LM9072

LM9072 Dual Tracking Low-Dropout System Regulator December 1999 LM9072 Dual Tracking Low-Dropout System Regulator General Description The LM9072 is a high performance voltage regulator system with operational and protection features that address many requirements of automotive applications. Two regulated outputs are provided. The main regulator provides a precision 2% maximum tolerance 5V output at 350 mA with a low dropout characteristic. The second regulator provides a 5V output that tracks the main regulator output voltage within 1.5% with load currents up to 80 mA. The tracking output is ideal for use in powering remotely located sensors with outputs that are ratiometric to the main system supply. This output is fully protected from short circuits to ground or the unregulated input supply (ignition or battery potentials in automotive applications). The LM9072 also contains a programmable delayed system reset output. Two control inputs are provided. An ON/OFF input intended for connection to an ignition switch, and a Keep Alive input to allow a system to remain powered after ignition has been switched OFF. For EMC concerns the LM9072 remains fully operational and does not generate false rest signals while subjected to, 1 MHz to 400 MHz bulk current injection signals greater than 100 mA on the input supply and tracking output lines. Features n Two 5V regulated outputs: — 350 mA, 2% Main output — 80 mA, 1.5% Tracking output n Good EMI (1 MHz to 400 MHz, BCI) immunity n Se...