unisonic technologies co., ltd L5201 cmos ic www.unisonic.com.tw 1 of 7 copyright ? 2005 unisonic technologies co., ltd qw-r502-107,a low noise, regulated charge pump dc/dc converters description the utc L5201-xx series are low noise, constant frequency charge pump dc/dc converters and designed to increase efficiency in white led application. the oper ating voltage range is 2.7v ~ v out input with up to 100ma of output current. low external parts counts (one flying capacitor and two small bypass capacitors at v in and v out ) make the utc L5201-xx series ideally suited for small, battery-powered applications. a charge-pump architecture maintains constant switching frequency to zero load and reduces both output and input ripple. the utc L5201-xx series have thermal shutdown capability to escape the device damaged from a continuous short-circuit. with built-in soft-start circuitry to prevents excessive current flow at v in during start-up. high switching frequency enables the use of small ceramic capacitors. a low-current shutdown feature disconnects the load from v in and reduces quiescent current to <1a. the L5201-adj is available in msop-8 package and L5201-fixed in sot-26 and tsot-26 package. features * low noise constant frequency operation * output current: 90ma@3.0vL5201l ordering information ordering number normal lead free plating package packing L5201-ad-sm1-r L5201l-ad-sm1-r msop-8 tape reel L5201-ad-sm1-t L5201l-ad-sm1-t msop-8 tube L5201-xx-ag6-r L5201l-xx-ag6-r sot-26 tape reel L5201-xx-ah6-r L5201l-xx-ah6-r tsot-26 tape reel note: xx :output voltage L5201l-ad-sm1-r (1)packing type (2)package type (4)lead plating (1) r: tape reel, t: tube (2) sm1: msop-8, ag6: sot-26, ah6: tsot-26 (4) l: lead free plating, blank: pb/sn (3)output voltage (3) ad: adj, xx: 45:4.5v, 50:5.0v
L5201 cmos ic unisonic technologies co., ltd 2 of 7 www.unisonic.com.tw qw-r502-107,a marking (for sot-26/tsot-26) 54 3 voltage code 2 1 l f 6 lead plating pin configurations 3 2 1 4 5 6 4 3 2 1 5 6 7 8 msop-8 v out fb shdn sgnd pgnd v in c + sot-26/tsot-26 c + v in c - c - v out gnd shdn utc L5201-adj utc L5201-xx (fixed ) pin description pin no. L5201-adj L5201-xx msop-8 sot-26/tsot-26 pin name function 1 6 c+ flying capacitor positive terminal 2 5 v in input supply voltage, should be bypassed with at least 6.8f lo x esr ceramic capacitor. 3 4 c flying capacitor negative terminal 4, 5 2 gnd ground terminal, should be tied to a ground plane for best performance 6 3 shdn shutdown mode, active-low input. a low on shdn disables the L5201 series. shdn must not be allowed to float. 7 x fb feedback input pin for adjustable output. an output divider should be connected from v out to fb to program the output voltage. 8 1 v out regulated output voltage, should be bypassed with at least 6.8f low esr ceramic capacitor as close as possible to the pin for best performance x : the pin is inexistent for sot-26 and tsot-26 package.
L5201 cmos ic unisonic technologies co., ltd 3 of 7 www.unisonic.com.tw qw-r502-107,a block diagram utc L5201 adjustable version (msop-8) charge pump oscillator switch control shdn v out fb v in sgnd pgnd c c + - - + error amplifier 1.268v soft - start utc L5201 fixed version (sot-26/tsot-26) charge pump oscillator switch control shdn v out v in gnd c c + _ _ + error amplifier 1. 268v soft- start
L5201 cmos ic unisonic technologies co., ltd 4 of 7 www.unisonic.com.tw qw-r502-107,a absolute maximum ratings parameter symbol ratings unit input voltage(to gnd) v in -0.3 ~ 6 v charge pump voltage(to gnd) v out -0.3 ~ 5.5 v shutdown voltage(to gnd) v shdn -0.3 ~ (v in +0.3) v maximum dc output current (note 1) i out 150 ma v out short-circuit duration indefinite operating temperature t opr -40 ~ +85
storage temperature t stg -40 ~ +150
note: 1. based on long-term current density limitations. 2. absolute maximum ratings are those values beyond which the device c ould be permanently damaged. absolute maximum ratings are stress ratings onl y and functional device operat ion is not implied. electrical characteristics (v cc =v shdn = 3v, ta=25c, c fly =1f, c in =10f, c out =10f, unless otherwise specified.) parameter symbol test conditions min typ max unit input voltage v in v out =5.0v 2.7 v out v no switching supply current i q 2.7v ? v in ? 5v, i out =0ma, shdn=v in , v out =5.5v 90 140 a 2.7v ? v in ? 5v, i out 50ma L5201-4.5v 3.0v ? v in ? 5v, i out 100ma 4.32 4.5 4.68 2.7v ? v in ? 5v, i out 40ma output voltage L5201-5.0v v out 3.0v ? v in ? 5v, i out 90ma 4.8 5 5.2 v high v ih 1.4 v shdn input threshold low v il 0.3 v feedback voltage (for L5201-adj) v fb 1.217 1.268 1.319 v v in = 3v, i out = 50ma 25 ripple voltage (for L5201-fixed) v r v in = 3v, i out = 90ma 25 mv p-p shutdown supply current i shdn 2.7v ? v in ? 5v, i out =0ma, v shdn = 0 1 a feedback input current (for L5201-adj) i fb v fb =1.4v -50 50 na v in = 2.7v, i out = 40ma 88 efficiency (for L5201-fixed) v in = 3v, i out = 90ma 80 % frequency f osc oscillator free running 0.7 1 1.3 mhz v out turn-on time t on v in = 3v, i out = 0ma 0.35 ms short-circuit current i sc v in = 3v, v out = gnd, shdn = 3v 340 ma thermal shutdown temperature t sd 150
thermal shutdown hysteresis 30
L5201 cmos ic unisonic technologies co., ltd 5 of 7 www.unisonic.com.tw qw-r502-107,a typical application circuit shdn v out v in gnd c + c _ v in v out = 5 v + _ 2% 1 2 3 5 on off 2.7 v ~ i out up ~ 40 ma , v in 2.7v i out up ~ 90 ma , v in 3.0v 6 4 v out c in , c out : taiyo yuden, jmk212bj106kg c fly : taiyo yuden, emk212jb105kg 10 f 10 f 10 f
L5201 cmos ic unisonic technologies co., ltd 6 of 7 www.unisonic.com.tw qw-r502-107,a typical characteristics ch1 2.00v ch2 2.00v 100 s ch1 1. 52v 2 1 startup time with 50ma load t t v out v shdn ch1 2.00v ch2 2.00v 100 s ch1 1.52v 2 1 startup time with 90ma load t t v out v shdn ch1 10.0mv m 1.00 s ch1 5. 60mv 1 output ripple with i out =50ma t t ch1 10.0mv m 1.00 s ch1 5. 40mv 1 output ripple with i out =90ma t t 010 304050 70 90 output current (ma) o u t p u t v o l t a g e ( v ) output voltage vs output current 20 60 80 4.8 4. 85 4.9 4. 95 5 5. 05 5.1 5. 15 5.2 v in =3.6v v in =2.7v v in =3.0v 5.2 5.05 4.95 4.8 2.5 3.0 3.5 4.0 4.5 5.0 supply voltage (v) 4.85 5 5.1 output voltage vs supply voltage t a = 25 4.9 5.15 t a = -40 i out =20ma ta = 100
L5201 cmos ic unisonic technologies co., ltd 7 of 7 www.unisonic.com.tw qw-r502-107,a typical characteristics(cont.) -40 -20 0 20 40 100 o u t p u t v o l t a g e ( v ) output voltage vs temperature 60 80 4.8 4.85 4.9 4.95 5 5.05 5.1 5.15 5.2 v in =3.0v temperature ( ) i out =50ma 1200 1050 850 700 2.5 3.0 3.5 4.0 4.5 5.0 supply voltage (v) f r e q u e n c y ( m h z ) frequency vs supply voltage t a = 25 1150 1100 1000 950 900 800 750 t a = -40 t a = 100 100 0 0.01 10 100 load current (ma) e f f i c i e n c y ( % ) 30 70 efficiency vs load current 40 40 50 80 0.1 1 1000 20 60 90 v in = 2.7v v in = 3.0v v in = 3.3v v in = 3.6v 1200 1050 850 700 -40 -20 20 40 60 100 f r e q u e n c y ( m h z ) frequency vs. temperature 1150 1100 1000 950 900 800 750 0 80 temperature ( ) utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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