l78_v01 STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: Provided By alldatasheet.com(free datasheet download site)
- PDF pages: 55
Technical content
Datasheet sections
- 1 Diagram
- 2 Pin configuration
- 3 Maximum ratings
- 4 Test circuits
- 5 Electrical characteristics
- 6 Application information
- 6.1 Design consideration
- 7 Typical performance
- 8 Package information
- 8.1 TO-220 (dual gauge) package information
- 8.2 TO-220 (single gauge) package information
- 8.3 TO-220FP package information
- 8.4 TO-220 packing information
- 8.5 DPAK package information
- 8.6 D²PAK (SMD 2L STD-ST) type A package information
- 8.7 D²PAK (ASE subcon) type B package information
- 8.8 D²PAK and DPAK packing information
- 9 Ordering information
Features
- Output current up to 1.5 A
- Output voltages of 5; 6; 8; 8.5; 9; 12; 15; 18; 24 V
- Thermal overload protection
- Short circuit protection
- Output transition SOA protection
- 2 % output voltage tolerance (A version)
- Guaranteed in extended temperature range (A version)
Description
The L78 series of three-terminal positive regulators is available in TO-220, TO-220FP, D²PAK and DPAK packages and 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 embeds internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1 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 L78 Positive voltage regulator ICs L78 Datasheet DS0422 - Rev 36 - September 2018 For further information contact your local STMicroelectronics sales office.
1 Diagram
Figure 2. Block diagram
2 Pin configuration
Figure 3. Pin connections (top view) Figure 4. Schematic diagram
3 Maximum ratings
Table 1. Absolute maximum ratings operation under these condition is not implied. Table 2. Thermal data Figure 5. Application circuits
4 Test circuits
Figure 6. DC parameter Figure 7. Load regulation Figure 8. Ripple rejection
5 Electrical characteristics
VI = 10 V, IO = 1 A, TJ = 0 to 125 °C (L7805AC), TJ = -40 to 125 °C (L7805AB), unless otherwise specified. Table 3. Electrical characteristics of L7805A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA.
Electrical characteristics
VI = 11 V, IO = 1 A, TJ = 0 to 125 °C (L7806AC), TJ = -40 to 125 °C (L7806AB), unless otherwise specified. Table 4. Electrical characteristics of L7806A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA.
VI = 14 V, IO = 1 A, TJ = 0 to 125 °C (L7808AC), TJ = -40 to 125 °C (L7808AB), unless otherwise specified. Table 5. Electrical characteristics of L7808A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA.
VI = 15 V, IO = 1 A, TJ = 0 to 125 °C (L7809AC), TJ = -40 to 125 °C (L7809AB), unless otherwise specified(Minimum load current for regulation is 5 mA.) Table 6. Electrical characteristics of L7809A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA.
VI = 19 V, IO = 1 A, TJ = 0 to 125 °C (L7812AC), TJ = -40 to 125 °C (L7812AB), unless otherwise specified. Table 7. Electrical characteristics of L7812A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 10/55
VI = 23 V, IO = 1 A, TJ = 0 to 125 °C (L7815AC), TJ = -40 to 125 °C (L7815AB), unless otherwise specified. Table 8. Electrical characteristics of L7815A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 11/55
VI = 33 V, IO = 1 A, TJ = 0 to 125 °C (L7824AC), TJ = -40 to 125 °C (L7824AB), unless otherwise specified. Table 9. Electrical characteristics of L7824A
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 12/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 10 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 10. Electrical characteristics of L7805C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 13/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 11 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 11. Electrical characteristics of L7806C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 14/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 14 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 12. Electrical characteristics of L7808C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 15/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 14.5 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 13. Electrical characteristics of L7885C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 16/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 15 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 14. Electrical characteristics of L7809C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 17/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 19 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 15. Electrical characteristics of L7812C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 18/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 23 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 16. Electrical characteristics of L7815C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 19/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 26 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 17. Electrical characteristics of L7818C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 20/55
Refer to the test circuits, TJ = 0 to 125 °C, VI = 33 V, IO = 500 mA, CI = 0.33 µF, CO = 0.1 µF unless otherwise specified. Table 18. Electrical characteristics of L7824C
- Load and line regulation are specified at constant junction temperature. Changes in V O due to heating
effects must be taken into account separately. Pulse testing with low duty cycle is used. Note: Minimum load current for regulation is 5 mA. DS0422 - Rev 36 page 21/55
6 Application information
6.1 Design consideration
The L78 Series of fixed voltage regulators are designed with thermal overload protection that shuts down the circuit when subjected to an excessive power overload condition, internal short-circuit protection that limits the maximum current the circuit will pass, and output transistor safe-area compensation that reduces the output short- circuit current as the voltage across the pass transistor is increased. In many low current applications, compensation capacitors are not required. However, it is recommended that the regulator input be bypassed with capacitor if the regulator is connected to the power supply filter with long lengths, or if the output load capacitance is large. An input bypass capacitor should be selected to provide good high frequency characteristics to insure stable operation under all load conditions. A 0.33 µF or larger tantalum, mylar or other capacitor having low internal impedance at high frequencies should be chosen. The bypass capacitor should be mounted with the shortest possible leads directly across the regulators input terminals. Normally good construction techniques should be used to minimize ground loops and lead resistance drops since the regulator has no external sense lead. The addition of an operational amplifier allows adjustment to higher or intermediate values while retaining regulation characteristics. The minimum voltage obtained with the arrangement is 2 V greater than the regulator voltage. The circuit of Figure 14. High current voltage regulator can be modified to provide supply protection against short circuit by adding a short circuit sense resistor, RSC, and an additional PNP transistor. The current sensing PNP must be able to handle the short circuit current of the three terminal regulator Therefore a four ampere plastic power transistor is specified. Figure 9. Fixed output regulator
- Although no output capacitor is need for stability, it does improve transient response.
- Required if regulator is located an appreciable distance from power supply filter.
Application information
DS0422 - Rev 36 page 22/55
7 Typical performance
Figure 29. Dropout voltage vs junction temperature Figure 30. Peak output current vs input/output differential Figure 31. Supply voltage rejection vs frequency Figure 32. Output voltage vs junction temperature
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. L78
Package information
DS0422 - Rev 36 page 32/55
8.1 TO-220 (dual gauge) package information
Figure 38. TO-220 (dual gauge) package outline
Table 19. TO-220 (dual gauge) mechanical data
8.2 TO-220 (single gauge) package information
Figure 39. TO-220 (single gauge) package outline
Table 20. TO-220 (single gauge) mechanical data
8.3 TO-220FP type A package information
Figure 40. TO-220FP package outline
Table 21. TO-220FP package mechanical data
8.4 TO-220 (single/dual) packing information
Figure 41. Tube for TO-220 (dual gauge) (mm.)
Figure 42. Tube for TO-220 (single gauge) (mm.)
8.5 DPAK package information
Figure 43. DPAK package outline
Table 22. DPAK mechanical data
Figure 44. DPAK recommended footprint (dimensions are in mm)
8.6 D²PAK (SMD 2L STD-ST) type A package information
Figure 45. D²PAK (SMD 2L STD-ST) type A package outline
Table 23. D²PAK (SMD 2L STD-ST) mechanical data
8.7 D²PAK (ASE) type B package information
Figure 46. D²PAK (ASE subcon) type B package outline
Table 24. D²PAK (ASE) type B mechanical data
Figure 47. D²PAK recommended footprint (dimensions are in mm)
8.8 D²PAK and DPAK packing information
Figure 48. Tape outline
Figure 49. Reel outline Table 25. D²PAK tape and reel mechanical data
Table 26. DPAK tape and reel mechanical data
9 Ordering information
Table 27. Order codes
Ordering information
DS0422 - Rev 36 page 50/55
Revision history
Table 28. Document revision history 21-Jun-2004 12 Document updating. 03-Aug-2006 13 Order codes has been updated and new template. 19-Jan-2007 14 D²PAK mechanical data has been updated and add footprint data. 31-May-2007 15 Order codes has been updated. 29-Aug-2007 16 Added Table 1 in cover page. 11-Dec-2007 17 Modified: Table 27. page 37. Modified: Table 27 on page 58. data on page 52. Modified: Table 27 on page 58. on page 39, Figure 40 on page 45 and Figure 41 on page 45. 04-Mar-2010 21 Added notes Figure 38 on page 38. 08-Sep-2010 22 Modified Table 27 on page 58. 23-Nov-2010 23 Added: TJ = 25 °C test condition in DVO on Table 3, 4, 5, 6, 7, 8 and Table 9. 16-Sep-2011 24 Modified title on page 1. L7812ACV-DG, L7818CV-DG, L7824CV-DG Table 27 on page 58. 27-Mar-2012 27 Added: order codes L7812ABV-DG, L7815ABV-DG Table 27 on page 58. L7824ACV-DG Table 27 on page 58. 19-Sep-2012 30 Modified load regulation units from V to mV in Table 3 to Table 9. 12-Mar-2013 31 Modified: VO output voltage at 25 °C min. value 14.4 V Table 16 on page 23. Part numbers L78xx, L78xxC, L78xxAB, L78xxAC changed to L78. Section 8: Package information and Table 27: Order codes. Added Section 9: Packaging mechanical data. Updated Section 8: Package information. Updated Section 9: "Ordering information". 25-May-2018 35 Updated D²PAK package Section 8.7 D²PAK (ASE) type B package information. 17-Sep-2018 36 Updated Figure 29. Dropout voltage vs junction temperature.