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 DPAK The L79xxAC series of three-terminal negative regulators is available in TO-220 and DPAK 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. Table 1. Device summary Order codes Part numbers TO-220 L7905AC L7912AC L7915AC DPAK Output voltages L7905ACV L7905ACV-DG (1) L7912ACV L7912ACV-DG (1) -12 V L7915ACV-DG (1) -15 V L7915ACV L7905ACD2T-TR -5 V 1. TO-220 Dual Gauge frame. February 2012 Doc ID 2150 Rev 13 1/22 www.st.com 22 Contents L79xxAC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 2/22 Doc ID 2150 Rev 13 L79xxAC Diagram 1 Diagram Figure 1. Schematic diagram Doc ID 2150 Rev 13 3/22 Pin configuration L79xxAC 2 Pin configuration Figure 2. Pin connections (top view) DPAK TO-220 4/22 Doc ID 2150 Rev 13 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. Functional operation under these condition is not implied. Table 3. Thermal data Symbol Parameter RthJC Thermal resistance junction-case RthJA Thermal resistance junction-ambient Doc ID 2150 Rev 13 DPAK TO-220 Unit 3 5 C/W 62.5 50 C/W 5/22 Application L79xxAC 4 Application Figure 3. Application circuit 6/22 Doc ID 2150 Rev 13 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 F, CO = 1 F unless otherwise specified. Table 4. Symbol Electrical characteristics of L7905AC Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25C -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 -5.2 V VO(1) Line regulation VO(1) Load regulation Id Id VO/T Quiescent current Quiescent current change VI = -7 to -25 V, TJ = 25C 100 VI = -8 to -12 V, TJ = 25C 50 IO = 5 mA to 1.5 A, TJ = 25C 100 IO = 250 to 750 mA, TJ = 25C 50 TJ = 25C 3 mV mV IO = 5 mA to 1 A 0.5 VI = -8 to -25 V 1.3 mA mA Output voltage drift IO = 5 mA -0.4 mV/C Output noise voltage B = 10Hz to 100kHz, TJ = 25C 100 V Supply voltage rejection VI = 10 V, f = 120Hz 60 dB Vd Dropout voltage IO = 1 A, TJ = 25C, VO = 100 mV 1.4 V Isc Short circuit current 2.1 A Iscp Short circuit peak current 2.5 A eN SVR TJ = 25C 54 1. Load and line regulation are specified 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. Doc ID 2150 Rev 13 7/22 Electrical characteristics L79xxAC Refer to the test circuits, TJ = 0 to 125 C, VI = -19 V, IO = 500 mA, CI = 2.2 F, CO = 1 F unless otherwise specified. Table 5. Symbol Electrical characteristics of L7912AC Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25C -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 -12.5 V VO(1) Line regulation VO(1) Load regulation Id Id VO/T Quiescent current Quiescent current change VI = -14.5 to -30 V, TJ = 25C 240 VI = -16 to -22 V, TJ = 25C 120 IO = 5 mA to 1.5 A, TJ = 25C 240 IO = 250 to 750 mA, TJ = 25C 120 mV mV TJ = 25C 3 IO = 5 mA to 1 A 0.5 VI = -15 to -30 V 1 mA mA Output voltage drift IO = 5 mA -0.8 mV/C Output noise voltage B = 10Hz to 100kHz, TJ = 25C 200 V Supply voltage rejection VI = 10 V, f = 120Hz 60 dB Vd Dropout voltage IO = 1 A, TJ = 25C, VO = 100 mV 1.1 V Isc Short circuit current 1.5 A Iscp Short circuit peak current 2.5 A eN SVR TJ = 25C 54 1. Load and line regulation are specified 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. 8/22 Doc ID 2150 Rev 13 L79xxAC Electrical characteristics Refer to the test circuits, TJ = 0 to 125 C, VI = -23 V, IO = 500 mA, CI = 2.2 F, CO = 1 F unless otherwise specified. Table 6. Symbol Electrical characteristics of L7915AC Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25C -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 -15.6 V VO(1) Line regulation VO(1) Load regulation Id Id VO/T Quiescent current Quiescent current change VI = -17.5 to -30 V, TJ = 25C 300 VI = -20 to -26 V, TJ = 25C 150 IO = 5 mA to 1.5 A, TJ = 25C 300 IO = 250 to 750 mA, TJ = 25C 150 mV mV TJ = 25C 3 IO = 5 mA to 1 A mA 0.5 mA VI = -18.5 to -30 V 1 Output voltage drift IO = 5 mA -0.9 mV/C Output noise voltage B = 10Hz to 100kHz, TJ = 25C 250 V Supply voltage rejection VI = 10 V, f = 120Hz 60 dB Vd Dropout voltage IO = 1 A, TJ = 25C, VO = 100 mV 1.1 V Isc Short circuit current 1.3 A Iscp Short circuit peak current 2.5 A eN SVR TJ = 25C 54 1. Load and line regulation are specified 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. Doc ID 2150 Rev 13 9/22 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. 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. Figure 5. Split power supply ( 15 V - 1 A) (*) Against potential latch-up problems. 10/22 Doc ID 2150 Rev 13 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. High current negative regulator (-5 V / 4 A with 5 A current limiting) IN OUT GND Doc ID 2150 Rev 13 11/22 Package mechanical data 7 L79xxAC Package mechanical data In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK(R) packages, depending on their level of environmental compliance. ECOPACK(R) specifications, grade definitions and product status are available at: www.st.com. ECOPACK(R) 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 4.60 b 0.61 0.88 0.61 0.88 b1 1.14 1.70 1.14 1.70 c 0.48 0.70 0.48 0.70 D 15.25 15.75 15.25 15.75 D1 Note: Typ. 1.27 E 10.00 10.40 10.00 10.40 e 2.40 2.70 2.40 2.70 e1 4.95 5.15 4.95 5.15 F 1.23 1.32 0.51 0.60 H1 6.20 6.60 6.20 6.60 J1 2.40 2.72 2.40 2.72 L 13.00 14.00 13.00 14.00 L1 3.50 3.93 3.50 3.93 L20 16.40 16.40 L30 28.90 28.90 P 3.75 3.85 3.75 3.85 Q 2.65 2.95 2.65 2.95 In spite of some difference in tolerances, the packages are compatible. Doc ID 2150 Rev 13 L79xxAC Figure 8. Package mechanical data Drawing dimension TO-220 (type STD-ST Dual Gauge) 0015988_S Doc ID 2150 Rev 13 13/22 Package mechanical data Figure 9. L79xxAC Drawing dimension TO-220 (type STD-ST Single Gauge) 8174627_B 14/22 Doc ID 2150 Rev 13 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.) Doc ID 2150 Rev 13 15/22 Package mechanical data L79xxAC Figure 12. Drawing dimension DPAK (type STD-ST) 0079457/L 16/22 Doc ID 2150 Rev 13 L79xxAC Package mechanical data Figure 13. Drawing dimension DPAK (type WOOSEOK-subcon.) 0079457/L Doc ID 2150 Rev 13 17/22 Package mechanical data Table 8. DPAK 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 1.40 L2 1.30 1.75 1.20 1.60 R V2 18/22 Type STD-ST A e Note: L79xxAC 5.08 0.4 0 15.30 15.60 0.30 8 0 3 The DPAK package coming from the subcontractor WOOSEOK is fully compatible with the ST's package suggested footprint. Doc ID 2150 Rev 13 L79xxAC Package mechanical data Figure 14. DPAK 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 0.200 Doc ID 2150 Rev 13 19/22 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 0.476 Doc ID 2150 Rev 13 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. 09-Feb-2012 13 Added: order code L7905ACV-DG Table 1 on page 1. Doc ID 2150 Rev 13 21/22 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. 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