LM237K STMicroelectronics, LM237K Datasheet

IC VOLT REG NEG ADJ 1.5A TO-3

LM237K

Manufacturer Part Number
LM237K
Description
IC VOLT REG NEG ADJ 1.5A TO-3
Manufacturer
STMicroelectronics
Datasheet

Specifications of LM237K

Regulator Topology
Negative Adjustable
Voltage - Output
-1.2 ~ -37 V
Number Of Regulators
1
Operating Temperature
-25°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-204, TO-3
Polarity
Negative
Number Of Outputs
1
Output Type
Adjustable
Output Voltage
- 1.2 V to - 37 V
Output Current
1.5 A
Line Regulation
0.02 % / V
Load Regulation
0.5 %
Input Voltage Max
40 V
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 25 C
Maximum Power Dissipation
20000 mW
Mounting Style
Through Hole
Reference Voltage
- 1.275 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output
-
Voltage - Input
-
Voltage - Dropout (typical)
-
Current - Limit (min)
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM237K
Manufacturer:
ST
0
Part Number:
LM237KCSE3
Manufacturer:
Texas Instruments
Quantity:
1 787
Features
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.
Table 1.
July 2008
Output voltage adjustable down to V
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
Part numbers
Device summary
LM137
LM337
Three-terminal adjustable negative voltage regulators
REF
Order codes
LM137K
LM337K
Rev 3
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
Temperature range
-55 °C to 150 °C
0 °C to 125 °C
TO-3
LM137
LM337
www.st.com
1/18
18

Related parts for LM237K

LM237K Summary of contents

Page 1

Three-terminal adjustable negative voltage regulators Features ■ Output voltage adjustable down to V ■ 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: ...

Page 2

Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...

Page 3

Diagram 1 Figure 1. Schematic diagram 3/18 ...

Page 4

Pin configuration Figure 2. Pin connections (top view) TO-220 4/18 TO-3 ...

Page 5

Maximum ratings Table 2. Absolute maximum ratings Symbol Input output voltage differential Output current O P Power dissipation D T Storage temperature range STG T Operating junction temperature range OP Note: Absolute maximum ...

Page 6

Electrical characteristics Table 4. Electrical characteristics of LM137 (T otherwise specified) Symbol Parameter V Reference voltage REF (2) K Line regulation VI (2) K Load regulation VO Thermal regulation I Adjustment pin current ADJ Adjustment pin current ΔI ADJ ...

Page 7

Table 5. Electrical characteristics of LM337 (T Symbol Parameter V Reference voltage REF (2) K Line regulation VI (2) K Load regulation VO Thermal regulation I Adjustment pin current ADJ Adjustment pin current ΔI ADJ change (2) K Line regulation ...

Page 8

Typical characteristics Figure 3. Load regulation Figure 5. Adjustment current Figure 7. Temperature stability 8/18 Figure 4. Current limit Figure 6. Dropout voltage Figure 8. Minimum operating current ...

Page 9

Figure 9. Ripple rejection vs output voltage Figure 11. Ripple rejection vs output current Figure 13. Line transient response Figure 10. Ripple rejection vs frequency Figure 12. Output impedance Figure 14. Load transient response 9/18 ...

Page 10

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 ...

Page 11

Typical application Figure 15. Adjustable negative voltage regulator * µF solid tantalum or 10µF aluminium electrolytic required for stability µF solid tantalum is required only if regulator is more than 10 cm ...

Page 12

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 V ...

Page 13

Figure 19. - 5.2 V regulator with electronic shutdown 1. Minimum output = - 1.3 V when control input is low. Figure 20. Current regulator (1) 13/18 ...

Page 14

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 ...

Page 15

TO-220 mechanical data mm. Dim. Min. Typ. A 4.40 C 1.23 D 2.40 D1 1.27 E 0.49 F 0.61 F1 1.14 F2 1.14 G 4.95 G1 2.4 H2 10.0 L2 16.4 L4 13.0 L5 2.65 L6 15.25 L7 6.2 L9 ...

Page 16

Dim. Min 0. 3. 16/18 TO-3 mechanical data mm. Typ. Max. 11.85 1.05 1.10 1.70 8.7 20.0 10.9 16.9 26.2 4.09 39.5 30. inch. Min. Typ. ...

Page 17

Revision history Table 6. Document revision history Date Revision 19-Jul-2004 1 10-Jan-2005 2 17-Jul-2008 3 Changes First issue. Modified pin connection for TO-3. Added: Table 1 on page 1. 17/18 ...

Page 18

... 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. ...

Related keywords