Datasheet

ManualsBrandsST ManualsIntegrated Circuits (ICs)Linear Voltage Regulator, Negative, 1.2 ... 37V, 2.2A, TO-220

This is information on a product in full production.

May 2014 DocID2167 Rev 5 1/17

LM337

Three-terminal adjustable negative voltage regulators

Datasheet

production data

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 LM337 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, LM337 regulators are supplied in

standard transistor packages which are easily

mounted and handled. In addition to higher

performance than fixed regulators, the LM337

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

Table 1. Device summary

Order codes Packages

Temperature

range

LM337SP TO-220 0 °C to 125 °C

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Summary of content (17 pages)

PAGE 1
LM337 Three-terminal adjustable negative voltage regulators Datasheet - production data 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 Order codes Packages Temperature range LM337SP TO-220 0 °C to 125 °C TO-220 Features • Output voltage adjustable down to VREF • 1.5 A guaranteed output current • 0.3%/V typical load regulation • 0.
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Contents LM337 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical characteristics . . . . . . .
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LM337 1 Diagram Diagram Figure 1.
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Pin configuration 2 LM337 Pin configuration Figure 2.
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LM337 3 Maximum ratings 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 V I - VO Parameter Internally limited TSTG Storage temperature range TOP Operating junction temperature range Note: - 65 to 150 °C 0 to 125 °C Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3.
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Electrical characteristics 4 LM337 Electrical characteristics TJ = 0 to 150 °C VI - VO = 5 V, IO = 0.5 A unless otherwise specified. Table 4. Electrical characteristics Symbol 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.
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LM337 5 Typical characteristics 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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Typical characteristics LM337 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.
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LM337 6 Thermal regulation 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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Typical application 7 LM337 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.
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LM337 Typical application * The 10 µF capacitors are optimal to improve ripple rejection. Figure 17. Current regulator Figure 18. Negative regulator with protection diodes * When CL is larger than 20 µF, D1 protects the LM337 in case the input supply is shorted. ** When C2 is larger than 10 µF and VO is larger than - 25 V, D2 protects the LM337 in case the output is shorted.
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Typical application LM337 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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LM337 8 Package mechanical data 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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Package mechanical data LM337 Figure 21. TO-220 (dual gauge) drawing BW\SH$B5HYB7 14/17 DocID2167 Rev 5
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LM337 Package mechanical data Table 5. TO-220 mechanical data mm Dim. Min. Typ. Max. A 4.40 4.60 b 0.61 0.88 b1 1.14 1.70 c 0.48 0.70 D 15.25 15.75 D1 1.27 E 10 10.40 e 2.40 2.70 e1 4.95 5.15 F 1.23 1.32 H1 6.20 6.60 J1 2.40 2.72 L 13 14 L1 3.50 3.93 L20 16.40 L30 28.90 ∅P 3.75 3.85 Q 2.65 2.
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Revision history 9 LM337 Revision history Table 6. Document revision history Date Revision 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. 5 The part number LM137 has been moved to a separate datasheet. Removed TO-3 package. Updated the description in cover page.
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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.