =85 o c .7 .8 . 2.0 2. 2.2 2.3 -40 -20 0 20 40 60 80 00 temperature ( o c) tu r n o n / tu r n o f f ( v ) main display 4leds i led =20ma v out =2v t on t off main enable current vs. v in (part switching) 0 50 00 50 200 250 300 2.5 3 3.5 4 4.5 5 5.5 v in (v) e n a b l e c u r r e n t ( a ) t a =85 o c t a =-40 o c t a =25 o c t ypical performance characteristics
0 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation typical switching waveform 3 2 v out =2v, v in =2.5v; 4leds i out =0ma (r fb =20 ? ) ) v sw = 20v/div,dc 2) v out , 00mv / div,ac 3) inductor current, 200ma / div,dc t= 0 s / div inductor=0 h, c out =4.7 f 3 2 typical switching waveform v out =2v, v in =3.6v; 4leds i out =20ma (r fb =0 ? ) ) v sw = 0v/div,dc 2) v out , 00mv / div,ac 3) inductor current, 200ma / div,dc t= 0 s / div inductor=0 h, c out =4.7 f step response v out = 2v , v in =3.6v ) load 2ma to 5ma to 2ma ,dc. 2) v out , 00ma / div,ac 3) inductor current 200ma / div,dc t= 20 s /div 3 2 v out =2v , v in =2.7v ) en , v/ div.dc 2) v out , 0/div,dc 3) inductor current 00ma/div,dc load = 4leds, t=2ms/div start-up/shutdown 3 2 t ypical performance characteristics output over voltage protection vs. temp. fb trip point vs temperature sub display 2.0 2.2 2.4 2.6 2.8 22.0 22.2 22.4 22.6 22.8 23.0 -40 -20 0 20 40 60 80 temperature ( o c) o u t pu t o v e r v o l t a g e ( v ) 85 v in =3.6v . .20 .2 .22 .23 .24 .25 -40 -20 0 20 40 60 80 temperature ( o c) f e e db a c k t r i p p o i n t ( v ) 85 v in =3.6v v in =4.2v
feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation typical switching waveform 3 2 v out =2v, v in =2.5v; 4leds i out =0ma (r fb =20 ? ) ) v sw = 20v/div,dc 2) v out , 00mv / div,ac 3) inductor current, 200ma / div,dc t= 0 s / div inductor=0 h, c out =4.7 f 3 2 typical switching waveform v out =2v, v in =3.6v; 4leds i out =20ma (r fb =0 ? ) ) v sw = 0v/div,dc 2) v out , 00mv / div,ac 3) inductor current, 200ma / div,dc t= 0 s / div inductor=0 h, c out =4.7 f step response v out = 2v , v in =3.6v ) load 2ma to 5ma to 2ma ,dc. 2) v out , 00ma / div,ac 3) inductor current 200ma / div,dc t= 20 s /div 3 2 v out =2v , v in =2.7v ) en , v/ div.dc 2) v out , 0/div,dc 3) inductor current 00ma/div,dc load = 4leds, t=2ms/div start-up/shutdown 3 2 p ackage: 10 pin dfn package dimension dfn-10 (3mmx3mmx0.85mm) d e t o p v i e w l d 2 e 2 e b o t t o m v i e w p i n 1 i d b h a s i d e v i e w g f min max min max a 0.00 0.035 d 2.00 3.00 0.4 0.22 e 2.00 3.00 0.4 0.22 f e 0.450 0.550 0.08 0.022 d2 e2 b 0.50 0.250 0.005 0.00 l 0.350 0.450 0.04 0.08 g 0.00 0.00 0.0004 0.004 h 0.000 0.050 0.000 0.002 .600 typ. 0.063 typ. 2.400 typ. 0.04 typ. symbols millimeters inches 0.450 typ. 0.07 typ.
2 feb27-07 rev k integrated white led driver with organic led display power supply ? 2007 sipex corporation main display efficiency ( 3leds ) sub display efficiency( v sub =20v ) sub display efficiency (v sub =12v) sub display efficiency( v sub =20v) 60 65 70 75 80 85 0 4 7 0 3 6 load current (ma) e f f i c i e n cy ( % ) inductor=22 h v in =3v v in =4.2v v in =3.6v 50 55 60 65 70 75 80 85 4 7 0 3 6 load current (ma ) e f f i c i e n c y ( % ) inductor=0 h v in =3.3v v in =3.6v v in =4.2v v in =2.5v 50 55 60 65 70 75 80 85 0 4 7 0 3 6 load current (ma) e f f i c i e n c y ( % ) inductor=22 h v in =2.5v v in =4.2v v in =3.6v v in =3.3v v in =5.0v 50 55 60 65 70 75 80 85 4 7 0 3 6 load current (ma ) e f f i c i e n c y ( % ) v in =4.2v v in =2.5v v in =3.3v v in =3.6v inductor=0 h sub display efficiency( v sub =12v) 60 65 70 75 80 85 0 4 7 0 3 6 load current (ma ) e f f i c i e n c y ( % ) inductor=22 h v in =5.0v v in =4.2v v in =3.3v v in =3.6v v in =2.5v main display efficiency ( 3leds ) 60 65 70 75 80 85 4 7 0 3 6 load current ( ma ) e f f i c i e n cy ( % ) v in =3.6v v in =4.2v v in =3v inductor=0 h sipex corporation headquarters and sales offce 233 south hillview drive milpitas, ca 5035 tel: (408) 34-7500 fax: (408) 35-7600 ordering information sipex corporation reserves the right to make changes to any products described herein. sipex does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others. solved by tm part number voltage operating temperature range package marking* pack quantity sp645er-l/tr adj -40oc to +85oc lead free 0 pin dfn sp64 5erywwx ,000/ tape & reel *note: y = year, ww = product work week, x = st alpha of lot number

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