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LM9070T Datasheet

  • LM9070T

  • Low-Dropout System Voltage Regulator with Keep-Alive ON/OFF ...

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  • NSC

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LM9070 Low-Dropout System Voltage Regulator with Keep-Alive ON/OFF Control
December 1999
LM9070
Low-Dropout System Voltage Regulator with Keep-Alive
ON/OFF Control
General Description
The LM9070 is a 5V, 3% accurate, 250 mA low-dropout volt-
age regulator. The regulator features an active low delayed
reset output flag which can be used to reset a microproces-
sor system on turn-ON and in the event that the regulator
output falls out of regulation for any reason. An external ca-
pacitor programs a delay time interval before the reset out-
put can return high.
Designed for automotive application the LM9070 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 碌A(chǔ) 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
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Automotive application reliability
3% output voltage tolerance
Insensitive to radiated RFI
Dropout voltage less than 800 mV with 250 mA output
current
Externally programmed reset delay interval
Keep-alive feature with 2 logic control inputs
60V Load dump transient protection
Thermal shutdown
Short circuit protection and disable safety features
Reverse battery protection
Low OFF quiescent current, 50 碌A(chǔ) maximum
Wide operating temperature range 鈭?0藲C to +125藲C
TO-263 and 20-pin power surface mount packages
Lead form compatible with TLE4267 TO-220 regulator
(package TA07D)
Connection Diagrams and Ordering Information
7-Lead TO-263
Surface Mount Package
(Top View)
20-Pin SO Package
DS012831-1
Backside metal is internally connected to ground.
DS012831-2
Order Number LM9070S
See NS Package Number TS7B
Order Number LM9070M
See NS Package Number M20B
漏 1999 National Semiconductor Corporation
DS012831
www.national.com

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