L79 Datasheet Negative voltage regulators Features Output current up to 1.5 A 3 Output voltages: -5, -8, -12, and -5 V 1 2 D PAK 3 Thermal overload protection 2 1 Short-circuit protection TO-220FP Output SOA protection Output tolerance 2% (AC version) or 4% (C version) at 25 C 3 2 1 TO-220 Description The L79 series of three-terminal negative regulators is available in TO-220, TO-220FP and DPAK 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 L78 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. Maturity status link L79 DS0428 - Rev 24 - January 2019 www.st.com For further information contact your local STMicroelectronics sales office.L79 Diagram 1 Diagram Figure 1. Schematic diagram R7 Q9 R19 R18 Q8 R6 D2 Q10 D1 Q18 R5 Q11 Q17 R17 Q7 Q2 Q19 OUT Q16 Q20 Q3 Q21 R10 D3 R15 R11 Q1 Q6 Q12 Q4 R20 Q5 R14 R12 R1 R2 R3 R4 R8 R9 R13 R21 Q13 Q14 Q15 Q22 R16 IN DS0428 - Rev 24 page 2/29