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. 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 Output voltages TO-220 D2PAK L7905AC L7905ACV L7905ACD2T-TR -5 V L7912AC L7912ACV L7912ACD2T-TR -12 V L7915AC L7915ACV February 2008 -15 V Rev 9 1/20 www.st.com 20 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 L79xxAC Diagram 1 Diagram Figure 1. Schematic diagram 3/20 Pin configuration L79xxAC 2 Pin configuration Figure 2. Pin connections (top view) TO-220 4/20 D2PAK 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 D2PAK TO-220 Unit 3 3 °C/W 62.5 50 °C/W 5/20 Application L79xxAC 4 Application Figure 3. Application circuit 6/20 L79xxAC Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics of L7905AC (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 -4.9 -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 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 Iscp Short circuit peak current 2.5 A eN SVR TJ = 25°C 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. 7/20 Electrical characteristics Table 5. Symbol L79xxAC Electrical characteristics of L7912AC (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 -11.75 -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 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 Iscp Short circuit peak current 2.5 A eN SVR TJ = 25°C 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. 8/20 L79xxAC Table 6. Symbol Electrical characteristics Electrical characteristics of L7915AC (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) 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 -15.6 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 Iscp Short circuit peak current 2.5 A eN SVR TJ = 25°C 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. 9/20 Application information 6 Application information Figure 4. Fixed output regulator L79xxAC 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. 10/20 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 11/20 Package mechanical data 7 L79xxAC 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. 12/20 L79xxAC Package mechanical data TO-220 mechanical data Dim. mm. Min. Typ. inch. Max. Min. Typ. Max. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 0.70 0.019 0.027 D1 E 1.27 0.49 0.050 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 0.409 L2 16.4 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.75 0.600 0.620 L7 6.2 6.6 0.244 0.260 L9 3.5 3.93 0.137 0.154 DIA. 3.75 3.85 0.147 0.151 P011C 13/20 Package mechanical data Figure 8. L79xxAC Drawing dimension D2PAK (type STD-ST) 0079457/L 14/20 L79xxAC Figure 9. Package mechanical data Drawing dimension D2PAK (type WOOSEOK-subcon.) 0079457/L 15/20 Package mechanical data Table 7. 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 16/20 Type STD-ST A e Note: L79xxAC 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. L79xxAC Package mechanical data Figure 10. D2PAK footprint recommended data Table 8. 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 17/20 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 18/20 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 L79xxAC Revision history 8 Revision history Table 9. 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. 19/20 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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