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1 ltc3525-3.3/ltc3525-5 3525f mp3 players portable instruments glucose meters digital cameras 400ma micropower synchronous step-up dc/dc converter with output disconnect up to 95% efficiency output disconnect and inrush current limit fixed output voltages of 3.3v or 5v delivers 60ma at 3.3v from a 1v input, or 140ma at 3.3v from a 1.8v input delivers 175ma at 5v from a 3v input burst mode operation: i q = 7 a only three external components 1v to 4.5v input range <1 a shutdown current antiringing control short-circuit and overtemperature protection very low profile of 1mm tiny 6-pin sc-70 package ltc3525-3.3 efficiency and power loss vs load current features applicatio s u typical applicatio u the ltc 3525-3.3/ltc3525-5 are high efficiency syn- chronous step-up dc/dc converters with output discon- nect that can start up with an input as low as 1v. they offer a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or li-ion applications. only three small external components are required. the ltc3525 is offered in fixed output voltages of 3.3v or 5v. the device includes a 0.5 ? n-channel mosfet switch and a 0.8 ? p-channel synchronous rectifier. peak switch current ranges from 150ma to 400ma, depending on load, providing enhanced efficiency. quiescent current is an ultralow 7 a, maximizing battery life in portable applica- tions. other features include <1 a shutdown current, anti- ringing control and thermal shutdown. the ltc3525 is available in a tiny 6-pin sc-70 package. l1* 10 h 3525 ta01 ltc3525-3.3 *murata lqh32cn100k53 v out 3.3v 60ma v out gnd sw shdn gnd v in v in 1v to 1.6v 10 f 1 f off on load (ma) 0.01 0.1 efficiency (%) 100 90 80 70 60 50 40 30 20 power loss (mw) 100 10 1 0.1 0.01 1 10 1000 100 lt3525 ?ta02 efficiency power loss v in = 3v v in = 2.4v v in = 1.2v descriptio u , ltc and lt are registered trademarks of linear technology corporation. burst mode is a registered trademark of linear technology corporation. all other trademarks are the property of their respective owners. patents pending
2 ltc3525-3.3/ltc3525-5 3525f parameter conditions min typ max units input start-up voltage 0.85 1 v output voltage (note 6) 3.20 3.30 3.40 v quiescent current, v out shdn = v in (note 4) 7 15 a quiescent current, v in shdn = v in (note 4) 0.5 3 a quiescent current, v in - shutdown shdn = 0v, v out = 0v 0.1 1 a not including switch leakage nmos switch leakage v in = v out = v sw = 5v, shdn = 0v 0.1 1 a pmos switch leakage v in = v sw = 5v, v out = 0v, shdn = 0v 0.1 3 a nmos switch on resistance 0.5 ? pmos switch on resistance 0.8 ? peak current limit 0.4 0.45 a shdn threshold 0.4 0.6 1 v shdn input current v shdn = v in or v out 0.01 1 a v in , v out voltage ........................................ 0.3v to 6v sw voltage ................................................ 0.3v to 6v sw voltage < 100ns ................................... 0.3v to 7v shdn voltage ............................................ 0.3v to 6v operating temperature range (notes 2, 5) ........................................ 40 c to 85 c storage temperature range ................ 65 c to 125 c lead temperature (soldering, 10 sec)................. 300 c absolute axi u rati gs w ww u package/order i for atio uu w the denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v in = 1.2v, v shdn = 1.2v, v out = 3.3v unless otherwise noted. electrical characteristics (note 1) (ltc3525-3.3) t jmax = 125 c ja = 256 c/ w in free air, ja = 150 c/ w on board over ground plane order part number consult ltc marketing for parts specified with wider operating temperature ranges. order options tape and reel: add #tr lead free: add #pbf lead free tape and reel: add #trpbf lead free part marking: http://www.linear.com/leadfree/ ltc3525esc6-3.3 ltc3525esc6-5 shdn 1 gnd 2 v in 3 6 sw 5 gnd 4 v out top view sc6 package 6-lead plastic sc70 sc6 part marking lbtg lbwt
3 ltc3525-3.3/ltc3525-5 3525f parameter conditions min typ max units input start-up voltage 0.85 1 v output voltage (note 6) 4.85 5.00 5.15 v quiescent current, v out shdn = v in 818 a quiescent current, v in shdn = v in 1.5 5 a quiescent current, v in - shutdown shdn = 0v, v out = 0v 0.1 1 a not including switch leakage nmos switch leakage v in = v out = v sw = 5v, shdn = 0v 0.1 1 a pmos switch leakage v in = v sw = 5v, v out = 0v, shdn = 0v 0.1 3 a nmos switch on resistance 0.4 ? pmos switch on resistance 0.7 ? peak current limit 0.4 0.5 a shdn threshold 0.4 0.6 1 v shdn input current v shdn = v in or v out 0.01 1 a the denotes specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v in = 2.4v, v shdn = 2.4v, v out = 5v unless otherwise noted. electrical characteristics note 1: absolute maximum ratings are those values beyond which the life of the device may be impaired. note 2: the ltc3525e is guaranteed to meet performance specifications from 0 c to 70 c. specifications over the 40 c to 85 c operating temperature range are assured by design, characterization and correlation with statistical process controls. note 3: specification is guaranteed by design and not 100% tested in production. note 4: current measurements are performed when the ltc3525 is not switching. note 5: this ic includes overtemperature protection that is intended to protect the device during momentary overload conditions. junction temperature will exceed 125 c when overtemperature protection is active. continuous operation above the specified maximum operating junction temperature may impair device reliability. note 6: consult ltc marketing for other output voltage options. (ltc3525-5)
4 ltc3525-3.3/ltc3525-5 3525f v in (v) 0.5 1.0 i out (ma) 350 300 250 200 150 100 50 0 2.5 3.5 3525 g01 1.5 2.0 3.0 4.0 4.5 ltc3525-5 ltc3525-3.3 load (ma) 0.01 0.1 efficiency (%) 100 90 80 70 60 50 40 30 20 power loss (mw) 100 10 1 0.1 0.01 1 10 1000 100 3525 g04 efficiency power loss v in = 3v v in = 2.4v v in = 1.2v 3525 g02 250 200 150 100 50 0 load (ma) v in (v) 0.5 1.0 1.5 2.0 2.5 3.0 ltc3525-3.3 ltc3525-5 3525 g03 v in (v) 1.0 2.5 3.5 1.5 2.0 3.0 4.0 4.5 i in ( a) 50 45 40 35 30 25 20 15 10 5 0 ltc3525-5 ltc3525-3.3 load (ma) 0.01 0.1 efficiency (%) 100 90 80 70 60 50 40 30 20 10 0 power loss (mw) 1000 100 10 1 0.1 0.01 1 10 1000 100 3525 g05 efficiency power loss v in = 3.6v v in = 2.4v v in = 1.2v 3525 g06 load (ma) 04060 20 10 30 50 70 80 change in v out (%) 2.5 2.0 1.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?.0 ?.5 c out = 22 f c out = 10 f v in = 1.2v 3525 g07 load (ma) 0 140 160 120 100 20 40 60 80 180 change in v out (%) 2.5 2.0 1.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?.0 ?.5 c out = 22 f c out = 10 f v in = 2.4v 3525 g09 load (ma) 0 120 100 20 40 60 80 140 change in v out (%) 2.5 2.0 1.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?.0 ?.5 c out = 22 f c out = 10 f v in = 2.4v 3525 g08 load (ma) 040 20 10 30 50 60 change in v out (%) 2.5 2.0 1.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?.0 ?.5 c out = 22 f c out = 10 f v in = 1.2v typical perfor a ce characteristics uw t a = 25 c unless otherwise noted. maximum output current vs v in (for v out to drop 2.5%) maximum startup load vs v in (resitive load) no-load input current vs v in ltc3525-3.3 efficiency and power loss vs load ltc3525-5 efficiency and power loss vs load ltc3525-3.3 load regulation ltc3525-3.3 load regulation ltc3525-5 load regulation ltc3525-5 load regulation
5 ltc3525-3.3/ltc3525-5 3525f 1.0 2.5 3.5 1.5 2.0 3.0 4.0 4.5 3525 g14 120 100 80 60 40 20 0 switching delay ( s) v in (v) 3525 g12 load (ma) 0.1 burst frequency (khz) 40 35 30 25 20 15 10 5 0 110 c out = 10 f c out = 22 f 3525 g10 load (ma) 0 150 50 200 100 change in v out (%) 2.5 2.0 1.5 1.0 0.5 0 ?.5 ?.0 ?.5 ?.0 ?.5 c out = 22 f c out = 10 f v in = 3.6v 3525 g11 v in (v) 1.0 2.5 3.5 1.5 2.0 3.0 4.0 4.5 frequency (khz) 1200 1100 1000 900 800 700 600 500 400 300 ltc3525-5 ltc3525-3.3 l = 10 h 3525 g13 temperature ( c) ?0?0?0?0 0 change in v out (%) 80 40 50 20 10 30 70 60 0.4 0.3 0.2 0.1 ?.1 ?.2 ?.3 ?.4 0 typical perfor a ce characteristics uw ltc3525-5 load regulation switching frequency vs v in light load burst frequency vs load v out variation vs temperature (normalized to 25 c) startup delay coming out of shutdown ltc3525-3.3 input current and v out at startup ltc3525-3.3 output voltage ripple ltc3525-3.3 output voltage ripple t a = 25 c unless otherwise noted. 3525 g15 input current 100ma/div v out 1v/div 500 s/div v in = 1.2v 3525 g16 50mv/div i out = 80ma i out = 40ma i out = 5ma 50 s/div v in = 1.2v c out = 10 f 3525 g17 i out = 80ma i out = 40ma i out = 5ma 50 s/div v in = 1.2v c out = 22 f 50mv/div
6 ltc3525-3.3/ltc3525-5 3525f typical perfor a ce characteristics uw ltc3525-5 output voltage ripple ltc3525-5 output voltage ripple ltc3525-3.3 50ma load step response ltc3525-3.3 100ma load step response ltc3525-5 100ma load step response t a = 25 c unless otherwise noted. 3525 g21 output ripple 50mv/div load current 20ma/div v in = 1.2v c out = 22 f 500 s/div 3525 g22 output ripple 50mv/div load current 50ma/div v in = 2.4v c out = 22 f 500 s/div 3525 g20 i out = 200ma i out = 100ma v in = 3.6v c out = 22 f i out = 20ma 50 s/div 50mv/div 3525 g19 i out = 150ma i out = 50ma v in = 2.4v c out = 22 f i out = 5ma 50 s/div 50mv/div 3525 g23 output ripple 50mv/div load current 50ma/div v in = 3.6v c out = 22 f 500 s/div ltc3525-3.3 output voltage ripple 3525 g18 i out = 190ma i out = 100ma i out = 5ma 50 s/div v in = 2.4v c out = 22 f 50mv/div
7 ltc3525-3.3/ltc3525-5 3525f uu u pi fu ctio s _____ shdn (pin 1): logic controlled shutdown input. connect to a voltage >1v to enable the ltc3525. connect to a voltage <0.4v to disable the ltc3525. gnd (pins 2, 5): ground. v in (pin 3): input voltage. the ltc3525 is powered from v in until v out exceeds v in . once v out is greater than (v in + 0.2v typical), it is powered from v out . place a ceramic bypass capacitor from v in to gnd. a minimum value of 1 f is recommended. v out (pin 4): output voltage sense and the output of the synchronous rectifier. connect the output filter capacitor from v out to gnd, close to the ic. a minimum value of 10 f ceramic is recommended. use 22 f for reduced output ripple. the output disconnect feature disconnects v out from v in when shdn is <0.4v. sw (pin 6): switch pin. connect an inductor from this pin to v in . an internal antiringing resistor is connected across sw and v in after the inductor current has dropped to zero to minimize emi. block diagra w + + + + + 3 6 1 2 4 v ref i pk comparator i valley comparator sleep comparator integrator wake tsd i val v out v in shdn sw i pk adjust gnd fb offset adjust offset adjust logic gate drivers and anti-cross conduction well switch v best v ref uvlo thermal shutdown vb shutdown startup uvlo shutdown shutdown v ref v sel v out 3525 bd
8 ltc3525-3.3/ltc3525-5 3525f the ltc3525 is a high performance burst mode operation only, synchronous boost converter requiring only three small external components. its simplicity and small size make it a high efficiency alternative to charge pump designs. it is designed to start up from a single alkaline or nickel cell, with input voltages as low as 1v, or from two or three cells (or a li-ion battery), with voltages as high as 4.5v. once started, v in can be as low as 0.5v (depending on load current) and maintain regulation. the output voltage is preset internally to either 3.3v or 5v. peak switch current is 400ma minimum, providing regulation with load currents up to 150ma, depending on input voltage. synchronous rectification provides high efficiency opera- tion while eliminating the need for an external schottky diode. true output disconnect eliminates inrush current at start-up, and allows v out to be disconnected from v in , for zero shutdown current. the output disconnect feature also allows the ltc3525 to maintain regulation with an input voltage equal to or greater than v out . note, however, that the synchronous rectifier is not enabled in this mode resulting in lower efficiency and reduced output current capability. the operating quiescent current is only 7 a typical, allow- ing the converter to maintain high efficiency at extremely light loads. shutdown the ltc3525 is shut down by pulling shdn below 0.4v, and made active by raising it above 1v. note that shdn can be driven as high as 6v, however, if it is more than 0.9v above the higher of v in or v out , the shdn input current will increase from zero to 1.5 a. after the shdn pin rises, there is a short delay before switching starts. the delay is 20 s to 120 s, depending on input voltage (see typical performance characteristics curve). start-up a start-up oscillator allows the ltc3525 to start with input voltages as low as 1v. it remains in start-up mode until two conditions are met. v out must exceed v in by at least 0.2v typical and either v in or v out must be greater than 1.8v typical. during startup, the synchronous rectifier is not enabled, and the internal p-channel synchronous rectifier acts as a follower, causing the peak voltage on sw to reach (v in + 1v) typical. this limits inrush current by maintaining control of the inductor current when v out is less than v in . to reduce power dissipation in the p-channel synchro- nous rectifier when the output is shorted, a foldback feature is incorporated that reduces the peak inductor current when v in is more than 1.7v greater than v out . normal operation once v out has increased more than 0.2v typical above v in , and either voltage is above 1.8v, normal operation begins, with synchronous rectification enabled. in this mode, the internal n-channel mosfet connected between sw and gnd stays on until the inductor current reaches a maximum peak value, after which it is turned off and the p-channel synchronous rectifier is turned on. it stays on, delivering current to the output, until the inductor current has dropped below a minimum value at which point it turns off and the cycle repeats. when the output voltage reaches its regulated value both switches are turned off and the ltc3525 goes to sleep, during which time the output capacitor supplies current to the load. once the output voltage drops approximately 9mv below the regu- lation value the ic leaves sleep mode and switching is resumed. the ltc3525 has been designed for low output voltage ripple. the output voltage ripple is typically only 20mv peak-to-peak at light load and 60mv peak-to-peak at full operatio u
9 ltc3525-3.3/ltc3525-5 3525f load using the minimum recommended 10 f output ca- pacitor for the ltc3525-3.3 and a 22 f capacitor for the ltc3525-5 (due to the capacitor? dc bias effect). an antiring circuit damps any oscillation at the switch node when the inductor current falls to zero. power adjust feature the ltc3525 incorporates a feature that maximizes efficiency at light load while providing increased power capability at heavy load by adjusting the peak and valley of the inductor current as a function of load. lowering the peak inductor current to 150ma at light load optimizes efficiency by reducing conduction losses in the internal mosfet switches. as the load increases, the peak induc- tor current is automatically increased to a maximum of 400ma. at intermediate loads, the peak inductor current may vary from 150ma to 400ma. figure 1 shows an example of how the inductor current changes as the load increases. please note that output capacitor values greater than 47 f will result in higher peak currents than neces- sary at light load. this will lower the light load efficiency. the valley of the inductor current is automatically adjusted as well, to maintain a relatively constant inductor ripple current. this keeps the switching frequency relatively constant. the maximum average load current that can be supported is given by: i v v amps o max in o () = 03 . where is the efficiency (see typical performance char- acteristics). the ?urst?frequency (how often the ltc3525 delivers a burst of current pulses to the load) is determined by the internal hysteresis (output voltage ripple), the load current and the amount of output capacitance. all burst mode operation or hysteretic converters will enter the audible frequency range when the load is light enough. however, due to the low peak inductor current at light load, circuits using the ltc3525 do not typically generate any audible noise. figure 1. inductor current changing as a function of load operatio u 3525 f01 inductor current 100ma/div load current 50ma/div 10 s/div
10 ltc3525-3.3/ltc3525-5 3525f component selection inductor values between 4.7 h and 15 h are recom- mended. in most applications 10 h will yield the best compromise between size and efficiency. the inductor should be a low-loss ferrite design and must be rated for peak currents of at least 400ma without saturating. induc- tors with lower dc resistance will improve efficiency. note that the inductor value does not have a significant effect on ripple current, so while lower values will increase the operating frequency, they do not reduce output voltage ripple. some recommended inductor examples are murata lqh32c and coilcraft lpo4812, lpo3310, do3314, ds1608 and mss4020. a ceramic input bypass capacitor should be located as close as possible to the v in and gnd pins of the ic. a minimum value of 1 f is recommended. if the battery is more than a few inches away, a bulk tantalum decoupling cap of at least 10 f is recommended on v in . the output capacitor should also be a ceramic, located close to the v out and gnd pins. a minimum value of 10 f is recommended. increasing the value of the output ca- pacitor to 22 f will result in lower output ripple. higher capacitor values will only offer a small reduction in output ripple, while reducing light load efficiency by causing the peak inductor current to increase above its minimum value of 150ma. the input and output capacitors should be x5r or x7r types, not y5v. supplier phone fax website murata usa: (814) 237-1431 usa: (814) 238-0490 www.murata.com coilcraft (847) 639-6400 (847) 639-1469 www.coilcraft.com sumida usa (847) 956-0666 usa (847) 956-0702 www.sumida.com table 1. inductor vendor information table 2. capacitor vendor information supplier phone fax website murata usa: (814) 237-1431 usa: (814) 238-0490 www.murata.com taiyo yuden (408) 573-4150 (408) 573-4159 www.t-yuden.com tdk (847) 803-6100 (847) 803-6296 www.component.tdk.com avx (803) 448-9411 (803) 448-1943 www.avxcorp.com figure 2. recommended component placement operatio u shdn gnd v in sw gnd v out ltc3525 shdn v in 3525 f02 v out
11 ltc3525-3.3/ltc3525-5 3525f u package descriptio information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. sc6 package 6-lead plastic sc70 (reference ltc dwg # 05-08-1638) 1.15 ?1.35 (note 4) 1.80 ?2.40 0.15 ?0.30 6 plcs (note 3) 0.10 ?0.18 (note 3) sc6 sc70 0802 1.80 ?2.20 (note 4) 0.65 bsc pin 1 0.80 ?1.00 1.00 max 0.00 ?0.10 ref 0.10 ?0.40 0.10 ?0.30 note: 1. dimensions are in millimeters 2. drawing not to scale 3. dimensions are inclusive of plating 4. dimensions are exclusive of mold flash and metal burr 5. mold flash shall not exceed 0.254mm 6. details of the pin 1 indentifier are optional, but must be located within the index area 7. eiaj package reference is eiaj sc-70 3.26 max 0.47 max 0.65 ref recommended solder pad layout per ipc calculator 0.96 min 2.1 ref 1.16 ref index area (note 6) single alkaline or nimh to 3.3v converter with 1mm profile 2-alkaline or nimh to 3.3v li-ion to 5v 6.8 h* 3525 ta05 ltc3525-3.3 *coilcraft lpo3310-682mxd **murata grm219r60j106ke191d v out 3.3v 60ma 4 1 25 6 3 v out gnd sw shdn gnd v in 1v to 1.6v 10 f** 6.3v 1 f 10 h* 3525 ta06 ltc3525-3.3 *murata lqh32cn1002k53 v out 3.3v 140ma 4 1 25 6 3 v out gnd sw shdn gnd v in 1.8v to 3.2v 10 f 1 f 10 h* 3525 ta07 ltc3525-5 *coilcraft mss4020-103mxd v out 5v 175ma 4 1 2 li-ion 5 6 3 v out gnd sw shdn gnd v in 3v to 4.2v 10 f 1 f off on typical applicatio s u
12 ltc3525-3.3/ltc3525-5 3525f ? linear technology corporation 2005 lt/tp 0805 500 ? printed in the usa related parts linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com part number description comments lt 1615/lt1615-1 300ma/80ma (i sw ), high efficiency step-up dc/dc converter v in : 1v to 15v, v out(max) = 34v, i q = 20 a, i sd <1 a, thinsot package ltc1751-3.3/ 100ma, 800khz, micropower, regulated charge pump v in : 2.5v to 5.5v, v out(max) = 3.3v/5v, i q = 20 a, ltc1751-5 dc/dc converters i sd <1 a, ms8 package lt1930/ltc1930a 1a (i sw ), 1.2mhz/2mhz, high efficiency step-up dc/dc converter high efficiency, v in : 2.6v to 16v, v out(max) = 34v, i q = 4.2ma/5.5ma, i sd <1 a, thinsot package ltc3200-5 100ma, 2mhz, regulated 5v charge pump v in : 2.7v to 4.5v, v out(max) = 5v, i q = 2ma, i sd <1 a, thinsot package ltc3400/ltc3400b 600ma (i sw ), 1.2mhz, synchronous step-up dc/dc converter 92% efficiency, v in : 0.5v to 5v, v out(max) = 5v, i q = 19 a/300 a, i sd <1 a, thinsot package ltc3401 1a (i sw ), 3mhz, synchronous step-up dc/dc converter 97% efficiency, v in : 0.5v to 5v, v out(max) = 5.5v, i q = 38 a, i sd <1 a, ms package ltc3402 2a (i sw ), 3mhz, synchronous step-up dc/dc converter 97% efficiency, v in : 0.5v to 5v, v out(max) = 5.5v, i q = 38 a, i sd <1 a, ms package ltc3421 3a (i sw ), 3mhz, synchronous step-up dc/dc converter 95% efficiency, v in : 0.5v to 4.5v, v out(max) = 5.25v, with output disconnect i q = 12 a, i sd <1 a, qfn-24 package ltc3425 5a (i sw ), 8mhz, 4-phase synchronous step-up dc/dc converter 95% efficiency, v in : 0.5v to 4.5v, v out(max) = 5.25v, with output disconnect i q = 12 a, i sd <1 a, qfn-32 package ltc3429/ltc3429b 600ma, 500khz single/dual cell micropower synchronous 95% efficiency, v in : 1v to 4.5v, v out(max) = 5v, boost converter with output disconnect i q = 20 a, i sd <1 a, sc-70 package ltc3458 1.4a (i sw ), 1.5mhz, synchronous step-up dc/dc converter v in : 1.5v to 6v, v out(max) = 7.5v, i sd <1 a, with output disconnect 3mm 4mm dfn package ltc3458l 1.7a (i sw ), 1.5mhz, synchronous step-up dc/dc converter v in : 1.5v to 6v, v out(max) = 6v, i sd <1 a, with output disconnect 3mm 4mm dfn package ltc3459 60ma, 10v micro power synchronous boost converter 95% efficiency, v in : 1.5v to 6v, v out(max) = 10v, i q =10 a, i sd <1 a, thinsot package lt3464 85ma (i sw ), high efficiency step-up dc/dc converter v in : 2.3v to 10v, v out(max) = 34v, i q = 25 a, with integrated schottky and pnp disconnect i sd <1 a, thinsot package 3.3v to 5v converter with 1.4mm profile 10 h* 3525 ta08 ltc3525-5 *coilcraft do3314-103mxd **murata grm21br60j226me39l v out 5v 200ma 4 1 25 6 3 v out gnd sw shdn gnd v in 3.3v 22 f ** 6.3v 1 f u typical applicatio

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