r1285l series pwm step-up/inverting dc/d c converter for amoled no.ek-208-091101 step-up/inverting dc/dc converter the r1285l series are dual output cmos-based pwm step-up/inverting dc/dc converters. r1285l includes a soft start circuit, an under-voltage lockout circuit (uvlo) and a latch type protection circuit. by simply using inductors, capacitors, and (resistors ) as external components, a high-efficiency step-up/inverting dc/dc converter can be easily configured. the inverting dc/dc converte r can be started after step-up dc/dc converter by sequence control. at the standby mode, the internal shutdown switch can separat e the output from the input. features ? supply current (i dd1 ) typ. 4ma (v in =4.8v, in switching) ? supply current (i dd2 ) typ. 350 a (v in =4.8v, in non-switching) ? standby current (i standby ) max. 3 a (v in =4.8v, ce="l") ? input voltage range (v in ) 2.3v to 4.8v ? step-up output voltage range (v outp ) select from 4.6v, 4.8v or 5.0v ? inverting output voltage range (v outn ) -2.0v to -6.0 v (a version) the output voltage adjustable up to -6v with an external resistor . (feed back voltage 0v) (b version) ? step-up output voltage accuracy 1.5% ? inverting output voltage accuracy 1.5% (a version) 25mv (b version) ? output reference voltage ( v ref ) 1.2v ( 28mv) ? oscillator frequency (f osc ) 1.4mhz ? oscillator maximum duty cycle (maxduty) step-up :typ. 85% inverting :typ. 90% ? uvlo detect voltage (v uvlo ) typ. 2.05v ? soft start time (t start ) typ. 4.5ms ? latch protection circuit de lay time for protection typ. 50ms ? auto-discharge function ? package dfn2730-12 block diagrams r1285lxxxa r1285l00xb (fixed inverting output voltage type) (adjustable inverting output voltage type) v outn pgnd l xp1 pv cc gnd test1 test2 ce l xn l xp2 v outp v cc vref1 current limit pwm control maxduty discharge control vref3 osc pwm control current limit maxduty discharge control soft start1 vref2 sequence control enable control uvlo soft start2 timer short protect v outn pgnd l xp1 pv cc gnd v fbn v ref ce l xn l xp2 v outp v cc vref1 current limit pwm control maxduty discharge control vref3 osc pwm control current limit maxduty discharge control soft start1 vref2 sequence control enable control uvlo short protect soft start2 timer selection guide typical applications package quantity per reel part no. dfn2730-12 5,000 pcs r1285l . xx$ .. ? -tr-f r1285lxxxa (fixed inverting output voltage type) pgnd pv cc gnd test1 l xn l xp2 v outp l xp1 v cc v outn ce test2 c1 4.7 f ce control c2 10 f d2 l2 l1 c3 10 f d1 v outn v outp r1285l00xb (adjustable inverting output voltage type) pgnd pv cc gnd v fbn l xn l xp2 v outp l xp1 v cc v out n ce v ref c1 4.7 f ce control c2 10 f d2 l2 l1 d1 v outn v outp r3 r2 r1 c4 c5 c3 10 f . xx . : specify the inverting output voltage within the range -2.0v ( . 20 . ) to -6.0v ( . 60 . ) in 0.1v steps. for the adjustable inverting output voltage type, . 00 . . (b version) . $ . : select the step-up output voltage from ( . 1 . ) 4.6v, ( . 2 . ) 4.8v or ( . 3 . ) 5.0v. . ? . : select from ( . a . ) fixed inverting output voltage type or ( . b . ) adjustable inverting output voltage type l1,l2: vlf3010-4r7 (tdk) sd: crs02 (toshiba) l1,l2 : vlf3010-4r7 (tdk) sd : crs02 (toshiba) r1, r2: resistors for setting v outn r3: 2k , c4: 47pf, c5: 0.1 f package typical characteristic dfn2730-12 bottom view 7 12 11 10 9 8 6 1 2 3 4 5 12 7 8 9 10 11 1 6 5 4 3 2 top view ? 1 pgnd 2 v outp 3 pv cc 4 v cc 5 gnd 6 ce 7 test2 ? 2 or v ref 8 test1 ? 2 or v fbn 9 v outn 10 l xn 11 l xp1 12 l xp2 r1285lxx1a/001b efficiency vs. output current ? ) the tab is substrate level (gnd). ? 2) the test1 pin and test2 pin connected to the gnd level or should be open. applications ? power source for active matrix oled ? power source for battery-powered equipment 0 20 40 60 80 100 120 140 160 180 200 output current i out (ma) efficiency (%) 20 100 60 40 80 90 70 50 30 v outp =4.6v v out =-4.9v, topt=25 c v in =4.5v v in =3.7v v in =2.9v
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- 5 % & m f d u s p o j d % f w j d f t $ p n q b o z ricoh presented with the japan management quality award for 1999 . ricoh continually strives to promote customer satisfaction, and shares the achievements of its management quality improvement program with people and society. ricoh awarded iso 14001 certification. the ricoh group was awarded iso 14001 certification, which is an international standard for environmental management systems, at both its domestic and overseas production facilities. our current aim is to obtain iso 14001 certification for all of our business offices. ricoh completed the organization of the lead-free production for all of our products. after apr. 1, 2006, we will ship out the lead free products only. thus, all products that will be shipped from now on comply with rohs directive.
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