L78S STMICROELECTRONICS | Alldatasheet

Document overview

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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 Packaging mechanical data
  • 9 Revision history

Features

  • Output current up to 2 A
  • Output voltages of 5; 7.5; 9; 10; 12; 15; 18; 24 V
  • Thermal protection
  • Short circuit protection
  • Output transition SOA protection

Description

The L78S series of three-terminal positive regulators is available in TO-220 package 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 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 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 L78S05C

Refer to the test circuits, TJ = 25 °C, VI = 12.5 V, IO = 500 mA, unless otherwise specified. Table 5. Electrical characteristics of L78S75C

Refer to the test circuits, TJ = 25 °C, VI = 14 V, IO = 500 mA, unless otherwise specified. Table 6. Electrical characteristics of L78S09C

Refer to the test circuits, TJ = 25 °C, VI = 15 V, IO = 500 mA, unless otherwise specified. Table 7. Electrical characteristics of L78S10C

Refer to the test circuits, TJ = 25 °C, VI = 19 V, IO = 500 mA, unless otherwise specified. Table 8. Electrical characteristics of L78S12C

Refer to the test circuits, TJ = 25 °C, VI = 23 V, IO = 500 mA, unless otherwise specified. Table 9. Electrical characteristics of L78S15C

Refer to the test circuits, TJ = 25 °C, VI = 26 V, IO = 500 mA, unless otherwise specified. Table 10. Electrical characteristics of L78S18C

Refer to the test circuits, TJ = 25 °C, VI = 33 V, IO = 500 mA, unless otherwise specified. Table 11. Electrical characteristics of L78S24C

6 Typical performance

Figure 8. Dropout voltage vs. junction Figure 9. Peak output current vs. input/output Figure 10. Output impedance vs. frequency Figure 11. Output voltage vs. junction

Figure 32. Reducing power dissipation with dropping resistor

5 BB,

Figure 33. Remote shutdown

Package mechanical data L78S

7 Package mechanical data

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.

Figure 38. TO-220 (dual gauge) drawing

Table 12. TO-220 (dual gauge) mechanical data

Figure 39. TO-220 SG (single gauge) drawing

Table 13. TO-220 SG (single gauge) mechanical data

8 Packaging mechanical data

Figure 40. Tube for TO-220 (dual gauge) (mm.) Figure 41. Tube for TO-220 (single gauge) (mm.)

9 Revision history

Table 14. 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 33. 09-Mar-2012 6 Added: order codes L78S09CV-DG Table 13 on page 35. 15-May-2012 7 Added: order codes L78S75CV-DG and L78S10CV-DG Table 13 on page 35. Part numbers L78Sxx and L78SxxC changed to L78S. Modified the title, the features and the description in cover page. mechanical data, Section 9: Order codes. Added Section 8: Packaging mechanical data.