LM117/217 LM317 1.2V TO 37V ADJUSTABLE VOLTAGE REGULATOR .. .. . OUTPUT VOLTAGE RANGE : 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 1.5A (0.5A for TO-39) 0.1% LINE AND LOAD REGULATION FLOATING OPERATION FOR HIGH VOLTAGES COMPLETE SERIES OF PROTECTIONS : CURRENT LIMITING, THERMAL SHUTDOWN AND SOA CONTROL TO-3 DESCRIPTION The LM117/LM217/LM317 are monolithic integrated circuit in TO-220 and TO-3 packages intended for use as positive adjustable voltage regulators. They are designed to supply more than 1.5A of load current with an output voltage adjustable over a 1.2 to 37V range. TO-220 TO-39 The nominal output voltage is selected by means of only a resistive divider, making the device exceptionally easy to use and eliminating the stocking of many fixed regulators. ABSOLUTE MAXIMUM RATING Symbol Vi-o IO Parameter Value Unit 40 V Input-output Differential Voltage Output Current Top Operating Junction Temperature for: P tot Power Dissipation Intenrally Limited LM117 LM217 LM317 o -55 to 150 -25 to 150 0 to 125 C C o C o Internally Limited THERMAL DATA Rthj-case Thermal Resistance Junction-case Rthj-amb Thermal Resistance Junction-ambient March 1993 Max Max TO-3 TO-220 ISOWATT220 TO-39 4 35 3 50 4 60 15 160 o o C/W C/W 1/10 LM117/LM217/LM317 PIN CONNECTION AND ORDERING NUMBER TO-220 TO-3 TO-3 pin 1 = INPUT pin2 = ADJ pin3 = OUTPUT Type TO-3 LM117 LM117K LM217 LM217K LM217T LM217P LM217H LM317 LM317K LM317T LM317P LM317H SCHEMATIC DIAGRAM 2/10 TO-220 ISOWATT220 TO-39 LM117H LM117/LM217/LM317 Basic adjustable regulator. ELECTRICAL CHARACTERISTICS (Vi - Vo = 5 V, I o = 500 mA for TO-3 and TO-220, I o = 100 mA for TO-39, I MAX and P MA X according note 2, unless otherwise specified) Symbol Parameter Test Conditions LM117/LM217 Min. Max. Typ. Max. 0.01 0.02 0.01 0.04 %/V 0.02 0.05 0.02 0.07 %/V 5 15 5 25 mV 20 70 mV 0.1 0.5 % 0.3 1.5 % 100 50 100 µA 0.2 5 0.2 5 µA 1.25 1.3 1.25 1.3 V Line Regulation V i - Vo = 3 to 40 V Tj = 25 oC ∆Vo Load Regulation V o ≤ 5V Io = 10 mA to IMAX Tj = 25 oC 20 50 V o ≥ 5V Io = 10 mA to IMAX Tj = 25 oC 0.1 0.3 0.3 1 50 Adjustment Pin Current ∆IADJ Adjustment Pin Current V i - Vo = 2.5 to 40 V Io = 10 mA to IMAX VREF Reference Voltage (between pin 3 and pin 1) V i - Vo = 2.5 to 40 V Io = 10 mA to IMAX P D ≤ PMAX ∆Vo Vo Output Voltage Temperature Stability Io(min) Minimum Load Current V i - Vo = 40 V Io(max) Maximum Load Current V i - Vo ≤ 15 V P D < PMAX SVR 3.5 TO-3 TO-220 1.5 TO-39 0.5 Tj = 25 oC f = 120 Hz 1 5 3.5 2.2 1.5 0.8 0.5 % 10 2.2 mA A 0.8 A TO-3 TO-220 0.4 0.4 A TO-39 0.07 0.07 A 0.003 0.003 % 65 65 dB 80 dB Output Noise Voltage B = 10Hz to 10KHz (percentance of VO) Tj = 25 oC Supply Voltage Rejection (*) 1.2 1 V i - Vo = 40 V P D < PMAX Tj = 25 oC eN 1.2 Min. Unit Typ. ∆Vo IADJ LM317 CADJ=0 CADJ=10µF 66 80 66 (*) CADJ is connected between pin 1 and ground. Note: (1) Unless otherwise specified the above specs, apply over the following conditions : LM 117 Tj = – 55 to 150°C; LM 217 Tj = – 25 to 150°C ; LM 317 Tj = 0 to 125°C. (2) IMAX: 1.5 A for TO-3 and TO-220; 0.5 A for TO-39 PMAX: 20 W for TO-3 and TO-220; 2 W for TO-39 3/10 LM117/LM217/LM317 Figure 1 : Output Current vs. Input-output Differential Voltage. Figure 2 : Dropout Voltage vs. Junction Temperature. Figure 3 : Reference Voltage vs. Junction Figure 4 : Basic Adjustable Regulator. APPLICATION INFORMATION The LM117/217/317 provides an internal reference voltage of 1.25V between the output and adjustments terminals. This is used to set a constant current flow across an external resistor divider (see fig. 4), giving an output voltage VO of: VO = VREF (1 + R2 ) + IADJ R2 R1 The device was designed to minimize the term IADJ (100µA max) and to maintain it very constant with line and load changes. Usually, the error term IADJ ⋅ R2 can be neglected. To obtain the previous requirement, all the regulator quiescent current is returned to the output terminal, imposing a minimum load current condition. If the load is insufficient, the output voltage will rise. Since the LM117/217317 is a floating regulator and ”sees” only the input-to-output differential voltage, 4/10 supplies of very high voltage with respect to ground can be regulated as long as the maximum input-tooutput differential is not exceeded. Furthermore, programmable regulator are easily obtainable and, by connecting a fixed resistor between the adjustment and output, the device can be used as a precision current regulator. In order to optimise the load regulation, the current set resistor R1 (see fig. 4) should be tied as close as possible to the regulator, while the ground terminal of R2 should be near the ground of the load to provide remote ground sensing. No external capacitors are required, but performance may be improved with added capacitance as follow: An input bypass capacitor of 0.1 µF LM117/LM217/LM317 An adjustment terminal to ground 10 mF capacitor to improve the ripple rejection of about 15 dB (CADJ). An 1mF tantalium capacitor on the output to improve transient response. In additional to external capacitors, it is good prac- tice to add protection diodes, as shown in fig.5. D1 protect the device against input short circuit, while D2 protect against output short circuit for capacitance discharging. Figure 5 : Voltage Regulator with Protection Diodes. D1 protect the device against input short circuit, while D2 protects against output short circuit for capacitors discharging Figure 6 : Slow Turn-on 15V Regulator. Figure 7 : Current Regulator. Io = Vref 1.25V + IADJ ≈ R1 R1 5/10 LM117/LM217/LM317 Figure 8 : 5V Electronic Shut-down Regulator. Figure 9 : Digitally Selected Outputs. (R2 sets maximum Vo ) Figure 10 : Battery Charger (12V). * RS sets output impedance of charger R2 Zo = RS (1 + ) R1 Use of RS allows low charging rates with fully charged battery. 6/10 Figure 11 : Current Limited 6V Charger. * R3 sets peak current (0.6A for 1Ω). ** C1 recommended to filter out input transients. LM117/LM217/LM317 TO-3 MECHANICAL DATA mm DIM. MIN. inch TYP. MAX. MIN. TYP. MAX. A 11.00 13.10 0.433 0.516 B 0.97 1.15 0.038 0.045 C 1.50 1.65 0.059 0.065 D 8.32 8.92 0.327 0.351 E 19.00 20.00 0.748 0.787 G 10.70 11.10 0.421 0.437 N 16.50 17.20 0.649 0.677 P 25.00 26.00 0.984 1.023 R 4.00 4.09 0.157 0.161 U 38.50 39.30 1.515 1.547 V 30.00 30.30 1.187 1.193 A P C O N B V E G U D R P003F 7/10 LM117/LM217/LM317 TO-220 MECHANICAL DATA mm DIM. MIN. inch MAX. MIN. A 4.40 TYP. 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 D1 TYP. MAX. 0.107 1.27 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 0.409 16.4 0.645 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.2 15.9 0.598 0.625 L7 6.2 6.6 0.244 0.260 L9 3.5 4.2 0.137 0.165 DIA. 3.75 3.85 0.147 0.151 D1 C D A E L4 H2 G G1 F1 L2 F2 F Dia. L5 L9 L7 L6 L4 P011C 8/10 LM117/LM217/LM317 TO39 MECHANICAL DATA mm inch DIM. MIN. A TYP. MAX. MIN. 12.7 TYP. MAX. 0.500 B 0.49 0.019 D 6.6 0.260 E 8.5 0.334 F 9.4 0.370 G 5.08 0.200 H 1.2 0.047 I 0.9 0.035 45o (typ.) L D A G I E F H B L P008B 9/10 LM117/LM217/LM317 Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. 1994 SGS-THOMSON Microelectronics - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A 10/10