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| Order this document by LM337M/D LM337M Three-Terminal Adjustable Output Negative Voltage Regulator The LM337M is an adjustable three-terminal negative voltage regulator capable of supplying in excess of 500 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 it essentially blow-out proof. The LM337M 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 LM337M can be used as a precision current regulator. * Output Current in Excess of 500 mA MEDIUM CURRENT THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR SEMICONDUCTOR TECHNICAL DATA * * * * * * * Output Adjustable Between -1.2 V and -37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Output Transistor Safe-Area Compensation Floating Operation for High Voltage Applications Standard 3-Lead Transistor Packages Eliminates Stocking Many Fixed Voltages T SUFFIX PLASTIC PACKAGE CASE 221A Pin 1. Adjust 2. Vin 3. Vout 1 2 3 Standard Application IPROG + Cin * 1.0F R2 R1 120 IAdj Adjust Vin -Vin LM337M Vout -Vout CO ** + 1.0F *Cin is required if regulator is located more than 4 from power supply filter. **A 1.0 F solid tantalum or 10 F aluminum electrolytic is recommended. **CO is necessary for stability. A 1.0 F solid tantalum or 10 F aluminum **electrolytic is recommeded. Vout ORDERING INFORMATION Device LM337MT Operating Temperature Range TJ = 0 to +125C Package Plastic Power Rev 1 + -1.25 V 1 ) R2 R1 (c) Motorola, Inc. 1996 MOTOROLA ANALOG IC DEVICE DATA 1 LM337M MAXIMUM RATINGS Rating Input-Output Voltage Differential Power Dissipation Operating Junction Temperature Range Storage Temperature Range Symbol VI-VO PD TJ Tstg Value 40 Internally Limited 0 to +125 -65 to +150 Unit Vdc W C C ELECTRICAL CHARACTERISTICS (|VI - VO| = 5.0 V, IO = 0.1; TJ = Tlow to Thigh [Note 1], Pmax per Note 2, unless otherwise noted.) Characteristics Line Regulation (Note 3) TA = 25C, 3.0 V |VI-VO| 40 V Load Regulation (Note 3) TA = 25C, 10 mA IO 0.5 A |VO| 5.0V |VO| 5.0V Thermal Regulation 10 ms Pulse, TA = 25C Adjustment Pin Current Adjustment Pin Current Change 2.5 V |VI-VO| 40 V, 10 mA IL 0.5 A, PD Pmax, TA = 25C Reference Voltage 3.0 V |VI-VO| 40 V, 10 mA IO 0.5 A, PD Pmax, TA = 25C Tlow to Thigh Line Regulation (Note 3) 3.0 V |VI-VO| 40 V Load Regulation (Note 3) 10 mA IO 0.5 A |VO| 5.0 V |VO| 5.0 V Temperature Stability (Tlow TJ Thigh) Minimum Load Current to Maintain Regulation (|VI-VO| 10 V) (|VI-VO| 40 V) Maximum Output Current |VI-VO| 15 V, PD Pmax |VI-VO| 40 V, PD Pmax, TJ = 25C RMS Noise, % of VO TA = 25C, 10 Hz f 10 kHz Ripple Rejection, VO = -10 V, f = 120 Hz (Note 4) Without CAdj CAdj = 10 F Long Term Stability, TJ = Thigh (Note 5) TA = 25C for Endpoint Measurements Thermal Resistance, Junction-to-Case Figure 1 2 Symbol Regline Regload - - - 3 1, 2 Regtherm IAdj IAdj - - - 15 0.3 0.03 65 2.0 15 1.0 0.04 100 5.0 mV %/VO % VO/W A A Min - Typ 0.01 Max 0.04 Unit %/V 3 Vref -1.213 -1.20 -1.250 -1.25 0.02 -1.287 -1.30 0.07 V 1 2 Regline Regload - %/V - - 3 3 TS ILmin - - 3 Imax 0.5 0.1 - 4 N RR - 66 3 - S RJC - - - - 20 0.3 0.6 1.5 2.5 0.9 0.25 0.003 70 1.5 - 6.0 10 mV %/VO %/VO mA A - - - %/VO dB 60 77 0.3 7.0 - - 1.0 - %/1.0 k Hrs C/W NOTES: 1. Tlow to Thigh = 0 to +125C 2. Pmax = 7.5 W 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 LM337M Schematic Diagram 100 2.0k 2.5k 810 21k 60 Adjust Vout 10k 15pF 800 220 50k 750 60k 100k 18k 800 15pF 2.0k 4.0k 6.0k 1.0k 3.0k 9.6k 2.2k 18k 240 100 25pF 30k 2.0 pF 250 270 100pF 20k 8.0k 5.0pF 5.0k 100k 15 2.9k 4.0k 600 500 2.4k 155 15 500 0.2 0.1 Vin Figure 1. Line Regulation and IAdj/Line Test Circuit R2 1% + Cin 1.0F IAdj R1 CO 120 1% 1.0F * Pulse Testing Required: 1% Duty Cycle is suggested. VIH Adjust Vin LM337M Vout RL VOH VOL Line Regulation (%/VO) = |VOL - VOH| x 100 |VOH| * VEE VIL MOTOROLA ANALOG IC DEVICE DATA 3 LM337M Figure 2. Load Regulation and IAdj/Load Test Circuit R2 1% CO + * Pulse Testing required: 1% Duty Cycle is suggested. 1.0F * Cin 1.0F IAdj Adjust R1 120 1% -Vin Vin LM33M Vout RL (max Load) IL Load Regulation (%/VO) = -VO (min Load) VO (max Load) VO (min Load) - VO(max Load) x 100 VO (min Load) Load Regulation (mV) = VO (min Load) - VO (max Load) Figure 3. Standard Test Circuit R2 1% + VI Cin 1.0F CO 1.0F RL VO IAdj Adjust Vin To Calculate R2: R2 = VO Vref - 1 R1 LM337M Vout Vref R1 120 IL Pulse Testing Required: 1% Duty Cycle is suggested. This assumes IAdj is negligible. Figure 4. Ripple Rejection Test Circuit + R2 Cin 1.0F Adjust Vin LM337M R1 Vout Vout = -1.25 V 14.3V 4.3V f = 120 Hz *D1 Discharges CAdj if Output is shorted to Ground. 120 D1 * 1% CAdj 10F CO 1N4002 + 1.0F RL VO 4 MOTOROLA ANALOG IC DEVICE DATA LM337M Figure 5. Load Regulation V O , OUTPUT VOLTAGE CHANGE (%) 0.2 0 IO, OUTPUT CURRENT (A) -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 0 0 10 20 30 VI - VO, INPUT VOLTAGE DIFFERENTIAL (Vdc) 40 Vin = -15 V Vout = -10 V IL = 0.5 A 3 TJ = 25C 2 TJ = 150C 1 TJ = 55C 4 Figure 6. Current Limit Figure 7. Adjustment Pin Current 80 IAdj, ADJUSTMENT CURRENT ( A) 75 70 65 60 55 50 45 40 -50 -25 0 25 50 75 100 125 150 TJ, JUNCTION TEMPERATURE (C) V in -Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) 3.0 Figure 8. Dropout Voltage Vout = -5.0 V Vout = 100 mV 2.5 2.0 IL = 500 mA 1.5 IL = 200 mA IL = 20 mA -50 -25 0 25 50 75 100 1.0 125 150 TJ, JUNCTION TEMPERATURE (C) Figure 9. Temperature Stability 1.270 IB , QUIESCENT CURRENT (mA) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 1.230 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 0 0 Vref, REFERENCE VOLTAGE (V) Figure 10. Minimum Operating Current TJ = -55C TJ = 25C TJ = 150C 1.260 1.250 1.240 10 20 30 40 Vin-Vout, INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) MOTOROLA ANALOG IC DEVICE DATA 5 LM337M Figure 11. Ripple Rejection versus Output Voltage 100 RR, RIPPLE REJECTION (dB) 80 60 40 20 0 Vin - Vout = 5.0 V IL = 500 mA f = 120 Hz TJ = 25C 0 -5 -10 -15 -20 -25 -30 VO, OUTPUT VOLTAGE (V) -35 -40 RR, RIPPLE REJECTION (dB) CAdj = 10 F Figure 12. Ripple Rejection versus Output Current 100 80 CAdj = 10 F Without CAdj 60 40 20 0 0.01 Vin = -15 V Vout = -10 V f = 120 Hz TJ = 25C 0.1 1.0 IO, OUTPUT CURRENT (A) 10 Without CAdj Figure 13. Ripple Rejection versus Frequency 100 RR, RIPPLE REJECTION (dB) 80 CAdj = 10 F 60 40 20 0 10 Without CAdj Vin = -15 V Vout = -10 V IL = 500 mA TJ = 25C 100 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz) 10 M Z O , OUTPUT IMPEDANCE ( ) 101 Figure 14. Output Impedance Vin = -15 V Vout = -10 V IL = 500 mA CL = 1.0 F TJ = 25C Without CAdj CAdj = 10F 100 10-1 10-2 10-3 10 100 1.0 k 10 k 100 k 1M f, FREQUENCY (Hz) Vout , OUTPUT VOLTAGE DEVIATION (V) Figure 15. Line Transient Response Vout , OUTPUT VOLTAGE DEVIATION (V) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 0 -0.5 -1.0 -1.5 0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 0 -0.5 -1.0 0 Without CAdj CAdj = 10 F Vout = -10 V IL = 50 mA TJ = 25C CL = 1.0 F 10 20 t, TIME (s) 30 40 Figure 16. Load Transient Reponse Without CAdj CAdj = 10 F Vin , INPUT VOLTAGE CHANGE (V) I L , LOAD CURRENT (A) Vin = -15 V Vout = -10 V INL = 50 mA TJ = 25C CL = 1.0 F 10 20 t, TIME (s) 30 40 6 MOTOROLA ANALOG IC DEVICE DATA LM337M APPLICATIONS INFORMATION Basic Circuit Operation The LM337M is a three-terminal floating regulator. In operation, the LM337M 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 17), 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 into the adjustment terminal (IAdj) represents an error term in the equation, the LM337M was designed to control IAdj to less than 100 A 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 LM337M 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. degrading regulation. The ground end of R2 can be returned near the load ground to provide remote ground sensing and improve load regulation. External Capacitors A 1.0 F 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 F capacitor should improve ripple rejection about 15 dB at 120 Hz in a 10 V application. An output capacitance (CO) in the form of a 1.0 F tantalum or 10 F aluminum electrolytic capacitor is required for 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 18 shows the LM337M with the recommended protection diodes for output voltages in excess of -25 V or high capacitance values (CO > 25 F, CAdj > 10 F). 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. Figure 17. Basic Circuit Configuration + R2 IPRONG + CO R1 - Vout Vref = -1.25 V Typically Vout IAdj Adjust Vin LM337M Vref Figure 18. Voltage Regulator with Protection Diodes + R2 + Cin Adjust -Vin LM337M Vin D1 1N4002 Vout 1N4002 R1 D2 - CO + CAdj + Vout Load Regulation The LM337M 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 MOTOROLA ANALOG IC DEVICE DATA 7 LM337M OUTLINE DIMENSIONS T SUFFIX PLASTIC PACKAGE CASE 221A-06 ISSUE Y -T- B 4 SEATING PLANE F T S C NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCH. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. DIM A B C D F G H J K L N Q R S T U V Z INCHES MIN MAX 0.570 0.620 0.380 0.405 0.160 0.190 0.025 0.035 0.142 0.147 0.095 0.105 0.110 0.155 0.018 0.025 0.500 0.562 0.045 0.060 0.190 0.210 0.100 0.120 0.080 0.110 0.045 0.055 0.235 0.255 0.000 0.050 0.045 --- --- 0.080 MILLIMETERS MIN MAX 14.48 15.75 9.66 10.28 4.07 4.82 0.64 0.88 3.61 3.73 2.42 2.66 2.80 3.93 0.46 0.64 12.70 14.27 1.15 1.52 4.83 5.33 2.54 3.04 2.04 2.79 1.15 1.39 5.97 6.47 0.00 1.27 1.15 --- --- 2.04 Q 123 A U K H Z L V G D N R J 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. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. Motorola does not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such unintended or unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part. Motorola and are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer. How to reach us: USA / EUROPE / Locations Not Listed: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036. 1-800-441-2447 or 602-303-5454 MFAX: RMFAX0@email.sps.mot.com - TOUCHTONE 602-244-6609 INTERNET: http://Design-NET.com JAPAN: Nippon Motorola Ltd.; Tatsumi-SPD-JLDC, 6F Seibu-Butsuryu-Center, 3-14-2 Tatsumi Koto-Ku, Tokyo 135, Japan. 03-81-3521-8315 ASIA/PACIFIC: Motorola Semiconductors H.K. Ltd.; 8B Tai Ping Industrial Park, 51 Ting Kok Road, Tai Po, N.T., Hong Kong. 852-26629298 8 MOTOROLA ANALOG IC DEVICE DATA LM337M/D *LM337M/D* |
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