LM337K

LM137 LM337 Three-terminal adjustable negative voltage regulators Features ■ ■ ■ ■ ■ ■ ■ ■ ■ Output voltage adjustable down to VREF 1.5 A guaranteed output current 0.3 %/V typical load regulation 0.01 %/V typical line regulation Current limit constant with temperature Ripple rejection: 77 dB Standard 3-lead transistor packages Excellent thermal regulation: 0.002 %/V 50 ppm/°C temperature coefficient TO-220 TO-3 Description The LM137 series are adjustable 3-terminal negative voltage regulators capable of supplying in excess -1.5 A over a -1.2 to -37 V output voltage range. They are exceptionally easy to use and require only two external resistors to set the output voltage. Further, both line and load regulation are better than standard fixed regulators. Also, LM137 regulators are supplied in standard transistor packages which are easily mounted and handled. In addition to higher performance than fixed regulators, the LM137 series offer full overload protection available only in integrated circuits. Included on the chip are current limit, thermal overload protection and safe area protection. All overload protection circuitry remains fully functional even if the adjustment terminal is disconnected. Table 1. Device summary Part numbers LM137 LM337 Order codes LM137K LM337K Temperature range -55 °C to 150 °C 0 °C to 125 °C July 2008 Rev 3 1/18 www.st.com 18 Contents LM137 - LM337 Contents 1 2 3 4 5 6 7 8 9 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Typical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Thermal regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 2/18 LM137 - LM337 Diagram 1 Figure 1. Diagram Schematic diagram 3/18 Pin configuration LM137 - LM337 2 Figure 2. Pin configuration Pin connections (top view) TO-220 TO-3 4/18 LM137 - LM337 Maximum ratings 3 Table 2. Symbol VI - VO IO PD TSTG TOP Maximum ratings Absolute maximum ratings Parameter Input output voltage differential Output current Power dissipation Storage temperature range LM137 Operating junction temperature range LM337 0 to 125 Value 40 1.5 Internally limited - 65 to 150 - 55 to 150 °C °C Unit V A Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Thermal data Parameter Thermal resistance junction-case max. Thermal resistance junction-ambient max. TO-220 3 70 TO-3 4 35 Unit °C/W °C/W Table 3. Symbol RthJC RthJA 5/18 Electrical characteristics LM137 - LM337 4 Table 4. Symbol Electrical characteristics Electrical characteristics of LM137 (TJ = -55 to 150 °C, VI - VO = 5 V, IO = 0.5 A unless otherwise specified) (1) Parameter Ta = 25°C Test conditions Min. -1.225 -1.2 Typ. -1.25 -1.25 0.01 0.01 15 0.3 0.002 65 Ta = 25°C, |IO| = 10 mA to |IO(max)| |VI - VO| = 3 to 40 V |VI - VO| = 3 to 40 V |IO| = 10mA to |IO(max)| |VI - VO| ≤ 40 V |VI - VO| ≤ 10 V |VI - VO| ≤ 15 V |VI - VO| = 40 V, TJ =25°C RMS output noise (% of VO) Ripple rejection ratio Temperature stability Long term stability Ta = 125°C, 1000 H Ta = 25°C, f = 10 Hz to 10 kHz VO = -10 V, f = 120 Hz CADJ = 10 µF 66 1.5 0.24 |VO| ≤ 5 V |VO| ≥ 5 V 2 0.02 20 0.3 2.5 1.2 2.2 A 0.4 0.003 60 dB 77 0.6 0.3 1 % % % Max. -1.275 V -1.3 0.02 %/V 0.02 25 0.5 0.02 100 5 0.05 50 1 5 mA 3 mV % %/W µA µA %/V mV % Unit VREF Reference voltage |VI - VO| = 3 to 40 V, TJ = Tmin to Tmax |IO| = 10mA to |IO(max)| P ≤ Pmax Ta = 25°C |VI - VO| = 3 to 40 V Ta = 25°C |IO| = 10mA to |IO(max)| Ta = 25°C, pulse 10 ms IO = 0.1 A IO = 20 mA |VO| ≤ 5 V |VO| ≥ 5 V KVI Line regulation (2) KVO Load regulation (2) Thermal regulation IADJ ΔIADJ KVI KVO Adjustment pin current Adjustment pin current change Line regulation (2) Load regulation (2) |IO(min)| Minimum load current IOS VNO RVF KVT KVH Short circuit output current 1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of: 15 W for TO-220 and 20 W for TO-3 Package; IO(max) is 1.5 A 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. 6/18 LM137 - LM337 Table 5. Symbol Electrical characteristics Electrical characteristics of LM337 (TJ = 0 to 150 °C unless otherwise specified). (1) Parameter Ta = 25°C Test conditions Min. -1.213 -1.2 Typ. -1.25 -1.25 0.01 0.01 15 0.3 0.003 65 Ta = 25°C, |IO| = 10 mA to |IO(max)| |VI - VO| = 3 to 40 V |VI - VO| = 3 to 40 V |IO| = 10mA to |IO(max)| |VI - VO| ≤ 40 V |VI - VO| ≤ 10 V |VI - VO| ≤ 15 V |VI - VO| = 40 V, TJ =2 5°C RMS output noise (% of VO) Ripple rejection ratio Temperature stability Long term stability Ta = 125°C, 1000 H Ta = 25°C, f = 10 Hz to 10 kHz VO = -10 V, f = 120 Hz CADJ = 10 µF 66 1.5 0.15 |VO| ≤ 5 V |VO| ≥ 5 V 2 0.02 20 0.3 2.5 1.5 2.2 A 0.4 0.003 60 dB 77 0.6 0.3 1 % % % Max. -1.287 V -1.3 0.04 %/V 0.04 50 1 0.04 100 5 0.07 70 1.5 10 mA 6 mV % %/W µA µA %/V mV % Unit VREF Reference voltage |VI - VO| = 3 to 40 V, TJ = Tmin to Tmax |IO| = 10mA to |IO(max)|, P ≤ Pmax Ta = 25°C |VI - VO| = 3 to 40 V Ta = 25°C |IO| = 10mA to |IO(max)| Ta = 25°C, pulse 10 ms IO = 0.1 A IO = 20 mA |VO| ≤ 5 V |VO| ≥ 5 V KVI Line regulation (2) KVO Load regulation (2) Thermal regulation IADJ ΔIADJ KVI KVO Adjustment pin current Adjustment pin current change Line regulation (2) Load regulation (2) |IO(min)| Minimum load current IOS VNO RVF KVT KVH Short circuit output current 1. Although power dissipation is internally limited, these specifications are applicable for power dissipation of: 15 W for TO-220 and 20 W for TO-3 package; IO(max) is 1.5 A. 2. Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. 7/18 Typical characteristics LM137 - LM337 5 Figure 3. Typical characteristics Load regulation Figure 4. Current limit Figure 5. Adjustment current Figure 6. Dropout voltage Figure 7. Temperature stability Figure 8. Minimum operating current 8/18 LM137 - LM337 Typical characteristics Figure 9. Ripple rejection vs output voltage Figure 10. Ripple rejection vs frequency Figure 11. Ripple rejection vs output current Figure 12. Output impedance Figure 13. Line transient response Figure 14. Load transient response 9/18 Thermal regulation LM137 - LM337 6 Thermal regulation When power is dissipated in an IC, a temperature gradient occurs across the IC chip affecting the individual IC circuit components. With an IC regulator, this gradient can be especially severe since power dissipation is large. Thermal regulation is the effect of these temperature gradients on output voltage (in percentage output change) per watt of power change in a specified time. Thermal regulation error is independent of electrical regulation or temperature coefficient, and occurs within 5 ms to 50 ms after a change in power dissipation. Thermal regulation depends on IC layout as well as electrical design. The thermal regulation of a voltage regulator is defined as the percentage change of VO, per watt, within the first 10ms after a step of power, is applied. The LM137 specification is 0.02 %/W max. In Figure 1, a typical LM337’s output drifts only 3 mV for 0.03% of VO = – 10 V) when a 10 W pulse is applied for 10 ms. This performance is thus well inside the specification limit of 0.02 %/W x 10 W = 0.2% max. When the 10 W pulse is ended the thermal regulation again shows a 3 mV step as the LM137 chip cools off. Note that the load regulation error of about 8 mV (0.08 %) is additional to the thermal regulation error. In Figure 2, when the 10 W pulse is applied for 100 ms, the output drifts only slightly beyond the drift in the first 10 ms and the thermal error stays well within 0.1% (10 mV). 10/18 LM137 - LM337 Typical application 7 Typical application Figure 15. Adjustable negative voltage regulator * C1 = 1 µF solid tantalum or 10µF aluminium electrolytic required for stability. ** C2 = 1 µF solid tantalum is required only if regulator is more than 10 cm from power supply filter capacitors Figure 16. Adjustable lab voltage regulator * The 10 µF capacitors are optimal to improve ripple rejection. 11/18 Typical application LM137 - LM337 Figure 17. Current regulator Figure 18. Negative regulator with protection diodes * When CL is larger than 20 µF, D1 protects the LM137 in case the input supply is shorted. ** When C2 is larger than 10 µF and VO is larger than - 25 V, D2 protects the LM137 in case the output is shorted. 12/18 LM137 - LM337 Typical application Figure 19. - 5.2 V regulator with electronic shutdown (1) 1. Minimum output = - 1.3 V when control input is low. Figure 20. Current regulator 13/18 Package mechanical data LM137 - LM337 8 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. 14/18 LM137 - LM337 Package mechanical data TO-220 mechanical data Dim. A C D D1 E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 DIA. 13.0 2.65 15.25 6.2 3.5 3.75 0.49 0.61 1.14 1.14 4.95 2.4 10.0 16.4 14.0 2.95 15.75 6.6 3.93 3.85 0.511 0.104 0.600 0.244 0.137 0.147 mm. Min. 4.40 1.23 2.40 1.27 0.70 0.88 1.70 1.70 5.15 2.7 10.40 0.019 0.024 0.044 0.044 0.194 0.094 0.393 0.645 0.551 0.116 0.620 0.260 0.154 0.151 Typ. Max. 4.60 1.32 2.72 Min. 0.173 0.048 0.094 0.050 0.027 0.034 0.067 0.067 0.203 0.106 0.409 inch. Typ. Max. 0.181 0.051 0.107 P011C 15/18 Package mechanical data LM137 - LM337 TO-3 mechanical data Dim. A B C D E G N P R U V 30.10 3.88 10.9 16.9 26.2 4.09 39.5 1.185 0.152 0.96 mm. Min. Typ. 11.85 1.05 1.10 1.70 8.7 20.0 0.429 0.665 1.031 0.161 1.555 0.037 Max. Min. inch. Typ. 0.466 0.041 0.043 0.066 0.342 0.787 Max. P G A D C U V O N R P003C/C 16/18 B E LM137 - LM337 Revision history 9 Table 6. Date Revision history Document revision history Revision 1 2 3 First issue. Modified pin connection for TO-3. Added: Table 1 on page 1. Changes 19-Jul-2004 10-Jan-2005 17-Jul-2008 17/18 LM137 - LM337 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. 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