L79xxC_08 STMICROELECTRONICS | Alldatasheet
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 21
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 Revision history
Features
■ Output current up to 1.5 A ■ Output voltages of -5; -8; -12; -15; -20 V ■ Thermal overload protection ■ Short circuit protection ■ Output transition SOA protection
Description
The L79XXC series of three-terminal negative regulators is available in TO-220, TO-220FP and D 2PAK 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 L78XX 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-220FP D2PAK TO-220 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 L7905C (refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V,
- Load and line regulation are spec ified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Table 5. Electrical characteristics of L7908C (refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V,
- Load and line regulation are spec ified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used. Table 6. Electrical characteristics of L7912C (refer to the test circuits, TJ = 0 to 125 °C, VI = -19 V,
- Load and line regulation are spec ified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
Table 7. Electrical characteristics of L7915C (refer to the test circuits, TJ = 0 to 125 °C, VI = -23 V,
- Load and line regulation are spec ified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used. Table 8. Electrical characteristics of L7920C (refer to the test circuits, TJ = 0 to 125 °C, VI = -29 V,
- Load and line regulation are spec ified at constant junction temperature. Changes in VO due to heating effects must be
taken into account separately. Pulse testing with low duty cycle is used.
6 Application information
- To specify an output voltage, substitute voltage value for "XX".
- Required for stability. For value give n, capacitor must be solid tantalum. If aluminium electrolytic are used,
- To improve transient response. If large capacitors are used, a high current diode from input to output
(1N4001 or similar) 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)
Package mechanical data L79xxC
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
L79xxC Package mechanical data Dim. mm. inch. A 4.40 4.60 0.17 3 0.181 b 0.61 0. 88 0.024 0.0 35 b1 1.15 1.70 0.045 0.067 c0 . 4 9 0.70 0.01 9 0.028 D 15.25 15.75 0.600 0.620 E 10.0 10.40 0. 394 0.40 9 e 2.4 2.7 0.0 94 0.106 e1 4. 95 5.15 0.1 95 0.20 3 F1 . 2 3 1.32 0.04 8 0.052 H1 6.2 6.6 0.244 0.260 J1 2.40 2.72 0.0 94 0.107 L1 3.0 14.0 0.512 0.551 L1 3.5 3.93 0.138 0.155 L20 16.4 0.646 L302 8.9 1.138 φP 3.75 3.85 0.14 8 0.152 Q 2.65 2. 95 0.104 0.116 TO-220 (A type) mechanical data 0015988/N
Package mechanical data L79xxC Dim. mm. inch. A 4.40 4.60 0.17 3 0.181 B 2.5 2.7 0.0 98 0.106 D 2.5 2.75 0.0 98 0.108 E 0.45 0.70 0.017 0.027 F 0.75 1 0.0 300 . 0 39 F1 1.15 1.50 0.045 0.05 9 F2 1.15 1.50 0.045 0.05 9 G4 . 95 5.2 0.1 94 0.204 G1 2.4 2.7 0.0 94 0.106 H 10.0 10.40 0. 393 0.409 L2 16 0.6 30 L3 28.6 30.6 1.126 1.204 L4 9.8 10.6 0. 3850 . 4 1 7 L5 2. 93 .6 0.114 0.142 L6 15. 9 16.4 0.626 0.645 L7 99 .3 0.354 0. 366 DIA. 33 .2 0.11 8 0.126 TO-220FP mechanical data 7012510A-H
Figure 8. Drawing dimension D 2PAK (type STD-ST)
Figure 9. Drawing dimension D 2PAK (type WOOSEOK-subcon.)
ST's package suggested footprint. Table 9. D 2PAK mechanical data Type STD-ST Type WOOSEOK-subcon.
Figure 10. D 2PAK footprint recommended data Table 10. Footprint data
L79xxC Package mechanical data Dim. mm. inch. A1 80 7.0 86 D 20.2 0.7 95 N6 0 2 . 362 T 14.4 0.567 Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data
8 Revision history
Table 11. 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 D 2PAK 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.