l78m_v01 STMICROELECTRONICS | Alldatasheet

Document overview

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  • PDF pages: 45

Technical content

Datasheet sections

  • 1 Diagram
  • 2 Pin configuration
  • 3 Maximum ratings
  • 4 Test circuits
  • 5 Electrical characteristics
  • 6 Typical performance
  • 7 Applications information
  • 7.1 Design considerations
  • 8 Package information
  • 8.1 TO-220 (single gauge) package information
  • 8.2 TO-220 (dual gauge) package information
  • 8.3 TO-220FP package information
  • 8.4 DPAK (TO-252) package information
  • 8.5 DPAK packing information
  • 8.6 IPAK package information
  • 9 Ordering information

Features

  • Output current to 0.5 A
  • Output voltages of 5; 6; 8; 9; 10; 12; 15; 24 V
  • Thermal overload protection
  • Short circuit protection
  • Output transition SOA protection
  • Output voltage tolerance: 2 % (AB and AC versions) or 4 % (C version)
  • Guaranteed in extended temperature range

Description

The L78M series of three-terminal positive regulators is available in TO-220, TO-220FP, DPAK and IPAK packages and with several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each type employs internal current limiting, thermal shutdown and safe area protection, resulting it essentially indestructible. If adequate heat sinking is provided, they can deliver over 0.5 A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents. Maturity status link L78M Precision 500 mA regulators L78M Datasheet DS0425 - Rev 24 - September 2020 For further information contact your local STMicroelectronics sales office.

1 Diagram

Figure 1. Block diagram

2 Pin configuration

Figure 2. Pin connections (top view)

Figure 3. Schematic diagram

3 Maximum ratings

Table 1. Absolute maximum ratings operation under these condition is not implied. Table 2. Thermal data Figure 4. Application circuit

4 Test circuits

Figure 5. DC parameter Figure 6. Load regulation Figure 7. Ripple rejection

5 Electrical characteristics

Refer to the test circuits, TJ = 25 °C, VI = 10 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 3. Electrical characteristics of L78M05C

Electrical characteristics

Refer to the test circuits, VI = 10 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 4. Electrical characteristics of L78M05A Refer to the test circuits, TJ = 25 °C, VI = 11 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 5. Electrical characteristics of L78M06C

Refer to the test circuits, VI = 11 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 6. Electrical characteristics of L78M06A Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 7. Electrical characteristics of L78M08C

Refer to the test circuits, VI = 14 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 8. Electrical characteristics of L78M08A Refer to the test circuits, TJ = 25 °C, VI = 15 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 9. Electrical characteristics of L78M09C DS0425 - Rev 24 page 10/45

Refer to the test circuits, VI = 15 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF, TJ = -40 to 125 °C (AB), TJ = 0 to 125 °C (AC) unless otherwise specified. Table 10. Electrical characteristics of L78M09A °C (AC) unless otherwise specified. Table 11. Electrical characteristics of L78M10A DS0425 - Rev 24 page 11/45

Symbol Parameter Test conditions Min. Typ. Max. Unit Isc Short circuit current VI = 35 V, TJ = 25 °C 245 mA Iscp Short circuit peak current TJ = 25 °C 700 mA Refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 12. Electrical characteristics of L78M12C °C (AC) unless otherwise specified. Table 13. Electrical characteristics of L78M12A DS0425 - Rev 24 page 12/45

Symbol Parameter Test conditions Min. Typ. Max. Unit eN Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 75 µV Vd Dropout voltage TJ = 25 °C 2 V Isc Short circuit current VI = 35 V, TJ = 25 °C 240 mA Iscp Short circuit peak current TJ = 25 °C 700 mA Refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 14. Electrical characteristics of L78M15C °C (AC) unless otherwise specified. Table 15. Electrical characteristics of L78M15A DS0425 - Rev 24 page 13/45

Symbol Parameter Test conditions Min. Typ. Max. Unit ∆VO/∆T Output voltage drift IO = 5 mA -1 mV/°C SVR Supply voltage rejection VI = 18.5 to 28.5 V, f = 120 Hz, IO = 300 mA, TJ = 25 °C 54 dB eN Output noise voltage B =10 Hz to 100 kHz, TJ = 25 °C 90 µV Vd Dropout voltage TJ = 25 °C 2 V Isc Short circuit current VI = 35 V, TJ = 25 °C 240 mA Iscp Short circuit peak current TJ = 25 °C 700 mA Refer to the test circuits, TJ = 25 °C, VI = 33 V, IO = 350 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 16. Electrical characteristics of L78M24C °C (AC) unless otherwise specified. Table 17. Electrical characteristics of L78M24A DS0425 - Rev 24 page 14/45

Symbol Parameter Test conditions Min. Typ. Max. Unit ∆Id Quiescent current change IO = 5 to 350 mA 0.5 mA IO = 200 mA, VI = 27 to 38 V 0.8 ∆VO/∆T Output voltage drift IO = 5 mA -1.2 mV/°C SVR Supply voltage rejection VI = 28 to 38 V, f = 120 Hz, IO = 300 mA, TJ = 25 °C 50 dB eN Output noise voltage B =10 Hz to 100 kHz, TJ = 25 °C 170 µV Vd Dropout voltage TJ = 25 °C 2 V Isc Short circuit current VI = 35 V, TJ = 25 °C 240 mA Iscp Short circuit peak current TJ = 25 °C 700 mA L78M DS0425 - Rev 24 page 15/45

6 Typical performance

Figure 8. Dropout voltage vs junction temp. Figure 9. Dropout characteristics Figure 10. Peak output current vs input-output differential Figure 11. Output voltage vs junction temperature

7 Applications information

7.1 Design considerations

Figure 17. Fixed output regulator regulator is located an appreciable distance from power supply filter. Figure 18. Constant current regulator

Figure 28. Adjustable output voltage with temperature compensation

8 Package information

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.

8.1 TO-220 (single gauge) package information

Figure 29. TO-220 (single gauge) package outline

Package information

DS0425 - Rev 24 page 23/45

Table 18. TO-220 (single gauge) mechanical data

8.2 TO-220 (dual gauge) package information

Figure 30. TO-220 (dual gauge) package outline

Table 19. TO-220 (dual gauge) mechanical data

8.3 TO-220FP type A package information

Figure 31. TO-220FP package outline

Table 20. TO-220FP package mechanical data

8.4 DPAK (TO-252) package information

Table 21. DPAK (TO-252) mechanical data (type A)

Figure 32. DPAK (TO-252) package outline A

Table 22. DPAK(TO-252) mechanical data (type E)

Figure 33. DPAK (TO-252) package outline E

Table 23. DPAK (TO-252) mechanical data type I

Figure 34. DPAK (TO-252) package outline I Table 24. DPAK footprint data

Figure 35. DPAK footprint recommended data

8.5 DPAK packing information

Figure 36. DPAK tape

Figure 37. DPAK reel Table 25. DPAK tape and reel mechanical data

8.6 IPAK package information

Figure 38. IPAK package outline

Table 26. IPAK mechanical data

9 Ordering information

Table 27. Order code

Ordering information

DS0425 - Rev 24 page 40/45

Revision history

Table 28. Document revision history 21-Jun-2004 6 Document updating. 30-Aug-2006 7 Order codes updated. 29-Nov-2006 8 DPAK mechanical data updated and add footprint data. 06-Jun-2007 9 Order codes updated. 19-Feb-2008 11 Modified: Table 25 on page 44. 15-Jul-2008 12 Modified: Table 25 on page 44 and Table 26 on page 45. 07-Apr-2009 13 Modified: Figure 9 on page 22 and Figure 15 on page 23. 11-Nov-2010 15 Modified: RthJC value for TO-220 Table 2 on page 5. 09-Mar-2012 17 Added: order codes L78M08CV-DG and L78M09CV-DG Table 25 on page 44. 15-May-2012 18 Added: order codes L78M24CV-DG Table 25 on page 44. 19-Apr-2013 19 Removed: Available on request footnote 2 Table 25 on page 44. Updated the title and the features in cover page. Canceled Table 1.Device summary. Typical performance and Section 8: Package mechanical data. Added Section 7: Applications information and Section 9: Packaging mechanical data. 12-Jun-2019 22 Updated Section 8.4 DPAK (TO-252) package information. Updated Figure 34. DPAK (TO-252) package outline I. 07-Sep-2020 24 Updated Table 21. DPAK (TO-252) mechanical data (type A).