Revised June 2005 LM317 3-Terminal Positive Adjustable Regulator General Description Features 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. ■ 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 ■ D2 PAK Package Ordering Code: Product Number Package Operating Temperature LM317T TO-220 0qC to 125qC LM317D2TXM D2 PAK 0qC to 125qC Connection Diagrams Internal Block Diagram © 2005 Fairchild Semiconductor Corporation DS400281 www.fairchildsemi.com LM317 3-Terminal Positive Adjustable Regulator March 2000 LM317 Absolute Maximum Ratings Symbol Value Input-Output Voltage Differential Parameter VI - VO 40 V Lead Temperature TLEAD 230 qC Power Dissipation PD Internally limited W Operating Junction Temperature Range Tj 0 a 125 TSTG 65 a 125 r0.02 qC qC % / qC Storage Temperature Range 'VO/'T Temperature Coefficient of Output Voltage Unit 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 Characteristic (VI - VO 5V, IO 0.5A, 0qC d TJ d 125qC, IMAX Parameter Line Regulation (Note 2) 1.5A, PDMAX Symbol Rline 20W, unless otherwise specified) Conditions TA 25qC 3V d VI VO d 40V 3V d VI VO d 40V Load Regulation (Note 2) Rload TA Min Typ Max Unit –– 0.01 0.04 %/V – 0.02 0.07 %/V – 18.0 25.0 mV% / VO 0.4 0.5 40.0 70.0 0.8 1.5 – 46.0 100 PA – 2.0 5.0 PA 1.20 1.25 1.30 V – 0.7 – % / VO – 3.5 12.0 mA 1.0 2.2 0.3 – A – 0.003 0.01 % / VO 66.0 60.0 – 25qc, 10mA d IO d IMAX VO 5V VO t 5V 10mA d IO d IMAX VO 5V – VO t 5V Adjustable Pin Current IADJ Adjustable Pin Current Change 'IADJ – 3V d VI VO d 40V 10mA d IO d IMAX PD d PMAX Reference Voltage VREF mV% / VO 3V d VIN - VO d 40V 10mA d IO d IMAX PD d PMAX Temperature Stability STT – Minimum Load Current to Maintain Regulation IL(MIN) VI - VO 40V Maximum Output Current IO(MAX) VI - VO d 15V, PD d PMAX VI - VO d 40V, PD d PMAX TA 25qC RMS Noise,% of VOUT eN TA 25qC, 10Hz d f d 10KHz Ripple Rejection RR VO 10V, f CADJ Long-Term Stability, TJ THIGH Thermal Resistance Junction to Case ST TA 120Hz without CADJ 10PF (Note 3) 75.0 25qC for end point measurements, 1000HR – RTJC dB – 0.3 1.0 % – 5.0 – qC / W 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 20S) Note 3: CADJ, when used, is connected between the adjustment pin and ground. www.fairchildsemi.com 2 LM317 Typical Performance Characteristics FIGURE 1. Load Regulation FIGURE 2. Adjustment Current FIGURE 3. Dropout Voltage FIGURE 4. Reference Voltage Typical Application Note: Ci is required when regulator is located an appreciable distance from power supply filter. Note: Co is not needed for stability, however, it does improve transient response. Note: Since IADJ is controlled to less than 100PA, the error associated with this term is negligible in most applications. FIGURE 5. Programmable Regulator 3 www.fairchildsemi.com LM317 Physical Dimensions inches (millimeters) unless otherwise noted www.fairchildsemi.com 4 LM317 3-Terminal Positive Adjustable Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications. 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: 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. 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 to the user. www.fairchildsemi.com 5 www.fairchildsemi.com