The L4948 is a quad output low drop voltage regulator with four outputs: 10V at 300mA, 8V at 400mA, 5V at 600mA, and 5V at 100mA.
It includes features such as low drop, thermal shutdown, current limitation, reverse battery and load dump protection, and early warning output for supply undervoltage.
The IC is designed for supplying microcomputer controlled systems, especially in automotive applications.
It also includes an inhibit and reset function, as well as a monitoring circuit to warn of low voltage or no voltage conditions.
The STCAP pin allows the battery voltage to decay slowly, giving the microprocessor time to store data.
The IC also has a st-by mode to keep the microprocessor and memories alive during ignition off conditions.
The ON/OFF input pin is controlled by the microprocessor to switch between normal mode and st-by mode.
The L4948 is designed to operate within specific electrical characteristics and has a timing diagram to illustrate its functionality.