L79xxAC STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 20
Technical content
Datasheet sections
- 1 Diagram
- 2 Pin configuration
- 3 Maximum ratings
- 4 Application
- 5 Electrical characteristics
- 6 Application information
- 7 Package mechanical data
- 8 Revision history
Features
■ Output current to 1.5 A ■ Output voltages of -5; -12; -15 V ■ Thermal overload protection ■ Short circuit protection ■ Output transition SOA protection
Description
The L79xxAC series of three-terminal negative regulators is available in TO-220 and D2PAK packages and several fixed output voltages. 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 L78xxA 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. D2PAKTO-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 Application
Figure 3. Application circuit
5 Electrical characteristics
Table 4. Electrical characteristics of L7905AC (refer to the test circuits, TJ = 0 to 125 °C, VI = -10
- 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 L7912AC (refer to the test circuits, TJ = 0 to 125 °C, VI = -19
- 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 L7915AC (refer to the test circuits, TJ = 0 to 125 °C, VI = -23
- 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 L79xxAC
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.
L79xxAC Package mechanical data Dim. mm. inch. A 4.40 4.60 0.17 3 0.181 C1 . 2 3 1.32 0.04 8 0.051 D 2.40 2.72 0.0 94 0.107 D1 1.27 0.050 E0 . 4 9 0.70 0.01 9 0.027 F 0.61 0. 88 0.024 0.0 34 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G4 . 95 5.15 0.1 94 0.20 3 G1 2.4 2.7 0.0 94 0.106 H2 10.0 10.40 0. 393 0.409 L2 16.4 0.645 L4 1 3.0 14.0 0.511 0.551 L5 2.65 2. 95 0.104 0.116 L6 15.25 15.75 0.600 0.620 L7 6.2 6.6 0.244 0.260 L93 .5 3.93 0.137 0.154 TO-220 mechanical data P011C
Figure 8. Drawing dimension D 2PAK (type STD-ST)
Figure 9. Drawing dimension D 2PAK (type WOOSEOK-subcon.)
ST's package suggested footprint. Table 7. D 2PAK mechanical data Type STD-ST Type WOOSEOK-subcon.
Figure 10. D 2PAK footprint recommended data Table 8. Footprint data
Package mechanical data L79xxAC 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 9. Document revision history 22-Jun-2004 7 Order codes updated. 18-Feb-2008 9 Modified: Table 1 on page 1.