LM9070M National Semiconductor, LM9070M Datasheet

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LM9070M

Manufacturer Part Number
LM9070M
Description
Low-Dropout System Voltage Regulator with Keep-Alive ON/OFF Control
Manufacturer
National Semiconductor
Datasheet
© 1999 National Semiconductor Corporation
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 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).
Connection Diagrams and Ordering Information
Backside metal is internally connected to ground.
See NS Package Number TS7B
Order Number LM9070S
Surface Mount Package
7-Lead TO-263
DS012831
DS012831-1
Features
n Automotive application reliability
n 3% output voltage tolerance
n Insensitive to radiated RFI
n Dropout voltage less than 800 mV with 250 mA output
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, 50 µA maximum
n Wide operating temperature range −40˚C to +125˚C
n TO-263 and 20-pin power surface mount packages
n Lead form compatible with TLE4267 TO-220 regulator
current
(package TA07D)
See NS Package Number M20B
Order Number LM9070M
(Top View)
20-Pin SO Package
December 1999
www.national.com
DS012831-2

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LM9070M Summary of contents

Page 1

... Low OFF quiescent current, 50 µA maximum n Wide operating temperature range −40˚C to +125˚C n TO-263 and 20-pin power surface mount packages n Lead form compatible with TLE4267 TO-220 regulator (package TA07D) (Top View) 20-Pin SO Package Order Number LM9070M See NS Package Number M20B December 1999 DS012831-2 www.national.com ...

Page 2

Connection Diagrams and Ordering Information (Odd numbered pins bent forward away from package body) www.national.com (Top View) (Continued) 7-Lead TO-220 Package DS012831-3 Tab is internally connected to ground. Order Number LM9070T See NS Package Number TA07B 7-Lead TO-220 Package (Even ...

Page 3

Absolute Maximum Ratings Input Voltage ON/OFF, Keep-Alive Inputs (through Input Voltage < Positive Input Transient (t 100 ms) < Negative Input Transient (t 1 ms) Reset Output Sink Current Power Dissipation Junction Temperature ESD Susceptibility (Note ...

Page 4

Electrical Characteristics The following specifications apply for V CC < µFd. ESR Symbol Parameter CONTROL LOGIC V high High Input Threshold Voltage, KA Keep-Alive Input V low Low Input Voltage, ON/OFF Input ON/OFF V ...

Page 5

Typical Performance Characteristics Turn ON Characteristics DS012831-6 Output Voltage at Input Voltage Extremes DS012831-9 Dropout Voltage vs Temperature DS012831-12 = 25˚C unless indicated otherwise Turn OFF Characteristics DS012831-7 Quiescent Current vs Input Voltage DS012831-10 Reset Delay Time vs ...

Page 6

Typical Performance Characteristics Output Capacitor ESR DS012831-15 ON/OFF, Keep-Alive and Safety Latch-Off Control Diagrams Note: If Keep-Alive is provided by a microprocessor powered by the output voltage of the LM9070, the logic “1” voltage level will track V OFF. Simple ...

Page 7

Control Logic Truth Table ON/OFF Keep-Alive Output Input Input Voltage −300 mV OUT OUT Block Diagram Application Information The ...

Page 8

Application Information An output bypass capacitor of at least 10 µF is required for stability (47 µF is recommended). The ESR of this capacitor should be less than input capacitor of 1 µF or larger is recommended ...

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Application Information (Continued) 9 DS012831-25 www.national.com ...

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... Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead (0.300" Wide) Molded Small Outline Package, JEDEC www.national.com Order Number LM9070M NS Package Number M20B 10 ...

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Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 7-Lead Molded TO-220 Order Number LM9070T NS Package Number TA07B 11 www.national.com ...

Page 12

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) www.national.com 7-Lead Molded TO-220 Order Number LM9070T/Flow LB09 NS Package Number TA07D 7-Lead Molded TO-263 Order Number LM9070S NS Package Number TS7B 12 ...

Page 13

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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