ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 1 - des cr ip tion fea tur e s the a7596 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 3a load with excellent line and load regulation. these devices are available in fixed output voltage of 5v and adjustable output version. the a7596 operates at a switching frequency of 150khz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. other features include a guaranteed 3% tolerance on output voltage under specified input voltage and output load conditions, and 15% on the oscillator frequency. external shutdown is included, featuring typically 100 a standby current. the a7596 is available in to - 263 -5 package. orderi ng i nfor m a tion p ac k ag e ty pe p art n um be r to - 263 -5 s5 a7596s5r- xx x a7596s5vr- xx x a7596s5u- xxx a7596s5vu-xxx note xx x: output voltage 050=5.0v; adj=adjustable u = tube r: tape & reel v: halogen free package ait provides all rohs products suffix v means halogen free package ? 5v and adjustable output versions ? adjustable version output voltage range 1.23v to 37v ? input voltage range up to 40v ? guaranteed 3a output current ? 150khz fixed frequency internal oscillator ? built-in thermal shutdown and current limit protection ? available in to -263-5 package a p p l icati on ? fixed voltage power supply for lcd monitor and lcd tv ? on -card switching regulation ? simple high efficiency step-down regulator typ ical a p p l icati on v out = 1.23v x (1+ r1/r2) , c in = 100 f, aluminum electrolytic; c out = 220 f, 25v, aluminum electrolytic ; d1 = schottky, 5a/40v ; l1 = 33 h figure 1 adjustable output voltage c in = 100 f, aluminum electrolytic; c out = 220 f, 25v, aluminum electrolytic; d1 = schottky, 5a/40v; l1 = 33 h figure 2 fixed voltage regulator:
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 2 - p in de s cr ip tion top view p i n # s y mb ol f u nc ti on 1 v in input voltage pin 2 v out output voltage pin 3 gnd ground pin 4 fb feed back pin 5 /en enable pin
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 3 - a b s ol ute max imu m rati n gs p d , power dissipation internally limited(w) v in , maximum supply voltage 45 v en , en pin input voltage -0.3v < v < + v in jt , thermal resistance junction to case 3.0 c /w ja , thermal resistance junction to ambient 36 c /w t j , operating junction temperature range - 40 c~+125 c t stg , storage temperature range - 65 c~+150 c esd , minimum eds rating 2 kv t lead , lead soldering temperature (soldering, 10 sec) 260 c stress beyond above listed absolute maximum ratings may lead permanent damage to the devi ce. these are stress ratings only and operations of the device at these or any other condit ions beyond those indicated in the operational sections of t he specifications are not implied. exposure to absolute maximum rating conditions for ex tended periods may affect device reliability. recom m e nd e d op e rating cond itio ns p ara me t er s y mb ol m in t y p. m ax u ni ts input voltage v in 40 v peak current i pc 3.4 a maximum load current i out 3 a junction temperature t j - 40 150 c
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 4 - e l e ctr ical characteris tics these specifications apply v in = 12v for 5.0v options, and v in = 24v for adj option, and the operating ambient temperatures t a = 25c , unless otherwise specified p ara me t er s y mb ol c on d i t i on s m i n . t y p. m ax . u ni t output voltage note1 v out 4.5v Q v in Q 40v 0.2a Q i out Q 2a,v out = 3v adj 1.193 1.230 1.267 v 7v Q v in Q 40v 0.2a Q i out Q 3a 5.0 4.850 5.000 5.150 efficiency v in =12v, i load =3a, v out =3v adj 90 % v in =12v, i load = 3a 5.0 80 feeback bias current i b v fb =1.3v (adjustable version only) 10 50 na saturation voltage v sat i out =3a note1,2 1.16 1.4 v duty cycle (on) dc note2 100 % duty cycle (off) dc note3 0 % oscillator frequency f o note4 127 150 173 khz output leakage current i l output=0v note1, 3 100 a output=-0.9v note5 2 ma quiescent current i q note3 5 ma standby current i stby /en pin=5v 100 200 a /en pin input level v ih low (on) 1.3 0.6 v v il high (off) 2.0 1.4 i h v level = 2.5v (off) 5 15 a i l v level = 0.5v (on) 0.02 5 note1: no diode, inductor or capacitor connected to output pin. note2: feedback pin removed from output and connected to 0 v to force the output transistor switch on. note3: feedback pin removed from output and connected to 5 v and the adj version note4: the switching frequency is reduced when the second stage current limit is activated. note5: v in = 40v.
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 5 - typ ical p e rfor m a n ce ch a racteris tics 25 unless note 1. switch saturation voltage 2. switch current limit 3. dropout voltage 4. operating quiescent current 5. shutdown quiescent current 6. minimum operating supply voltage
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 6 - 7. /en pin current (sinking) 8. switching frequency
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 7 - b l ock dia gra m
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 8 - p a cka ge i nfor m a tion dimension in to - 263 -5 (unit: mm) s y mb ol m i n m ax a 10.030 10.670 b 8.250 9.170 c 4.340 4.590 d 1.140 1.400 e 0.330 0.432 f 0.737 0.889 g 1.570 1.830 i 12.700 1.650 k 14.600 16.130 l 2.290 2.790 m 7 n 3
ait s e m ic o n d u c t o r in c . www.ait-ic.com a7 5 9 6 dc -dc converter/ buck (step-down) 150khz, 3a pwm buck dc-dc converter rev1.2 - may 20 09 released, mar 2015 update - - 9 - impo rtant noti ce ait semiconductor inc. (ait) reserves the right to make changes to any its product, specifications, to discontinue any integrated circuit product or service without notice, and advis es its customers to obtain the latest version of relevant information to verify, before placing orders, that the information being relied on is current. ait semiconductor inc.'s integrated circuit products are not designed, intende d, authorized, or warranted to be suitable for use in life support applications, devices or systems or other cri tical applications. use of ait products in such applications is understood to be fully at the risk of the customer. as used her ein may involve potential risks of death, personal injury, or servere property, or environmental damage. in order to minimize risks associated with the customer's applications, the customer should provide adequat e design an d operating safeguards. ait semiconductor inc. assumes to no liability to customer product design or appl ication support. ait warrants the performance of its products of the specifications applicable at the time of sale.
|
