CP2129 v1.1 product brief dc/dc series step-up dc-dc converter general description sot 2 3-6l -4 0 j 85 the cp2 129 is a step-up dc/dc co n v erter spe c ifically desi gne d for driving white leds with a consta nt cu rre nt. the device can d r ive u p to 4 white leds from a 3v power sup p ly. pwm d i mming co ntrol is sup porte d to adjust the b r ightne ss of the white le ds. the CP2129 swit che s at 1.1 mhz all o win g the use of tiny compone nts. 2 50mv feedba ck voltage minimi zes the p o we r loss in th e cu rre nt se tting resi sto r for better efficien cy. t he CP2129 is equip ped with the over voltage prote c tion wh en the ovp pin con n e c ting to the vout, whi c h can ma ke the device keep i n safe mod e whe n the leds in o pen state. the cp2 129 i s availabl e in sot23 - 6l pa ckage. features y inhere n tly matched le d cu rre nt y high effici en cy: 84% (typical) y stable 20v bi polar swit che s y internal outp u t over-voltage protectio n (1 7v typical) y fast 1.1m hz swit chin g freq uen cy y uses tiny 1m m height indu ctors y shutdown cu rrent: <1 0 a y low p r ofile s o t23 - 6l p a ckag e applications y mobile ph one s y digital still camera y mp3 players y pda y gps receivers pin configurations 4 8 ( / % ' # 7 * / 4 ) % / $ 1 0 7 1 4 0 5 - cp212 9 top view sot23 - 6l copyri ght ?2 006 chipho m e r te chn o log y limited 1
CP2129 v1.1 product brief dc/dc series step-up dc-dc converter ty pical application c i rcuit cp 2129 l1 10 h vin sw r1 cin 1 f shdn gn d cout 1 f vout fb d1 vi n le d1 ov p dimming con t ro l led 4 le d2 led3 CP2129 driving 4 led li - i on battery 12 ? con t ac t w i th chiphomer 4f, building d, 1618 yish an ro ad sha nghai, 20 110 3, p.r.c. tel: (86 ) 21 -6 4014 543 6 4 0 5848 8 fax: (86)21-6 4050 030 sale: sales@chiphomer.com tech nical su pport: suppo rt@chi pho mer.com web site: www.chi phom er. c om shenzhen off i ce: 10d, buildin g 2, dushi yan ggua ng ga rd en ch ego n g m iao, futian distri ct, shen zhe n , 5180 48 , p.r.c. tel: (86 ) 75 5-8 204 6706 8 204 77 89 fax: (86 ) 75 5-8 204 670 copyri ght ?2 006 chipho m e r te chn o log y limited 2
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