LM238 STMicroelectronics, LM238 Datasheet
LM238
Available stocks
Related parts for LM238
LM238 Summary of contents
Page 1
... The LM138, LM238, LM338 are packaged in standard steel TO-3 transistor package. The LM138 is rated for operation from - 55 °C to 150 °C, the LM238 from - 25 °C to 150 °C and the LM338 from 0 °C to 125 °C. Order codes LM138K LM238K ...
Page 2
Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...
Page 3
Diagram 1 Figure 1. Schematic diagram 3/23 ...
Page 4
Pin configuration Figure 2. Pin connections (top view) 4/23 TO-3 ...
Page 5
... Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3. Thermal data Symbol R Thermal resistance junction-case thJC R Thermal resistance junction-ambient thJA Parameter LM138 LM238 LM338 Parameter Value Unit 35 V Internally limited -65 to 150 °C 300 °C -55 to 150 -25 to 125 ° ...
Page 6
... Long term stability -55 to 150 °C for LM138 -25 to 150 °C for LM238 internally limited, these specifications apply to power dissipation unless otherwise specified) 2. Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects are taken into account separately by thermal rejection ...
Page 7
Table 5. Electrical characteristics for LM338 Symbol Parameter (2) K Line regulation VI (2) K Load regulation VO Thermal regulation I Adjustment pin current ADJ Adjustment pin current ΔI ADJ change V Reference voltage REF (2) K Line regulation VI ...
Page 8
Typical characteristics Figure 3. Current limit Figure 5. Current limit 8/23 Figure 4. Current limit Figure 6. Load regulation ...
Page 9
Figure 7. Dropout voltage Figure 9. Temperature stability Figure 8. Adjustment current Figure 10. Output impedance 9/23 ...
Page 10
Figure 11. Minimum operating current Figure 13. Ripple rejection 10/23 Figure 12. Ripple rejection Figure 14. Ripple rejection ...
Page 11
Figure 15. Line transient response Figure 16. Load transient response 11/23 ...
Page 12
... Figure 17. 1 adjustable regulator Needed if device is far from filter capacitors. * Optional-improves transient response. Output capacitors in the range of 1mF to 100mF of aluminium or tantalum electrolytic are commonly used to provide improved output impedance and rejection of transients ** 240 Ω for LM138 and LM238 *** R 1 12/ ...
Page 13
Application hints In operation, the LM338 develops a nominal 1.25 V reference voltage, V output and adjustment terminal. The reference voltage is impressed across program resistor R and, since the voltage is constant, a constant current I 1 resistor ...
Page 14
Although the LM338 is stable with no output capacitors, like any feedback circuit, certain values of external capacitance can cause excessive ringing. This occurs with values between 500 pF and 5000 pF ...
Page 15
Figure 19. Regulator with line resistance in output lead Figure 20. Regulator with protection diodes 15/23 ...
Page 16
Figure 21 regulator * Minimum load - 100 mA ≥ ≥ ≥ 3 Figure 22 current regulator * Minimum load - 100 ...
Page 17
Figure 23 regulator * Minimum load - 100mA ≥ ≥ ≥ 17/23 ...
Page 18
... Figure 24 logic regulator with electronic shutdown = 240 Ω for LM138 or LM238 * 720 Ω for LM138 or LM238 * Minimum load - 100 mA Figure 25. Tracking pre-regulator = 240 Ω for LM138 or LM238 * 720 Ω for LM138 or LM238 * Minimum output = 1.2 V 18/23 ...
Page 19
... Figure 26. Slow turn- regulator = 240 Ω for LM138 or LM238 * 2.7 kΩ for LM138 or LM238 2 19/23 ...
Page 20
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 21
TO-3 mechanical data mm. Dim. Min. Typ. A 11.85 B 0.96 1. 10 30.10 Max. Min. 1.10 0.037 1.70 8.7 20.0 26.2 4.09 0.152 39 ...
Page 22
Revision history Table 6. Document revision history Date Revision 16-Apr-2003 1 11-Apr-2008 2 22/23 Changes First release. Added: Table 1 on page 1. ...
Page 23
... 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. ...