www.fairchildsemi.com LM317 3-Terminal Positive Adjustable Regulator Features 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 1.2V to 37V. It employs internal current limiting, thermal shut-down and safe area compensation. 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 TO-220 Output 1 1. Adj 2. Output 3. Input Internal Block Diagram Vin 3 Input + - Voltage Reference Protection Circuitry Rlimit 2 Vo Output 1 Adj Vadj Rev. 1.0.4 (c)2009 Fairchild Semiconductor Corporation LM317 Absolute Maximum Ratings Parameter Symbol Value Unit Input-Output Voltage Differential VI - VO 40 V Lead Temperature TLEAD 230 C Power Dissipation PD Internally limited W Operating Junction Temperature Range Tj 0 ~ +125 C TSTG -65 ~ +125 C Vo/T 0.02 %/C Storage Temperature Range Temperature Coefficient of Output Voltage Note 1: Absolute Maximum Ratings: are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation. Electrical Characteristics (VI-VO = 5V, IO = 0.5A, 0C TJ +125C, IMAX = 1.5A, PDMAX = 20W, unless otherwise specified) Parameter Line Regulation (Note2) Load Regulation (Note2) Symbol Rline Rload Min. Typ. Max. Unit TA = +25C 3V VI - VO 40V Conditions - 0.01 0.04 %/ V 3V VI - VO 40V - 0.02 0.07 %/ V TA = +25C, 10mA IO IMAX VO< 5V VO 5V - 18 0.4 25 0.5 mV%/VO 10mA IO IMAX VO < 5V VO 5V - 40 0.8 70 1.5 mV%/VO IADJ - - 46 100 A Adjustable Pin Current Change IADJ 3V VI - VO 40V 10mA IO IMAX PD PMAX - 2.0 5 A Reference Voltage VREF 3V VIN - VO 40V 10mA IO IMAX PD PMAX 1.20 1.25 1.30 V - 0.7 - %/VO - 3.5 12 mA 1.5 - 2.2 0.3 - A - 0.003 0.01 %/VO 66 60 75 - dB - 0.3 1 % - 5 - C/W Adjustable Pin Current Temperature Stability STT - Minimum Load Current to Maintain Regulation IL(MIN) VI - VO = 40V Maximum Output Current IO(MAX) VI - VO 15V, PD PMAX VI - VO 40V, PD PMAX TA=25C eN TA= +25C, 10Hz f 10kHz Ripple Rejection RR VO = 10V, f = 120Hz without CADJ CADJ = 10F (Note3) Long-Term Stability, TJ = THIGH ST TA = +25C for end point measurements, 1000HR RMS Noise, % of VOUT Thermal Resistance Junction to Case RJC - Note 2: 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) Note 3: CADJ, when used, is connected between the adjustment pin and ground. 2 LM317 ADJUSTMENT CURRENT(uA) OUTPUT VOLTAGE DEVIATION(%) Typical Performance Characteristics TEMPERATURE (C) TEMPERATURE (C) Figure 2. Adjustment Current REFERENCE VOLTAGE(V) INPUT-OUTPUT DIFFERENTIAL(V) Figure 1. Load Regulation TEMPERATURE (C) Figure 3. Dropout Voltage TEMPERATURE (C) Figure 4. Reference Voltage 3 LM317 Typical Application VI Input Ci 0. 1F VI LM317 KA317 Output Vo Vadj R1 I adj Co 1F R2 I adj 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 Dimensions in millimeters TO-220 [ SINGLE GAUGE ] 5 LM317 Ordering Information Product Number Package Operating Temperature LM317T TO-220 0C to +125C 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. 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. www.fairchildsemi.com 11/19/09 0.0m 001 Stock#DS400281 (c) 2009 Fairchild Semiconductor Corporation