Order this document by LM317L/D The LM317L is an adjustable 3–terminal positive voltage regulator capable of supplying in excess of 100 mA over an output voltage range of 1.2 V to 37 V. This voltage regulator is exceptionally easy to use and requires only two external resistors to set the output voltage. Further, it employs internal current limiting, thermal shutdown and safe area compensation, making them essentially blow–out proof. The LM317L serves a wide variety of applications including local, on card regulation. This device can also be used to make a programmable output regulator, or by connecting a fixed resistor between the adjustment and output, the LM317L can be used as a precision current regulator. • Output Current in Excess of 100 mA • • • • • • • Output Adjustable Between 1.2 V and 37 V LOW CURRENT THREE–TERMINAL ADJUSTABLE POSITIVE VOLTAGE REGULATOR SEMICONDUCTOR TECHNICAL DATA Z SUFFIX PLASTIC PACKAGE CASE 29 Pin 1. Adjust 2. Vout 3. Vin Internal Thermal Overload Protection Internal Short Circuit Current Limiting 1 2 3 Output Transistor Safe–Area Compensation Floating Operation for High Voltage Applications D SUFFIX PLASTIC PACKAGE CASE 751 (SOP–8*) Standard 3–Lead Transistor Package Eliminates Stocking Many Fixed Voltages 8 1 LM317L Vin Vout Vout Adjust N.C. Vout Vout N.C. * SOP–8 is an internally modified SO–8 package. Pins 2, 3, 6 and 7 are electrically common to the die attach flag. This internal lead frame modification decreases package thermal resistance and increases power dissipation capability when appropriately mounted on a printed circuit board. SOP–8 conforms to all external dimensions of the standard SO–8 package. Simplified Application Vin Pin 1. 2. 3. 4. 5. 6. 7. 8. Vout R1 240 IAdj Cin* 0.1µF Adjust + C ** O 1.0µF R2 * Cin is required if regulator is located an appreciable ** distance from power supply filter. ** CO is not needed for stability, however, ** it does improve transient response. Vout ǒ Ǔ + 1.25 V 1 ) RR21 ) IAdj R2 Since IAdj is controlled to less than 100 µA, the error associated with this term is negligible in most applications. ORDERING INFORMATION Device LM317LD LM317LZ LM317LBD LM317LBZ Operating Temperature Range TJ = 0° to +125°C TJ = –40° to +125°C Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA Package SOP–8 Plastic SOP–8 Plastic Rev 1 1 LM317L MAXIMUM RATINGS Rating Symbol Value Unit VI–VO 40 Vdc Power Dissipation PD Internally Limited W Operating Junction Temperature Range TJ –40 to +125 °C Tstg –65 to +150 °C Input–Output Voltage Differential Storage Temperature Range ELECTRICAL CHARACTERISTICS (VI–VO = 5.0 V; IO = 40 mA; TJ = Tlow to Thigh [Note 1]; Imax and Pmax [Note 2]; unless otherwise noted.) LM317L, LB Characteristics Figure Symbol Min Typ Max Unit Line Regulation (Note 3) TA = 25°C, 3.0 V ≤ VI – VO ≤ 40 V 1 Regline – 0.01 0.04 %/V Load Regulation (Note 3), TA = 25°C 10 mA ≤ IO ≤ Imax – LM317L VO ≤ 5.0 V VO ≥ 5.0 V 2 Regload – – 5.0 0.1 25 0.5 mV % VO 3 IAdj – 50 100 µA Adjustment Pin Current Change 2.5 V ≤ VI – VO ≤ 40 V, PD ≤ Pmax 10 mA ≤ IO ≤ Imax – LM317L 1, 2 ∆IAdj – 0.2 5.0 µA Reference Voltage 3.0 V ≤ VI – VO ≤ 40 V, PD ≤ Pmax 10 mA ≤ IO ≤ Imax – LM317L 3 Vref 1.20 1.25 1.30 V Line Regulation (Note 3) 3.0 V ≤ VI – VO ≤ 40 V 1 Regline – 0.02 0.07 %/V Load Regulation (Note 3) 10 mA ≤ IO ≤ Imax – LM317L VO ≤ 5.0 V VO ≥ 5.0 V 2 Regload – – 20 0.3 70 1.5 mV % VO Temperature Stability (Tlow ≤ TJ ≤ Thigh) 3 TS – 0.7 – % VO Minimum Load Current to Maintain Regulation (VI – VO = 40 V) 3 ILmin – 3.5 10 mA Maximum Output Current VI – VO ≤ 6.25 V, PD ≤ Pmax, Z Package VI – VO ≤ 40 V, PD ≤ Pmax, TA = 25°C, Z Package 3 Imax 100 – 200 20 – – – 0.003 – 60 – 80 80 – – S – 0.3 1.0 %/1.0 k Hrs. Thermal Resistance, Junction–to–Case Z Package RθJC – 83 – °C/W Thermal Resistance, Junction–to–Air Z Package RθJA – 160 – °C/W Adjustment Pin Current RMS Noise, % of VO TA = 25°C, 10 Hz ≤ f ≤ 10 kHz N Ripple Rejection (Note 4) VO = 1.2 V, f = 120 Hz CAdj = 10 µF, VO = 10.0 V 4 Long Term Stability, TJ = Thigh (Note 5) TA = 25°C for Endpoint Measurements 3 mA RR % VO dB NOTES: 1. Tlow to Thigh = 0° to +125°C for LM317L –40° to +125°C for LM317LB 2. Imax = 100 mA Pmax = 625 mW 3. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must be taken into account separately. Pulse testing with low duty cycle is used. 4. CAdj, when used, is connected between the adjustment pin and ground. 5. Since Long–Term Stability cannot be measured on each device before shipment, this specification is an engineering estimate of average stability from lot to lot. 2 MOTOROLA ANALOG IC DEVICE DATA LM317L Representative Schematic Diagram Vin 300 300 300 3.0k 30 0 70 6.8V 6.8V 350 18k 8.67k 500 130 40 0 5.1k 200 k 6.3V 180 180 2.0k 6.0k 60 10 pF 10 pF 2.5 Vout 2.4k 12.8k 5 0 Adjust Figure 1. Line Regulation and ∆IAdj/Line Test Circuit VCC Line Regulation (%/V) = * VOH – VOL x 100 VOL VIH VIL Vin LM317L Adjust Cin 0.1µF * Pulse Testing Required: 1% Duty Cycle is suggested. MOTOROLA ANALOG IC DEVICE DATA VOH VOL Vout IAdj R1 240 1% RL + CO 1µF R2 1 % 3 LM317L Figure 2. Load Regulation and ∆IAdj/Load Test Circuit Load Regulation (mV) = VO (min Load) –VO (max Load) Load Regulation (% VO) = Vin* Vin Vout LM317L Adjust VO (min Load) – VO (max Load) VO (min Load) X 100 VO (min Load) VO (max Load) IL R1 RL (max Load) 240 1% RL (min Load) * + Cin 0.1µF CO IAdj 1.0µF R2 1% * Pulse Testing Required: 1% Duty Cycle is suggested. Figure 3. Standard Test Circuit Vin Vout LM317L IL Adjust 240 1% R1 IAdj VI Vref RL + 0.1µF Cin VO 1µF CO ISET R2 1% To Calculate R2: Vout = ISET R2 + 1.250 V Assume ISET = 5.25 mA Pulse Testing Required: 1% Duty Cycle is suggested. Figure 4. Ripple Rejection Test Circuit 14.30V Vout Vin 4.30V f = 120 Hz Adjust Cin R1 240 1% 0.1µF * D1 Discharges CAdj if Output is Shorted to Ground. D1 * 1N4002 1.65K 1% RL + CO R2 4 Vout = 1.25 V LM317L 1µF VO + ** 10µF **CAdj provides an AC ground to the adjust pin. MOTOROLA ANALOG IC DEVICE DATA LM317L 0.4 Figure 6. Ripple Rejection Vin = 45 V Vout = 5.0 V IL = 5.0 mA to 40 mA 0.2 RR, RIPPLE REJECTION (dB) ∆ V out, OUTPUT VOLTAGE CHANGE (%) Figure 5. Load Regulation 0 –0.2 Vin = 10 V Vout = 5.0 V IL = 5.0 mA to 100 mA –0.4 –0.6 –0.8 80 70 IL = 40 mA f = 120 Hz Vout = 10 V Vin = 14 V to 24 V 60 50 –1.0 –50 –25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) 150 –50 –25 Figure 7. Current Limit V in –Vout , INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V) 2.5 IO, OUTPUT CURRENT (A) TJ = 25°C 0.40 0.30 0.20 TJ = 150°C 0.10 0 10 20 30 40 Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V) 2.0 IL = 100 mA 1.5 IL = 5.0 mA 1.0 0.5 50 Figure 9. Minimum Operating Current –50 –25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) 150 Figure 10. Ripple Rejection versus Frequency 100 5.0 4.5 90 TJ = 55°C TJ = 25°C TJ = 150°C 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 RR, RIPPLE REJECTION (dB) IB , QUIESCENT CURRENT (mA) 150 Figure 8. Dropout Voltage 0.50 0 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) IL = 40 mA Vin = 5.0 V ± 1.0 VPP Vout = 1.25 V 80 70 60 50 40 30 20 10 0 10 20 30 40 Vin–Vout, INPUT–OUTPUT VOLTAGE DIFFERENTIAL (V) MOTOROLA ANALOG IC DEVICE DATA 10 100 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz) 5 LM317L Figure 11. Temperature Stability Figure 12. Adjustment Pin Current 80 IAdj, ADJUSTMENT PIN CURRENT ( µA) V ref , REFERENCE VOLTAGE (V) 1.260 1.250 1.240 Vin = 4.2 V Vout = Vref IL = 5.0 mA 1.230 1.220 –50 –25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) 65 60 55 50 45 40 35 150 Vin = 6.25 V Vout = Vref IL = 10 mA IL = 100 mA 70 –50 –25 0.4 Vin = 4.25 V to 41.25 V Vout = Vref IL = 5 mA 0.2 0 –0.2 –0.4 –0.6 –25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) 6.0 150 ∆ Vout , OUTPUT VOLTAGE DEVIATION (V) Figure 15. Line Transient Response 1.5 1.0 CL = 1 µF 0.5 0 –0.5 Vout = 1.25 V IL = 20 mA TJ = 25°C –1.0 –1.5 CL = 0 Vin 0.5 0 10 20 t, TIME (µs) 30 40 –25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) 150 Figure 16. Load Transient Response 0.3 0.2 CL = 1 µF; CAdj = 10 µF 0.1 Vin = 15 V Vout = 10 V INL = 50 mA TJ = 25°C 0 –0.1 CL = 0.3 µF; CAdj = 10 µF –0.2 1.0 0 –50 I L , LOAD CURRENT (mA) ∆ Vout , OUTPUT VOLTAGE DEVIATION (V) 8.0 4.0 –50 ∆ Vin , INPUT VOLTAGE CHANGE (V) Bandwidth 100 Hz to 10 kHz 10 –0.8 –1.0 6 150 Figure 14. Output Noise NOISE VOLTAGE ( µV) ∆ Vout , OUTPUT VOLTAGE CHANGE (%) Figure 13. Line Regulation 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (°C) –0.3 100 IL 50 0 0 10 20 t, TIME (µs) 30 40 MOTOROLA ANALOG IC DEVICE DATA LM317L APPLICATIONS INFORMATION Basic Circuit Operation The LM317L is a 3–terminal floating regulator. In operation, the LM317L develops and maintains a nominal 1.25 V reference (Vref) between its output and adjustment terminals. This reference voltage is converted to a programming current (IPROG) by R1 (see Figure 13), and this constant current flows through R2 to ground. The regulated output voltage is given by: R2 Vout = Vref (1 + ) + IAdj R2 R1 Since the current from the adjustment terminal (IAdj) represents an error term in the equation, the LM317L was designed to control IAdj to less than 100 µA and keep it constant. To do this, all quiescent operating current is returned to the output terminal. This imposes the requirement for a minimum load current. If the load current is less than this minimum, the output voltage will rise. Since the LM317L is a floating regulator, it is only the voltage differential across the circuit which is important to performance, and operation at high voltages with respect to ground is possible. Figure 17. Basic Circuit Configuration Vin Vout LM317L + R1 Vref Adjust External Capacitors A 0.1 µF disc or 1.0 µF tantalum input bypass capacitor (Cin) 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 10 µF capacitor should improve ripple rejection about 15 dB at 120 Hz in a 10 V application. Although the LM317L 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 1.0 µF tantalum or 25 µF aluminum electrolytic capacitor on the output swamps this effect and insures stability. Protection Diodes 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 14 shows the LM317L with the recommended protection diodes for output voltages in excess of 25 V or high capacitance values (CO > 10 µF, CAdj > 5.0 µF). Diode D1 prevents CO from discharging thru the IC during an input short circuit. Diode D2 protects against capacitor CAdj discharging through the IC during an output short circuit. The combination of diodes D1 and D2 prevents CAdj from discharging through the IC during an input short circuit. IPROG Figure 18. Voltage Regulator with Protection Diodes Vout IAdj R2 D1 Vref = 1.25 V Typical 1N4002 Vin Vout LM317L Load Regulation The LM317L is capable of providing extremely good load regulation, but a few precautions are needed to obtain maximum performance. For best performance, the programming resistor (R1) should be connected as close to the regulator as possible to minimize line drops which effectively appear in series with the reference, thereby degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. MOTOROLA ANALOG IC DEVICE DATA + R1 Cin Adjust D2 CO 1N4002 R2 CAdj 7 LM317L Figure 19. Adjustable Current Limiter +25V Vout LM317L D1 IO 1.25k Vin 1N4002 Vin Adjust 500 Vout LM317L D1 1N914 R2 * To provide current limiting of IO to the system ground, the source of the current limiting diode must be tied to a negative voltage below – 7.25 V. R2 ≥ VO R1 Figure 20. 5 V Electronic Shutdown Regulator + 1.0µF 120 D2 1N914 Adjust MPS2222 1.0k 1N5314 Vref IDSS Minimum Vout = 1.25 V VSS* Vref R1 = IOmax + IDSS D1 protects the device during an input short circuit. VO < POV + 1.25 V + VSS ILmin – IP < IO < 100 mA – IP As shown O < IO < 95 mA Figure 21. Slow Turn–On Regulator Vout Vin 1N4002 50k MPS2907 R1 Iout R2 LM317L 240 Adjust Figure 22. Current Regulator Vin LM317L R2 TTL Control 720 Vout IAdj Adjust + 10µF Ioutmax = Vref R1 Ioutmax = Vref R1 + R2 + IAdj ^ 1.25R1 V + IAdj V ^ R1.25 1 + R2 5.0 mA < Iout < 100 mA 8 MOTOROLA ANALOG IC DEVICE DATA LM317L OUTLINE DIMENSIONS Z SUFFIX PLASTIC PACKAGE CASE 29–04 ISSUE AD A NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. CONTOUR OF PACKAGE BEYOND DIMENSION R IS UNCONTROLLED. 4. DIMENSION F APPLIES BETWEEN P AND L. DIMENSION D AND J APPLY BETWEEN L AND K MINIMUM. LEAD DIMENSION IS UNCONTROLLED IN P AND BEYOND DIMENSION K MINIMUM. B R P L F SEATING PLANE K DIM A B C D F G H J K L N P R V D X X G J H V C SECTION X–X 1 N N INCHES MIN MAX 0.175 0.205 0.170 0.210 0.125 0.165 0.016 0.022 0.016 0.019 0.045 0.055 0.095 0.105 0.015 0.020 0.500 ––– 0.250 ––– 0.080 0.105 ––– 0.100 0.115 ––– 0.135 ––– MILLIMETERS MIN MAX 4.45 5.20 4.32 5.33 3.18 4.19 0.41 0.55 0.41 0.48 1.15 1.39 2.42 2.66 0.39 0.50 12.70 ––– 6.35 ––– 2.04 2.66 ––– 2.54 2.93 ––– 3.43 ––– D SUFFIX PLASTIC PACKAGE CASE 751–05 (SOP–8) ISSUE R D A NOTES: 1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M, 1994. 2. DIMENSIONS ARE IN MILLIMETERS. 3. DIMENSION D AND E DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE. 5. DIMENSION B DOES NOT INCLUDE MOLD PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS OF THE B DIMENSION AT MAXIMUM MATERIAL CONDITION. C 8 5 0.25 H E M B M 1 4 h B e X 45 _ q A C SEATING PLANE L 0.10 A1 B 0.25 M C B S A S MOTOROLA ANALOG IC DEVICE DATA DIM A A1 B C D E e H h L q MILLIMETERS MIN MAX 1.35 1.75 0.10 0.25 0.35 0.49 0.18 0.25 4.80 5.00 3.80 4.00 1.27 BSC 5.80 6.20 0.25 0.50 0.40 1.25 0_ 7_ 9 LM317L NOTES 10 MOTOROLA ANALOG IC DEVICE DATA LM317L NOTES MOTOROLA ANALOG IC DEVICE DATA 11 LM317L Motorola reserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. 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Box 20912; Phoenix, Arizona 85036. 1–800–441–2447 or 602–303–5454 JAPAN: Nippon Motorola Ltd.; Tatsumi–SPD–JLDC, 6F Seibu–Butsuryu–Center, 3–14–2 Tatsumi Koto–Ku, Tokyo 135, Japan. 03–81–3521–8315 MFAX: [email protected] – TOUCHTONE 602–244–6609 INTERNET: http://Design–NET.com ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852–26629298 12 ◊ *LM317L/D* MOTOROLA ANALOG IC DEVICE DATA LM317L/D