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| www.fairchildsemi.com LM317 3-Terminal Positive Adjustable Regulator Features * * * * * * Output Current In Excess of 1. 5A Output Adjustable Between 1. 2V and 37V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe Operating Area Compensation TO-220 Package Description This monolithic integrated circuit is an adjustable 3-terminal positive voltage regulator designed to supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V. It employs internal current limiting, thermal shut-down and safe area compensation. TO-220 1 1. Adj 2. Output 3. Input Internal Block Diagram Vin Input 3 + - Voltage Reference Protection Circuitry Rlimit 2 Vo Output 1 Adj Vadj Rev. 1.0.0 (c)2001 Fairchild Semiconductor Corporation LM317 Absolute Maximum Ratings Parameter Input-Output Voltage Differential Lead Temperature Power Dissipation Operating Junction Temperature Range Storage Temperature Range Temperature Coefficient of Output Voltage Symbol V I - VO TLEAD PD Tj TSTG Vo/T Value 40 230 Internally limited 0 ~ +125 -65 ~+125 0.02 Unit V C W C C %/C Electrical Characteristics (VI-VO=5V, IO= 0.5A, 0C TJ + 125C, IMAX = 1.5A, PDMAX = 20W, unless otherwise specified) Parameter Line Regulation (Note1) Symbol Rline Conditions TA = +25C 3V VI - VO 40V 3V VI - VO 40V TA = +25C, 10mA IO IMAX VO< 5V VO 5V 10mA IO IMAX VO < 5V VO 5V 3V VI - VO 40V 10mA IO IMAX PD PMAX 3V VIN - VO 40V 10mA IO IMAX PD PMAX VI - VO = 40V VI - VO 15V, PD PMAX VI - VO 40V, PD PMAX TA=25C TA= +25C, 10Hz f 10KHz VO = 10V, f = 120Hz without CADJ CADJ = 10F (Note2) TA = +25C for end point measurements, 1000HR Min Typ. 0.01 0.02 18 0.4 40 0.8 46 2.0 1.25 0.7 3.5 2.2 0.3 0.003 60 75 0.3 5 Max. 0.04 0.07 25 0.5 70 1.5 100 5 1.30 12 0.01 1 Unit %/V %/V mV% / VO Load Regulation (Note1) Rload 1.20 1.0 66 - mV% / VO A A V % / VO mA A % / VO dB % C / W Adjustable Pin Current Adjustable Pin Current Change Reference Voltage Temperature Stability Minimum Load Current to Maintain Regulation Maximum Output Current RMS Noise, % of VOUT Ripple Rejection Long-Term Stability, TJ = THIGH Thermal Resistance Junction to Case IADJ IADJ VREF STT IL(MIN) IO(MAX) eN RR ST RJC Note: 1. Load and line regulation are specified at constant junction temperature. Change in VD due to heating effects must be taken into account separately. Pulse testing with low duty is used. (PMAX = 20W) 2. CADJ, when used, is connected between the adjustment pin and ground. 2 LM317 Typical Perfomance Characteristics OUTPUT VOLTAGE DEVIATION(%) TEMPERATURE (C) ADJUSTMENT CURRENT(uA) TEMPERATURE (C) Figure 1. Load Regulation Figure 2. Adjustment Current INPUT-OUTPUT DIFFERENTIAL(V) REFERENCE VOLTAGE(V) TEMPERATURE (C) TEMPERATURE (C) Figure 3. Dropout Voltage Figure 4. Reference Voltage 3 LM317 Typical Application VI Input Ci 0. 1F VI LM317 KA317 Vadj Vo Output R1 Iadj R2 I adj Co 1F VO = 1.25V (1+ R 2/ R1)+Iadj R2 Figure 5. Programmable Regulator Ci is required when regulator is located an appreciable distance from power supply filter. Co is not needed for stability, however, it does improve transient response. Since IADJ is controlled to less than 100A, the error associated with this term is negligible in most applications. 4 LM317 Mechanical Dimensions Package TO-220 9.90 0.20 4.50 0.20 1.30 0.10 2.80 0.10 (8.70) o3.60 0.10 (1.70) 1.30 -0.05 +0.10 9.20 0.20 (1.46) 13.08 0.20 (1.00) (3.00) 15.90 0.20 1.27 0.10 1.52 0.10 0.80 0.10 2.54TYP [2.54 0.20] 2.54TYP [2.54 0.20] 10.08 0.30 18.95MAX. (3.70) (45 ) 0.50 -0.05 +0.10 2.40 0.20 10.00 0.20 5 LM317 Ordering Information Product Number LM317T Package TO-220 Operating Temperature 0C to + 125C 6 LM317 7 LM317 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 6/1/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
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