LM217MX

LM217M LM317M MEDIUM CURRENT 1.2 TO 37V ADJUSTABLE VOLTAGE REGULATOR s s s s s s s s OUTPUT VOLTAGE RANGE : 1.2 TO 37V OUTPUT CURRENT IN EXCESS OF 500 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 TO-220 DESCRIPTION The LM217M/LM317M are monolithic integrated circuits in TO-220, DPAK, SOT-82 and SOT-194 packages intended for use as positive adjustable voltage regulators. They are designed to supply until 500 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 exceptionally easy to use and eliminating the stocking of many fixed regulators. SCHEMATIC DIAGRAM DPAK TO-252 SOT-82 SOT-194 September 1997 1/11 LM217M/LM317M ABSOLUTE MAXIMUM RATINGS Symbol Vi - Vo Pd T o pr T stg Parameter Input-Output Differential Voltage Power Dissipation Operating Junction Temperature Range (*) Storage Temperature Range o Value 40 Internally Limited for LM217M for LM317M -40 to 125 0 to 125 -55 to 150 Unit V o o o C C C (*) Re-Boot is not guaranteed for Tj ≥ 85 C THERMAL DATA Symbol Parameter SOT-82 SOT-194 DPAK Max Max 8 100 TO-220 Unit R thj-ca se Thermal Resistance Junction-case R thj-a mb Thermal Resistance Junction-ambient 3 50 o o C/W C/W PIN CONNECTION AND ORDERING NUMBERS TO-220 SOT-82 DPAK SOT-194 Type LM217M LM317M TO-220 LM217MT LM317MT DPAK LM217MDT LM317MDT SOT-82 LM217MX LM317MX SOT-194 LM217MS LM317MS TEST CIRCUIT 2/11 LM217M/LM317M ELECTRICAL CHARACTERISTICS FOR LM217M (Refer to the test circuits, -40 ≤ Tj ≤ 125 oC Vi - Vo = 5 V, Io = 100 mA, Pd ≤ 7.5W, unless otherwise specified) Symbol ∆ Vo ∆ Vo Parameter Line Regulation Load Regulation Test Conditions Vi - Vo = 3 to 40 V Vo ≤ 5V Io = 10 mA to 500 mA Vo ≥ 5V Io = 10 mA to 500 mA I ADJ ∆ IADJ V REF ∆Vo Vo I o(min) I o( max) eN SVR Adjustment Pin Current Adjustment Pin Current Reference Voltage Output Voltage Temperature Stability Minimum Load Current Maximum Output Current Output Noise Voltage (percentance of VO) Supply Voltage Rejection (*) Vi - Vo = 40 V Vi - Vo ≤15V Vi - Vo =40V, Pd < PdMAX, Tj =25oC B = 10Hz to 10KHz o Tj = 25 C o Tj = 25 C f = 120 Hz 500 Vi - Vo = 3 to 40 V Io = 10 mA to 500 mA Vi - Vo = 3 to 40 V Io = 10 mA to 500 mA T j = 25 C T j = 25 C T j = 25 o C o o Min. Typ. 0.01 0.02 5 20 0.1 0.3 50 0.2 Max. 0.02 0.05 15 50 0.3 1 100 5 1.3 Unit %/V %/V mV mV %/V o %/V o µA µA V % 1.2 1.25 0.7 3.5 1000 200 0.003 5 mA mA % dB dB C ADJ =0 C ADJ =10µ F 66 65 80 (*) CADJ is connected between Adjust pin and Ground. ELECTRICAL CHARACTERISTICS FOR LM317M (Refer to the test circuits, 0 ≤ Tj ≤ 125 oC Vi - Vo = 5 V, Io = 100 mA, Pd ≤ 7.5W, unless otherwise specified) Symbol ∆ Vo ∆ Vo Parameter Line Regulation Load Regulation Test Conditions Vi - Vo = 3 to 40 V Vo ≤ 5V Io = 10 mA to 500 mA Vo ≥ 5V Io = 10 mA to 500 mA I ADJ ∆ IADJ V REF ∆Vo Vo I o(min) I o( max) eN SVR Adjustment Pin Current Adjustment Pin Current Reference Voltage Output Voltage Temperature Stability Minimum Load Current Maximum Output Current Output Noise Voltage (percentance of VO) Supply Voltage Rejection (*) Vi - Vo = 40 V Vi - Vo ≤15V o Vi - Vo =40V, Pd < PdMAX, Tj =25 C B = 10Hz to 10KHz o Tj = 25 C Tj = 25 oC f = 120 Hz 500 Vi - Vo = 3 to 40 V Io = 10 mA to 500 mA Vi - Vo = 3 to 40 V Io = 10 mA to 500 mA T j = 25 C T j = 25 o C T j = 25 C o o Min. Typ. 0.01 0.02 5 20 0.1 0.3 50 0.2 Max. 0.04 0.07 25 70 0.5 1.5 100 5 1.3 Unit %/V %/V mV mV %/V o %/V o µA µA V % 1.2 1.25 0.7 3.5 1000 200 0.003 10 mA mA % dB dB C ADJ =0 C ADJ =10µ F 66 65 80 (*) CADJ is connected between Adjust pin and Ground. 3/11 LM217M/LM317M Figure 1 : Current Limit Figure 2 : Minimum Operating Current Figure 3 : Basic Adjustable Regulator. LM317M Figure 4 : Thermal Resistance & Maximum Power Dissipation vs P.C.B. Copper Lenght for DPAK Pdmax calculated for Ta = 50 oC 4/11 LM217M/LM317M APPLICATION INFORMATION The LM317M 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. 3), giving an output voltage VO of: R2 VO = VREF (1 + ) + 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 LM317M is a floating regulator and ”sees” only the input-to-outputdifferential 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 optimise the load regulation, the current set resistor R1 (see fig. 3) 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. EXTERNAL CAPACITORS (Fig.5) Normally no capacitors are needed unless the device is situated far from the input filter capacitors; in which case an input bypass is needed. A 0.1µF disc or 1µF tantalium input bypass capacitor (CI) is recommended to reduce the sensitivity to input line impedance. The adjustment terminal may be bypassed to ground to improve ripple rejection. This capacitor (Cadj) prevents ripple from being amplified as the output voltage is increased. A 10µF capacitor should improve ripple rejection about 80dB at 120Hz an a 10V application. Although the LM317M is stable with no output capacitance like any feedback circuit, certain values of external capacitance can cause excessive ringing. An output capacitance (CO) in the form of a 1µF tantalium or 25µF aluminium electrolytic capacitor on the output swamps this effect and insures stability. PROTECTION DIODES (Fig.5) When external capacitors are used with any IC regulator it is sometimes necessary to add protection diodes to prevent the capacitors from discharging through low current points into the regulator. Figure 5 show the LM317M with the recommended protection diodes for output voltages in excess of 25V or high capacitance values (C3 > 25µF, C2 > 10µF). Diode D1 prevents C3 from discharging through the IC during an input short-circuit. The combination of diodes D1 and D2 prevents C2 from discarging through the regulator during an input or output short-circuit. START-UP BLOCK It’s not guaranteed the Re-Boot of the device when the junction temperature is over 85 oC. 5/11 LM217M/LM317M Figure 5 : Voltage Regulator with Protection Diodes. LM317M Figure 6 : Slow Turn-on 15V Regulator. Figure 7 : Current Regulator. LM317M LM317M Io = Vref 1.25V + IADJ ≈ R1 R1 Figure 8 : 5V Electronic Shut-down Regulator. Figure 9 : Digitally Selected Outputs. LM317M LM317M (R2 sets maximum Vo) 6/11 LM217M/LM317M TO-220 MECHANICAL DATA DIM. MIN. A C D D1 E F F2 G H2 H3 L2 L3 L5 L6 L7 Dia. 26.3 2.6 15.1 6 3.65 10.05 16.2 26.7 27.1 3 15.8 6.6 3.85 1.035 0.102 0.594 0.236 0.144 2.4 1.2 0.35 0.61 1.15 4.95 5.08 mm TYP. MAX. 4.8 1.37 2.8 1.35 0.55 0.94 1.4 5.21 10.4 10.4 0.396 0.638 1.051 1.067 0.118 0.622 0.260 0.152 0.094 0.047 0.014 0.024 0.045 0.195 0.200 MIN. inch TYP. MAX. 0.189 0.054 0.110 0.053 0.022 0.037 0.055 0.205 0.409 0.409 P011D 7/11 LM217M/LM317M TO-252 (DPAK) MECHANICAL DATA mm MIN. A A1 A2 B B2 C C2 D E G H L2 L4 0.6 2.2 0.9 0.03 0.64 5.2 0.45 0.48 6 6.4 4.4 9.35 0.8 1 0.023 TYP. MAX. 2.4 1.1 0.23 0.9 5.4 0.6 0.6 6.2 6.6 4.6 10.1 MIN. 0.086 0.035 0.001 0.025 0.204 0.017 0.019 0.236 0.252 0.173 0.368 0.031 0.039 inch TYP. MAX. 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 0.260 0.181 0.397 DIM. H A C2 C DETAIL ”A” A1 L2 D DETAIL ”A” B = = 3 B2 = = G E 2 L4 1 = = A2 0068772-B 8/11 LM217M/LM317M SOT-82 MECHANICAL DATA mm MIN. A B b b1 C c1 D e e3 F H 7.4 10.5 0.7 0.49 2.4 1.2 15.7 2.2 4.4 3.8 2.54 TYP. MAX. 7.8 11.3 0.9 0.75 2.7 MIN. 0.291 0.413 0.028 0.019 0.04 0.047 0.618 0.087 0.173 0.150 0.100 inch TYP. MAX. 0.307 0.445 0.035 0.030 0.106 DIM. C A F H c1 b b1 e3 e D B P032A 9/11 LM217M/LM317M SOT-194 MECHANICAL DATA DIM. MIN. A B b b1 C c1 c2 D e e3 F H P S S1 T 4 2 0.1 7.4 10.5 0.7 0.49 2.4 1.2 1.3 6 2.2 4.4 3.8 2.54 45 (typ.) 0.157 0.079 0.004 mm TYP. MAX. 7.8 11.3 0.9 0.75 2.7 MIN. 0.291 0.413 0.028 0.019 0.094 0.047 0.051 0.236 0.087 0.173 0.150 0.100 inch TYP. MAX. 0.307 0.445 0.035 0.030 0.106 C A F C1 S T P H D b1 b c2 e3 P032B 10/11 S1 e B LM217M/LM317M Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the consequence of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No s 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 as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectonics. © 1997 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved SGS-THOMSON Microelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A . 11/11