L4949ED STMicroelectronics

L4949E Multifunction very low drop voltage regulator Features Operating DC supply voltage range 5 V - 28 V Transient supply voltage up to 40V Extremely low quiescent current in standby mode SO-8 SO-20W (12+4+4) High precision standby output voltage 5V1% Output current capability up to 100mA Very low dropout voltage less than 0.5V Reset circuit sensing the output voltage Programmable reset pulse delay with external capacitor Voltage sense comparator Thermal shutdown and short circuit protections Description The L4949E is a monolithic integrated 5V voltage regulator with a very low dropout output and additional functions as power-on reset and input voltage sense. It is designed for supplying the microcomputer controlled systems especially in automotive applications. Table 1. Device summary Order codes Package Tube Tape and reel SO-8 L4949ED L4949ED013TR SO-20W L4949EP L4949EP013TR November 2009 Doc ID 4275 Rev 6 1/19 www.st.com 1 Obsolete Product(s) - Obsolete Product(s)Contents L4949E Contents 1 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1 Supply voltage transient . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3 Voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 3.4 Preregulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 3.5 Reset circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3.6 Sense comparator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4 Package and packing information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.1 ECOPACK packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 SO-8 TP package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.3 SO-20 TP package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 5 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 2/19 Doc ID 4275 Rev 6 Obsolete Product(s) - Obsolete Product(s)