LT1083/LT1084/LT1085 Fixed 3A, 5A, 7.5A Low Dropout Positive Fixed Regulators Features Description Three-Terminal 3.3V, 3.6V, 5V and 12V nn Output Current of 3A, 5A or 7.5A nn Operates Down to 1V Dropout nn Guaranteed Dropout Voltage at Multiple Current Levels nn Line Regulation: 0.015% nn Load Regulation: 0.1% nn 100% Thermal Limit Functional Test nn Adjustable Versions Available Applications The LT®1083 series of positive adjustable regulators are designed to provide 3A, 5A and 7.5A with higher efficiency than currently available devices. All internal circuitry is designed to operate down to 1V input to output differential and the dropout voltage is fully specified as a function of load current. Dropout is guaranteed at a maximum of 1.5V at maximum output current, decreasing at lower load currents. On-chip trimming adjusts the output voltage to 1%. Current limit is also trimmed, minimizing the stress on both the regulator and power source circuitry under overload conditions. High Efficiency Linear Regulators Post Regulators for Switching Supplies nn Constant Current Regulators nn Battery Chargers The LT1083 series devices are pin compatible with older three-terminal regulators. A 10µF output capacitor is required on these new devices; however, this is usually included in most regulator designs. nn nn nn DEVICE OUTPUT CURRENT* LT1083 LT1084 LT1085 7.5 Amps 5.0 Amps 3.0 Amps *For a 1.5A low dropout regulator see the LT1086 data sheet. Unlike PNP regulators, where up to 10% of the output current is wasted as quiescent current, the LT1083 quiescent current flows into the load, increasing efficiency. L, LT, LTC, LTM, Linear Technology, the Linear logo and OPTI-LOOP are registered trademarks and UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 5V, 7.5A Regulator 5V AT 7.5A LT1083-5 + + 10µF 22µF* TANTALUM LT1083/4/5 TA01 *REQUIRED FOR STABILITY INPUT/OUTPUT VOLTAGE DIFFERENTIAL (V) VIN ≥ 6.5V Dropout Voltage vs Output Current 2 1 0 0 IFULLLOAD/2 OUTPUT CURRENT (A) IFULLLOAD 1083/4/5 TA02 1083ffe For more information www.linear.com/LT1083 1 LT1083/LT1084/LT1085 Fixed Absolute Maximum Ratings (Note 1) Power Dissipation............................... Internally Limited Input Voltage*........................................................... 30V Operating Input Voltage 3.3V, 3.6V Devices................................................ 20V 5V Devices............................................................ 20V 12V Devices.......................................................... 25V Operating Junction Temperature Range C-Grades: Control Section................... 0°C to 125°C Power Transistor................. 0°C to 150°C I-Grades: Control Section............... –40°C to 125°C Power Transistor............. –40°C to 150°C M-Grades: (OBSOLETE) Control Section............... –55°C to 150°C Power Transistor............. –55°C to 200°C Storage Temperature Range.................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec)................... 300°C *Although the devices maximum operating voltage is limited, (20V for a 3V, 5V device, and 25V for a 12V device) the devices are guaranteed to withstand transient input voltages up to 30V. For input voltages greater than the maximum operating input voltage some degradation of specifications will occur. For input/output voltage differentials greater than 15V, a minimum external load of 5mA is required to maintain regulation. preconditioning 100% Thermal Limit Functional Test. Order Information TAB IS OUTPUT FRONT VIEW TAB IS OUTPUT 3 VIN 2 VOUT 1 GND VIN 2 VOUT 1 GND θJA = 35°C/W OBSOLETE PACKAGE θJA = 50°C/W FRONT VIEW CASE IS OUTPUT 2 TAB IS OUTPUT 1 GND K PACKAGE 2-LEAD TO-3 METAL CAN θJA = 35°C/W OBSOLETE PACKAGE 2 3 P PACKAGE 3-LEAD TO-3P PLASTIC T PACKAGE 3-LEAD PLASTIC TO-220 VIN FRONT VIEW 3 VIN 2 VOUT 1 GND M PACKAGE 3-LEAD PLASTIC DD θJA = 30°C/W* *WITH PACKAGE SOLDERED TO 0.5IN2 COPPER AREA OVER BACKSIDE GROUND PLANE OR INTERNAL POWER PLANE. θJA CAN VARY FROM 20°C/W TO >40°C/W DEPENDING ON MOUNTING TECHNIQUE 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1083CP-5#PBF NA LT1083CP-5 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1083CP-12#PBF NA LT1083CP-12 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1084CP-5#PBF NA LT1084CP-5 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1084CP-12#PBF NA LT1084CP-12 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1084CT-3.3#PBF NA LT1084CT-3.3 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1084CT-5#PBF NA LT1084CT-5 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1084CT-12#PBF NA LT1084CT-12 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-3.3#PBF NA LT1085CT-3.3 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-3.6#PBF NA LT1085CT-3.6 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-5#PBF NA LT1085CT-5 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-12#PBF NA LT1085-12 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CM-3.3#PBF LT1085CM-3.3#TRPBF LT1085CM-3.3 3-Lead Plastic DD Control: 0°C to 125°C Power: 0°C to 150°C LT1085CM-3.6#PBF LT1085CM-3.6#TRPBF LT1085CM-3.6 3-Lead Plastic DD Control: 0°C to 125°C Power: 0°C to 150°C LT1085IM-3.6#PBF LT1085IM-3.6#TRPBF LT1085IM-3.6 3-Lead Plastic DD Control: –40°C to 125°C Power: –40°C to 150°C OBSOLETE PACKAGE LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1083CP-5 NA LT1083CP-5 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1083CP-12 NA LT1083CP-12 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1084CP-5 NA LT1084CP-5 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1084CP-12 NA LT1084CP-12 3-Lead Plastic TO-3P Control: 0°C to 125°C Power: 0°C to 150°C LT1083CK-5 NA LT1083CK-5 2-Lead TO-3 Metal Can Control: 0°C to 125°C Power: 0°C to 150°C LT1083CK-12 NA LT1083CK-12 2-Lead TO-3 Metal Can Control: 0°C to 125°C Power: 0°C to 150°C LT1083MK-5 NA LT1083MK-5 2-Lead TO-3 Metal Can Control: –55°C to 150°C Power: –55°C to 200°C LT1083MK-12 NA LT1083MK-12 2-Lead TO-3 Metal Can Control: –55°C to 150°C Power: –55°C to 200°C 1083ffe For more information www.linear.com/LT1083 3 LT1083/LT1084/LT1085 Fixed Order Information LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1084CK-5 NA LT1084CK-5 2-Lead TO-3 Metal Can Control: 0°C to 125°C Power: 0°C to 150°C LT1084CK-12 NA LT1084CK-12 2-Lead TO-3 Metal Can Control: 0°C to 125°C Power: 0°C to 150°C LT1084MK-5 NA LT1084MK-5 2-Lead TO-3 Metal Can Control: –55°C to 150°C Power: –55°C to 200°C LT1084MK-12 NA LT1084MK-12 2-Lead TO-3 Metal Can Control: –55°C to 150°C Power: –55°C to 200°C LT1085CK-5 NA LT1085CK-5 2-Lead TO-3 Metal Can Control: 0°C to 125°C Power: 0°C to 150°C LT1085CK-12 NA LT1085CK-12 2-Lead TO-3 Metal Can Control: 0°C to 125°C Power: 0°C to 150°C LT1085MK-5 NA LT1085MK-5 2-Lead TO-3 Metal Can Control: –55°C to 150°C Power: –55°C to 200°C LT1085MK-12 NA LT1085MK-12 2-Lead TO-3 Metal Can Control: –55°C to 150°C Power: –55°C to 200°C OBSOLETE PACKAGE LT1084CT-3.3 NA LT1084CT-3.3 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1084CT-5 NA LT1084CT-5 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1084CT-12 NA LT1084CT-12 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-3.3 NA LT1085CT-3.3 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-3.6 NA LT1085CT-3.6 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-5 NA LT1085CT-5 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CT-12 NA LT1085-12 3-Lead Plastic TO-220 Control: 0°C to 125°C Power: 0°C to 150°C LT1085CM-3.3 LT1085CM-3.3#TR LT1085CM-3.3 3-Lead Plastic DD Control: 0°C to 125°C Power: 0°C to 150°C LT1085CM-3.6 LT1085CM-3.6#TR LT1085CM-3.6 3-Lead Plastic DD Control: 0°C to 125°C Power: 0°C to 150°C LT1085IM-3.6 LT1085IM-3.6#TR LT1085IM-3.6 3-Lead Plastic DD Control: –40°C to 125°C Power: –40°C to 150°C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 4 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS Output Voltage LT1084-3.3 LT1085-3.3 LT1085-3.6 Line Regulation UNITS IOUT = 0mA, TJ = 25°C, VIN = 8V (K Package Only) 4.8V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ IFULL_LOAD (Notes 3, 4, 9) l 3.270 3.235 3.300 3.300 3.330 3.365 V V VIN = 5V, IOUT = 0mA, TJ = 25°C (K Package Only) 4.8V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ IFULL_LOAD (Notes 3, 4, 9) l 3.270 3.235 3.300 3.300 3.330 3.365 V V VIN = 5V, IOUT = 0mA, TJ = 25°C (K Package Only) 5V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ IFULL_LOAD (Note 9) 5V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ IFULL_LOAD, TJ ≥ 0°C (Notes 3, 4, 9) 3.564 3.500 3.528 3.600 l 3.636 3.672 3.672 V V V 3.672 3.672 3.672 3.672 V V V V LT1083/4/5-5 IOUT = 0mA, TJ = 25°C, VIN = 8V (K Package Only) 0 ≤ IOUT ≤ IFULL_LOAD, 6.5V ≤ VIN ≤ 20V (Notes 4, 6, 7, 9) 4.950 4.900 5.000 5.000 5.050 5.100 V V LT1083/4/5-12 IOUT = 0mA, TJ = 25°C, VIN = 15V (K Package Only) 0 ≤ IOUT ≤ IFULL_LOAD, 13.5V ≤ VIN ≤ 25V (Notes 4, 6, 7, 9) 11.880 11.760 12.000 12.000 12.120 12.240 V V LT1084-3.3 IOUT = 0mA, TJ = 25°C, 4.8V ≤ VIN ≤ 15V l 0.5 1.0 6 6 mV mV l 0.5 1.0 6 6 mV mV l 0.5 1.0 6 6 mV mV l 0.5 1.0 10 10 mV mV l 1.0 2.0 25 25 mV mV l 3 7 15 20 mV mV l 3 7 15 20 mV mV l 3 7 15 20 mV mV l 5 10 20 35 mV mV l 12 24 36 72 mV mV LT1083/4/5-5 LT1083/4/5-12 LT1084-3.3 LT1085-3.3 LT1085-3.6 LT1083/4/5-5 LT1083/4/5-12 Current Limit MAX 5V ≤ VIN ≤ 15V, 0 ≤ IOUT ≤ 2.5A (Notes 3, 4, 9) VIN = 4.75V, IOUT = 3A, TJ ≥ 0°C VIN = 4.75V, IOUT = 2.5A, TJ ≥ 0°C VIN = 4.75V, IOUT = 1.5A, TJ > 0°C LT1085-3.6 Dropout Voltage TYP LT1085-3.6 LT1085-3.3 Load Regulation MIN l 3.528 3.350 3.450 3.528 4.8V ≤ VIN ≤ 15V, IOUT = 0mA, TJ= 25°C 4.8V ≤ VIN ≤ 15V, IOUT = 0mA, TJ= 25°C IOUT = 0mA, TJ = 25°C, 6.5V ≤ VIN ≤ 20V (Notes 2, 3) IOUT = 0mA, TJ = 25°C, 13.5V ≤ VIN ≤ 25V (Notes 2, 3) VIN = 5V, 0 ≤ IOUT ≤ 5A, TJ = 25°C VIN = 5V, 0 ≤ IOUT ≤ 3A, TJ = 25°C VIN = 5.25V, 0 ≤ IOUT ≤ 3A, TJ = 25°C VIN = 8V, 0 ≤ IOUT ≤ IFULL_LOAD, TJ = 25°C (Notes 2, 3, 4, 6) VIN = 15V, 0 ≤ IOUT ≤ IFULL_LOAD, TJ = 25°C (Notes 2, 3, 4, 6) LT1084/5-3.3 ∆VOUT = 33mV, IOUT = IFULL_LOAD (Notes 5, 6) l 1.3 1.5 V LT1085-3.6 ∆VOUT = 36mV, IOUT = IFULL_LOAD (Notes 5, 6) l 1.3 1.5 V LT1083/4/5-5 ∆VOUT = 50mV, IOUT = IFULL_LOAD (Notes 5, 6) l 1.3 1.5 V LT1083/4/5-12 ∆VOUT = 120mV, IOUT = IFULL_LOAD (Notes 5, 6) l 1.3 1.5 LT1083-5 VIN = 10V l 8.0 9.5 A LT1083-12 VIN = 17V l 8.0 9.5 A LT1084-3.3 VIN = 8V l 5.5 6.5 A LT1084-5 VIN = 10V l 5.5 6.5 A LT1084-12 VIN = 17V l 5.5 6.5 A LT1085-3.3/3.6 VIN = 8V l 3.2 4.0 A LT1085-5 VIN = 10V l 3.2 4.0 A LT1085-12 VIN = 17V l 3.2 4.0 A V 1083ffe For more information www.linear.com/LT1083 5 LT1083/LT1084/LT1085 Fixed Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS TYP MAX UNITS Quiescent Current LT1084-3.3 VIN = 18V l MIN 5.0 10.0 mA LT1085-3.3 VIN = 18V l 5.0 10.0 mA LT1085-3.6 VIN = 18V l 5.0 10.0 mA LT1083/4/5-5 VIN ≤ 20V l 5.0 10.0 mA LT1083/4/5-12 VIN ≤ 25V l Thermal Regulation LT1083-5/12 TA = 25°C, 30ms pulse LT1084-3.3/5/12 LT1085-3.3/3.6/5/12 Ripple Rejection f = 120Hz, COUT = 25µF Tantalum, IOUT = IFULL_LOAD (Note 4) LT1084-3.3 f = 120Hz, COUT = 25µF Tantalum, IOUT = 5A, VIN = 6.3V LT1085-3.3 f = 120Hz, COUT = 25µF Tantalum, VIN = 6.3V, IOUT = 3A LT1085-3.6 f = 120Hz, COUT = 25µF Tantalum, VIN = 6.6V, IOUT = 3A LT1083/4/5-5 VIN = 8V (Note 6) LT1083/4/5-12 VIN = 15V (Note 6) Temperature Stability l l l l l l 60 60 60 60 54 5.0 10.0 mA 0.002 0.003 0.004 0.010 0.015 0.020 %/W %/W %/W 0.5 Long Term Stability TA = 125°C, 1000 Hrs. 0.03 RMS Output Noise (% of VOUT) TA = 25°C, 10Hz = ≤ f ≤ 10kHz 0.003 Thermal Resistance Junction-to-Case Control Circuitry/Power Transistor (See Applications Information) LT1083 K Package P Package % 1.0 % % 0.6/1.6 0.5/1.6 °C/W °C/W LT1084 K Package P Package T Package 0.75/2.3 0.65/2.3 0.65/2.7 °C/W °C/W °C/W LT1085 K Package T Package DD Package 0.9/3.0 0.7/3.0 0.7/3.0 °C/W °C/W °C/W Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: See thermal regulation specifications for changes in output voltage due to heating effects. Load and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. Note 3: Line and load regulation are guaranteed up to the maximum power dissipation (60W for the LT1083, 45W for the LT1084 (K, P), 30W for the LT1084 (T) and 30W for the LT1085). Power dissipation is determined by the input/output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range. Note 4: IFULL_LOAD is defined in the current limit curves. The IFULL_LOAD curve is defined as the minimum value of current limit as a function of input to output voltage. Note that the 60W power dissipation for the LT1083 (45W for the LT1084 (K, P), 30W for the LT1084 (T), 30W for the LT1085) is only achievable over a limited range of input to output voltage. 6 dB dB dB dB dB 72 72 72 68 60 Note 5: Dropout voltage is specified over the full output current range of the device. Test points and limits are shown on the Dropout Voltage curve. Note 6: For LT1083 IFULL_LOAD is 5A for – 55°C ≤ TJ ≤ – 40°C and 7.5A for TJ ≥ – 40°C. Note 7: 1.7V ≤ (VIN – VOUT) ≤ 25V for LT1084 at – 55°C ≤ TJ ≤ – 40°C. Note 8: Dropout voltage 1.7V maximum for LT1084 at – 55°C ≤ TJ ≤ –40°C. Note 9: Full load current is not available at all input-output voltages. See Notes 3, 4, 6. 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Typical Performance Characteristics LT1083 Short-Circuit Current –40°C ≤ TJ ≤ 150°C 0°C ≤ TJ ≤ 125°C TJ = 150°C TJ = 25°C TJ = –55°C 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 9 10 8 6 – 55°C 4 2 0 10 150°C IFULL_LOAD GUARANTEED 0 20 30 15 25 5 10 INPUT/OUTPUT DIFFERENTIAL (V) SHORT-CIRCUIT CURRENT (A) MINIMUN INPUT/OUTPUT DIFFERENTIAL (V) 0°C ≤ TJ ≤ 125°C TJ = – 55°C 1 TJ = 25°C 7 150°C 25°C 6 –55°C 5 4 3 IFULL_LOAD GUARANTEED 2 3 4 2 OUTPUT CURRENT (A) 5 0 6 0 20 15 10 25 30 5 INPUT/OUTPUT DIFFERENTIAL (V) LT1083/4/5 FIXEDG04 SHORT-CIRCUIT CURRENT (A) MINIMUM INPUT/OUTPUT DIFFERENTIAL (V) INDICATES GUARANTEED TEST POINT 1 TJ = –55°C TJ = 150°C 0 0 0.05 0 –0.05 –0.10 –0.15 TJ = 25°C 3 2 1 OUTPUT CURRENT (A) 4 LT1083/4/5 FIXED G07 0 25 50 75 100 125 150 TEMPERATURE (°C) LT1083/4/5 FIXED G06 LT1085 Short-Circuit Current 0°C ≤ TJ ≤ 125°C 25 50 75 100 125 150 TEMPERATURE (°C) ∆I = 5A –0.20 –50 –25 35 LT1085 Load Regulation 6 – 55°C ≤ TJ ≤ 150°C 0 LT1083/4/5 FIXED G05 LT1085 Dropout Voltage 2 –0.15 LT1084 Load Regulation 8 1 0 –0.10 0.10 9 – 55°C ≤ TJ ≤ 150°C 0 –0.05 LT1083/4/5 FIXED G03 10 INDICATES GUARANTEED TEST POINT TJ = 150°C 0 LT1084 Short Circuit Current LT1084 Dropout Voltage 1 0.05 LT1083/4/5 FIXED G02 LT1083/4/5 FIXED G01 2 ∆I = 7.5A –0.20 –50 –25 35 OUTPUT VOLTAGE DEVIATION (%) 0 25°C 0.10 OUTPUT VOLTAGE DEVIATION (%) 0 0.10 OUTPUT VOLTAGE DEVIATION (%) INDICATES GUARANTEED TEST POINT 1 LT1083 Load Regulation 12 SHORT-CIRCUIT CURRENT (A) MINIMUM INPUT/OUTPUT DIFFERENTIAL (V) LT1083 Dropout Voltage 2 5 25°C 4 150°C 3 –55°C 2 IFULL_LOAD GUARANTEED 1 0 0 20 30 15 25 5 10 INPUT/OUTPUT DIFFERENTIAL (V) 35 LT1083/4/5 FIXED G08 ∆I = 3A 0.05 0 –0.05 –0.10 –0.15 –0.20 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) LT1083/4/5 FIXED G09 1083ffe For more information www.linear.com/LT1083 7 LT1083/LT1084/LT1085 Fixed Typical Performance Characteristics LT1083/4/5-5 Ripple Rejection vs Current LT1083/4/5-5 Ripple Rejection VRIPPLE ≤ 3VP-P VRIPPLE ≤ 0.5VP-P 50 80 (VIN – VOUT) ≥ 3V 60 (VIN – VOUT) ≥ VDROPOUT 40 30 20 fR = 120Hz VRIPPLE ≤ 3VP-P 70 fR = 20kHz VRIPPLE ≤ 0.5VP-P 60 50 40 30 20 10 IOUT = IFULL_LOAD 0 10 100 1k 10k FREQUENCY (Hz) 2.0 90 RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) 70 0 100k 0 0.8 0.2 0.6 0.4 OUTPUT CURRENT (0 TO IFULLLOAD) (VIN – VOUT) ≥ VDROPOUT 20 100 90 1k 10k FREQUENCY (Hz) 70 60 fR = 20kHz VRIPPLE ≤ 0.5VP-P 50 40 IOUT = IFULL_LOAD 100 80 fR = 120Hz VRIPPLE ≤ 3VP-P 70 10 0 10 25 50 75 100 125 150 TEMPERATURE (°C) LT1083 Maximum Power Dissipation* 50 40 30 20 20 10 10 0 0.8 0.2 0.6 0.4 OUTPUT CURRENT (0 TO IFULLLOAD) 1083/4/5 FIXED G13 1.0 1083/4/5 FIXED G14 LT1083MK 60 30 0 100k POWER (W) (VIN – VOUT) ≥ 3V 30 0 LT1183/4/5 FIXED G12 90 RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) 60 40 –2.0 –50 –25 1.0 100 80 50 –1.0 LT1083/4/5-12 Ripple Rejection vs Current VRIPPLE ≤ 0.5VP-P 70 0 1083/4/5 FIXED G11 LT1083/4/5-12 Ripple Rejection VRIPPLE ≤ 3VP-P 1.0 10 1083/4/5 FIXED G10 80 Temperature Stability 100 OUTPUT VOLTAGE CHANGE (%) 80 LT1083CP LT1083CK 0 50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (°C) * AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE LT1083/4/5 FIXED G15 LT1084 Maximum Power Dissipation* LT1085 Maximum Power Dissipation* 60 50 50 40 LT1084MK 30 20 10 LT1084CT LT1084CP 30 20 LT1085MK LT1085CT 10 LT1084CK LT1085CK 0 50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (°C) * AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE LT1083/4/5 FIXED G16 8 POWER (W) POWER (W) 40 0 50 60 70 80 90 100 110 120 130 140 150 CASE TEMPERATURE (°C) * AS LIMITED BY MAXIMUM JUNCTION TEMPERATURE LT1083/4/5 FIXED G17 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Block Diagram VIN + – THERMAL LIMIT VOUT GND LT1083/4/5 BD Applications Information The LT1083 family of three-terminal regulators are easy to use and have all the protection features that are expected in high performance voltage regulators. They are short circuit protected, have safe area protection as well as thermal shutdown to turn off the regulator should the temperature exceed about 165°C. These regulators offer lower dropout voltage and more precise reference tolerance. Further, the reference stability with temperature is improved over older types of regulators. The only circuit difference between using the LT1083 family and older regulators is that they require an output capacitor for stability. Stability The circuit design used in the LT1083 family requires the use of an output capacitor as part of the device frequency compensation. For all operating conditions, the addition of 150µF aluminum electrolytic or a 22µF solid tantalum on the output will ensure stability. Normally capacitors much smaller than this can be used with the LT1083. Many different types of capacitors with widely varying characteristics are available. These capacitors differ in capacitor tolerance (sometimes ranging up to ±100%), equivalent series resistance, and capacitance temperature coefficient. The 150µF or 22µF values given will ensure stability. Normally, capacitor values on the order of 100µF are used in the output of many regulators to ensure good transient response with heavy load current changes. Output capacitance can be increased without limit and larger values of output capacitance further improve stability and transient response of the LT1083 regulators. Another possible stability problem that can occur in monolithic IC regulators is current limit oscillations. These can occur because in current limit the safe area protection exhibits a negative impedance. The safe area protection decreases the current limit as the input-to-output voltage increases.That is the equivalent of having a negative 1083ffe For more information www.linear.com/LT1083 9 LT1083/LT1084/LT1085 Fixed applications information resistance since increasing voltage causes current to decrease. Negative resistance during current limit is not unique to the LT1083 series and has been present on all power IC regulators. The value of negative resistance is a function of how fast the current limit is folded back as input-to-output voltage increases. This negative resistance can react with capacitors or inductors on the input to cause oscillations during current limiting. Depending on the value of series resistance, the overall circuitry may end up unstable. Since this is a system problem, it is not necessarily easy to solve; however it does not cause any problems with the IC regulator and can usually be ignored. Protection Diodes In normal operation the LT1083 family does not need any protection diodes, The internal diode between the input and the output pins of the LT1083 family can handle microsecond surge currents of 50A to 100A. Even with large output capacitances it is very difficult to get those values of surge current in normal operation. Only with high value output capacitors, such as 1000µF to 5000µF and with the input pin instantaneously shorted to ground, can damage occur. A crowbar circuit at the input of the LT1083 can generate those kinds of currents and a diode from output-to-input is then recommended. Normal power supply cycling or even plugging and unplugging in the system will not generate currents large enough to do any damage. D1 1N4002 (OPTIONAL) VIN IN LT1083 ADJ OUT VOUT + COUT 150µF Overload Recovery Like any of the IC power regulators, the LT1083 has safe area protection. The safe area protection decreases the current limit as input-to-output voltage increases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The LT1083 protection is designed to provide some output current at all values of input-to-output voltage up to the device breakdown. When power is first turned on, as the input voltage rises, the output follows the input, allowing the regulator to start up into very heavy loads. During the start-up, as the input voltage is rising, the input-to-output voltage differential remains small allowing the regulator to supply large output currents. With high input voltage a problem can occur wherein removal of an output short will not allow the output voltage to recover. Older regulators such as the 7800 series, also exhibited this phenomenon so it is not unique to the LT1083. The problem occurs with a heavy output load when the input voltage is high and the output voltage is low, such as immediately after a removal of a short. The load line for such a load may intersect the output current curve at two points. If this happens there are two stable output operating points for the regulator. With this double intersection the power supply may need to be cycled down to zero and brought up again to make the output recover. Ripple Rejection In applications that require improved ripple rejection the LT1083 series adjustable regulators should be used. With LT1083 series adjustable regulators the addition of a bypass capacitor from the adjust pin to ground will reduce output ripple by the ratio of VOUT/1.25V. See LT1083 series adjustable regulator data sheet. 1083/4/5 AI01 10 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed applications information Load Regulation Because the LT1083 is a three-terminal device, it is not possible to provide true remote load sensing. Load regulation will not be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for the load regulation is measured at the bottom of the package. Negative side sensing is a true Kelvin connection, with the ground pin of the device returned to the negative side of the load. Thermal Considerations The LT1083 series of regulators have internal power and thermal limiting circuitry designed to protect the device under overload conditions. For continuous normal load conditions however, maximum junction temperature ratings must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. This includes junction-to-case, case- to-heat sink interface, and heat sink resistance itself. New thermal resistance specifications have been developed to more accurately reflect device temperature and ensure safe operating temperatures. The data section for these new regulators provides a separate thermal resistance and maximum junction temperature for both the Control Section and the Power Section. Previous regulators, with a single junction-to-case thermal resistance specification, used an average of the two values provided here and therefore could allow excessive junction temperatures under certain conditions of ambient temperature and heat sink resistance. To avoid this possibility, calculations should be made for both sections to ensure that both thermal limits are met. Junction-to-case thermal resistance is specified from the IC junction to the bottom of the case directly below the die. This is the lowest resistance path for heat flow. Proper mounting is required to ensure the best possible thermal flow from this area of the package to the heat sink. Thermal compound at the case-to-heat sink interface is strongly recommended. If the case of the device must be electronically isolated, a thermally conductive spacer can be used as long as its added contribution to thermal resistance is considered. Note that the case of all devices in this series is electronically connected to the output. For example, using a LT1083-5CP (TO-3P, Commercial) and assuming: VIN(max continuous) = 9V, VOUT = 5V, IOUT = 6A, TA = 75°C, θHEAT SINK = 1°C/W, θCASE-TO-HEAT SINK = 0.2°C/W for P package with thermal compound. Power dissipation under these conditions is equal to: PD = (VIN – VOUT) (IOUT) = 24W Junction temperature will be equal to: TJ = TA + PD (θ HEAT SINK + θCASE-TO-HEAT SINK + θJC) For the Control Section: TJ = 75°C + 24W (1°C/W + 0.2°C/W + 0.5°C/W) = 118°C 118°C < 125°C = TJMAX (Control Section Commer cial Range) For the Power Transistor: TJ = 75°C + 24W (1°C/W + 0.2°C/W + 1.6°C/W)= 142°C 142°C < 150°C = TJMAX (Power Transistor Commer cial Range) In both cases the junction temperature is below the maximum rating for the respective sections, ensuring reliable operation. 1083ffe For more information www.linear.com/LT1083 11 LT1083/LT1084/LT1085 Fixed Typical Applications High Efficiency Regulator Paralleling Regulators 1mH 28V INPUT 10,000µF 10k IN + OUTPUT LT1083-5 OUT VIN IN 2 FEET #18 WIRE* LT1083-5 OUT GND GND 470Ω MR1122 VOUT = 5V IOUT = 0A TO 15A 0.015Ω 1N914 28V IN LT1083-5 OUT *THE #18 WIRE ACTS AS BALLAST RESISTANCE INSURING CURRENT SHARING BETWEEN BOTH DEVICES GND 1k 1M 4N28 LT1083/4/5 TA04 10k + LT1011 LT1083/4/5 TA03 10k – 28V 1N914 7.5A Regulator T1 TRIAD F-269U L 1mH C30B 20Ω 3 110VAC 20Ω T2 1N4003 4 IN + C1 LT1083-12 OUT GND 50,000µF + 12V 0A TO 7.5A 100µF 2 1 LT1004-1.2 C30B 1N4003 1N4003 1N914 1µF 82k 16k* 560Ω 15k 15V 2 8 –15V 4 + 3 – 0.1µF 1 1N4148 7 8 100pF – 2N3904 3 1 8 LT1011 1 + 10k 2 15k REGULATOR WITH SCR PREREGULATOR TO LOWER POWER DISSIPATION. ABOUT 1.7V DIFFERENTIAL IS MAINTAINED ACROSS THE LT1083 INDEPENDENT OF LOAD CURRENT. 12 NC 15V –15V 4 * 1% FILM RESISTOR L-DALE TO-5 TYPE T2-STANCOR 11Z-2003 11k* 200k 7 LT1011 10k 16k* 15V 6 + 3 LM301A 7 15V – 4 –15V 2 11k* LT1083/4/5 TA05 1µF 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. K Package 2-Lead TO-3 Metal Can (LTC DWG # 05-08-1310) .760 – .775 (19.30 – 19.69) .320 – .350 (8.13 – 8.89) .060 – .135 (1.524 – 3.429) .420 – .480 (10.67 – 12.19) .038 – .043 (0.965 – 1.09) 1.177 – 1.197 (29.90 – 30.40) .655 – .675 (16.64 – 17.15) .210 – .220 (5.33 – 5.59) .425 – .435 (10.80 – 11.05) .151 – .161 (3.86 – 4.09) DIA, 2PLCS .167 – .177 (4.24 – 4.49) R .067 – .077 (1.70 – 1.96) .490 – .510 (12.45 – 12.95) R K2 (TO-3) 0801 OBSOLETE PACKAGE 1083ffe For more information www.linear.com/LT1083 13 LT1083/LT1084/LT1085 Fixed Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. T Package 3-Lead Plastic TO-220 T Package (LTC DWG # 05-08-1420) 3-Lead Plastic TO-220 (Reference LTC DWG # 05-08-1420) .147 – .155 (3.734 – 3.937) DIA .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) .230 – .270 (5.842 – 6.858) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .330 – .370 (8.382 – 9.398) .980 – 1.070 (24.892 – 27.178) .520 – .570 (13.208 – 14.478) .100 (2.540) BSC 14 .028 – .038 (0.711 – 0.965) .218 – .252 (5.537 – 6.401) .050 (1.270) TYP .013 – .023 (0.330 – 0.584) .095 – .115 (2.413 – 2.921) T3 (TO-220) 0801 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. M Package M Package 3-Lead Plastic DD Pak 3-Lead DD Pak (LTC DWG Plastic # 05-08-1460 Rev F) (Reference LTC DWG # 05-08-1460 Rev F) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° .060 (1.524) .183 (4.648) .330 – .370 (8.382 – 9.398) +.008 .004 –.004 +0.203 0.102 –0.102 ( .059 (1.499) ) .095 – .115 (2.413 – 2.921) .075 (1.905) .300 (7.620) +.012 .143 –.020 +0.305 3.632 –0.508 ( BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK ) DETAIL A .050 (1.270) .100 (2.54) BSC .013 – .023 (0.330 – 0.584) .050 ±.012 (1.270 ±0.305) DETAIL A 0° – 7° TYP .420 .080 .420 .350 0° – 7° TYP .276 .325 .205 .585 .585 .320 .090 .100 .090 .100 .070 RECOMMENDED SOLDER PAD LAYOUT NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE .070 M (DD3) 0212 REV F RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS 1083ffe For more information www.linear.com/LT1083 15 LT1083/LT1084/LT1085 Fixed Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. P Package P Package 3-Lead Plastic TO-3P (Similar to TO-247) 3-Lead Plastic (Similar (LTC DWG #TO-3P 05-08-1450 RevtoA)TO-247)) (Reference LTC DWG # 05-08-1450 Rev A) .515 – .580 (13.08 – 14.73) .305 – .370 (7.75 – 9.40) .560 – .620 (14.22 – 15.75) .187 – .207 (4.75 – 5.26) .620 – .640 (15.75 – 16.26) .265 – .293 (6.73 – 7.44) MOUNTING HOLE 18° – 22° .115 – .145 (2.92 – 3.68) DIA .819 – .870 (20.80 – 22.10) .060 – .081 (1.52 – 2.06) .170 – .215 (4.32 – 5.46) .635 – .720 (16.13 – 18.29) EJECTOR PIN MARKS .105 – .125 (2.67 – 3.18) DIA .580 – .600 (14.73 – 15.24) 3° – 7° .104 – .145 (2.64 – 3.68) .170 (4.32) MAX .780 – .800 (19.81 – 20.32) .042 – .052 (1.07 – 1.32) BOTTOM VIEW OF TO-3P HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED .030" (.762mm) .074 – .084 (1.88 – 2.13) .215 (5.46) BSC .113 – .123 (2.87 – 3.12) .087 – .102 (2.21 – 2.59) .020 – .040 (0.51 – 1.02) P3 0512 REV A OBSOLETE PACKAGE 16 1083ffe For more information www.linear.com/LT1083 LT1083/LT1084/LT1085 Fixed Revision History (Revision history begins at Rev E) REV DATE DESCRIPTION E 06/15 Obsolete TO-3P package. PAGE NUMBER 2, 16 1083ffe Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. For more information www.linear.com/LT1083 17 LT1083/LT1084/LT1085 Fixed Typical Application Adjusting Output Voltage VIN > 12V LT1085-5 + + 10µF + Regulator with Reference VIN > 11.5V 5V to 10V 100µF LT1085-5 + + 10µF 10V 100µF 5VOUT LT1029 1k 10µF* LT1083/4/5 TA07 LT1083/4/5 TA06 *OPTIONAL IMPROVES RIPPLE REJECTION Low Dropout Negative Supply Battery Backed Up Regulated Supply VIN IN VIN + LT1084-12 OUT GND + + 10,000µF 10µF 50Ω SELECT FOR CHARGE RATE 100µF LT1083/4/5 TA08 FLOATING INPUT 5.2V LINE 5.0V BATTERY LT1084-5 VOUT = –12V LT1084-5 6.5V + 10µF + 100µF LT1083/4/5 TA09 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1129 LT1175 LT1185 LT1529 LT1580 LT1581 LT1584/LT1585/ LT1587 700mA Micropower Low Dropout Regulator 500mA Negative Low Dropout Micropower Regulator 3A Negative Low Dropout Regulator 3A Low Dropout Regulator with 50µA IQ 7A, Very Low Dropout Regulator 10A, Very Low Dropout Regulator 7A/4.6A/3A Fast Response LDOs 50µA Quiescent Current 45µA IQ, 0.26V Dropout Voltage, SOT-223 Package VIN: –4.5V to –35V, 0.8V Dropout Voltage, DD-Pak and TO-220 Packages 500mV Dropout Voltage 0.54V Dropout at 7A, Fixed 2.5VOUT and Adjustable 0.63V Dropout at 10A, Fixed 2.5VOUT and Adjustable Fast Transient Response for Microprocessor Applications LT1761 Series 100mA, Low Noise, Low Dropout Micropower Regulators in SOT-23 150mA, Low Noise, LDO Micropower Regulators 500mA, Low Noise LDO Micropower Regulators 3A Low Noise Fast Transient Response LDO 300mA, Low Noise LDO Micropower Regulator 1.5A, Low Noise, Fast Transient Response LDO 200mA, Low Noise, Negative LDO 20µA Quiescent Current, 20µVRMS Noise, SOT-23 Package LT1762 Series LT1763 Series LT1764 LT1962 LT1963 LT1964 LT3015 LT3080/ LT3080-1 LT3090 25µA Quiescent Current, 20µVRMS Noise, MSOP Package 30µA Quiescent Current, 20µVRMS Noise, SO-8 Package 40µVRMS Noise, 5-Lead DD Package 20µVRMS Noise, MSOP Package 40µVRMS Noise, SOT-223 Package 340mV Dropout Voltage, Low Noise 30µVRMS, VIN = –1.8V to –20V, ThinSOT™ and 3mm × 3mm DFN-8 Packages 1.5A, Low Noise, Negative Linear Regulator with Precision VIN: –1.8V to –30V, VOUT: –1.22V to –29.5V, Dropout Voltage: 310mV, Precision Current Limit Current Limit with Foldback, Low Output Noise: 60μVRMS (10Hz to 100kHz), TO-220, DD-Pak, DFN and MSOP Packages 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator 300mV Dropout Voltage (2-Supply Operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V, VOUT: 0V to 35.7V, Stable with Ceramic Caps, TO-220, DD-Pak, SOT-223, MS8E and 3mm × 3mm DFN-8 Packages; "-1" Version Has Integrated Internal Ballast Resistor 600mA Low Noise Negative LDO with Programmable ILIMIT 300mV Dropout Voltage, 18µVRMS Output Voltage Noise, Parallelable 50μA SET Pin Current: ±1% Initial Accuracy, Positive/Negative Current Monitors Wide Input Voltage Range: –1.5V to –36V, Rail-to-Rail Output Voltage Range: 0V to –32V 18 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT1083 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LT1083 1083ffe LT 0615 REV E • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1994