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| 2009/06/15 ver.5 page 1 sp1937 dc-dc step-up converter for white led description applications the sp1937 is a step-up dc/dc converter for white led driver with constant current. the device can driver one to four leds in series from a single cell lithium ion battery. internal functions include current limiting; thermal shutdown and soft-s tart to prevent damage operate status. the sp1937 dc/dc converter operates at 1.2mhz and low output capacitor as small as 0.22uf; apply to lithium-ion powered systems. a low 95mv (typ) reference voltage minimizes power loss in the current setting resistor for better efficiency. z battery power equipment z notebook computers z pda z cellular phone z digital cameras z mp3 players z gps receivers features pin configuration sot-23-5l sot-353 ( sc-70-5l ) part marking sot-23-5l sot-353 ( sc-70-5l ) ? fast 1.2mhz switching frequency ? high efficiency up to 85% ? drives up to four leds from 3.2v supply ? low quiescent current ? disconnects leds in shutdown mode ? internal over temperature and current limiting shutdown function ? 36v rugged bipolar switch ? small package sot-23-5l & sot-353
2009/06/15 ver.5 page 2 sp1937 dc-dc step-up converter for white led typical applcation circuit pin description sp1937s25rg / sp1937s25rgb pin symbol description 1 sw switch pin. 2 gnd ground pin 3 fb feedback pin. 4 shdn shutdown pin. active-low enable 5 vin supply voltage input sp1937s36rg / sp1937s36rgb pin symbol description 1 sw switch pin. 2 gnd ground pin 3 fb feedback pin. 4 shdn shutdown pin. active-low enable 5 gnd ground pin 6 vin supply voltage input ordering information part number package part marking sp1937s25rg sot-23-5l 97yw sp1937s25rgb sot-23-5l 97yw sp1937s35rg sot-353 ( sc-70-5l ) 97yw sp1937s35rgb sot-353 ( sc-70-5l ) 97yw week code : a ~ z( 1 ~ 26 ) ; a ~ z( 27 ~ 52 ) sp1937s25rg : tape reel ; pb ? free sp1937s25rgb : tape reel ; pb ? free ; halogen - free sp1937s35rg : tape reel ; pb ? free sp1937s35rgb : tape reel ; pb ? free ; halogen - free 2009/06/15 ver.5 page 3 sp1937 dc-dc step-up converter for white led block diagram absoulte maximum ratings (t a =25 unless otherwise specified) parameter symbol value unit dc supply voltage v in 20 v sw voltage v sw 36 v fb voltage v fb 10 v shdn voltage v shdn 10 v operating temperature t opr -40 85 maximum junction temperature t j(max) 125 storage temperature t s -65 150 the ic has a protection circuit against static electricity. do not apply high static electricity or high voltage that exceeds the performance of the protection circuit to the ic. 2009/06/15 ver.5 page 4 sp1937 dc-dc step-up converter for white led electrical characteristics (t a =25 , v in =3v, v shdn =3v, unless otherwise specified) parameter conditions min. typ. max. unit operating voltage 2.5 20.0 v feedback voltage i sw =100ma, duty cycle = 66% 86 110 mv fb pin bias current 150 na 2.8 3.5 ma supply current v shdn = 0v 0.1 1.0 a switching frequency 0.8 1.2 1.6 mhz maximum duty cycle 85 % switch current limit 320 ma switch leakage current v sw = 5v 0.01 5 a switch vcesat i sw = 200ma 150 mv shdn voltage high 1.5 v shdn voltage low 0.4 v shdn pin bias current 90 ua 2009/06/15 ver.5 page 5 sp1937 dc-dc step-up converter for white led typical performerce characteristics 2009/06/15 ver.5 page 6 sp1937 dc-dc step-up converter for white led application information ch1: vcc / ch2: vsw / ch3: inductor current / r1= 6.8 ? vin=3v vout=8.972v iout=14.624ma vin=3.75v vout=8.957v iout=14.698ma vin=5v vout=8.963v iout=14.869ma vin=5.5v vout=8.959v iout=14.836ma 2009/06/15 ver.5 page 7 sp1937 dc-dc step-up converter for white led application circuit ( for po rtable system --- series ) 2009/06/15 ver.5 page 8 sp1937 dc-dc step-up converter for white led application circuit ( for l cd panel --- series & parallel ) 2009/06/15 ver.5 page 9 sp1937 dc-dc step-up converter for white led typical performerce characteristics( for lcd panel ) 2009/06/15 ver.5 page 10 sp1937 dc-dc step-up converter for white led sot-23-5l package outline 2009/06/15 ver.5 page 11 sp1937 dc-dc step-up converter for white led sot-353 package outline 2009/06/15 ver.5 page 12 sp1937 dc-dc step-up converter for white led information provided is alleged to be exact and consistent. sync power corporation presumes no responsibility for the penalties of use of such information or for any violation of pa tents or other rights of third parties which may result from its use. no license is granted by allegation or otherwise under any pate nt or patent rights of sync power corporation. conditions mentioned in this publication ar e subject to change without notice. this p ublication surpasses and replaces all information previously supplied. sync power corporation products are not authorized for use as critical components in life support devices or systems without express written approval of sync power corporation. ?the sync power logo is a registered trademark of sync power corporation ?2004 sync power corporation ? printed in taiwan ? all rights reserved sync power corporation 7f-2, no.3-1, park street nankang district (nksp), taipei, taiwan 115 phone: 886-2-2655-8178 fax: 886-2-2655-8468 http://www.syncpower.com |
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