Datasheet

ManualsBrandsST ManualsIntegrated Circuits (ICs)Linear Fixed Voltage Regulator TO-220FP -12V 1.5A

TO-220

TO-220FP

D PAK

Features

• Output current up to 1.5 A

• Output voltages: -5, -8, -12, and -5 V

• Thermal overload protection

• Short-circuit protection

• Output 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.

Maturity status link

L79

Negative voltage regulators

L79

Datasheet

DS0428 - Rev 24 - January 2019

For further information contact your local STMicroelectronics sales office.

www.st.com

Summary of content (29 pages)

PAGE 1
L79 Datasheet Negative voltage regulators Features 1 3 D 2 PAK 1 TO-220FP 1 2 2 3 • • • • • • Output current up to 1.
PAGE 2
L79 Diagram 1 Diagram Figure 1.
PAGE 3
L79 Pin configuration 2 Pin configuration Figure 2.
PAGE 4
L79 Maximum ratings 3 Maximum ratings Table 1. Absolute maximum ratings Symbol Note: Parameter Value Unit -35 V VI DC input voltage IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range TOP Operating junction temperature range -65 to 150 for L79xxC 0 to 150 for L79xxAC 0 to 125 °C °C Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
PAGE 5
L79 Test circuit 4 Test circuit Figure 3. Test circuit CO = 1 µF CI = 2.
PAGE 6
L79 Electrical characteristics 5 Electrical characteristics Refer to the test circuits, TJ = 0 to 125 °C, VI = -10 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified. Table 3. Electrical characteristics of L7905AC Symbol Parameter VO Output voltage VO Output voltage ΔVO (1) Line regulation ΔVO (1) Load regulation Id ΔId ΔVO/ΔVT Test conditions TJ = 25 °C IO = -5 mA to -1 A, PO ≤ 15 W VI = -8 to -20 V Quiescent current Quiescent current change Min. Typ. Max. Unit -4.
PAGE 7
L79 Electrical characteristics Symbol ΔId ΔVO/ΔT Parameter Test conditions Quiescent current change Min. Typ. Max. IO = 5 mA to 1 A 0.5 VI = -8 to -25 V 1.3 Unit mA Output voltage drift IO = 5 mA -0.4 mV/°C Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 100 µV Supply voltage rejection ΔVI = 10 V, f = 120 Hz 60 dB Vd Dropout voltage IO = 1 A, TJ = 25 °C, ΔVO = 100 mV 1.4 V Isc Short circuit current 1.8 A eN SVR 54 1.
PAGE 8
L79 Electrical characteristics Refer to the test circuits, TJ = 0 to 125 °C, VI = -19 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified. Table 6. Electrical characteristics of L7912AC Symbol Parameter VO Output voltage VO Output voltage ΔVO (1) Line regulation ΔVO (1) Load regulation Id ΔId ΔVO/ΔT eN SVR Test conditions TJ = 25 °C IO = -5 mA to -1 A, PO ≤ 15 W VI = -15.5 to -27 V Min. Typ. Max. Unit -11.75 -12 -12.25 V -11.5 -12 -12.5 V VI = -14.
PAGE 9
L79 Electrical characteristics Symbol ΔId ΔVO/ΔT Parameter Test conditions Quiescent current change Min. Typ. Max. IO = 5 mA to 1 A 0.5 VI = -15 to -30 V 1 Unit mA Output voltage drift IO = 5 mA -0.8 mV/°C Output noise voltage B = 10 Hz to 100 kHz, TJ = 25 °C 200 µV Supply voltage rejection ΔVI = 10 V, f = 120Hz 60 dB Vd Dropout voltage IO = 1 A, TJ = 25 °C, ΔVO = 100 mV 1.1 V Isc Short circuit current 1.0 A eN SVR 54 1.
PAGE 10
L79 Electrical characteristics Refer to the test circuits, TJ = 0 to 125 °C, VI = -23 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified. Table 9. Electrical characteristics of L7915C Symbol Parameter VO Output voltage VO Output voltage ΔVO (1) Line regulation ΔVO (1) Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change Test conditions TJ = 25 °C IO = -5 mA to -1 A, PO ≤ 15 W VI = -18.5 to -30 V Min. Typ. Max. Unit -14.4 -15 -15.6 V -14.3 -15 -15.
PAGE 11
L79 Application information 6 Application information Figure 4. Fixed output regulator CO = 1 µF CI = 2.2 µF GND -VI Note: IN L79 -VI OUT CI is required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used, at least ten times value should be selected. CO is required if regulator is located an appreciable distance from power supply filter. To improve transient response.
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L79 Application information Figure 6. Circuit for increasing output voltage Figure 7. High current negative regulator (-5 V / 4 A with 5 A current limiting) 0.2Ω 2N3055 Q1 -10V -5V Q2 IN BD175 5.6Ω L7905 GND OUT 1µF 2.
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L79 Package information 7 Package information 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. 7.1 TO-220 (single gauge) package information Figure 8.
PAGE 14
L79 TO-220 (single gauge) package information Table 10. TO-220 (single gauge) package mechanical data Dim. DS0428 - Rev 24 mm Min. Typ. Max. A 4.40 4.60 b 0.61 0.88 b1 1.14 1.70 c 0.48 0.70 D 15.25 15.75 E 10.00 10.40 e 2.40 2.70 e1 4.95 5.15 F 0.51 0.60 H1 6.20 6.60 J1 2.40 2.72 L 13.00 14.00 L1 3.50 3.93 L20 16.40 L30 28.90 ΦP 3.75 3.85 Q 2.65 2.
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L79 TO-220 type A package information 7.2 TO-220 (dual gauge) package information Figure 9.
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L79 TO-220 type A package information Table 11. TO-220 type A package mechanical data Dim. mm Min. Max. A 4.40 4.60 b 0.61 0.88 b1 1.14 1.55 c 0.48 0.70 D 15.25 15.75 D1 DS0428 - Rev 24 Typ. 1.27 E 10.00 10.40 e 2.40 2.70 e1 4.95 5.15 F 1.23 1.32 H1 6.20 6.60 J1 2.40 2.72 L 13.00 14.00 L1 3.50 3.93 L20 16.40 L30 28.90 øP 3.75 3.85 Q 2.65 2.
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L79 TO-220FP package information 7.3 TO-220FP package information Figure 10.
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L79 TO-220FP package information Table 12. TO-220FP package mechanical data Dim. mm Min. Max. A 4.4 4.6 B 2.5 2.7 D 2.5 2.75 E 0.45 0.7 F 0.75 1 F1 1.15 1.70 F2 1.15 1.70 G 4.95 5.2 G1 2.4 2.7 H 10 10.4 L2 DS0428 - Rev 24 Typ. 16 L3 28.6 30.6 L4 9.8 10.6 L5 2.9 3.6 L6 15.9 16.4 L7 9 9.3 Dia 3 3.
PAGE 19
L79 D²PAK (TO-263) type A package information 7.4 D²PAK (TO-263) type A package information Figure 11.
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L79 D²PAK (TO-263) type A package information Table 13. D²PAK (TO-263) type A package mechanical data Dim. mm Min. Max. A 4.40 4.60 A1 0.03 0.23 b 0.70 0.93 b2 1.14 1.70 c 0.45 0.60 c2 1.23 1.36 D 8.95 9.35 D1 7.50 7.75 8.00 D2 1.10 1.30 1.50 E 10.00 E1 8.30 8.50 8.70 E2 6.85 7.05 7.25 e 10.40 2.54 e1 4.88 5.28 H 15.00 15.85 J1 2.49 2.69 L 2.29 2.79 L1 1.27 1.40 L2 1.30 1.75 R V2 DS0428 - Rev 24 Typ. 0.
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L79 D²PAK (TO-263) type A package information Figure 12.
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L79 D²PAK packing information 7.5 D²PAK packing information Figure 13.
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L79 D²PAK packing information Figure 14. D²PAK reel outline T 40mm min. access hole at slot location B D C N A G measured at hub Tape slot in core for tape start 2.5mm min.width Full radius AM06038v1 Table 14. D²PAK tape and reel mechanical data Tape Dim. DS0428 - Rev 24 Reel mm mm Dim. Min. Max. Min. A0 10.5 10.7 A B0 15.7 15.9 B 1.5 D 1.5 1.6 C 12.8 D1 1.59 1.61 D 20.2 E 1.65 1.85 G 24.4 F 11.4 11.6 N 100 K0 4.8 5.0 T Max. 330 13.2 26.4 30.4 P0 3.
PAGE 24
L79 Device summary 8 Device summary Table 15.
PAGE 25
L79 Revision history Table 16. Document revision history Date Revision Changes 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 26
L79 Contents Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 4 Test circuit .
PAGE 27
L79 List of tables List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Table 13. Table 14. Table 15. Table 16. Absolute maximum ratings . . . . . . . . . . . . . . . . Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . Electrical characteristics of L7905AC . . . . . . . . . Electrical characteristics of L7905C . . . . . . . . . . Electrical characteristics of L7908C . . . . . . . . . .
PAGE 28
L79 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. DS0428 - Rev 24 Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fixed output regulator . . . . . . . . . . . . .
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L79 IMPORTANT NOTICE – PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.