L79 STMICROELECTRONICS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 28

Technical content

Datasheet sections

  • 1 Diagram
  • 2 Pin configuration
  • 3 Maximum ratings
  • 4 Test circuit
  • 5 Electrical characteristics
  • 6 Application information
  • 7 Package mechanical data
  • 8 Packaging mechanical data
  • 9 Revision history

Features

  • Output current up to 1.5 A
  • Output voltages of - 5; - 8; - 12; - 15 V
  • Thermal overload protection
  • Short circuit protection
  • Output transition SOA protection
  • Output tolerance 2% (AC version) or 4% (C version) at 25°C

Description

The L79 series of three-terminal negative regulators is available in TO-220, TO-220FP and D²PAK 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; furthermore, having the same voltage option as the L78 positive standard series, they are particularly suited for split power supplies. If adequate heat sinking is provided, they can deliver over 1.5 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-220FP D²PAK Table 1. Device summary

1 Diagram

Figure 1. Schematic diagram

2 Pin configuration

Figure 2. Pin connections (top view)

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

4 Test circuit

Figure 3. Test circuit

5 Electrical characteristics

Table 4. Electrical characteristics of L7905AC

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

Table 5. Electrical characteristics of L7905C

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

Table 6. Electrical characteristics of L7908C

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

Table 7. Electrical characteristics of L7912AC

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

Table 8. Electrical characteristics of L7912C

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

Table 9. Electrical characteristics of L7915AC

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

Table 10. Electrical characteristics of L7915C

  1. Load and line regulation are specified at cons tant junction temperature. Changes in V O due to heating effects must be

taken into account separately. Pulse testing with low duty cycle is used.

6 Application information

should be introduced to protect the device from momentary input short circuit. (*) Against potential latch-up problems. Figure 4. Fixed output regulator Figure 5. Split power supply (± 15 V - 1 A)

7 Package mechanical data

specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 8. TO-220 (single gauge) drawing

Table 11. TO-220 (single gauge) mechanical data

Figure 9. TO-220 (dual gauge) drawing

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

Figure 10. TO-220FP drawing

Table 13. TO-220FP mechanical data

Figure 11. D²PAK drawing

Table 14. D²PAK mechanical data

Figure 12. D²PAK footprint(a) a. All dimensions are in millimeters.

8 Packaging mechanical data

Figure 13. Tape

Figure 14. Reel Table 15. D²PAK tape and reel mechanical data

9 Revision history

Table 16. Document revision history 22-Jun-2004 9 Order codes updated Table 3. 31-Aug-2005 10 Add new order codes (TO-220 E Type) on Table 3. 19-Jan-2007 11 D²PAK mechanical data updated and add footprint data. 06-Jun-2007 12 Order codes updated. 25-Oct-2007 13 Modified: Figure 3, Figure 4, Figure 6 and Figure 7. 05-Dec-2007 14 Modified: Table 1. 18-Feb-2008 15 Modified: Table 1 on page 1. 15-Jul-2008 16 Modified: Table 1 on page 1. page 17, Figure 10 and Figure 11 on page 18. 26-May-2010 18 Modified: V I parameter Table 2 on page 5. 12-Nov-2010 19 Modified: R thJC value for TO-220 Table 3 on page 5. 15-May-2012 21 Added: order codes L7908CV-DG Table 1 on page 1. Part numbers L79xxC and L79xxAC changed to L79. Updated the features and the description in cover page. information, Section 7: Package mechanical data. Added Section 8: Packaging mechanical data.