Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsL7905ACV

February 2012 Doc ID 2150 Rev 13 1/22

L79xxAC

2 % negative voltage regulators

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.

D²PAK

TO-220

Table 1. Device summary

Part numbers

Order codes

Output

voltages

TO-220 D²PAK

L7905AC L7905ACV L7905ACV-DG

(1)

L7905ACD2T-TR -5 V

L7912AC L7912ACV L7912ACV-DG

(1)

-12 V

L7915AC L7915ACV L7915ACV-DG

(1)

-15 V

1. TO-220 Dual Gauge frame.

www.st.com

Summary of content (22 pages)

PAGE 1
L79xxAC 2 % negative voltage regulators 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 TO-220 D²PAK The L79xxAC series of three-terminal negative regulators is available in TO-220 and D²PAK packages and several fixed output voltages.
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Contents L79xxAC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics .
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L79xxAC Diagram 1 Diagram Figure 1.
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Pin configuration L79xxAC 2 Pin configuration Figure 2.
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L79xxAC Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value for VO= -5 to -18V -35 for VO= -20, -24V -40 VI DC input voltage IO Output current Internally limited PD Power dissipation Internally limited TSTG Storage temperature range TOP Operating junction temperature range Unit V -65 to 150 °C 0 to 125 °C Note: Absolute maximum ratings are those values beyond which damage to the device may occur.
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Application L79xxAC 4 Application Figure 3.
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L79xxAC 5 Electrical characteristics 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 4. Symbol Electrical characteristics of L7905AC Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -4.9 -5 -5.1 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -8 to -20 V -4.8 -5 -5.
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Electrical characteristics L79xxAC 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 5. Symbol Electrical characteristics of L7912AC Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -11.75 -12 -12.25 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -15.5 to -27 V -11.5 -12 -12.
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L79xxAC 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 6. Symbol Electrical characteristics of L7915AC Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -14.7 -15 -15.3 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -18.5 to -30 V -14.4 -15 -15.
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Application information L79xxAC 6 Application information Figure 4. Fixed output regulator 1. To specify an output voltage, substitute voltage value for "XX". 2. Required for stability. For value given, capacitor must be solid tantalum. If aluminium electrolytic are used, at least ten times value should be selected. C1 is required if regulator is located an appreciable distance from power supply filter. 3. To improve transient response.
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L79xxAC Figure 6. Application information Circuit for increasing output voltage VO=VXX(R1+R2)/R2 VXX/R2 > 3Id GND IN OUT C3 Optional for improved transient response and ripple rejection. Figure 7.
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Package mechanical data 7 L79xxAC 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. Table 7. TO-220 mechanical data Type STD - ST Dual Gauge Type STD - ST Single Gauge mm. mm. Dim. Min. 12/22 Max. Min. Typ. Max. A 4.40 4.60 4.40 4.
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L79xxAC Figure 8.
PAGE 14
Package mechanical data Figure 9.
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L79xxAC Package mechanical data Figure 10. Drawing dimension tube for TO-220 Dual Gauge (mm.) Figure 11. Drawing dimension tube for TO-220 Single Gauge (mm.
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Package mechanical data L79xxAC Figure 12.
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L79xxAC Package mechanical data Figure 13. Drawing dimension D²PAK (type WOOSEOK-subcon.
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Package mechanical data Table 8. D²PAK mechanical data Dim. Min. Type WOOSEOK-subcon. mm. mm. Typ. Max. Min. Typ. Max. 4.40 4.60 4.30 4.70 A1 0.03 0.23 0 0.20 b 0.70 0.93 0.70 0.90 b2 1.14 1.70 1.17 1.37 c 0.45 0.60 0.45 0.50 0.60 c2 1.23 1.36 1.25 1.30 1.40 D 8.95 9.35 9 9.20 9.40 D1 7.50 E 10 E1 8.50 7.50 10.40 9.80 10.20 7.50 2.54 2.54 e1 4.88 5.28 H 15 15.85 15 J1 2.49 2.69 2.20 2.60 L 2.29 2.79 1.79 2.79 L1 1.27 1.40 1 1.
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L79xxAC Package mechanical data Figure 14. D²PAK footprint recommended data Table 9. Footprint data Values Dim. mm. inch. A 12.20 0.480 B 9.75 0.384 C 16.90 0.665 D 3.50 0.138 E 1.60 0.063 F 2.54 0.100 G 5.08 0.
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Package mechanical data L79xxAC Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data mm. inch. Dim. Min. Typ. A Min. Typ. 180 13.0 13.2 Max. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 20/22 Max. 0.504 0.512 14.4 0.519 0.567 Ao 10.50 10.6 10.70 0.413 0.417 0.421 Bo 15.70 15.80 15.90 0.618 0.622 0.626 Ko 4.80 4.90 5.00 0.189 0.193 0.197 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 11.9 12.0 12.1 0.468 0.472 0.
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L79xxAC Revision history 8 Revision history Table 10. Document revision history Date Revision Changes 22-Jun-2004 7 Order codes updated. 12-Dec-2007 8 Added: Table 1. 18-Feb-2008 9 Modified: Table 1 on page 1. 28-Jan-2010 10 Modified: Table 7 on page 12, Figure 8 on page 13, Figure 9 on page 14, Figure 10 and Figure 11 on page 15. 12-Nov-2010 11 Modified: RthJC value for TO-220 Table 3 on page 5. 28-Nov-2011 12 Added: order codes L7912ACV-DG and L7915ACV-DG Table 1 on page 1.
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L79xxAC Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.