NSC LM9074MX, LM9074M Datasheet
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 activelow delayed reset
output flag which can be used to reset a microprocessor 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 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 provided 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 regulator 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
LM9074 System Voltage Regulator with Keep-Alive ON/OFF Control
© 2000 National Semiconductor Corporation DS101305 www.national.com
Absolute Maximum Ratings (Note 1)
Input Voltage
ON/OFF, Keep-Alive Inputs
(through 1 kΩ)
DC Input Voltage −26V to +26V
Positive Input Transient (t
<
100 ms) 40V
Negative Input Transient (t
<
1 ms) −50V
Reset Output Sink Current 5 mA
Power Dissipation Internally Limited
Junction Temperature 150˚C
ESD Susceptibility (Note 2) 12 kV, 2 kV
Lead Temperature
(Soldering, 10 seconds) 260˚C
Storage Temperature −50˚C to +150˚C
Operating Ratings (Note 1)
Input Voltage 7.5V to 16.5V
Ambient Temperature −40˚C to +125˚C
θj-pins, M14A Package 30˚C/W
θja, M14A Package 137˚C/W
Electrical Characteristics
The following specifications apply for V
CC
=
7.5V to 16.5V, −40˚C ≤ T
A
≤ 125˚C, unless otherwise specified. C
OUT
=
0.1µF.
Symbol Parameter Conditions Min Max Units
REGULATOR OUTPUT
V
OUT
Output Voltage 20 mA ≤ I
OUT
≤ 180 mA 4.85 5.15 V
∆V
OUT
Line Line Regulation I
OUT
=
20 mA, 9V ≤ V
IN
≤ 16.5V
I
OUT
=
20 mA, 7.5V ≤ V
IN
≤ 16.5V
25
50
mV
mV
∆V
OUT
Load Load Regulation V
IN
=
14.4V, 20 mA ≤ I
OUT
≤ 180
mA
50 mV
Iq Quiescent Current 4V ≤ V
ON/OFF
≤ V
IN
20mA ≤ I
OUT
≤ 180mA
25 mA
Ioff OFF Quiescent Current V
IN
≤ 16.5V, Regulator OFF
−40˚C ≤ T
J
≤ 60˚C
60˚C ≤ T
J
≤ 135˚C
20
60
µA
µA
Vdo Dropout Voltage I
OUT
=
20 mA
I
OUT
=
180 mA
2.0
2.5
V
V
Isc Short Circuit Current R
L
=
1Ω 0.4 1.0 A
PSRR Ripple Rejection V
IN
=
(14V
DC
) + (1V
RMS
@
120Hz)
I
OUT
=
50 mA 60 dB
Voth
OFF
Safety V
OUT
Latch-OFF Threshold In Keep-Alive mode
V
ON/OFF
=
0V, V
KA
=
0V 4 4.5 V
Vo Transient V
OUT
during Transients VINPeak ≤ 40V,
R
L
=
100Ω, τ=100 ms
5.5 V
RESET OUTPUT
Vth Threshold Voltage ∆V
OUT
Required to Generate a
Reset Output
4.85V ≤ V
OUT
≤ 5.15V
−300 −500 mV
Vlow Reset Output Low Voltage Isink=1.6 mA, V
OUT
>
3.2V 0.4 V
1.4V ≤ V
OUT
≤ 3.2V 0.8 V
Vhigh Reset Output High Voltage 0.9 V
OUT
V
OUT
V
t
delay
Delay Time Cdelay=0.1 µFd 7 45 ms
I
delay
Charging Current for Cdelay −7 25 µA
Rpu Internal Pull-up Resistance 12 80 kΩ
CONTROL LOGIC
V
KA
low Low Input Threshold Voltage,
Keep-Alive Input
3.5V ≤ V
OUT
≤ 5.25V 0.3 V
OUT
0.5 V
OUT
V
V
KA
high High Input Threshold Voltage,
Keep-Alive Input
3.5V ≤ V
OUT
≤ 5.25V 0.6 V
OUT
0.8 V
OUT
V
V
ON/OFF
low Low Input Voltage, ON/OFF Input Rseries=1kΩ −2 2 V
V
ON/OFF
high High Input Voltage, ON/OFF Input Rseries=1kΩ 4VINV
LM9074
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Electrical Characteristics (Continued)
The following specifications apply for V
CC
=
7.5V to 16.5V, −40˚C ≤ T
A
≤ 125˚C, unless otherwise specified. C
OUT
=
0.1µF.
Symbol Parameter Conditions Min Max Units
CONTROL LOGIC
I
ON/OFF
Input Current, ON/OFF Input V
ON/OFF
≤ 4V 330 µA
4V
<
V
ON/OFF
<
7V 670 µA
V
ON/OFF
≥ 7V 10 mA
Rpu
KA
Internal Pull-up Resistance,
Keep-Alive Input
20 100 kΩ
Rpd
ON/OFF
Internal Pull-down Resistance
ON/OFF Input
50 210 kΩ
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and conditions, see the Electrical Characteristics.
Note 2: All pins will survive an ESD impulse of
±
2000V using the human body model of 100 pF discharged through a 1.5 kΩ resistor. In addition, input pins VINand
the ON/OFF input will withstand ten pulses of
±
12 kV from a 150 pF capacitor discharged through a 560Ω resistor with each pin bypassed with a 22 nF, 100V ca-
pacitor.
Reset Operation and Protection Features
Typical Performance Characteristics
(T
A
=
25˚C unless indicated otherwise)
DS101305-5
Turn ON Characteristics
DS101305-6
Turn OFF Characteristics
DS101305-7
LM9074
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