L79xxC Negative voltage regulators Datasheet − production data Features ■ Output current up to 1.5 A ■ Output voltages of - 5; - 8; - 12; - 15 V ■ Thermal overload protection ■ Short circuit protection ■ Output transition SOA protection TO-220 TO-220FP Description The L79xxC 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 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. Table 1. D²PAK Device summary Order codes Part numbers TO-220 D²PAK TO-220FP L7905CD2T-TR L7905CP Output voltages L7905C L7905CV L7905CV-DG (1) L7908C L7908CV L7908CV-DG (1) L7912C L7912CV L7912CV-DG (1) L7912CD2T-TR L7912CP - 12 V L7915CV (1) L7915CD2T-TR L7915CP - 15 V L7915C L7915CV-DG -5V -8V 1. TO-220 Dual Gauge frame. May 2012 This is information on a product in full production. Doc ID 2149 Rev 21 1/24 www.st.com 24 Contents L79xxC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 2/24 Doc ID 2149 Rev 21 L79xxC Diagram 1 Diagram Figure 1. Schematic diagram Doc ID 2149 Rev 21 3/24 Pin configuration L79xxC 2 Pin configuration Figure 2. Pin connections (top view) TO-220 TO220FP D²PAK (any type) 4/24 Doc ID 2149 Rev 21 L79xxC Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value for VO = - 5 to - 18 V -35 for VO = - 20 to - 24 V -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 150 °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 D²PAK TO-220 TO-220FP Unit 3 5 5 °C/W 62.5 50 60 °C/W Doc ID 2149 Rev 21 5/24 Test circuit L79xxC 4 Test circuit Figure 3. Test circuit 6/24 Doc ID 2149 Rev 21 L79xxC 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 L7905C Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -4.8 -5 -5.2 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -8 to -20 V -4.75 -5 -5.25 V ΔVO(1) Line regulation ΔVO(1) Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change VI = -7 to -25 V, TJ = 25°C 100 VI = -8 to -12 V, TJ = 25°C 50 IO = 5 mA to 1.5 A, TJ = 25°C 100 IO = 250 to 750 mA, TJ = 25°C 50 TJ = 25°C 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 = 25°C 100 µV Supply voltage rejection ΔVI = 10 V, f = 120Hz 60 dB Vd Dropout voltage IO = 1 A, TJ = 25°C, ΔVO = 100 mV 1.4 V Isc Short circuit current 2.1 A eN SVR 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 2149 Rev 21 7/24 Electrical characteristics L79xxC Refer to the test circuits, TJ = 0 to 125 °C, VI = -14 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified. Table 5. Symbol Electrical characteristics of L7908C Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -7.7 -8 -8.3 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -11.5 to -23 V -7.6 -8 -8.4 V ΔVO(1) Line regulation ΔVO(1) Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change VI = -10.5 to -25 V, TJ = 25°C 160 VI = -11 to -17 V, TJ = 25°C 80 IO = 5 mA to 1.5 A, TJ = 25°C 160 IO = 250 to 750 mA, TJ = 25°C 80 TJ = 25°C 3 mV mV IO = 5 mA to 1 A mA 0.5 mA VI = -11.5 to -25 V 1 Output voltage drift IO = 5 mA -0.6 mV/°C Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 175 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 1.5 A eN SVR 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. 8/24 Doc ID 2149 Rev 21 L79xxC 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. Symbol Electrical characteristics of L7912C Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -11.5 -12 -12.5 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -15.5 to -27 V -11.4 -12 -12.6 V ΔVO(1) Line regulation ΔVO(1) Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change VI = -14.5 to -30 V, TJ = 25°C 240 VI = -16 to -22 V, TJ = 25°C 120 IO = 5 mA to 1.5 A, TJ = 25°C 240 IO = 250 to 750 mA, TJ = 25°C 120 mV mV TJ = 25°C 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 = 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 1.5 A eN SVR 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 2149 Rev 21 9/24 Electrical characteristics L79xxC 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 7. Symbol Electrical characteristics of L7915C Parameter Test conditions Min. Typ. Max. Unit VO Output voltage TJ = 25°C -14.4 -15 -15.6 V VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -18.5 to -30 V -14.3 -15 -15.7 V ΔVO(1) Line regulation ΔVO(1) Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change VI = -17.5 to -30 V, TJ = 25°C 300 VI = -20 to -26 V, TJ = 25°C 150 IO = 5 mA to 1.5 A, TJ = 25°C 300 IO = 250 to 750 mA, TJ = 25°C 150 mV mV TJ = 25°C 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 = 25°C 250 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 1.3 A eN SVR 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. 10/24 Doc ID 2149 Rev 21 L79xxC Application information 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. Doc ID 2149 Rev 21 11/24 Application information Figure 6. L79xxC 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 12/24 Doc ID 2149 Rev 21 L79xxC 7 Package mechanical data 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 8. TO-220 mechanical data Type STD - ST Dual Gauge Type STD - ST Single Gauge mm. mm. Dim. Min. 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 2149 Rev 21 13/24 Package mechanical data Figure 8. L79xxC Drawing dimension TO-220 (type STD-ST Dual Gauge) 0015988_S 14/24 Doc ID 2149 Rev 21 L79xxC Figure 9. Package mechanical data Drawing dimension TO-220 (type STD-ST Single Gauge) 8174627_B Doc ID 2149 Rev 21 15/24 Package mechanical data L79xxC Figure 10. Drawing dimension tube for TO-220 Dual Gauge (mm) Figure 11. Drawing dimension tube for TO-220 Single Gauge (mm) 16/24 Doc ID 2149 Rev 21 L79xxC Package mechanical data TO-220FP mechanical data Dim. mm. Min. Typ inch. Max. Min. Typ. Max. A 4.40 4.60 0.173 0.181 B 2.5 2.7 0.098 0.106 D 2.5 2.75 0.098 0.108 E 0.45 0.70 0.017 0.027 F 0.75 1 0.030 0.039 F1 1.15 1.50 0.045 0.059 F2 1.15 1.50 0.045 0.059 G 4.95 5.2 0.194 0.204 G1 2.4 2.7 0.094 0.106 H 10.0 10.40 0.393 L2 L3 16 0.409 0.630 28.6 30.6 1.126 1.204 L4 9.8 10.6 0.385 0.417 L5 2.9 3.6 0.114 0.142 L6 15.9 16.4 0.626 0.645 L7 9 9.3 0.354 0.366 DIA. 3 3.2 0.118 0.126 7012510A-H Doc ID 2149 Rev 21 17/24 Package mechanical data L79xxC Figure 12. Drawing dimension D²PAK (type STD-ST) 0079457/L 18/24 Doc ID 2149 Rev 21 L79xxC Package mechanical data Figure 13. Drawing dimension D²PAK (type WOOSEOK-subcon.) 0079457/L Doc ID 2149 Rev 21 19/24 Package mechanical data Table 9. 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 1.40 L2 1.30 1.75 1.20 1.60 R V2 20/24 Type STD-ST A e Note: L79xxC 5.08 0.4 0° 15.30 15.60 0.30 8° 0° 3° The D²PAK package coming from the subcontractor WOOSEOK is fully compatible with the ST's package suggested footprint. Doc ID 2149 Rev 21 L79xxC Package mechanical data Figure 14. D²PAK footprint recommended data Table 10. 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 2149 Rev 21 21/24 Package mechanical data L79xxC 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 22/24 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 2149 Rev 21 L79xxC Revision history 8 Revision history Table 11. 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. 19-Jan-2010 17 Modified: Table 8 on page 13, added: Figure 8 on page 14, Figure 9 on page 15, Figure 10 and Figure 11 on page 16. 26-May-2010 18 Modified: VI parameter Table 2 on page 5. 12-Nov-2010 19 Modified: RthJC value for TO-220 Table 3 on page 5. 18-Nov-2011 20 Added: order codes L7905CV-DG, L7912CV-DG and L7915CV-DG Table 1 on page 1. 15-May-2012 21 Added: order codes L7908CV-DG Table 1 on page 1. Doc ID 2149 Rev 21 23/24 L79xxC Please Read Carefully: Information in this document is provided solely in connection with ST products. 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