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liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev1.5 1/12 pin configuration (1) to220-5l (2) to252-5l ( t o p v i e w ) ( t o p v i e w ) (3) to263-5l (top view) sy mbol name descriptions 1 vin operating voltage input 2 o u t p u t switching o u t p u t 3 g n d g r o u n d 4 fb output voltage feedback control 5 s d on/off s h u t d o w n features output voltage: 3.3v, 5.0v, 12v, and adjustable output version adjustable version output voltage range:1.23v to 37v4% 150khz15% fixed switching frequency voltage mode non-synchronous pwm control thermal-shutdown and current-limit protection on/off shutdown control input operating voltage can be up to 40v output load current: 3a low power standby mode built-in switching transistor on chip to220-5l to252-5l and to263-5l packages general description th e lsp31 2 2 s er ies are monolithic ic tha t design fo r a step-down dc/dc converter, and ow n the ability o f driving a 3 a load without additio nal transistor co mp one n t . du e to r educing th e numb e r o f e x terna l component, the board s pace can be saved easily. the e x terna l shutdown fu nction can b e contro lled by logic le vel a nd then come in to s t and by mod e . t h e in te rna l co mp ensa t io n mak e s fee dback co n t ro l have g ood line and lo ad re gu lation w i th ou t exter n a l d e s i g n . regarding protected function, thermal shutdown is to prevent over tempera t ur e operating from damag e, and current limit is a gain s t over cu r r e n t o p e r a t i n g o f the o u tp ut swit ch. th e l sp3 12 2 se ri e s o p e rat e s at a sw itch ing fr eq uenc y o f 150 khz t h u s a l l o w i n g s m a l l e r sized filter c o mponents than what would be need ed with lower frequency switching reg u lators. oth e r features include a g u a r a n t e e d 4 % t o l e r a n c e o n o u t p u t v o l t a g e u n d e r specified inp u t voltage and output load conditions, a nd 15% on the oscilla t o r frequency. t he ou tput ve rsion include d fixe d 3 . 3v , 5v, 12v, an d an adjus ta ble type . th e packages are availab l e in a standard 5-lead to-2 20 package 5-lead to2 52 package and a 5 - lead to-263 package. applications simple high-efficiency step-down regulator on-card switching regulators positive to negative converter metal tab gnd 1 vin 2 output 3 gnd 4 fb 5 sd sd fb 4 gn d ou t p u t vin 1 2 3 5 meta l t ab gn d 1 2 ou 3 4 5 vin t p u t gn d fb sd met a l ta b gn d
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev1.5 2/12 block diagram s our c e f r equenc y + - co mp c u r r ent li m i t 1. 235 v 5 up 3 sd re g u la t o r osc . st a r t - + am p + - co m p 4 - + co mp sw i t c h fb 3a 150 kh z 200 m v t her m a l 220 m v 2. 5v 1 pr e- dr i v er 2 re f e r e n c e ou t p u t bi as vi n co m p e n s a t i o n gn d absolute maximum ratings sy m b o l p a r a m r t e r r a t i n g u n i t v cc supply voltage +45 v v sd on/off pin input voltage -0.3 to +25 v v fb feedback pin voltage -0.3 to +25 v v out output voltage to ground -1 v p d power dissipation internally limited w t st storage temperature -65 to +150
t op operating temperature -40 to +125
v op operating voltage +4.5 to +40 v
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev1.5 3/12 electrical characteristics (all output voltage versions) unless otherwise specified, v in =12v for 3.3v,5v, adjustable version and v in =24v for the 12v version. i load =0.5a symbol paramrter conditions min. typ. max. unit 50 i b feedback bias current v fb =1.3v(adjustable version only) 40 100 na 127 150 173 f osc oscillator frequency 110 173 khz v sat saturation voltage i out =3a no outside circuit v fb =0v force driver on 1.16 1.4 v max.duty cycle(on) v fb =0v force driver on 100 dc min.duty cycle(off) v fb =12v force driver off 0 % i cl current limit peak current no outside circuit v fb =0v force driver on 3.6 6.9 a output=0 no outside circuit v fb =12v force driver off 50 a i l output=-1 output leakage current v in =40v 5 30 ma i q quiescent current v fb =12v force driver off 7.8 10 ma i stby standby quiesient current on/off pin=5v v in =12v 85 200 a v il low(regultaor on) 0.6 v ih on/off pin logic input threshold voltage high(regultaor off) 2.0 1.4 v i h on/off pin logic input current v logic =2.5v(off) 6 15 i l on/off pin input current v logic =0.5v(on) 0.02 5 a to252-5l 10 to220-5l 2.5 jc thermal resistence to263-5l junction to case 3.5 /w
to252-5l 30 to220-5l 28 ja thermal resistence with copper area of approximately 3 in 2 to263-5l junction to ambient 30 /w

liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev1.5 4/12 electrical characteristics (continued) symbol parameter conditions typ. limit unit v fb output feedback 4.5v v in 40v 0.2a i load 3a v out programmed for 3v 1.23 1.193/ 1.18 1.267/ 1.28 v v min v max lsp3122-adj efficiency v in =12v, i load =3a 72 % v out output voltage 5v v in 40v 0.2a i load 3a 3.3 3.168/ 3.135 3.432/ 3.465 v v min v max lsp3122-3.3v efficiency v in =12v, i load =3a 72 % v out output voltage 7v v in 40v 0.2a i load 3a 5 4.8/ 4.75 5.2/ 5.25 v v min v max lsp3122-5v efficiency v in =12v, i load =3a 79 % v out output voltage 15v v in 40v 0.2a i load 3a 12 11.52/ 11.4 12.48/ 12.6 v v min v max lsp3122-12v efficiency v in =15v, i load =3a 90 % specifications with boldface type are for full operating temperature range, the other type are for tj=25 o c.
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter 5/12 typical performance characteristics 0. 6 0 0. 80 1. 00 1. 2 0 1. 40 1. 60 0. 5 1 2 3 s w i t ch curre nt ( a ) 1 2 3 sat urat ion voltag e(v) 1: - 4 0 2: 25 3 : 1 2 5 sw i t c h sa t u r a t i o n vo l t a g e v in =12 v -1 .5 -1 . 0 -0 .5 0 0. 5 -50 -2 5 0 2 5 50 75 10 0 125 v in =20v i load =3a no rma lix ed at t j =2 5 junction temperature ( ) outpu t voltage c h ange ( % ) normaliz ed o u tput voltage 1. 0 1. 5 0.6 0. 8 1. 0 1.2 1. 4 -50 - 2 5 0 25 50 7 5 10 0 12 5 jun c tion temperature ( ) input- outp u t differen t ial (v) dropout vo ltage 1.6 1.8 i load =1a i lo a d =3 a l= 33 h r in d =0 .04o v ou t =v reg -50 m v 130 135 140 145 150 -50 -25 0 25 5 0 75 10 0 12 5 jun c tion temperature ( ) sw itch ing f r eque ncy 15 5 16 0 fr equency (khz) -50 - 25 0 2 5 5 0 7 5 100 12 5 3.50 4.00 4.50 5.0 0 5.5 0 v in =12v vout=5v swit ch c u rre n t limit ( a) switch cur r ent lim i t junctio n temperatu r e ( ) -5 0 - 25 0 2 5 5 0 7 5 1 0 0 125 0. 0 0. 5 1. 0 1. 5 2. 0 2. 5 on/off threshold v o ltag e t h r e sh ol d v o l t ag e( v) junctio n te mpera t u r e ( ) off on rev1.5
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev 1 .5 6/12 typical application circuits (1) fixed output circuit lsp 3 122 - 3 3 v in fb ou t p u t sd g n d 33 uh c in 47 0 u f l1 c ou t 22 0 u f v in 53 2 4 d1 s c hot t k y d i od e 5a / 4 0v 1 v ou t = 3. 3v / 3 a (2) adjustable output circuit vout=v fb *(1+r1/r2); v fb = 1 .23v; r2= 1 k typic a l rem a rk : for input-output voltages greater than approximately 35v(ex:vin=40v,v out<=5v), the additional capacitor cff 10nf is recommended between fb and vout. the capac itor type can be ceramic, plastic, etc. function description pin func tion v in t h is is th e pos itive inpu t su pp ly for th e ic sw itch ing r egu la tor . a su ita b le inpu t b y pass ca pac itor mus t be p r e s e n t at this pin to minimiz e voltage trans ients and t o supply t he swit ching current s needed by t he regulator. ground circuit ground. output interna l switch. the voltage a t th is p i n switches between ( v in ? v sa t ) and approxima t ely ? 0.5 v , with a du ty cycle of app roxima tely v out / v in . t o minimize coupling to sensitiv e circuitry, the pc board copper are a connected to this pin should be kept a minimum.
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev1.5 7/12 feedback senses the regulated output voltage to complete the feedback loop. on/off allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 150ua. pulling this pin below a threshold voltage of approximately 1.3v turns the regulator on, and pulling this pin above 1.3v (up to a maximum of 25v) shuts the regulator down. if this shutdown feature is not needed, the on/off pin can be wired to the ground pin or it can be left open, in either case the regulator will be in the on condition. thermal considerations the lsp3122 is available in three packages, a 5-pin to-220, 5-pin to252 and a 5-pin surface mount to-263. the to-220 package needs a heat sink under most conditions. the size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. the lsp3122 junction temperature rises above ambient temperature for a 3a load and different input and output voltages. the data for these curves was taken with the lsp3122 (to-220 package) operating as a buck switching regulator in an ambient temperature of 25 o c (still air). these temperature rise numbers are all approximate and there are many factors that can affect these temperatures. higher ambi ent temperatures require more heat sinking. the to-263 surface mount package tab is designed to be soldered to the copper on a printed circuit board. the copper and the board are the heat sink for this package and the other heat producing components, such as the catch diode and inductor. the pc board copper area that the package is soldered to should be at least 0.4 in 2 , and ideally should have 2 or more square inches of 2 oz. additional copper area improves the thermal characteristics, but with copper areas greater than approximately 6 in 2 , only small improvements in heat dissipation are realized. if further thermal improvemen ts are needed, double sided, multilayer pc board with large copper areas and/or airflow are recommended. the lsp3122 (to-263 package) junction temperature rise above ambient temperature with a 2a load for various input and output voltages. this data was taken with the circuit operating as a buck switching regulator with all components mounted on a pc board to simulate the junction temperature under actual operating conditions. this curve can be used for a quick check fo r the approximate junction temperature for various conditions, but be aware that there are many factors that can affect the junction temperature. when load currents higher than 2a are used, double sided or multilayer pc boards with large copper areas and/or airflow might be needed, especially for high ambient temperatures and high output voltages. for the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (once exception to this is the output (switch) pin, which should not have large areas of copper.) large areas of copper provide the best transfer of hea t (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. some of thes e factors include board size, shape, thickness, position, location, and even board temperature. other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multilayer board and the amount of solder on the board. the effectiveness of the pc board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. furthermore, some of these components such as the catch diode will add heat to the pc board and the heat can vary as the input voltage changes. for the inductor, depending on the physical size, type of core ma terial and the dc resistance, it could either act as a heat sink taking heat away from the boar d, or it could add heat to the board.
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev 1 .5 8/12 ordering information
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev 1 .5 9/12 marking information to220-5l ls p3122 vyywwuz lsc logo p a rt id 12 3 4 5 v yyww uz internal code da te code yy j yea r (09 = 20 09,10 = 2 010,1 1 =2011,1 2 =2012. .. ) ww j week(01~53) output voltage x = 1 2 v,w=5.0v ,j=3.3 v,b l ank=adj ( 2) to263-5l lsp3 122 v yywwuz part id lsc logo 12 3 45 v yyww uz internal code da te code yy j yea r (09 = 20 09,10 = 2 010,1 1 =2011,1 2 =2012. .. ) ww j week(01~53) output voltage x = 1 2 v,w=5.0v ,j=3.3 v,b l ank=adj (3) to252-5l lsc lsc3122 vyywwuz logo p a rt id 12 3 4 5 v yyww uz internal code da te code yy j yea r (09 = 20 09,10 = 2 010,1 1 =2011,1 2 =2012. . . ) ww j week(01~53) output voltage x = 1 2 v,w=5.0v ,j=3.3 v,b l ank=adj
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev 1 .5 10/12 package information (1) to220-5l a f c j1 e1 l d q e h1 e b p dimensions in millimeters dimensions in inches sy mbol m i n . n o m . m a x . m i n . n o m . m a x . a 4 . 0 7 4 . 4 5 4 . 8 2 0 . 1 6 0 0 . 1 7 5 0 . 1 9 0 b 0 . 7 6 0 . 8 9 1 . 0 2 0 . 0 3 0 0 . 0 3 5 0 . 0 4 0 c 0 . 3 6 0 . 5 0 0 . 6 4 0 . 0 1 4 0 . 0 2 0 0 . 0 2 5 d 1 4 . 2 2 1 4 . 8 6 1 5 . 5 0 0 . 5 6 0 0 . 5 8 5 0 . 6 1 0 e 9 . 7 8 1 0 . 1 6 1 0 . 5 4 0 . 3 8 5 0 . 4 0 0 0 . 4 1 5 e 1 . 5 7 1 . 7 1 1 . 8 5 0 . 0 6 2 0 . 0 6 7 0 . 0 7 3 e 1 6 . 6 8 6 . 8 1 6 . 9 3 0 . 2 6 3 0 . 2 6 8 0 . 2 7 3 f 1 . 1 4 1 . 2 7 1 . 4 0 0 . 0 4 5 0 . 0 5 0 0 . 0 5 5 h 1 5 . 4 6 6 . 1 6 6 . 8 6 0 . 2 1 5 0 . 2 4 3 0 . 2 7 0 j 1 2 . 2 9 2 . 7 4 3 . 1 8 0 . 0 9 0 0 . 1 0 8 0 . 1 2 5 l 1 3 . 2 1 1 3 . 9 7 1 4 . 7 3 0 . 5 2 0 0 . 5 5 0 0 . 5 8 0 p 3 . 6 8 3 . 8 1 3 . 9 4 0 . 1 4 5 0 . 1 5 0 0 . 1 5 5 q 2 . 5 4 2 . 7 3 2 . 9 2 0 . 1 0 0 0 . 1 0 7 0 . 1 1 5
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev 1 .5 11/12 (2) to263-5l e b e d l2 l 9. 1 0 land p a t t e r n r e comm endat i o n (uni t : mm) 10 . 9 0 15 . 7 0 2. 50 1. 70 1. 00 l1 c c2 a dimensions in millimeters dimensions in inches sy mbol m i n . n o m . m a x . m i n . n o m . m a x . a 4 . 0 7 4 . 4 6 4 . 8 5 0 . 1 6 3 0 . 1 7 6 0 . 1 9 4 b 0 . 5 1 0 . 8 4 1 . 0 2 0 . 0 2 0 0 . 0 3 3 0 . 0 4 1 c 0 . 3 6 0 . 5 0 0 . 7 4 0 . 0 1 4 0 . 0 2 0 0 . 0 3 0 c 2 1 . 1 4 1 . 2 7 1 . 6 5 0 . 0 4 6 0 . 0 5 0 0 . 0 6 6 d 8 . 2 0 9 . 1 5 9 . 6 5 0 . 3 2 8 0 . 3 6 0 0 . 3 8 0 e 9 . 6 5 1 0 . 1 6 1 0 . 6 7 0 . 3 8 6 0 . 4 0 0 0 . 4 2 7 e 1 . 5 7 1 . 7 1 1 . 8 5 0 . 0 6 3 0 . 0 6 8 0 . 0 7 4 l 1 4 . 4 5 1 5 . 2 4 1 5 . 8 8 0 . 5 7 8 0 . 6 0 0 0 . 6 3 5 l 1 1 . 7 8 2 . 5 4 2 . 7 9 0 . 0 7 1 0 . 1 0 0 0 . 1 1 0 l 2 2 . 9 2 0 . 1 1 5
liteon semiconductor corporation lsp3122 150khz 3a pwm buck dc/dc converter rev1.5 12/12 (3) to252-5l c1 a e l3 c l2 a1 d1 d e e1 b l1 v dimensions in millimeters dimensions in inches sy mbol m i n . m a x . m i n . m a x . a 2 . 2 0 0 2 . 4 0 0 0 . 0 8 7 0 . 0 9 4 a 1 0 . 0 0 0 0 . 1 2 7 0 . 0 0 0 0 . 0 0 5 b 0 . 4 0 0 0 . 6 0 0 0 . 0 1 6 0 . 0 2 4 c 0 . 4 3 0 0 . 5 8 0 0 . 0 1 7 0 . 0 2 3 c 1 0 . 4 3 0 0 . 5 8 0 0 . 0 1 7 0 . 0 2 3 d 6 . 3 5 0 6 . 6 5 0 0 . 2 5 0 0 . 2 6 2 d 1 5 . 2 0 0 5 . 4 0 0 0 . 2 0 5 0 . 2 1 3 e 5 . 4 0 0 5 . 7 0 0 0 . 2 1 3 0 . 2 2 4 e 1 . 2 7 0 t y p . 0 . 0 5 0 t y p . e 1 2 . 5 4 0 t y p . 1 . 0 0 0 t y p . l 1 9 . 5 0 0 9 . 9 0 0 0 . 3 7 4 0 . 3 9 0 l 2 1 . 4 0 0 1 . 7 8 0 0 . 0 5 5 0 . 0 7 0 l 3 2 . 5 5 0 2 . 9 0 0 0 . 1 0 0 0 . 1 1 4 v 3 . 8 0 0 r e f 0 . 1 5 0 r e f

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