LESHAN RADIO COMPANY, LTD. LR1084 General Description Features The LR1084 is a series of low dropout positive voltage regulators with a maximum dropout of 1.5V at 5A of load current. g g g g g The series features on-chip thermal limiting which provides protection against any combination of overload and ambient temperatures that would create excessive junction temperatures. It also includes a trimmed bandgap reference and a current limiting circuit. The LR1084 is available in 1.5V, 1.8V, 2.5V, 2.85V, 3.3V and 5.0Vversions. The fixed versions integrate the adjust resistors. It is also available in an adjustable version which can set the output voltage with two external resistors. The LR1084 series is available in standard packages of TO-263-2L, TO-263-3L, TO-220 and TO-252. TO-263-3L TO-263-2L g g Low Dropout Voltage: 1.3V Typically at 5A Current Limiting and Thermal Protection Output Current: 5A Current Limit: 6.5A Operating Junction Temperature Range: 0 to 125oC Line Regulation: 0.015% (Typical) Load Regulation: 0.2% (Typical) Applications g g g g g High Efficiency Linear Regulators Battery Chargers Post Regulation for Switching Supply Microprocessor Supply Desktop PCs, RISC and Embedded Processors' Supply TO-252 TO-220 Figure 1. Package Types of LR1084 1/11 LESHAN RADIO COMPANY, LTD. LR1084 Pin Configuration T Package (TO-220) D Package (TO-252) 3 INPUT 2 OUTPUT 1 ADJ/GND 3 INPUT 2 OUTPUT 1 ADJ/GND S Package S Package (TO-263-3L) (TO-263-2L) 3 INPUT 3 2 OUTPUT 2 OUTPUT (TAB) 1 ADJ/GND 1 ADJ/GND INPUT Figure 2. Pin Configuration of LR1084 (Top View) 2/11 LESHAN RADIO COMPANY, LTD. LR1084 Absolute Maximum Ratings (Note 1) Parameter Symbol Max Unit 150 oC 150 o TLEAD 300 o ESD 2000 V Operating Junction Temperature Range TJ Storage Temperature Range TS Lead Temperature (Soldering, 10 sec.) ESD (Human Body Model) Min -65 C C Note 1:Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under"Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Parameter Input Voltage Operating Junction Temperature Range Symbol Min VIN TJ 0 Max Unit 12 V 125 o C 3/11 LESHAN RADIO COMPANY, LTD. LR1084 Electrical Characteristics Typicals and limits appearing in normal type apply for TJ = 25oC. Limits appearing in Boldface type apply over the entire operating junvtion temperature range. Parameter Reference Voltage Output Voltage Line Regulation Symbol VREF VOUT 'VOUT Conditions Min Typ Max Unit LR1084-ADJ, IOUT = 10mA, VIN -VOUT = 3V, 10mA d IOUT d 5A, 1.5V d VIN - VOUT d5V 1.238 1.225 1.250 1.250 1.262 1.270 V V LR1084-1.5, IOUT = 0mA, VIN = 4.5V, 10mAd IOUT d 5A, 3.1Vd VIN d 6V 1.485 1.47 1.5 1.5 1.515 1.53 LR1084-1.8, IOUT = 0mA, VIN = 4.8V, 10mAd IOUT d 5A, 3.4Vd VIN d 6V 1.782 1.764 1.8 1.8 1.818 1.836 LR1084-2.5, IOUT = 0mA, VIN = 5.5V, 10mAd IOUT d 5A, 4.1Vd VIN d 7V 2.475 2.45 2.5 2.5 2.525 2.55 LR1084-2.85, IOUT = 0mA, VIN = 6V, 10mAd IOUT d 5A, 4.5Vd VIN d 8V 2.822 2.793 2.85 2.85 2.879 2.907 LR1084-3.3, IOUT = 0mA, VIN = 6.3V, 10mAd IOUT d 5A, 4.9Vd VIN d 8V 3.267 3.234 3.3 3.3 3.333 3.366 LR1084-5.0, IOUT = 0mA, VIN = 8V, 10mAd IOUT d 5A, 6.6Vd VIN d 10V 4.95 4.9 5 5 5.05 5.1 LR1084-ADJ, IOUT = 10mA, 2.85V d VIN d 10V 0.015 0.035 0.2 0.2 % LR1084-1.5, IOUT = 10mA, 3.1V d VIN d 10V 0.5 1 6 6 mV LR1084-1.8, IOUT = 10mA, 3.4V d VIN d 10V 0.5 1 6 6 mV LR1084-2.5, IOUT = 10mA, 4.1V d VIN d 10V 0.5 1 6 6 mV LR1084-2.85, IOUT = 10mA, 4.5V d VIN d 10V 0.5 1 6 6 mV LR1084-3.3, IOUT = 10mA, 4.9V d VIN d 10V 0.5 1 6 6 mV LR1084-5.0, IOUT = 10mA, 6.6V d VIN d 10V 0.5 1 10 10 mV 4/11 LESHAN RADIO COMPANY, LTD. LR1084 Electrical Characteristics (Continued) Typicals and limits appearing in normal type apply for TJ = 25oC. Limits appearing in Boldface type apply over the entire operating junvtion temperature range. Parameter Symbol Conditions Load Regulation 'VOUT Dropout Voltage Current Limit ILIMIT Typ Max Unit LR1084-ADJ, 0mAd I OUT d 5A, VIN - VOUT = 3V 0.1 0.2 0.3 0.4 % LR1084-1.5, 0mAd I OUT d 5A, VIN - VOUT = 3V 3 7 15 20 mV LR1084-1.8, 0mAd I OUT d 5A, VIN - VOUT = 3V 3 7 15 20 mV LR1084-2.5, 0mAd I OUT d 5A, VIN - VOUT = 3V 3 7 15 20 mV LR1084-2.85, 0mAd I OUT d 5A, VIN - VOUT = 3V 3 7 15 20 mV LR1084-3.3, 0mAd I OUT d 5A, VIN - VOUT = 3V 3 7 15 20 mV LR1084-5.0, 0mAd I OUT d 5A, VIN - VOUT = 3V 5 10 20 35 mV IO = 5A, 'VREF,'VOUT= 1% 1.3 1.5 V VIN - VOUT = 3V, Min 5.5 6.5 A Minimum Load Current VIN = 10V (LR1084-ADJ) 3 10 mA Quiescent Current VIN = 10V (LR1084) 5 10 mA Ripple Rejection fRIPPLE = 120Hz, COUT = 25PF Tantalum, IOUT = 5A, VIN - VOUT = 3V Adjust Pin Current VIN = 4.25V, IOUT = 10mA 55 120 Adjust Pin Current Change 10mA dIOUT d5A, 1.5Vd (VIN -VOUT) d 4.5V 0.2 5 Temperature Stability IOUT = 10mA, VIN - VOUT = 1.5 0.5 % Long Term Stability TA = 125oC, 1000Hrs 0.5 % RMS Noise (% of VOUT) 10Hz df d10kHz 0.003 % Thermal Resistance Junction -to-Case QJC TO-263 TO-220 TO-252 60 72 3 3 dB PA PA 0C /W 5/11 LESHAN RADIO COMPANY, LTD. LR1084 Typical Performance Characteristics 1.50 2.53 1.45 1.40 2.52 Output Voltage(V) Dropout Voltage(V) 1.35 1.30 1.25 1.20 1.15 1.10 1.05 2.51 2.50 2.49 1.00 0.95 2.48 0.90 0.85 0.80 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 2.47 5.0 0 25 50 75 100 125 o TJ( C) Output Current(A) Figure 3. Dropout Voltage vs. Output Current Figure 4. Output Voltage vs. Temperature 80 0.0 75 70 65 60 -0.4 Iadj(uA) Line regulation(mV) -0.2 -0.6 55 50 45 40 35 -0.8 30 25 -1.0 0 25 50 75 100 125 o TJ( C) Figure 5. Line Regulation vs. Temperature 20 0 1 2 3 4 Io(A) ADJUST PIN CURRENT VS. OUTPUT CURRENT 5 Figure 6. Adjust Pin Current vs. Output Current 6/11 LESHAN RADIO COMPANY, LTD. LR1084 Typical Performance Characteristics (Continued) 1.40 8 Short Circuit Current(A) Dropout Voltage(V) 7 1.35 1.30 1.25 6 5 4 3 2 1 1.20 0 25 50 75 100 o TJ( C) Figure 7. Dropout Voltage vs. Temperature Figure 9. Load Transient Response 125 0 0 2 4 6 8 10 12 Dropout Voltage(V) Short Circuit Current vs Dropout Voltage Figure 8. Short Circuit Current vs. Dropout Voltage Figure 10. Line Transient Response 7/11 LESHAN RADIO COMPANY, LTD. LR1084 Typical Applications Adjustable Output Voltage V OUT =V REF *(1+R2/R1)+I ADJ *R2 Or V OUT =V REF (1+R2/R1) , V REF =1.25V VIN 3 2 LR1084-XX IN VOUT OUT 22UF 10UF 1 Fig 11. Fixed Output Regulator VIN 3 VOUT=1.25V 2 IN LR1084-ADJ OUT ADJ 10UF 22UF 1 R1 120 FIG 12 . Adjustable Output 1.25 Voltage Application Circuit VIN 3 VOUT 2 IN LR1084-ADJ OUT ADJ 10UF 22UF 1 R1 120 VREF R2 FIG 13 . Adjustable Output Voltage Application Circuit VIN 3 10UF VOUT 2 IN LR1084-ADJ OUT ADJ 22UF 1 R1 120 R2 VREF 10UF FIG 14 . Adjustable Output Voltage Application with improved Ripple Rejection 8/11 LESHAN RADIO COMPANY, LTD. LR1084 Mechanical Dimensions TO-263-3L TO-263 Unit: mm e f e e f f e e e fe f f f f efe 9/11 LESHAN RADIO COMPANY, LTD. LR1084 Mechanical Dimensions (Continued) TO-263-2L Unit: mm e f e f f f e f f f e e e fe efe 10/11 LESHAN RADIO COMPANY, LTD. LR1084 Mechanical Dimensions (Continued) TO-220 Unit: mm f ¶f f f f e f e f e f f f e e f 11/11