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cm2593/p 2a step down vo ltage regulator general description features the cm2593/p is a monolithic integrated circuit that provide all the active functions for a step-down switching regulator, capable of driving a 2a load without additional transistor component. requiring a minimum number of external component, the board space can be saved easily. the external shutdown function can be controlled by ttl logic level and then come into standby mode. the internal compensation makes feedback control have good line and load regulation without external design. regarding protected function, thermal shutdown is to prevent over temperature operating from damage, and current limit is against over current operating of the output switch. the cm2593/p operates at a switching frequency of 150khz thus allowing smaller sized filter components than what would be needed with lower frequency swit ching regulators. other features include a guaranteed + 4% tolerance on output voltage under specified input voltage and output load conditions, and + 15% on the oscillator frequency. the output version included fixed 3.3v, 5v, and an adjustable type. the packages are available in a standard 8-lead sop8. 3.3v, 5v and adjustable output versions adjustable version output voltage range, 1.23v to 37v + 4% max over line and load condition sop-8l packages voltage mode non-synchronous pwm control thermal-shutdown an d current-limit protection on/off shutdown control input input voltage range up to 40v output load current: 2a 150 khz fixed frequency internal oscillator low power standby mode built-in switching transistor on chip applications ? simple high-efficiency step-down(buck) regulator ? efficient pre-regulator for linear regulators ? on-card switching regulators ? battery / car charger ? positive to negative converter ? digital still and video cameras typical applications figure 1. basic application circuit with cm2593/p fixed version 2007/01/25 rev. 1.4 champion microelectronic corporation page 1
cm2593/p 2a step down vo ltage regulator pin configuration sop08 top view(cm2593) sop08 top view(cm2593p) block diagram 2007/01/25 rev. 1.4 champion microelectronic corporation page 2
cm2593/p 2a step down vo ltage regulator pin description pin no. symbol description 1 v in operating voltage input 2 out switching output 3 fb output voltage feedback control 4 sd on/off shutdown 5-8 gnd ground pin ordering information cm2593/p x x x lead free output voltage package type s: sop-o8 package blank: normal g: lead free package c: adjustable sc: 3.3v zjc: 5v absolute maximum ratings symbol parameter rating unit 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 o c t op operating temperature -40 to +125 o c v op operating voltage +4.5 to +45 v ja thermal resistance 75 /w jc thermal resistance 14 /w 2007/01/25 rev. 1.4 champion microelectronic corporation page 3
cm2593/p 2a step down vo ltage regulator 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 = 0.2a symbol parameter conditions min. typ. max. unit -50 i b b feedback bias current v fb =1.3v (adjustable version only) -10 -100 na t j =25 127 150 173 f osc oscillator frequency -40 <=t j <=125 110 150 173 khz fscp oscillator frequency of short circuit protect when current limit occurred and v fb <0.55v 30 60 khz 1.4 v sat saturation voltage i out =1.5a no outside circuit v fb =0v force driver on 1.15 1.5 v max. duty cycle(on) v fb =0v force driver on 100 dc min. duty cycle(off) v fb =12v force driver off 0 % 3.3 i cl current limit peak current no outside circuit v fb =0 force driver on 2.4 2.8 3.6 a output = 0 no outside circuit v fb =12 force driver off -200 ua i l output = 1 output leakage current v in =24v -5 ma i q quiescent current v fb =12 force driver off 5 10 ma 150 i stby standby quiescent current on/off pin=5v v in =24v 70 200 ua v il low (regulator on) - 0.6 v ih on/off pin logic input threshold voltage high (regulator off) 2.0 1.3 - v i h on/off pin logic input current v logic =2.5v (off) -0.01 i l on/off pin input current v logic =0.5v (on) -0.1 -1 ua tj increasing 175 ts over temperature shutdown threshold tj decreasing 150 o c 2007/01/25 rev. 1.4 champion microelectronic corporation page 4
cm2593/p 2a step down vo ltage regulator symbol parameter conditions typ. limit unit fb v output feedback 5v < v in < 40v 0.2a < i load < 2a v out programmed for 3v 1.235 1.193/1.18 1.267/1.28 v v min v max cm2593/p-adj efficiency v in = 12v, i load =2a 75 % out v output voltage 5.5v < v in < 40v 0.2a < i load < 2a 3.3 3.168/3.135 3.432/3.465 v v min v max cm2593/p-3.3v efficiency v in = 12v, i load =2a 75 % out v output voltage 8v < v in < 40v 0.2a < i load < 2a 5 4.8/4.75 5.2/5.25 v v min v max cm2593/p-5v efficiency v in = 12v, i load =2a 80 % specifications with boldface type are for full operating temperature range, the other type are for t j =25oc. 2007/01/25 rev. 1.4 champion microelectronic corporation page 5
cm2593/p 2a step down vo ltage regulator functional description pin functions +v in this is the positive input supply for the ic switching regulator. a suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching curr ents needed by the regulator. out internal switch and power output. the voltage at this pin switches between (+v in ? v sat ) and approximately ? 0.5v, with a duty cycle of approximately v out / v in . the pc board copper area connected to this pin should be kept a minimum in order to reduce the coupling sensitivity to the circuitry ground circuit ground. feedback complete the feedback loop by sensing the regulated output voltage on /off allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 100ua. 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 sop-8 package needs a heat sink under most conditions . the size of the heat-sink depends on the input voltage, the output volt age, the load current and the ambient temperature. the cm2593/p junction temperature rises above ambi ent temperature for a 2a load and different input and output voltages. the data for these curves was taken with the cm2593/p (sop-8 package) operating as a buck switching regulator in an ambient temperature of 25 o c (still air). these temperature increments are all approximat e and are affected by many factors. some of these fa ctors include board size, shape ,thickness ,position ,location, and even board temperature. other factors ar e trace width, total printed circuit copper area, copper thickness , single or double-sided, multi-layer board and amount of solder on the board. higher ambient temperatures require more heat sinking. for the best thermal performance ,wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (one exception is the out(switch) pin, which should not have large areas of copper.) large areas of copper provide the best transfer of heat(lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. 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 heat can vary as the input voltage changes. for the inductor, depending on the physical size, type of core material and the dc resistance, it could either act as a heat sink taki ng heat away from the board, or it could add heat to the board. 2007/01/25 rev. 1.4 champion microelectronic corporation page 6
cm2593/p 2a step down vo ltage regulator applications circuit cm2593/p 2 1 3 4 5 6 7 8 out vin fb sd gnd gnd gnd gnd l1 68uf 1 2 5a/40v 1 2 r1 2 1 470uf/50v 1 2 vfb = 1.235v ; r1=1k~5k 220uf/25v 1 2 output voltage fixed : r1=nc , r2=0 vout output voltage adj : vo=vref*(1+(r2/r1)) vin r2 2 1 applications demo board layout top layer bot layer notice : 1. r1/r2 must be close to pin3 (vfb ), but keep feedback wiring away from inductor . 2. inductor/diode must be close to pin2 (vout ), heavy lines mu st be keep short and thick . 3. please to refer to circuit and demo board layout (the fig. as above) 2007/01/25 rev. 1.4 champion microelectronic corporation page 7
cm2593/p 2a step down vo ltage regulator different heatsink area thermal resistance vs. different cooper area layout design dog-bone layout minimum footprint , ja = 75 /w copper area = 10mm 2 , ja = 64 /w copper area = 30mm 2 , ja = 54 /w copper area = 50mm 2 , ja = 51 /w copper area = 70mm 2 , ja = 49 /w 2007/01/25 rev. 1.4 champion microelectronic corporation page 8
cm2593/p 2a step down vo ltage regulator typical performance characteristics (test figure 1 above unless otherwise specified) typical performance characteristics norm alized output voltage 4.90 4.95 5.00 5.05 5.10 -50 -25 0 25 50 75 100 125 output voltage change v in =20v, i load =2a normalized at t j =25 o c junction temperature( o c) junction temperature( o c) efficiency (%) efficiency 70 75 80 85 90 95 810152025 30 35 40 5v 3.3v 2a load 1.2 1.3 1.4 1.5 1.6 1.7 2.0 3 45 switch current(a) saturation voltage (v) 1 2 3 1 : -40 o c 2 : 25 o c 3 : 125 o c switch saturation voltage output current io (a) output voltage vo(v) switch current limit 0.0 2.0 4.0 6.0 8.0 01234567 =10v v in 20v 30v 0.0 5.0 10.0 15.0 20.0 25.0 -50 -25 0 25 50 75 100 125 junction temperature( o c) supply current (ma) operating quiescent current switch on switch off supply volotage (v) current (ua) 0.0 40.0 80.0 100.0 130.0 200.0 shutdown quiescent current 10 20 30 40 v on/off =5 v 1 : -40 o c 2 : 25 o c 3 : 125 o c 1 3 2 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 125 junction temperature ( o c) supply voltage (v) minimum operating supply voltage v out =1.23v i load =120ma junction temperature ( o c) threshold voltage (v) on/off threshold voltage 0.0 1.0 2.0 3.0 4.0 5.0 -50 -25 0 25 50 75 100 125 1.4 5 10 15 20 22 23 24 25 on/off pin voltage (v) on/off pin current (sinking) v in =40v -40 o c t j 125 o c 2007/01/25 rev. 1.4 champion microelectronic corporation page 9
cm2593/p 2a step down vo ltage regulator switch frequency junction temperature ( o c) frequency (khz) 100 150 200 -50 -25 0 25 50 75 100 125 50 0.0 junction temperature( o c) bias current (na) feedback pin bias current 0.0 10.0 20.0 30.0 40.0 50.0 -50 -25 0 25 50 75 100 125 adjustable version only thermal protection 0 2 4 6 8 10 junction temperature( 50 75 100 125 150 175 200 o c) output voltage vo(v) light load operation 0.2m s/div v in=12v v out=5v iload=0a v o ut ripple 0 mv /div iout heavy load operation vi n=12v vout=5v iload=2a 5us/div vout ripple 20mv/div iout load step v in=12v v out=5v i lo ad =0a to 2a 0.5m s v out 50m v /d iv i load 1a /d iv 2007/01/25 rev. 1.4 champion microelectronic corporation page 10
cm2593/p 2a step down vo ltage regulator package dimension 8-pin sop (s08) pin 1 id 8-pin sop w/ power pad (ps08) 2007/01/25 rev. 1.4 champion microelectronic corporation page 11
cm2593/p 2a step down vo ltage regulator importnt notice champion microelectronic corporation (cmc) reserves the ri ght to make changes to its products or to discontinue any integrated circuit product or serv ice 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. a few applications using integrated circuit products may invo lve potential risks of death, personal injury, or severe property or environmental damage. cmc integrated circ uit products are not designed, intended, authorized, or warranted to be suitable for use in life-support applications, devices or systems or other critical applications. use of cmc products in such applications is understood to be fully at the risk of the customer. in order to minimize risks associated with the customer?s applicat ions, the customer should provide adequa te design and operating safeguards. hsinchu headquarter sales & marketing 5f, no. 11, park avenue ii, science-based industrial park, hsinchu city, taiwan 300 7f-6, no.32, sec. 1, chenggong rd., nangang district, taipei city 115, taiwan r.o.c. t e l : +886-3-567 9979 t e l : +886-2-2788 0558 f a x : +886-3-567 9909 f a x : +886-2-2788 2985 http://www.champion-micro.com 2007/01/25 rev. 1.4 champion microelectronic corporation page 12

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