lm9070t National Semiconductor Corporation, lm9070t Datasheet

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lm9070t

Manufacturer Part Number
lm9070t
Description
Low-dropout System Voltage Regulator With Keep-alive On/off Control
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2005 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
voltage regulator. The regulator features an active low de-
layed reset output flag which can be used to reset a micro-
processor system 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 LM9070 contains a
variety of protection features such as reverse battery, over-
voltage shutdown, thermal shutdown, input transient protec-
tion 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 regu-
lator 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
Surface Mount Package
Order Number LM9070S
7-Lead TO-263
DS012831
01283101
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
www.national.com
March 2005
01283102

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lm9070t Summary of contents

Page 1

... TO-263 Surface Mount Package Backside metal is internally connected to ground. Order Number LM9070S See NS Package Number TS7B © 2005 National Semiconductor Corporation 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 ...

Page 2

... Tab is internally connected to ground. Order Number LM9070T See NS Package Number TA07B www.national.com (Top View) (Continued) 7-Lead TO-220 Package (Even numbered pins bent forward away from package body) 01283103 Tab is internally connected to ground. Order Number LM9070T/Flow LB09 See NS Package Number TA07D 2 01283104 ...

Page 3

Absolute Maximum Ratings Input Voltage, DC ON/OFF, Keep-Alive Inputs (through 1kΩ) < Positive Input Transient (t 100 ms) < Negative Input Transient (t 1 ms) Reset Output Sink Current Power Dissipation Junction Temperature ESD Susceptibility (Note 2) Lead Temperature (Soldering, ...

Page 4

Electrical Characteristics The following specifications apply for V < ESR 3Ω 1µF. IN Symbol Parameter CONTROL LOGIC V low Low Input Threshold Voltage, KA Keep-Alive Input V high High Input Threshold Voltage, KA Keep-Alive Input V low Low ...

Page 5

Typical Performance Characteristics (T = 25˚C unless indicated otherwise) A Turn ON Characteristics Normalized Output Voltage vs Temperature Quiescent Current vs Input Voltage Turn OFF Characteristics 01283106 01283108 Regulator Switched OFF 01283110 5 01283107 Output Voltage at Input Voltage Extremes ...

Page 6

Typical Performance Characteristics Dropout Voltage vs Temperature Short Circuit Current vs Temperature Maximum Power Dissipation (TO-220 Package) www.national.com (T = 25˚C unless indicated otherwise) (Continued) A 01283112 Output Capacitor ESR 01283114 Maximum Power Dissipation (TO-263 and SO-20 Packages) 01283116 6 ...

Page 7

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 ON/OFF control (Keep-Alive input must be high ...

Page 8

Control Logic Truth Table ON/OFF Keep-Alive Output Input Input Voltage ↑ ↓ ↓ ↑ ∆V ≥ −300 OUT OUT Block ...

Page 9

Application Information The LM9070 voltage regulator has been optimized for use in microprocessor based automotive systems. Several unique design features have been incorporated to address many FMEA (Failure Mode Effects Analysis) concerns for fail-safe system performance. FAULT TOLERANT FEATURES While ...

Page 10

Application Information series with the input. The drop in input current may create a positive input voltage transient which may take the PNP out of saturation. If the input voltage is held constant at the threshold where the PNP is ...

Page 11

Application Information (Continued) 11 01283125 www.national.com ...

Page 12

Application Information THERMAL MANAGEMENT The LM9070 is packaged in both a TO-263 surface mount power package and a narrow lead-pitch TO-220 package. To obtain operation over the highest possible load current and input voltage ranges, care must be taken to ...

Page 13

... Physical Dimensions inches (millimeters) unless otherwise noted 20-Lead (0.300" Wide) Molded Small Outline Package, JEDEC Order Number LM9070M NS Package Number M20B 7-Lead Molded TO-220 Order Number LM9070T NS Package Number TA07B 13 www.national.com ...

Page 14

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) 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 14 ...

Page 15

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information ...

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