BL1085-CY

BL1085 3A Bipolar Linear Regulator DESCRIPTION FEATURES  BL1085 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 ） , BL1085 has an adjustable version, The adjustable version can set the output voltage with two external resistors.    BL1085 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％. 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％ Range of operation input voltage: Max 15V Line regulation: 0.2％ (Typical) Load regulation: 0.2％ (Typical) Environment Temperature: -40℃~85℃ APPLICATIONS  BL1085 series is available in standard packages of TO-263-2L, TO-263-3L, TO-220 and TO-252    TYPICAL APPLICATION Power Management for Computer Mother Board, Graphic Card Battery Charger Post Regulators for Switching Supplies Microprocessor Supply ELECTRICAL CHARACTERISTICS BL1085 Dropout Voltage VS. Output Current Dropout Voltage(V) 1.350 Application circuit of BL1085 fixed version 1.300 1.250 1.200 1.150 1.100 1.050 NOTE: Input capacitor (Cin=10uF) and Output capacitor (Cout=22uF) are recommended in all application circuit. Tantalum capacitor is recommended. www.belling.com.cn 0 0.5 1 1.5 Iout(A) 1 2 2.5 3 BL1085 ORDERING INFORMATION BL1085 □ 1□ 2□ 3 Code 1 □ 2 □ 3 □ PIN CONFIGURATION Description Output voltage: e.g. 18=1.8V 33=3.3V AD=Output adjustable Temperature&Rohs: C: -40~85C ,Pb Free Rohs Std. Package type: Y:TO-252 S:TO-263-2L S1:TO-263-3L Z:TO-220-3L ABSOLUTE MAXIMUM RATING Parameter Value Max Input Voltage Operating Junction Temperature(Tj) Ambient Temperature(Ta) Package TO-252 Thermal TO-263 Resistance TO-220 Storage Temperature(Ts) Lead Temperature & Time 15V 150C Pin Description： Fixed Version -40C –85C 12.5℃ / W 3℃ / W Pin No. 1 2 3 3℃ / W -40C -150C 260C,10S Definition Ground Output Input Adjustable Version Pin No. 1 2 3 Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect device reliability. RECOMMENDED WORK CONDITIONS Parameter Value Input Voltage Range Operating Junction Temperature(Tj) Symbol GND Vout Vin Symbol Definition Adj. Adjustable Vout Output Vin Input Marking information： Max.15V -40C –85C A：Means Manufacture Years & weeks B：Means Manufacture LOT No. C:Means Output Voltage Value D:Means Temp. Range&Rohs Std www.belling.com.cn 2 BL1085 ELECTRICAL CHARACTERISTICS Tj=25℃ Symbol Vref Parameter Reference Voltage Conditions Min Typ Max Unit 1.225 1.25 1.275 V 1.773 1.764 1.80 1.80 1.827 1.836 V 2.462 2.45 2.50 2.50 2.537 2.55 V 3.25 3.234 3.3 3.3 3.35 3.366 V 4.925 4.90 5.0 5.0 5.075 5.10 V BL1085-ADJ Iout=10mA 2.85V≤Vin≤10V 10 40 mV BL1085-1.8V Iout=10mA 3.4V≤Vin≤10V 10 40 mV BL1085-2.5V Iout=10mA 4.1V≤Vin≤10V 10 40 mV BL1085-3.3V Iout=10mA 4.9V≤Vin≤10V 10 40 mV BL1085-5.0V Iout=10mA 6.6V≤Vin≤10V 10 40 mV BL1085-ADJ Vin-Vout=3V, 10mA≤Iout≤3A 16 50 mV BL1085-1.8V Vin-Vout=3V, 0≤Iout≤3A 16 50 mV BL1085-2.5V Vin-Vout=3V, 0≤Iout≤3A 16 50 mV BL1085-3.3V Vin-Vout=3V, 0≤Iout≤3A 16 50 mV 10mA≤Iout≤3A ,1.5V≤Vin-Vout≤5V BL1085-1.80V Iout=0mA,Vin=4.8V,Tj=25℃ 10mA≤Iout≤3A ,3.4V≤Vin≤7V BL1085-2.50V Iout=0mA,Vin=4.8V,Tj=25℃ Vout Output Voltage 10mA≤Iout≤3A ,4.1V≤Vin≤7V BL1085-3.3V Iout=0mA,Vin=6.3V,Tj=25℃ 10mA ≤Iout≤3A ,4.9V≤Vin≤8V BL1085-5.0V Iout=0mA,Vin=8.0V,Tj=25℃ 10mA ≤Iout≤3A ,6.6V≤Vin≤10V ΔVout ΔVout Line Regulation (note 1) Load Regulation (note 1,2) www.belling.com.cn 3 BL1085 Vin-Vout Dropout Voltage (note 3) Current Limit BL1085-5.0V Vin-Vout=3V, 0≤Iout≤3A 16 50 mV ΔVout, ΔVref =1%，Iout=3A 1.3 1.5 V 3.2 Vin-Vout=3V, Tj=25℃ 4.5 A Ilimit Minimum Load Current (note 4) Iq IAdj Quiescent Current Adjust Pin Current (Adjustable Version) Ripple Rejection Ichange  JC BL1085-ADJ 3 10 Vin=10V 5 10 mA Vin=4.25V, Iout=10mA 45 120 uA F=120Hz,Cout=25uF( tan), Iout=3A,Vin-Vout=3V Adjust Pin Current Change 10mA≤Iout≤3A Temperature Stability Iout=10mA, Vin-Vout=1.5V Thermal Resistance junction to case 60 dB 0.4 1.5V≤Vin-Vout ≤6V TO-252 TO-263 TO-220 mA 12.5 3 3 10 uA 0.5 % ℃/ 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 -40℃≤ TA≤85℃,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. www.belling.com.cn 4 BL1085 BLOCK DIAGRAM DETAILED DESCRIPTION BL1085 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 BL1085 has an adjustable version and fixed versions, Chart1 is its typical application: www.belling.com.cn 5 BL1085 BL1085 BL1085 Typical Application of BL1085 APPLICATION HINTS Recommend using 10uF tan capacitor as bypass capacitor for all application circuit. Recommend using 22uF tan capacitor to assure circuit stability. 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 120 Ω~200 Ω ,the value of CAdj should satisfy this equation: 2*Fripple*CAdj