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ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 1 d escription the ace 25 9 6 series of regulators are fixed frequency pwm buck (step - down) dc/dc converter, capable of driving a 3a load with excellent line and load regulation. these regulators include internal frequency compensation and a fixed frequency osc illator so that they are easy to use. a system adopting ace2596 requires a minimum number of external components to work. a standard series of inductors, optimized for use with the ace2596 series, are available from several manufacturers. this feature grea tly simplifies the design of switch - mode power supplies. these ics are available in to - 263 - 5 packages. features ? 3.3v, 5v, 12v fixed( 4% tolerance) and adjustable ( 3% tolerance) output versions ? guaranteed 3a output load current ? 150khz fixed frequency inte rnal oscillator ? input voltage range up to 32v ? requires only 4 external components ? high efficiency up to 90% ? excellent line and load regulation ? ttl shutdown capability ? low power standby mode, i q typically 80 a ? built - in current limit protection and thermal shutdown circuit application ? lcd monitor and lcd tv ? on - card dc - dc converter ? dvd recorder ? pdp absolute maximum ratings p arameter s ymbol m ax u nit input voltage v in 40 v on/off pin voltage v on/off 40 v feedback pin voltage v fb 40 v operating junction temperature t j 150 o c thermal resistance ( junction to ambient, no heatsink) to - 263 - 5 r ja 60 o c /w lead temperature (soldering, 10sec) t lead 260 o c storage temperature range t stg - 65 to150 o c note : str esses greater than those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device ate these or any other conditions beyond those indicated unde r recommended ope rating conditions is not implied. exposure to absolute maximum ratings for extended peri ods may affect device reliabilit y.
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 2 packaging type to - 263 - 5 (w m) 5. on/off 4. fb 3. gnd 2. vout 1. vin ordering information ace25 9 6 xx xxx + h functional block diagram wm :to - 263 - 5 output voltage 3.3v/5.0v/12v/adj pb - free halogen - free
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 3 re commended operating conditions parameter symbol value unit maximum input voltage (note 2) 3.3v v in 32 v 5.0v 32 12v 32 adj (v out =3.2v) 32 adj (v out =2.5v) 25 operating juncti on temperature t j - 40 to 125 o c note : for adj version, the recommended supply voltage depends on the needed output voltage. electrical characteristics for 3.3v output voltage version unless otherwise specified, t j =25 , the specifications with boldface type apply over full operating junc tion temperature range. parameter symbol conditions min typ max unit output vout 5.5v Q v in Q 32v, 0.2a Q i load Q 3a 3.168 3.135 3.3 3.432 3.465 v efficiency v in =12v, i load =3a 75 % for 5 v output voltage version unless otherwise specified, t j =25 , the specifications with boldface type apply over full operating junction temperature range. parameter symbol conditions min typ max unit output vout 7v Q v in Q 32v, 0.2a Q i load Q 3a 4.800 4.750 5 5. 200 5.250 v efficiency v in =12v, i load =3a 80 % for 12 v output voltage version unless otherwise specified, t j =25 , the specifications with boldface type apply over full operating junction temperature range. parameter symbol conditions min typ max unit output vout 15v Q v in Q 32v, 0.2a Q i load Q 3a 11.52 11.40 12.0 12.48 12.60 v efficiency v in =24v, i load =3a 88 %
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 4 for adj output voltage version unless otherwise specified, t j =25 , the specifications with boldface type apply over full operating junc tion temperature range. parameter symbol conditions min typ max unit output vout 4.5v Q v in Q 32v, 0.2a Q i load Q 3a v out programmed for 2.5v 1.193 1.180 1.23 1.267 1.280 v efficiency v in =12v, i load =3a, v out =2.5v 73 % electrical characteristics f or a all out put voltage versions unless otherwise specified, v in =12v for 3.3v, 5v and adjustable version, v in =24v for 12v version, i load =500ma, t j =25 . specifications with boldface type apply over full operating junction temperature range. parameter symbol conditions min typ max unit feedback bias current i fb adjustable version only, v fb =1.3v 10 50 100 na oscillator frequency f (note 3) 127 110 150 173 173 khz saturation voltage v sat i load =3a (no output devices, v fb =0v) 1.2 1.5 1.6 v maximum duty cycle d max v f b =0v 100 % minimum duty cycle d min v fb =1.3v 0 % current limit i cl peak current, no output devices, v fb =0v 3.6 3.4 4.5 6.9 7.5 a output leakage current i swl output=0v, no output devices, v fb =1.3v, v in =32v 50 a output= - 1v, no output devices, v fb =1.3v, v in =32v 2 30 ma quiescent current i q v fb =1.3v 5 10 ma standby quiescent current i stby on/off pin=5v, v in =18v 80 200 250 a on/off pin logic input threshold voltage v il regulator on 0.6 v v ih reg ulator off 2.0 v on/off pin input current i h v pin5 =2.5v (regulator off) 5 15 a i l v pin5 =2.5v (regulator on) 0.02 5 a note : 1. the switching frequency is reduced when the second stage current limit is activated. 2. the specifications with bold face are gbd (guaranteed by design).
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 5 typical per formance characteristics figure 1 . efficiency vs. output current figure 2 . efficiency vs. output current figure 3 . efficiency vs. output current figure 4 . efficiency vs. output current figure 5 . efficiency vs. in put current figure 6 . line regulation
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 6 figure 7 . load regulation figure 8 . switch saturation voltage vs. switch current figure 9 . switch current limit vs. junction temperature figure 10 . q uiescent current vs. supply voltage figure 1 1 . quiescent current limit vs. junction temperature figure 1 2 . shutdown quiescent curre nt vs. input voltage
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 7 figure 13 . on/off threshold voltage vs. junction temperature figure 14 . on/off pin current vs. on/off pin voltage figure 15 . switching frequency vs. junction temperature
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 8 typica l application ace2596 - 3.3v l1 : sumida cdrh127/ldnp - 220mc or equivalent figure 16. typical application of ace2596 - 3.3v ace 2596 - 5.0v l1 : sumida cdrh127/ldnp - 220mc or equivalent figure 17. typical application of ace2596 - 5.0v
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 9 ace2596 - adj l1 : sumida cdrh127/ldnp - 220mc or equivalent figure 18. typical application of ace2596 - 12v r2 3.69k r1 3.6k 4 12v c ff 2.5v unregulated feedb ack 33nf regulated dc input 1 ace2596 - adj 2 dc output 3a load vin output l1 22uh vout=1.23*((r2+r1)/r1) cin + gnd on/off + 470uf 3 5 d1 cout 1n5822 220uf l1 : sumida cdrh12 7/ldnp - 220mc or equivalent figure 19. typical application of ace2596 - adj
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 10 packing information to - 2 63 - 5
ace 2596 15 0khz 3a buck dc - dc converter ver 1. 3 11 notes ace does not assume any responsibility for use as critical component s in life support devices or systems without the express written approval of the president and general counsel of ace electronics co., ltd. as sued herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and shoes failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. 2. a critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. ace technology co., ltd. http://www.ace - ele.com /

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