LM217L LM317L LOW CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR ■ ■ ■ ■ ■ ■ ■ ■ OUTPUT VOLTAGE RANGE: 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 100 mA LINE REGULATION TYP. 0.01% LOAD REGULATION TYP. 0.1% THERMAL OVERLOAD PROTECTION SHORT CIRCUIT PROTECTION OUTPUT TRANSISTOR SAFE AREA COMPENSATION FLOATING OPERATION FOR HIGH VOLTAGE APPLICATIONS DESCRIPTION The LM217L/LM317L are monolithic integrated circuit in SO-8 and TO-92 packages intended for use as positive adjustable voltage regulators. They are designed to supply until 100 mA of load current with an output voltage adjustable over a 1.2 to 37V range. The nominal output voltage is selected by means of only a resistive divider, making the device TO-92 SO-8 exceptionally easy to use and eliminating the stocking of many fixed regulators SCHEMATIC DIAGRAM February 2003 1/10 LM217L/LM317L ABSOLUTE MAXIMUM RATINGS Symbol VI - VO Pd Topr Tstg Parameter² Value Unit 40 V Input-Output Differential Voltage Power Dissipation Internally Limited Operating Junction Temperature for LM217L Range for LM317L Storage Temperature Range -40 to 125 0 to 125 °C -55 to 150 °C CONNECTION DIAGRAM (top view) PIN 1 = ADJUST PIN 2 = IN PIN 3 = OUT SO-8 BOTTOM VIEW TO-92 ORDERING CODES TYPE SO-8 TO-92 LM217L LM317L LM217LD LM317LD LM217LZ LM317LZ TEST CIRCUIT 2/10 LM217L/LM317L ELECTRICAL CHARACTERISTICS OF LM217L (refer to the test circuits, TJ = - 40 to 125°C, VI - VO = 5 V, IO = 40 mA, unless otherwise specified). Symbol ∆VO ∆VO Parameter Line Regulation Load Regulation Test Conditions 0.02 %/V VO ≤ 5 V IO = 5 to 100 mA TJ = 25°C 0.02 5 0.05 15 mV VO ≥ 5 V IO = 5 to 100 mA TJ = 25°C 20 0.1 50 0.3 % 0.3 50 1 100 µA 0.2 5 µA 1.25 1.3 V Adjustment Pin Current VI - VO = 3 to 40 V IO = 5 to 100 mA Pd < 625 mW VREF Reference Voltage VI - VO = 3 to 40 V IO = 10 to 500 mA Pd < 625 mW 1.2 0.7 VI - VO = 40 V SVR Output Noise Voltage 100 5 200 mA mA 50 B = 10 Hz to 10 KHzTJ = 25°C Supply Voltage Rejection (*) TJ = 25°C f = 120 Hz % 3.5 VI - VO = 3 to 13 V VI - VO = 40 V eN Unit 0.01 ∆IADJ Maximum Output Current Max. TJ = 25°C Adjustment Pin Current IO(max) Typ. VI - VO = 3 to 40 V IL < 20 mA IADJ ∆VO/VO Output Voltage Temperature Stability IO(min) Minimum Load Current Min. CADJ = 0 CADJ = 10 µF 66 0.003 % 65 dB 80 (*) CADJ is connected between Adjust pin and Ground. ELECTRICAL CHARACTERISTICS OF LM317L (refer to the test circuits, TJ = 0 to 125°C, VI - VO = 5 V, IO = 40 mA, unless otherwise specified). Symbol Typ. Max. Unit ∆VO Line Regulation Parameter VI - VO = 3 to 40 V IL < 20 mA Test Conditions TJ = 25°C 0.01 0.04 %/V ∆VO Load Regulation VO ≤ 5 V IO = 5 to 100 mA TJ = 25°C 0.02 5 0.07 25 mV VO ≥ 5 V IO = 5 to 100 mA TJ = 25°C 20 0.1 70 0.5 % 0.3 50 1.5 100 µA 0.2 5 µA 1.25 1.3 V IADJ Adjustment Pin Current ∆IADJ Adjustment Pin Current VI - VO = 3 to 40 V IO = 5 to 100 mA Pd < 625 mW VREF Reference Voltage VI - VO = 3 to 40 V IO = 5 to 100 mA Pd < 625 mW ∆VO/VO Output Voltage Temperature Stability IO(min) Minimum Load Current IO(max) Maximum Output Current Min. 1.2 0.7 VI - VO = 40 V 3.5 VI - VO = 3 to 13 V 100 VI - VO = 40 V eN SVR Output Noise Voltage 5 mA mA 50 B = 10 Hz to 10 KHzTJ = 25°C Supply Voltage Rejection (*) TJ = 25°C f = 120 Hz 200 % CADJ = 0 CADJ = 10 µF 66 0.003 % 65 dB 80 (*) CADJ is connected between Adjust pin and Ground. 3/10 LM217L/LM317L Figure 1 : Current Limit Figure 2 : Minimum Operating Current APPLICATION INFORMATION The LM317L 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/R1) + IADJ R2 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 LM317L is a floating regulator and "sees" only the input-to-output differential voltage, supplies of very high voltage with respect to ground can be regulated as long as the maximum input-to-output 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 optimize 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. Figure 3 : Basic Adjustable Regulator 4/10 LM217L/LM317L Figure 4 : Voltage Regulator with Protection Diodes Figure 5 : Slow Turn-on 15V Regulator Figure 6 : Current Regulator Vref 1.25V IO = + IADJ ≈ R1 R1 5/10 LM217L/LM317L Figure 7 : 5V Electronic Shut-down Regulator Figure 8 : Digitally Selected Outputs (R2 = sets maximum VO) 6/10 LM217L/LM317L SO-8 MECHANICAL DATA DIM. mm. MIN. TYP inch MAX. MIN. TYP. MAX. A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 8˚ (max.) 0.1 0.04 0016023/C 7/10 LM217L/LM317L TO-92 MECHANICA DATA mm. mils DIM. MIN. TYP MAX. MIN. TYP. MAX. A 4.32 4.95 170.1 194.9 b 0.36 0.51 14.2 20.1 D 4.45 4.95 175.2 194.9 E 3.30 3.94 129.9 155.1 e 2.41 2.67 94.9 105.1 e1 1.14 1.40 44.9 55.1 L 12.7 15.49 500.0 609.8 R 2.16 2.41 85.0 94.9 S1 0.92 1.52 36.2 59.8 W 0.41 0.56 16.1 22.0 0102782/C 8/10 LM217L/LM317L Tape & Reel SO-8 MECHANICAL DATA mm. inch DIM. MIN. A TYP MAX. MIN. 330 MAX. 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 TYP. 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 9/10 LM217L/LM317L Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. © The ST logo is a registered trademark of STMicroelectronics © 2003 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. © http://www.st.com 10/10