L79xxC Negative voltage regulators Features ■ Output current up to 1.5 A ■ Output voltages of -5; -8; -12; -15; -20 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. D2PAK 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 D PAK TO-220FP L7905C L7905CV L7905CD2T-TR L7905CP L7908C L7908CV L7912C L7912CV L7912CD2T-TR L7912CP -12 V L7915C L7915CV L7915CD2T-TR L7915CP -15 V L7920C 1. Output voltages TO-220 (A type) 2 -5 V -8 V L7920CD2T-TR (1) -20 V Available on request. July 2008 Rev 16 1/21 www.st.com 21 Contents L79xxC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Test circuit 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 ................................................ 6 L79xxC Diagram 1 Diagram Figure 1. Schematic diagram 3/21 Pin configuration L79xxC 2 Pin configuration Figure 2. Pin connections (top view) TO-220 TO220FP D2PAK (any type) 4/21 L79xxC 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 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 3 5 °C/W 62.5 50 60 °C/W 5/21 Test circuit L79xxC 4 Test circuit Figure 3. Test circuit 6/21 L79xxC Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of L7905C (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) Symbol 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. 7/21 Electrical characteristics Table 5. Symbol L79xxC Electrical characteristics of L7908C (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) 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. Table 6. Symbol Electrical characteristics of L7912C (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) 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. 8/21 L79xxC Electrical characteristics Table 7. Electrical characteristics of L7915C (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) Symbol 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. Table 8. Symbol Electrical characteristics of L7920C (refer to the test circuits, TJ = 0 to 125 °C, VI = -29 V, IO = 500 mA, CI = 2.2 µF, CO = 1 µF unless otherwise specified) Parameter Test conditions VO Output voltage TJ = 25°C VO Output voltage IO = -5 mA to -1 A, PO ≤ 15 W VI = -24 to -35 V ΔVO(1) Line regulation ΔVO(1) Load regulation Id ΔId ΔVO/ΔT Quiescent current Quiescent current change Min. Typ. Max. Unit -19.2 -20 -20.8 V -19 -20 -21 V VI = -23 to -35 V, TJ = 25°C 400 VI = -26 to -32 V, TJ = 25°C 200 IO = 5 mA to 1.5 A, TJ = 25°C 400 IO = 250 to 750 mA, TJ = 25°C 200 mV mV TJ = 25°C 3 IO = 5 mA to 1 A 0.5 VI = -24 to -35 V 1 mA mA Output voltage drift IO = 5 mA -1.1 mV/°C Output noise voltage B = 10Hz to 100kHz, TJ = 25°C 350 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 0.9 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. 9/21 Application information 6 Application information Figure 4. Fixed output regulator L79xxC 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. 10/21 L79xxC 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 11/21 Package mechanical data 7 L79xxC 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. 12/21 L79xxC Package mechanical data TO-220 (A type) mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 4.40 4.60 0.173 0.181 b 0.61 0.88 0.024 0.035 b1 1.15 1.70 0.045 0.067 c 0.49 0.70 0.019 0.028 D 15.25 15.75 0.600 0.620 E 10.0 10.40 0.394 0.409 e 2.4 2.7 0.094 0.106 e1 4.95 5.15 0.195 0.203 F 1.23 1.32 0.048 0.052 H1 6.2 6.6 0.244 0.260 J1 2.40 2.72 0.094 0.107 L 13.0 14.0 0.512 0.551 L1 3.5 3.93 0.138 0.155 L20 16.4 0.646 L30 28.9 1.138 φP 3.75 3.85 0.148 0.152 Q 2.65 2.95 0.104 0.116 0015988/N 13/21 Package mechanical data L79xxC TO-220FP mechanical data Dim. mm. Min. A 4.40 Typ inch. Max. Min. Typ. Max. 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 0.409 L2 L3 16 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 14/21 L79xxC Figure 8. Package mechanical data Drawing dimension D2PAK (type STD-ST) 0079457/L 15/21 Package mechanical data Figure 9. L79xxC Drawing dimension D2PAK (type WOOSEOK-subcon.) 0079457/L 16/21 L79xxC Table 9. Package mechanical data D2PAK mechanical data Dim. Min. Type WOOSEOK-subcon. mm. mm. Typ. Max. Min. Typ. Max. A 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 e 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 Note: Type STD-ST 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. 17/21 Package mechanical data L79xxC Figure 10. D2PAK footprint recommended data Table 10. Footprint data Values 18/21 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 L79xxC Package mechanical data Tape & reel D2PAK-P2PAK-D2PAK/A-P2PAK/A mechanical data mm. inch. Dim. Min. Typ. A Max. Min. Typ. 180 13.0 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 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 19/21 Revision history L79xxC 8 Revision history Table 11. Document revision history Date Revision 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. 20/21 Changes L79xxC 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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