3A Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM L1085 TO-252,263,220 GENERAL DESCRIPTION FEATURES 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. z Very easy to use, it requires only two external resistors to set the output voltage z Low dropout voltage: 1.3V typical at up to 3A z Low ground current z Fast transient response z Current & thermal limiting z Line regulation: 0.5% typical z Load regulation: 0.5% typical z TO-220, TO-263 and TO-252 packages 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. APPLICATIONS z High current microprocessor supplies z Low voltage logic supply z Powering VGA & sound card z Portable instrumentation z Constant current regulator z Post regulator for switching power supply The L1085 Series regulators are available in the popular industry standard TO-220 TO-263 and TO-252 packages. TYPICAL APPLICATION Vin Vout L1085 IN OUT ADJ Cin Vref R1 + + 10uF Cout 10uF R2 Iadj 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 3A Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM L1085 TO-252,263,220 ABSOLUTE MAXIMUM RATINGS z Maximum Supply Voltage z Operating Junction Temperature Range z Storage Temperature Range z Lead Temperature (Soldering, 10 Seconds) 7V Internally Limited z Power Dissipation z Thermal Resistance Junction to Case, θJC z Thermal Resistance Junction to Ambient, θJA TO-263 TO-252 TO-220 5 °C/W 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 Typical VIN = 5V, IOUT = 10mA 1.25V VD ΔVREF = 1%, IOUT = 3A REG(LINE) (VOUT + 1.5V) ≤ VIN ≤ 7V, IOUT = 10mA REG(LOAD) (VIN -VOUT) = 3V, 10mA ≤ IOUT ≤ 3A 1.3V 0.5% 0.5% 1.5V ≤ (VIN -VOUT) ≤ 5.75V 10mA IO Adjust Pin Current Current Limit IADJ ICL RMS Output Noise VN Ripple Rejection Ratio RA VIN - VOUT = 2V Limits 1.23VMin 1.27VMax 1.45V 2% 2.5% 55µA 5.0A 0.003% of VOUT 100µA 4.0A (Min) 72dB 60dB (Min) f = 120Hz, CADJ = 22µF for ADJ pin, VIN = 5V, IOUT = 3A DEVICE SELECTION GUIDE Device L1085D Package TO-252 Marking L1085D L1085S L1085S3 TO-263 (2-Lead) TO-263 (3-Lead) L1085S 2 L1085S3 L1085T TO-220 L1085T MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 PIN CONFIGURATIONS Pin # Function 1 Adjust 2 Output 3 Input Note: TAB is Output Pin 3 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 TO-263 (D2PAK) MECHANICAL DATA mm Dimension mm Min. Typ. Max. A 14.5 15 15.8 B 4.2 C 1.20 D Dimension Min. Typ. Max. H 1.0 1.5 1.8 4.7 I 9.8 1.35 J 6.5 K 1.5 2.8 E 0.3 F -0.102 G 8.5 0.4 9 0.5 L 0.7 0.203 M 4.83 9.5 N 4 10.3 1.4 5.08 5.33 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 TO-263 (D2PAK) MECHANICAL DATA mm Dimension mm Min. Typ. Max. A 14.5 15 15.8 B 4.2 C 1.20 D Dimension Min. Typ. Max. H 1.0 1.5 1.8 4.7 I 9.8 1.35 J 6.5 K 1.5 2.8 E 0.3 F -0.102 G 8.5 0.4 9 0.5 L 0.7 0.203 M 4.83 9.5 N 5 10.3 1.4 5.08 5.33 MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 TO-220 (3-Lead) MECHANICAL DATA mm Dimension mm Min. Typ. Max. A 9.78 10.16 10.54 B 2.61 2.74 2.87 C Dimension 20 Min. Typ. Max. H 2.4 2.54 2.68 I 1.19 1.27 1.35 J 4.4 4.6 4.8 D 28.5 28.9 29.3 K 1.14 1.27 1.4 E 14.6 15.0 15.4 L 2.3 2.6 2.9 F 8.4 8.8 9.2 M 0.26 0.46 0.66 G 0.72 0.8 0.88 N 6 7° MAY-31-2001 NIKO-SEM 3A Adjustable Low Dropout Linear Regulator (LDO) L1085 TO-252,263,220 TO-252 (DPAK) MECHANICAL DATA mm Dimension Min. Typ. mm Max. Dimension Min. Typ. Max. A 9.35 10.1 H B 2.2 2.4 I 6.4 6.6 C 0.48 0.6 J 5.2 5.4 D 0.89 1.5 K 0.6 1 E 0.45 0.6 L 0.64 0.9 F 0.03 0.23 M 4.4 4.6 G 6 6.2 N 7 0.8 MAY-31-2001