ACE1085 3A Low Dropout Linear Regulator Technology 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 Input voltage Junction temperature Environment Temperature Storage temperature VIN TJ TA TS Max Unit 18 V O 150 C O 140 C - 65 to 150 OC Packaging Type TO-220 TO-263-3L 1 1 2 2 3 TO-263-2L 1 2 3 TO-252 1 2 3 3 VER 1.2 1 Technology Fixed Version Pin Symbol Definition 1 GND Ground 2 Vout Output 3 Vin Input ACE1085 3A Low Dropout Linear Regulator Adjustable Version Pin Symbol Definition 1 ADJ Adjustable 2 Vout Output 3 Vin Input Ordering information Selection Guide ACE1085 XX XX + H Halogen - free Pb - free 1WM : TO-263-2 2WM : TO-263-3L YM : TO-252 ZM : TO-220 Output Voltage : 1.8V / 2.5V ….. 5.0V / Default: Adjustable Version Block Diagram Recommended Work Conditions Item Min Nom Max Unit Input Voltage Range 18 V Environment Temperature -50 140 ℃ VER 1.2 2 ACE1085 3A Low Dropout Linear Regulator Technology 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 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 Output Voltage Line Regulation (Note1) Load Regulation (Note1,2) Dropout Voltage (Note3) Vout ΔVout ΔVout Vin-Vout Current Limit Minimum Load Current (Note4) Quiescent Current Adjust Pin Current (Adjustable Version) Adjust Pin Current Change Temperature Stability 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 ACE1085-5.0V, Vin-Vout=3V, 0≤Iout≤3A 3 15 mV ΔVout, ΔVref =1%，Iout=3A 1.3 1.5 V Vin-Vout=3V, Tj=25℃ llimit 3.2 4.5 A ACE1085-ADJ 3 10 mV Iq Vin=10V 4 10 mV IAdj Vin=4.25V,Iout=10mA 45 110 uA Ripple Rejection F=120Hz,Cout=25uF( tan),Iout=3A,Vin-Vout=3V Ichange 10mA≤Iout≤3A, 1.5V≤Vin-Vout ≤6V Iout=10mA, Vin-Vout=1.5V dB 0.2 5 uA 0.5 % VER 1.2 3 3A Low Dropout Linear Regulator Technology Thermal Resistance junction to case TO-252 TO-263 TO-220 θJC ACE1085 12.5 3 3 ℃ /W Note1:The Parameters of Line Regulation and Load Regulation in Table1 are tested under constant 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 decrease Vin(Vin2) until Vout value is equal to 99%*Vout1(Vout2). Vdropout=Vin2-Vout2. Note4:Minimum Load Current is defined as the minimum output current required to maintain regulation. When 1.5V≦Vin-Vout≦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 Vin Vout Vout ADJ R1 125 ohm 10uF Tan 22uF Tan R2 Vout=Vref * (1+R2/R1)+Iadj * R2 VER 1.2 4 Technology ACE1085 3A Low Dropout Linear Regulator 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 amplified 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 120Ω~200Ω,the value of CAdj should satisfy this equation: 2*Fripple*CAdj<R1. Recommend using 10uF tan capacitor. Output Voltage of Adjustable Version The ACE1085 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 120Ω～200Ω 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. VER 1.2 5 Technology ACE1085 3A Low Dropout Linear Regulator Typical Performance Characteristic Dropout Voltage VS. Output Current Iout (A) Reference Voltage VS. Thermal Protection T (℃) Load Transient Response Reference Voltage VS. Temperature T (℃) Output Voltage VS. Output Current Iout (A) Line Transient Response VER 1.2 6 Technology ACE1085 3A Low Dropout Linear Regulator Packing Information TO-252 VER 1.2 7 Technology ACE1085 3A Low Dropout Linear Regulator Packing Information TO-220 VER 1.2 8 Technology ACE1085 3A Low Dropout Linear Regulator Packing Information TO-263-2L VER 1.2 9 Technology ACE1085 3A Low Dropout Linear Regulator Packing Information TO-263-3L VER 1.2 10 Technology ACE1085 3A Low Dropout Linear Regulator Notes ACE does not assume any responsibility for use as critical 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/ VER 1.2 11