L78LxxAB, L78LxxAC, L78LxxC Positive voltage regulators Datasheet -- production data Features Output current up to 100 mA Output voltages of 3.3; 5; 6; 8; 9; 10; 12; 15; 18; 24 V Thermal overload protection Short-circuit protection No external components are required Available in either 4% (AC) or 8% (C) selection TO-92 Description SO-8 The L78Lxx series of three-terminal positive regulators employ internal current limiting and thermal shutdown, making them essentially indestructible. If adequate heat-sink is provided, they can deliver up to 100 mA output current. They are intended as fixed voltage regulators in a wide range of applications including local or oncard regulation for elimination of noise and distribution problems associated with single-point regulation. In addition, they can be used with power pass elements to make high-current voltage regulators. The L78Lxx series used as Zener diode/resistor combination replacement, offers an effective output impedance improvement Table 1. SOT-89 of typically two orders of magnitude, along with lower quiescent current and lower noise. Device summary Part numbers L78L33C L78L08AC L78L15C L78L33AC L78L08AB L78L15AC L78L33AB L78L09C L78L15AB L78L05C L78L09AC L78L18C L78L05AC L78L09AB L78L18AC L78L05AB L78L10AC L78L24C L78L06AC L78L12C L78L24AC L78L06AB L78L12AC L78L24AB L78L08C L78L12AB August 2012 This is information on a product in full production. Doc ID 2145 Rev 20 1/30 www.st.com 30 Contents L78LxxAB, L78LxxAC, L78LxxC Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Typical performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 8 Order codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 2/30 Doc ID 2145 Rev 20 L78LxxAB, L78LxxAC, L78LxxC 1 Diagram Figure 1. Schematic diagram Diagram Doc ID 2145 Rev 20 3/30 Pin configuration L78LxxAB, L78LxxAC, L78LxxC 2 Pin configuration Figure 2. Pin connection (top view, bottom view for TO-92) PIN 1 = VOUT PIN 2 = GND PIN 3 = VIN SO-8 Figure 3. 4/30 SOT-89 Test circuits Doc ID 2145 Rev 20 TO-92 L78LxxAB, L78LxxAC, L78LxxC Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Symbol VI IO PD Parameter DC Input voltage Value VO= 3.3 to 9 V 30 VO= 12 to 15 V 35 VO= 18 to 24 V 40 Output current Unit V 100 Power dissipation mA Internally limited TSTG Storage temperature range TOP Operating junction temperature range (1) -65 to 150 for L78L00AC 0 to 125 for L78L00AB -40 to 125 mW C C 1. Our SO-8 package used for voltage regulators is modified internally to have pins 2, 3, 6 and 7 electrically communed to the die attach flag. This particular frame decreases the total thermal resistance of the package and increases its ability to dissipate power when an appropriate area of copper on the printed circuit board is available for heat-sinking. The external dimensions are the same as for the standard SO-8. Table 3. Symbol RthJC RthJA 1. Thermal data Parameter SO-8 Thermal resistance junction-case. (max) Thermal resistance junction-ambient. (max) TO-92 20 55 (1) 200 SOT-89 Unit 15 C/W 55 (1) C/W Considering 6 cm of copper Board heat-sink. Doc ID 2145 Rev 20 5/30 Electrical characteristics 4 L78LxxAB, L78LxxAC, L78LxxC Electrical characteristics Refer to the test circuits, TJ = 0 to 125 C, IO = 40 mA, CI = 0.33 F, CO = 0.1 F unless otherwise speci