LM337 1.5 A, Adjustable Output, Negative Voltage Regulator The LM337 is an adjustable 3-terminal negative voltage regulator capable of supplying in excess of 1.5 A 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 LM337 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 LM337 can be used as a precision current regulator. http://onsemi.com THREE-TERMINAL ADJUSTABLE NEGATIVE VOLTAGE REGULATOR MARKING DIAGRAMS Features * * * * * * * * * Output Current in Excess of 1.5 A Output Adjustable between -1.2 V and -37 V Internal Thermal Overload Protection Internal Short Circuit Current Limiting Constant with Temperature Output Transistor Safe-Area Compensation Floating Operation for High Voltage Applications Eliminates Stocking many Fixed Voltages Available in Surface Mount D2PAK and Standard 3-Lead Transistor Package Pb-Free Packages are Available D2PAK D2T SUFFIX CASE 936 Heatsink surface (shown as terminal 4 in case outline drawing) is connected to Pin 2. Pin 1. Adjust 2. Vin 3. Vout IPROG Cin* 1.0 mF R2 + CO** 1.0 mF R1 120 + TO-220AB T SUFFIX CASE 221AB IAdj Heatsink surface connected to Pin 2. Vin -Vin Vout LM337 -Vout *Cin is required if regulator is located more than 4 inches from power supply filter. *A 1.0 mF solid tantalum or 10 mF aluminum electrolytic is recommended. **CO is necessary for stability. A 1.0 mF solid tantalum or 10 mF aluminum electrolytic **is recommended. LM 337yyyy AWLYWWG R V out + -1.25V 1 ) 2 R1 Figure 1. Standard Application LM 337xx AWLYWWG 1 xx yyyy A WL Y WW G = BT, T = BD2T, D2T = Assembly Location = Wafer Lot = Year = Work Week = Pb-Free Package ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet. (c) Semiconductor Components Industries, LLC, 2012 April, 2012 - Rev. 9 1 Publication Order Number: LM337/D LM337 MAXIMUM RATINGS (TA = +25C, unless otherwise noted) Symbol Value Unit VI-VO 40 Vdc PD qJA qJC Internally Limited 65 5.0 W C/W C/W PD qJA qJC Internally Limited 70 5.0 W C/W C/W Operating Junction Temperature Range TJ -40 to +125 C Storage Temperature Range Tstg -65 to +150 C Rating Input-Output Voltage Differential Power Dissipation Case 221A TA = +25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Case 936 (D2PAK) TA = +25C Thermal Resistance, Junction-to-Ambient Thermal Resistance, Junction-to-Case Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. ELECTRICAL CHARACTERISTICS (|VI-VO| = 5.0 V; IO = 0.5 A for T package; TJ = Tlow to Thigh [Note 1]; Imax and Pmax [Note 2].) Figure Symbol Min Typ Max Unit Line Regulation (Note 3), TA = +25C, 3.0 V |VI-VO| 40 V 1 Regline - 0.01 0.04 %/V Load Regulation (Note 3), TA = +25C, 10 mA IO Imax |VO| 5.0 V |VO| 5.0 V 2 Regload - - 15 0.3 50 1.0 mV % VO Characteristics Thermal Regulation, TA = +25C (Note 5), 10 ms Pulse Regtherm - 0.003 0.04 % VO/W 3 IAdj - 65 100 mA 1, 2 DIAdj - 2.0 5.0 mA Reference Voltage, TA = +25C, 3.0 V |VI-VO| 40 V, 10 mA IO Imax, PD Pmax, TJ = Tlow to Thigh 3 Vref -1.213 -1.20 -1.250 -1.25 -1.287 -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 |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 - 0.6 - % VO Minimum Load Current to Maintain Regulation (|VI-VO| 10 V) (|VI-VO| 40 V) 3 ILmin - - 1.5 2.5 6.0 10 Maximum Output Current |VI-VO| 15 V, PD Pmax, T Package |VI-VO| 40 V, PD Pmax, TJ = +25C, T Package 3 Imax - - 1.5 0.15 2.2 0.4 - 0.003 - Ripple Rejection, VO = -10 V, f = 120 Hz (Note 4) Without CAdj CAdj = 10 mF 4 RR - 66 60 77 - - Long-Term Stability, TJ = Thigh (Note 6), TA = +25C for Endpoint Measurements 3 S - 0.3 1.0 %/1.0 k Hrs. RqJC - 4.0 - C/W Adjustment Pin Current Adjustment Pin Current Change, 2.5 V |VI-VO| 40 V, 10 mA IL Imax, PD Pmax, TA = +25C RMS Noise, % of VO, TA = +25C, 10 Hz f 10 kHz N Thermal Resistance, Junction-to-Case, T Package mA A % VO dB 1. Tlow to Thigh = 0 to +125C, for LM337T, D2T. Tlow to Thigh = - 40 to +125C, for LM337BT, BD2T. 2. Imax = 1.5 A, Pmax = 20 W 3. Load and line regulation are specified at constant junction temperature. Change in VO because of heating effects is covered under the Thermal Regulation specification. Pulse testing with a low duty cycle is used. 4. CAdj, when used, is connected between the adjustment pin and ground. 5. Power dissipation within an IC voltage regulator produces a temperature gradient on the die, affecting individual IC components on the die. These effects can be minimized by proper integrated circuit design and layout techniques. Thermal Regulation is the effect of these temperature gradients on the output voltage and is expressed in percentage of output change per watt of power change in a specified time. 6. 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. http://onsemi.com 2 LM337 Representative Schematic Diagram Adjust 60 100 2.0k 2.5k 810 21k Vout 10k 800 15pF 25pF 220 5.0k 75 0 60k 100k 2.0k 15pF 800 18k 4.0k 6.0k 100 1.0k 2.2k 3.0k 9.6k 18k 270 240 5.0pF 100pF 30k 2.0 pF 250 20k 5.0k 8.0k 0.2 100k 600 15 2.9k 4.0k 155 2.4k 500 15 0.05 500 Vin This device contains 39 active transistors. R2 1% + Cin 1.0 mF CO IAdj 120 1% R1 Adjust *Pulse testing required. 1% Duty Cycle is suggested. Vin 1.0 mF RL Vout LM337 VIH VIL * VEE VOH VOL LineRegulation(%V) + |V -V | OL OH x100 |V | OH Figure 1. Line Regulation and DIAdj/Line Test Circuit http://onsemi.com 3 LM337 *Pulse testing required. 1% Duty Cycle is suggested. 1% R2 CO + Cin 1.0 mF IAdj R1 1.0 mF 120 * Adjust -VI Vin Vout LM337 RL (max Load) -VO (min Load) -VO (max Load) IL Load Regulation (mV) = VO (min Load) - VO (max Load) Load Regulation (% VO) = VO (min Load) - VO (max Load) VO (min Load) x 100 Figure 2. Load Regulation and DIAdj/Load Test Circuit 1% R2 VI CO 1.0 mF Cin Vref R1 Adjust Vin LM337 R2 = VO RL IAdj To Calculate R2: + 1.0 mF VO Vref This assumes IAdj is negligible. Vout 120 IL R1 -1 * Pulse testing required. * 1% Duty Cycle is suggested. Figure 3. Standard Test Circuit + R2 Cin CAdj 1% 1.0 mF CO Adjust Vin 10mF LM337 120 R1 D1* + 1.0 mF RL VO 1N4002 Vout Vout = -1.25 V 14.3 V 4.3 V * D1 Discharges CAdj if output is shorted to Ground. f = 120 Hz Figure 4. Ripple Rejection Test Circuit http://onsemi.com 4 0.2 4.0 0 IL = 0.5 A -0.2 I out , OUTPUT CURRENT (A) V out , OUTPUT VOLTAGE CHANGE (%) LM337 -0.4 -0.6 -0.8 Vin = -15 V Vout = -10 V -1.0 IL = 1.5 A 3.0 2.0 TJ = 25C 1.0 -1.2 -1.4 0 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 0 10 20 30 Vin-Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) Figure 5. Load Regulation Figure 6. Current Limit 3.0 V in - Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) IAdj, ADJUSTMENT CURRENT (A) 80 75 70 65 60 55 50 45 40 Vout = -5.0 V DVO = 100 mV 2.5 IL = 1.5 A 2.0 1.0 A 500 mA 1.5 200 mA 20 mA 1.0 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 -50 Figure 7. Adjustment Pin Current -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 150 Figure 8. Dropout Voltage I B , QUIESCENT CURRENT (mA) V ref , REFERENCE VOLTAGE (V) 1.27 1.26 1.25 1.24 1.8 1.6 1.4 1.2 1.0 TJ = 25C 0.8 0.6 0.4 0.2 1.23 40 -50 -25 0 25 50 75 100 125 TJ, JUNCTION TEMPERATURE (C) 0 150 0 Figure 9. Temperature Stability 10 20 30 40 Vin-Vout , INPUT-OUTPUT VOLTAGE DIFFERENTIAL (Vdc) Figure 10. Minimum Operating Current http://onsemi.com 5 LM337 100 CAdj = 10 mF 80 60 RR, RIPPLE REJECTION (dB) RR, RIPPLE REJECTION (dB) 100 Without CAdj 40 Vin - Vout = 5.0 V IL = 500 mA f = 120 Hz TJ = 25C 20 -5.0 -10 -15 -20 -25 Vout, OUTPUT VOLTAGE (V) -30 -35 40 0 0.01 -40 CAdj =10 mF Z O , OUTPUT IMPEDANCE () Vin = -15 V Vout = -10 V IL = 500 mA TJ = 25C 60 Without CAdj 20 1.0 k 10 k 100 k 1.0 M 10-1 Without CAdj CAdj = 10 mF 10-2 10-3 10 10 M f, FREQUENCY (Hz) 1.0 k 10 k f, FREQUENCY (Hz) Figure 13. Ripple Rejection versus Frequency Figure 14. Output Impedance V out , OUTPUT VOLTAGE DEVIATION (V) 100 Vin = -15 V Vout = -10 V IL = 500 mA CL = 1.0 mF TJ = 25C 100 0.8 0.6 0.4 0.2 0 Without CAdj CAdj = 10 mF -0.2 -0.4 I L , LOAD CURRENT (A) RR, RIPPLE REJECTION (dB) V in, INPUT V out , OUTPUT VOLTAGE CHANGE (V) VOLTAGE DEVIATION (V) 10 101 80 Vout = -10 V IL = 50 mA TJ = 25C CL = 1.0 mF 0 -0.5 -1.0 0.1 1.0 IO, OUTPUT CURRENT (A) Figure 12. Ripple Rejection versus Output Current 100 0 10 Vin = -15 V Vout = -10 V f = 120 Hz TJ = 25C 20 Figure 11. Ripple Rejection versus Output Voltage 40 Without CAdj 60 0 0 CAdj = 10 mF 80 0 10 20 30 100 100 k 0.6 0.4 Without CAdj 0.2 0 CAdj = 10 mF -0.2 -0.4 -0.6 Vin = -15 V Vout = -10 V IL = 50 mA TJ = 25C CL = 1.0 mF 0 -0.5 -1.0 -1.5 40 0 10 20 30 t, TIME (ms) t, TIME (ms) Figure 15. Line Transient Response Figure 16. Load Transient Response http://onsemi.com 6 1.0 M 40 LM337 APPLICATIONS INFORMATION Basic Circuit Operation The LM337 is a 3-terminal floating regulator. In operation, the LM337 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 from ground. The regulated output voltage is given by: 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 mF 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 mF 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 mF tantalum or 10 mF aluminum electrolytic capacitor is required for stability. R V out + V 1 ) 2 ) I R 2 ref Adj R1 Since the current into the adjustment terminal (IAdj) represents an error term in the equation, the LM337 was designed to control IAdj to less than 100 mA 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 LM337 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. 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 LM337 with the recommended protection diodes for output voltages in excess of -25 V or high capacitance values (CO > 25 mF, CAdj > 10 mF). 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 the discharging through the IC during an input short circuit. + Vout R2 IPROG IAdj + CO Vin LM337 R1 Vref - Vout Vout Vref = -1.25 V Typical CAdj + Figure 17. Basic Circuit Configuration + CO Cin Adjust Load Regulation The LM337 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 R1 LM337 -Vin Vin Vout 3.5 JUNCTIONTOAIR (C/W) R JA, THERMAL RESISTANCE 3.0 Free Air Mounted Vertically 2.0 oz. Copper L Minimum Size Pad 50 IIII IIII IIII IIII 2.5 2.0 L 40 1.5 RqJA 1.0 30 0 5.0 - Vout Figure 18. Voltage Regulator with Protection Diodes PD(max) for TA = +50C 60 D2 1N4002 D1 1N4002 80 70 + Vout + R2 10 15 20 L, LENGTH OF COPPER (mm) 25 30 Figure 19. D2PAK Thermal Resistance and Maximum Power Dissipation versus P.C.B. Copper Length http://onsemi.com 7 PD, MAXIMUM POWER DISSIPATION (W) Adjust LM337 ORDERING INFORMATION Device Operating Temperature Range Package D2PAK LM337BD2T LM337BD2TG D2PAK (Pb-Free) LM337BD2TR4 D2PAK LM337BD2TR4G TJ = - 40 to +125C D2PAK (Pb-Free) LM337BT TO-220AB LM337BTG TO-220AB (Pb-Free) LM337D2T D2PAK LM337D2TG D2PAK (Pb-Free) LM337D2TR4 D2PAK LM337D2TR4G Shipping TJ = 0 to +125C D2PAK (Pb-Free) LM337T TO-220AB LM337TG TO-220AB (Pb-Free) 50 Units / Rail 800 / Tape & Reel 50 Units / Rail 800 / Tape & Reel 50 Units / Rail For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D. http://onsemi.com 8 LM337 PACKAGE DIMENSIONS D2PAK CASE 936-03 ISSUE D T C A K S B J 2 ES DETAIL C DETAIL C 3 F G SIDE VIEW 2X TOP VIEW D 0.010 (0.254) N M P R C OPTIONAL CHAMFER V H 1 U ED OPTIONAL CHAMFER T TERMINAL 4 L SIDE VIEW BOTTOM VIEW DUAL GAUGE CONSTRUCTION NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCHES. 3. TAB CONTOUR OPTIONAL WITHIN DIMENSIONS A AND K. 4. DIMENSIONS U AND V ESTABLISH A MINIMUM MOUNTING SURFACE FOR TERMINAL 4. 5. DIMENSIONS A AND B DO NOT INCLUDE MOLD FLASH OR GATE PROTRUSIONS. MOLD FLASH AND GATE PROTRUSIONS NOT TO EXCEED 0.025 (0.635) MAXIMUM. 6. SINGLE GAUGE DESIGN WILL BE SHIPPED AFTER FPCN EXPIRATION IN OCTOBER 2011. SINGLE GAUGE CONSTRUCTION T M T SEATING PLANE BOTTOM VIEW DETAIL C OPTIONAL CONSTRUCTIONS SOLDERING FOOTPRINT* 10.49 8.38 16.155 2X 3.504 2X 1.016 5.080 PITCH DIMENSIONS: MILLIMETERS *For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. http://onsemi.com 9 DIM A B C D ED ES F G H J K L M N P R S U V INCHES MIN MAX 0.386 0.403 0.356 0.368 0.170 0.180 0.026 0.036 0.045 0.055 0.018 0.026 0.051 REF 0.100 BSC 0.539 0.579 0.125 MAX 0.050 REF 0.000 0.010 0.088 0.102 0.018 0.026 0.058 0.078 5 _ REF 0.116 REF 0.200 MIN 0.250 MIN MILLIMETERS MIN MAX 9.804 10.236 9.042 9.347 4.318 4.572 0.660 0.914 1.143 1.397 0.457 0.660 1.295 REF 2.540 BSC 13.691 14.707 3.175 MAX 1.270 REF 0.000 0.254 2.235 2.591 0.457 0.660 1.473 1.981 5 _ REF 2.946 REF 5.080 MIN 6.350 MIN LM337 PACKAGE DIMENSIONS TO-220, SINGLE GAUGE CASE 221AB ISSUE A -T- B F T SEATING PLANE C S NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: INCHES. 3. DIMENSION Z DEFINES A ZONE WHERE ALL BODY AND LEAD IRREGULARITIES ARE ALLOWED. 4. PRODUCT SHIPPED PRIOR TO 2008 HAD DIMENSIONS S = 0.045 - 0.055 INCHES (1.143 - 1.397 MM) 4 DIM A B C D F G H J K L N Q R S T U V Z A Q U 1 2 3 H K Z L R V J G D N 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 0.020 0.024 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 0.508 0.61 5.97 6.47 0.00 1.27 1.15 ----2.04 ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5817-1050 http://onsemi.com 10 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative LM337/D