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? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 1 ? description ACE1085 is a series of low dropout three terminal regulators with a dropout of 1.3v at 3a load current. other than a fixed version (vout 1.8v,2.5v,3.3v,5.0v , ACE1085 has an adjustable version, the adjustable version can set the output voltage with two external resistors. ACE1085 offers thermal shut down and current limit functions, to assure the stability of chip and power system. and it uses trimming technique to guarantee output voltage accuracy within 2 . the ACE1085 series is available in standard packages of to-263-2l, to-263-3l, to-220 and to-252. features other than a fixed version and an adjustable version, output value can be customized on command. maximum output current is 3a output voltage accuracy is within 2 1 customized range of operation input voltage: max 18v line regulation: 0.2 (typical) load regulation: 0.2 (typical) environment temperature: -50 ~140 application power management for computer mother board, graphic card battery charger post regulators for switching supplies microprocessor supply absolute maximum ratings parameter symbol max unit input voltage v in 18 v junction temperature t j 150 o c environment temperature t a 140 o c storage temperature t s - 65 to 150 o c packaging type to-220 to-263-3l to-263-2l to-252 1 2 3 1 2 3 1 2 3 1 2 3
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 2 fixed version adjustable version pin symbol definition 1 gnd ground 2 vout output 3 vin input ordering information selection guide ACE1085 xx xx + h block diagram recommended work conditions item min nom max unit input voltage range 18 v environment temperature -50 140 pin symbol definition 1 adj a djustable 2 vout output 3 vin input halogen - free output voltage : 1.8v / 2.5v ?.. 5.0v / default: adjustable version pb - free 1wm : to-263-2 2wm : to-263-3l ym : to-252 zm : to-220
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 3 electrical characteristics tj=25 parameter symbol test conditions min typ mum unit reference voltage vref iout=10ma,vin-vout=3v, 10ma iout 3a ,1.5v vin-vout 5v 1.238 1.225 1.25 1.25 1.262 1.275 v ACE1085-1.80v, iout=0ma,vin=4.8v,tj=25 10ma iout 3a ,3.4v vin 7v 1.782 1.764 1.80 1.80 1.818 1.836 v ACE1085-2.50v, iout=0ma,vin=4.8v,tj=25 10ma iout 3a ,4.1v vin 7v 2.475 2.45 2.50 2.50 2.525 2.55 v ACE1085-3.3v,iout=0ma,vin=6.3v,tj=25 10ma iout 3a ,4.9v vin 8v 3.267 3.234 3.3 3.3 3.333 3.366 v output voltage vout ACE1085-5.0v, iout=0ma,vin=8.0v,tj=25 10ma iout 3a ,6.6v vin 10v 4.95 4.90 5.0 5.0 5.05 5.10 v ACE1085-adj,iout=10ma , 2.85v vin 10v 0.035 0.2 mv ACE1085-1.8v, iout=10ma, 3.4v vin 10v 1 5 mv ? ACE1085-2.5v, iout=10ma, 4.1v vin 10v 1 5 mv ? ACE1085-3.3v, iout=10ma, 4.9v vin 10v 1 5 mv ? line regulation (note1) vout ACE1085-5.0v, iout=10ma, 6.6v vin 10v 1 5 mv ? ACE1085-adj, vin-vout=3v, 10ma iout 3a 0.2 0.4 % ACE1085-1.8v, vin-vout=3v, 0 iout 3a 3 15 mv ? ACE1085-2.5v, vin-vout=3v, 0 iout 3a 3 15 mv ? ACE1085-3.3v, vin-vout=3v, 0 iout 3a 3 15 mv ? load regulation (note1,2) vout ACE1085-5.0v, vin-vout=3v, 0 iout 3a 3 15 mv ? dropout voltage (note3) vin-vout vout, vref =1% iout=3a 1.3 1.5 v current limit vin-vout=3v, tj=25 3.2 4.5 a minimum load current (note4) llimit ACE1085-adj 3 10 mv quiescent current iq vin=10v 4 10 mv adjust pin current (adjustable version) iadj vin=4.25v,iout=10ma 45 110 ua ripple rejection f=120hz,cout=25uf( tan),iout =3a,vin-vout=3v db adjust pin current change ichange 10ma iout 3a, 1.5v vin-vout 6v 0.2 5 ua temperature stability iout=10ma, vin-vout=1.5v 0.5 %
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 4 thermal resistance junction to case jc to-252 to-263 to-220 12.5 3 3 /w note1:the parameters of line regulation and load regulation in table1 are tested under cons tant junction temperature. note2:when iout varies between 0~3a,vin-vout varies between 1. 5v~6v under constant junction temperature, the parameter is satisfied the criterion in table. if temperature varies between -50 ta 140 it needs output current to be larger than 10ma to satisfy the criterion. note3:dropout voltage is tested under iout =3a and the following testing conditions : first step is to find out the vout value(vout1) when vin1=vout+1.5v, second step is to decreas e vin(vin2) until vout value is equal to 99%*vout1(vout2). vdropout=vin2-vout2. note4:minimum load current is defined as the minimum ou tput current required to maintain regulation. when 1.5v Q vin-vout Q 6v the device is guaranteed to regulate if the output current is greater than 10ma. detailed description ACE1085 is a series of low dropout voltage, three terminal regulators. its application circuit is very simple: the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to work. it is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, current limit, power transistors and its driver circuit and so on. the thermal shut down and current limit modules can assure chip and its application system working safety when the environment temperature is larger than 140 or output current is larger than 3.2a. the bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design considerations. the temperature coefficient is under 100ppm/ .and the accuracy of output voltage is guaranteed by trimming technique. typical application circuit ACE1085 has an adjustable version and fixed versions, chart 1 is its typical application. vin ACE1085 vout vin vout adj r1 125 ohm 10uf 22uf tan tan r2 vout=vref * (1+r2/r1)+iadj * r2
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 5 ACE1085 typical application of ACE1085 application hints 1. recommend using 10uf tan capacitor as bypass capacitor for all application circuit. 2. recommend using 22uf tan capacitor to assure circuit stability. 3. using a bypass capacitor(cadj) between the adjust terminal and ground can improve ripple rejection, this bypass capacitor prevents ripple from being amp lified as the output voltage is increased. the impedance of cadj should be less than the resistor?s(r1) which is between output and adjust pins to prevent ripple from being amplified at any ripple frequency. as r1 is normally in the range of 120 ? ~200 ? ,the value of cadj should satisfy this equation: 2*fripple*cadjACE1085 adjustable version provide 1.25v reference voltage. any output voltage between 1.25v~13.8v can be available by choosing two external resistors (connection method is shown in chart 1). in chart 1, r1,r2 is the two external resistors. explanation the output voltage of adjustable version satisfies this followed equation: vout=vref*(1+r2/r1)+iadj*r2. we can ignore iadj because iadj(about 50ua) is much less than the current of r1(about 4ma). how to choose r1 the value of r1 should be in the range of 120 ? 200 ? to assure chip working normally without any load. to assure the electrical performance showed in table 1, the output current should be larger than 5ma. if r1 is too large, the minimum output current should be larger than 4ma , the best working condition is to assure that the output current exceeds 10ma.
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 6 typical performance characteristic dropout voltage vs. output current reference voltage vs. temperature iout (a) t ( ) reference voltage vs. thermal protection output voltage vs. output current t ( ) iout (a) load transient response line transient response ? ? ?
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 7 packing information to-252
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 8 packing information to-220
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 9 packing information to-263-2l
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 10 packing information to-263-3l
? ??????????????????????????????????????????????????????????????? ??????????????????????? ACE1085 ??????????????????????? technology 3a low dropout linear regulator ver 1.2 11 notes ace does not assume any responsibility for use as cr itical components 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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