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PDF LM9074M Data sheet ( Hoja de datos )
| Número de pieza | LM9074M | |
| Descripción | System Voltage Regulator with Keep-Alive ON/OFF | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LM9074M (archivo pdf) en la parte inferior de esta página. Total 9 Páginas | ||
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PRELIMINARY
January 2000
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
Order Number LM9074M
See NS Package Number M14A
DS101305-2
© 2000 National Semiconductor Corporation DS101305
www.national.com
1 page  
Control Logic Truth Table
ON/OFF
Input
L
↑
H
↓
↓
↑
H
L
Keep-Alive
Input
X
X
X
H
L
L
X
L
Output
Voltage
0V
5V
5V
0V
5V
5V
∆VOUT ≥ −300 mV
VOUT ≤ 4V
Block Diagram
Reset
Output
L
↑ after delay
H
L
H
H
L
L
Operating Condition
Low quiescent current standby (OFF) condition
Output turns ON
Normal ON condition
Output turns OFF
Output kept ON by Keep-Alive Input
Output remains ON (or turns ON)
Output pulled out of regulation, reset flag generated
Output latches OFF
Application Information
The LM9074 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 not specifically guaranteed due to production testing
limitations, the LM9074 has been tested and shown to con-
tinue to provide a regulated output and, not generate an er-
roneous system reset signal while subjected to high levels of
RF electric field energy (up to 300 V/m signal strength over
DS101305-22
a 2 MHz to 400 MHz frequency range). This is very important
in vehicle safety related applications where the system must
continue to operate normally. To maintain this immunity to
RFI the output bypass capacitor is important (47 µF is rec-
ommended).
This regulator is suitable for applications where continuous
connection to the battery is required (Refer to the Typical Ap-
plication Circuit ). ON/OFF control of the regulator and sys-
tem can be accomplished by switching the ON/OFF input to
the battery or ignition supply VIN supply through a SPST
switch. If this input becomes open circuited, an internal
pull-down resistor ensures that the regulator turns OFF.
When the regulator is switched OFF the current load on the
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LM9074M.PDF ] | |
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