LM1085

3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed) FEATURES ● Output Current of 3A ● Fast Transient Response ● 0.04% Line Regulation ● 0.2% Load Regulation ● Internal Thermal and Current Limiting ● Adjustable or Fixed Output Voltage(1.5V, 1.8V, 2.5V, 3.3V, 5.0V) ● Surface Mount Package TO-263 3LD & TO-252 3L ● 100% Thermal Limit Burn-in ● Low Dropout Voltage 1.5V at 3A Output Current ● Moisture Sensitivity Level 3 TO-263 PKG LM1085 TO-252 PKG APPLICATIONS ● High Efficiency Linear Regulators / Power Supply ● High Efficiency "Green" Computer Systems ● Constant Current Regulators ● Portable Instrumentation ● SMPS Post-Regulator ● Adjustable Power Supplies ● Powering VGA & Sound Card 1. ADJ / GND 2. OUTPUT 3. INPUT * Heatsink surface connected to Pin 2. ORDERING INFORMATION Device LM1085R-X.X LM1085RS-X.X Package TO-263 3LD TO-252 3LD (X.X=VOUT=1.5V, 1.8V, 2.5V, 3.3V, 5.0V, ADJ) DESCRIPTION The LM1085 series of positive adjustable and fixed regulators are designed to provide 3A with high efficient. All internal circuitry is designed to operate down to 1.5V input to output differential. On-chip trimming adjusts the reference voltage to 1%. It's low dropout voltage and fast transient response make it ideal for low voltage microprocessor applications. Internal current and thermal limiting provides protection against any overload condition that would create excessive junction temperature. TEST & TYPICAL APPLICATION CIRCUIT LM1085-3.3V LM1085-ADJ Note (1) C1 needed if device is far away from filter capacitors. (2) C2 minimum value required for stability VREF=VOUT-VADJ=1.25V(Typ.) IADJ=55㎂(Typ.) VOUT = VREF x (1+RF2/RF1) + IADJ x RF2 Nov. 2010-Rev. 1.4 -1- HTC 3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed) BLOCK DIAGRAM LM1085 ABSOULTE MAXIMUM RATINGS CHARACTERISTIC Supply Voltage Operating Temperature Range Junction Temperarture Storage Temperature Range Thermal Resistance Junction to Case TO-263 Thermal Resistance Junction to Ambient TO-263 Lead Temperature (Soldering) 10 sec. Maximum Output Current SYMBOL VIN TA TJ Tstg Tjc Tja Tsol Imax VALUE 12 -10 ~ 70 0 ~ 125 -65 ~ 150 3 60 300 3 UNIT V ℃ ℃ ℃ C/W C/W ℃ A -2- HTC 3A L.D.O. VOLTAGE REGULATOR (Adjustable & Fixed) LM1085 ELECTRICAL CHARACTERISTICS IOUT=100mA, TA=25°C, unless otherwise specified PARAMETER 1.5V Version Output Voltage 1.8V Version Output Voltage 2.5V Version Output Voltage 3.3V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Reference Voltage (VREF) VIN≤7V, P≤PMAX 1.5V≤(VIN-VOUT)≤5.75V, 10mA ≤IOUT≤3A Min. Load Current(Note 3) Line Regulation (ΔVREF(VIN)) 1.5V≤(VIN-VOUT)≤5.75V 2.75V≤VIN≤7V, IOUT=10mA, T J=25℃ 1.238 1.225 1.25 1.25 5 0.05 0.1 1.3 1.263 V 1.275 13 0.3 0.4 1.5 mA % % V 0≤IOUT≤3A, 5.5V≤VIN 4.900 5.0 5.100 V 0