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LM9074 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM9074 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 9 page LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control General Description The LM9074 is a 5V, 3% accurate, 180 mA NPN voltage regulator. The regulator features an active low delayed reset output flag which can be used to reset a microprocessor sys- tem on turn-ON and in the event that the regulator output falls out of regulation for any reason. An external capacitor programs a delay time interval before the reset output can return high. Designed for automotive application the LM9074 contains a variety of protection features such as reverse battery, over-voltage shutdown, thermal shutdown, input transient protection and a wide operating temperature range. A unique two-input logic control scheme is used to enable or disable the regulator output. An ON/OFF input can be pro- vided by an ignition switch derived signal while a second, Keep-Alive input, is generated by a system controller. This allows for a system to remain ON after ignition has been switched OFF. The system controller can then execute a power-down routine and after which command the regulator OFF to a low quiescent current state (60 µA max). Design techniques have been employed to allow the regula- tor to remain operational and not generate false reset signals when subjected to high levels of RF energy (300V/m from 2 MHz to 400 MHz). Features n Automotive application reliability n 3% output voltage tolerance n Insensitive to radiated RFI n Dropout voltage less than 2.5V with 180 mA output current n Externally programmed reset delay interval n Keep-alive feature with 2 logic control inputs n 60V Load dump transient protection n Thermal shutdown n Short circuit protection and disable safety features n Reverse battery protection n Low OFF quiescent current, 60 µA maximum n Wide operating temperature range −40˚C to +125˚C Connection Diagrams and Ordering Information (Top View) 14-Pin SO Package DS101305-2 Order Number LM9074M See NS Package Number M14A PRELIMINARY January 2000 © 2000 National Semiconductor Corporation DS101305 www.national.com |
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