Datasheet

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October 2011 Doc ID 2167 Rev 4 1/18

LM137

LM337

Three-terminal adjustable negative voltage regulators

Features

■ Output voltage adjustable down to V

REF

■

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

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.

TO-220

TO-3

Table 1. Device summary

Part numbers Order codes Packages Temperature range

LM137 LM137K TO-3 - 55 °C to 150 °C

LM337 LM337K TO-3 0 °C to 125 °C

LM337 LM337SP TO-220 0 °C to 125 °C

www.st.com

Summary of content (18 pages)

PAGE 1
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.
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Contents LM137, LM337 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . .
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LM137, LM337 1 Diagram Figure 1.
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Pin configuration LM137, LM337 2 Pin configuration Figure 2.
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LM137, LM337 Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Value Unit Input output voltage differential 40 V IO Output current 1.5 A PD Power dissipation VI - VO Parameter Internally limited TSTG Storage temperature range - 65 to 150 TOP Operating junction temperature range LM137 - 55 to 150 LM337 0 to 125 °C °C Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
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Electrical characteristics 4 LM137, LM337 Electrical characteristics TJ = -55 to 150 °C, VI - VO = 5 V, IO = 0.5 A unless otherwise specified. Table 4. Symbol Electrical characteristics of LM137 Parameter Test conditions Min. Typ. Max. -1.225 -1.25 -1.275 -1.2 -1.25 -1.3 IO = 0.1 A 0.01 0.02 IO = 20 mA 0.01 0.02 |VO| ≤ 5 V 15 25 mV |VO| ≥ 5 V 0.3 0.5 % 0.002 0.02 %/W 65 100 µA 2 5 µA 0.02 0.05 %/V |VO| ≤ 5 V 20 50 mV |VO| ≥ 5 V 0.3 1 % |VI - VO| ≤ 40 V 2.
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LM137, LM337 Table 5. Symbol Electrical characteristics Electrical characteristics of LM337 Parameter Test conditions Min. Typ. Max. -1.213 -1.25 -1.287 -1.2 -1.25 -1.3 IO = 0.1 A 0.01 0.04 IO = 20 mA 0.01 0.04 |VO| ≤ 5 V 15 50 mV |VO| ≥ 5 V 0.3 1 % 0.003 0.04 %/W 65 100 µA 2 5 µA 0.02 0.07 %/V |VO| ≤ 5 V 20 70 mV |VO| ≥ 5 V 0.3 1.5 % |VI - VO| ≤ 40 V 2.5 10 |VI - VO| ≤ 10 V 1.
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Typical characteristics LM137, LM337 5 Typical characteristics Figure 3. Load regulation Figure 4. Current limit Figure 5. Adjustment current Figure 6. Dropout voltage Figure 7. Temperature stability Figure 8.
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LM137, LM337 Figure 9. Typical characteristics 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.
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Thermal regulation 6 LM137, LM337 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.
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LM137, LM337 7 Typical application Typical application Figure 15. Adjustable negative voltage regulator * C1 = 1 µF solid tantalum or 10 µF 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.
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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.
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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.
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Package mechanical data 8 LM137, LM337 Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark.
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LM137, LM337 Package mechanical data TO-220 mechanical data Dim. mm. Min. Max. Min. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 0.70 0.019 0.027 D1 E Typ. inch. 1.27 0.49 Typ. Max. 0.050 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 16.4 0.409 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.
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Package mechanical data LM137, LM337 TO-3 mechanical data mm. Dim. Min. A inch. Typ. Max. Min. Typ. 11.85 B 0.96 Max. 0.466 1.05 1.10 0.037 0.041 0.043 C 1.70 0.066 D 8.7 0.342 E 20.0 0.787 G 10.9 0.429 N 16.9 0.665 P 26.2 R 3.88 1.031 4.09 U 0.152 39.5 V 1.555 30.10 1.185 A P D C O N B V E G U 0.
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LM137, LM337 Revision history 9 Revision history Table 6. Document revision history Date Revision Changes 19-Jul-2004 1 First issue. 10-Jan-2005 2 Modified pin connection for TO-3. 17-Jul-2008 3 Added: Table 1 on page 1. 03-Oct-2011 4 Modified: Table 1 on page 1.
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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.