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| NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) FEATURES L1085 TO-252,263,220 GENERAL DESCRIPTION The L1085 is a positive and low dropout three-terminal voltage regulator with 3A output current capability. This device is designed for use in low voltage applications that offers lower dropout voltage and faster transient response. This device is fully protected against over current faults, over temperature operation, reversed input polarity, reversed lead insertion, transient voltage spike ...etc. On-Chips trimming the reference voltage to 1% and features the low dropout of maximum 1.45 volts. The L1085 Series regulators are available in the popular industry standard TO-220 TO-263 and TO-252 packages. Very easy to use, it requires only two external resistors to set the output voltage Low dropout voltage: 1.3V typical at up to 3A Low ground current Fast transient response Current & thermal limiting Line regulation: 0.5% typical Load regulation: 0.5% typical TO-220, TO-263 and TO-252 packages APPLICATIONS High current microprocessor supplies Low voltage logic supply Powering VGA & sound card Portable instrumentation Constant current regulator Post regulator for switching power supply TYPICAL APPLICATION Vin IN L1085 OUT ADJ Vref Vout R1 + Cin 10uF + Cout 10uF Iadj R2 Vo = Vref (1+R2/R1) + Iadj x R2 1. Cin needed if device is far from from filter capacitors. 2. Cout required for stability. - Basic Adjustable Regulator Circuit - 1 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 ABSOLUTE MAXIMUM RATINGS Maximum Supply Voltage Power Dissipation Thermal Resistance Junction to Case, JC Thermal Resistance Junction to Ambient, JA TO-263 TO-252 TO-220 7V Internally Limited 5 C/W Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) 0 to 125 C -40 to 150 C 260 C 60 C/W 70 C/W 50 C/W ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25 C.) Parameter Reference Voltage Dropout Voltage Line Regulation Load Regulation Minimum Load Current Symbol VREF Test Conditions VIN = 5V, IOUT = 10mA Typical 1.25V 1.3V 0.5% 0.5% 10mA 55A 5.0A 0.003% of VOUT 72dB Limits 1.23VMin 1.27VMax 1.45V 2% 2.5% VD VREF = 1%, IOUT = 3A REG(LINE) (VOUT + 1.5V) VIN 7V, IOUT = 10mA REG(LOAD) (VIN -VOUT) = 3V, 10mA IOUT 3A IO IADJ ICL VN RA f = 120Hz, CADJ = 22F for ADJ pin, VIN = 5V, IOUT = 3A 1.5V (VIN -VOUT) 5.75V VIN - VOUT = 2V Adjust Pin Current Current Limit RMS Output Noise Ripple Rejection Ratio 100A 4.0A (Min) 60dB (Min) DEVICE SELECTION GUIDE Device Package Marking L1085D TO-252 L1085D L1085S L1085S3 L1085T TO-220 L1085T TO-263 (2-Lead) TO-263 (3-Lead) L1085S L1085S3 2 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 PIN CONFIGURATIONS Pin # 1 2 3 Function Adjust Output Input Note: TAB is Output Pin 3 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) TO-263 (D2PAK) MECHANICAL DATA mm L1085 TO-252,263,220 mm Max. 15.8 4.7 1.35 Dimension H I J K 0.5 0.203 9.5 L M N 0.7 4.83 5.08 Min. 1.0 9.8 6.5 1.5 1.4 5.33 Typ. 1.5 Max. 1.8 10.3 Dimension A B C D E F G Min. 14.5 4.2 1.20 Typ. 15 2.8 0.3 -0.102 8.5 9 0.4 4 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) TO-263 (D2PAK) MECHANICAL DATA mm L1085 TO-252,263,220 mm Max. 15.8 4.7 1.35 Dimension H I J K 0.5 0.203 9.5 L M N 0.7 4.83 5.08 Min. 1.0 9.8 6.5 1.5 1.4 5.33 Typ. 1.5 Max. 1.8 10.3 Dimension A B C D E F G Min. 14.5 4.2 1.20 Typ. 15 2.8 0.3 -0.102 8.5 9 0.4 5 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) TO-220 (3-Lead) MECHANICAL DATA mm L1085 TO-252,263,220 mm Max. 10.54 2.87 29.3 15.4 9.2 0.88 Dimension H I J K L M N Min. 2.4 1.19 4.4 1.14 2.3 0.26 Typ. 2.54 1.27 4.6 1.27 2.6 0.46 7 Max. 2.68 1.35 4.8 1.4 2.9 0.66 Dimension A B C D E F G Min. 9.78 2.61 28.5 14.6 8.4 0.72 Typ. 10.16 2.74 20 28.9 15.0 8.8 0.8 6 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 TO-252 (DPAK) MECHANICAL DATA mm Dimension A B C D E F G Min. 9.35 2.2 0.48 0.89 0.45 0.03 6 Typ. Max. 10.1 2.4 0.6 1.5 0.6 0.23 6.2 Dimension H I J K L M N 6.4 5.2 0.6 0.64 4.4 Min. mm Typ. 0.8 6.6 5.4 1 0.9 4.6 Max. 7 MAY-31-2001 |
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