L78SXX_10 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 39
Technical content
Datasheet sections
- 1 Diagram
- 2 Pin configuration
- 3 Maximum ratings
- 4 Test circuits
- 5 Electrical characteristics
- 6 Typical performance
- 7 Package mechanical data
- 8 Order codes
- 9 Revision history
Features
■ Output current to 2 A ■ Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24 V ■ Thermal overload protection ■ Short circuit protection ■ Output transition SOA protection
Description
The L78Sxx series of three-terminal positive regulators is available in TO-220 and TO-3 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 employs internal current limiting, thermal shut- down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 2 A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. TO-220 TO-3 Table 1. Device summary
1 Diagram
Figure 1. Block diagram
2 Pin configuration
Figure 2. Pin connections (top view) Figure 3. Schematic diagram
3 Maximum ratings
Note: Absolute maximum ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 2. Absolute maximum ratings Table 3. Thermal data Figure 4. Application circuits
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 = 500 mA, unless otherwise specified. Table 4. Electrical characteristics of L78S05
Refer to the test circuits, TJ = 25 °C, VI = 12.5 V, IO = 500 mA, unless otherwise specified. Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 500 mA, unless otherwise specified. Table 5. Electrical characteristics of L78S75 Table 6. Electrical characteristics of L78S09
Refer to the test circuits, TJ = 25 °C, VI = 15 V, IO = 500 mA, unless otherwise specified. Refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 500 mA, unless otherwise specified. Table 7. Electrical characteristics of L78S10 Table 8. Electrical characteristics of L78S12
Refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 500 mA, unless otherwise specified. Refer to the test circuits, TJ = 25 °C, VI = 26 V, IO = 500 mA, unless otherwise specified. Table 9. Electrical characteristics of L78S15 Table 10. Electrical characteristics of L78S18
Refer to the test circuits, TJ = 25 °C, VI = 33 V, IO = 500 mA, unless otherwise specified. Table 11. Electrical characteristics of L78S24
Refer to the test circuits, TJ = 25 °C, VI = 10 V, IO = 500 mA, unless otherwise specified. Table 12. Electrical characteristics of L78S05C
Refer to the test circuits, TJ = 25 °C, VI = 12.5 V, IO = 500 mA, unless otherwise specified. Table 13. Electrical characteristics of L78S75C
Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 500 mA, unless otherwise specified. Table 14. Electrical characteristics of L78S09C
Refer to the test circuits, TJ = 25 °C, VI = 15 V, IO = 500 mA, unless otherwise specified. Table 15. Electrical characteristics of L78S10C
Refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 500 mA, unless otherwise specified. Table 16. Electrical characteristics of L78S12C
Refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 500 mA, unless otherwise specified. Table 17. Electrical characteristics of L78S15C
Refer to the test circuits, TJ = 25 °C, VI = 26 V, IO = 500 mA, unless otherwise specified. Table 18. Electrical characteristics of L78S18C
Refer to the test circuits, TJ = 25 °C, VI = 33 V, IO = 500 mA, unless otherwise specified. Table 19. Electrical characteristics of L78S24C
6 Typical performance
Figure 8. Dropout voltage vs. junction Figure 9. Peak output current vs. Figure 10. Output impedance vs. frequency Figure 11. Output voltage vs. junction Figure 12. Supply voltage rejection vs. Figure 13. Quiescent current vs. junction
- Application with high capacitanc e loads and an output voltage greater than 6 volts need an external diode
may be destroyed. The external diode by-passes the current from the IC to ground. Figure 37. Protection against input s hort-circuit with high capacitance loads
7 Package mechanical data
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. In spite of some difference in tolerances, the packages are compatible. Table 20. TO-220 mechanical data
Note: 1 Maximum resin gate protrusion: 0.5 mm.
2 Resin gate position is accepted in each of the two positions shown on the drawing, or their
Figure 38. Drawing dimension TO-220 (type STD-ST Dual Gauge)
Figure 39. Drawing dimension TO -220 (type STD-ST Single Gauge)
Package mechanical data L78Sxx, L78SxxC 36/39 Doc ID 2148 Rev 4 Dim. mm. inch. A 11. 85 0.466 C 1.70 0.066 D 8.7 0. 342 E 20.0 0.7 87 G 10. 9 0.429 N 16. 9 0.665 P 26.2 1.0 31 R 3.88 4.09 0.152 0.161 U 39.5 1.555 V 30.10 1.1 85 TO-3 mechanical data P003C/C E B R C DAP G N VU O
8 Order codes
Table 21. Order codes
9 Revision history
Table 22. Document revision history 07-Sep-2006 2 Order codes updated. 20-Mar-2008 3 Added: Table 1 on page 1. Figure 40 and Figure 41 on page 35.