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
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 A 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).
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
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, 50 A maximum
n
Wide operating temperature range -40C to +125C
n
TO-263 and 20-pin power surface mount packages
n
Lead form compatible with TLE4267 TO-220 regulator
(package TA07D)
Connection Diagrams and Ordering Information
(Top View)
7-Lead TO-263
Surface Mount Package
20-Pin SO Package
01283101
Backside metal is internally connected to ground.
Order Number LM9070S
See NS Package Number TS7B
01283102
Order Number LM9070M
See NS Package Number M20B
August 2002
LM9070
Low-Dropout
System
V
oltage
Regulator
with
Keep-Alive
ON/OFF
Control
2002 National Semiconductor Corporation
DS012831
www.national.com
Connection Diagrams and Ordering Information
(Top View) (Continued)
7-Lead TO-220 Package
(Odd numbered pins bent forward away from package
body)
7-Lead TO-220 Package
(Even numbered pins bent forward
away from package body)
01283103
Tab is internally connected to ground.
Order Number LM9070T
See NS Package Number TA07B
01283104
Tab is internally connected to ground.
Order Number LM9070T/Flow LB09
See NS Package Number TA07D
LM9070
www.national.com
2
Absolute Maximum Ratings
(Note 1)
Input Voltage, DC
-26V to +40V
ON/OFF, Keep-Alive Inputs
(through 1k
)
-26V to +26V
Positive Input Transient (t
<
100 ms)
60V
Negative Input Transient (t
<
1 ms)
-50V
Reset Output Sink Current
5 mA
Power Dissipation
Internally Limited
Junction Temperature
150C
ESD Susceptibility (Note 2)
12 kV, 2 kV
Lead Temperature
(Soldering, 10 seconds)
260C
Storage Temperature
-50C to +150C
Operating Ratings
(Note 1)
Input Voltage
6V to 26V
Ambient Temperature
-40C to +125C
TO-220 Thermal Resistance,
J-C
3C/W
TO-220 Thermal Resistance,
J-A
(Note 3)
73C/W
TO-263 Thermal Resistance,
J-C
3C/W
TO-263 Thermal Resistance,
J-A
(Note 4)
80C/W
SO20 Thermal Resistance,
J-PINS
25C/W
SO20 Thermal Resistance,
J-A
85C/W
Electrical Characteristics
(Note 5)
The following specifications apply for V
CC
= 6V to 26V, -40C
T
A
125C, unless otherwise specified. C
OUT
=47F with an
ESR
<
3
. C
IN
= 1F.
Symbol
Parameter
Conditions
Min
Max
Units
REGULATOR OUTPUT
V
OUT
Output Voltage
5 mA
I
OUT
250 mA
4.85
5.15
V
V
OUT
Line
Line Regulation
I
OUT
= 5 mA, 9V
V
IN
16.5V
I
OUT
= 5 mA, 6V
V
IN
26V
25
50
mV
mV
V
OUT
Load
Load Regulation
V
IN
= 14.4V, 5 mA
I
OUT
250 mA
50
mV
Iq
Quiescent Current
V
ON/OFF
V
IN
I
OUT
= 5 mA
I
OUT
= 250 mA, V
IN
8V
I
OUT
= 5 mA, V
IN
= 5V
I
OUT
= 250 mA, V
IN
= 6V
4
25
10
50
mA
mA
mA
mA
Ioff
OFF Quiescent Current
V
IN
16.5V, Regulator OFF
-40C
T
J
60C
60C
T
J
135C
20
60
A
A
Vdo
Dropout Voltage
I
OUT
= 5 mA
I
OUT
= 250 mA
300
800
mV
mV
Isc
Short Circuit Current
R
L
= 1
0.4
1.5
A
PSRR
Ripple Rejection
V
IN
= (14V
DC
) + 1V
RMS
@
120H
Z
)
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
OVthr
Overvoltage Shutdown Threshold
27
V
Vo Transient
V
OUT
during Transients
V
IN
Peak
60V,
R
L
= 100
, = 100 ms
7
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
C
DELAY
= 0.1F
7
31
ms
I
DELAY
Charging Current for C
DELAY
10
30
A
Rpu
Internal Pull-up Resistance
12
80
k
LM9070
www.national.com
3
Electrical Characteristics
(Note 5) (Continued)
The following specifications apply for V
CC
= 6V to 26V, -40C
T
A
125C, unless otherwise specified. C
OUT
=47F with an
ESR
<
3
. C
IN
= 1F.
Symbol
Parameter
Conditions
Min
Max
Units
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 = 1 k
-2
2
V
V
ON/OFF
high
High Input Voltage, ON/OFF Input
Rseries = 1 k
4
26
V
I
ON/OFF
Input Current, ON/OFF Input
V
ON/OFF
4V
330
A
4V
<
V
ON/OFF
<
7V
670
A
V
ON/OFF
7V
10
mA
Rpu
KA
Internal Pull-up Resistance,
Keep-Alive Input
0V
V
IN
26V
20
100
k
Rpd
ON/OFF
Internal Pull-down Resistance
ON/OFF Input
0V
V
ON/OFF
26V
50
210
k
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 k
resistor. In addition, input pins V
IN
and
the ON/OFF input will withstand ten pulses of
12 kV from a 150 pF capacitor discharged through a 560
resistor with each pin bypassed with a 22 nF, 100V
capacitor.
Note 3: Exceeding the Maximum Allowable power dissipation will cause excessive die temperature, and the device will go into thermal shutdown. The
J-A
value
for the TO-220 package (still air, no additional heat sink) is 73C/W. The effective
J-A
value of the TO-220 package can be reduced by using conventional heat sink
methods.
Note 4: Exceeding the Maximum Allowable power dissipation will cause excessive die temperature, and the device will go into thermal shutdown. The
J-A
value
for the TO-263 package (still air, no additional heat sink) is 80C/W. The effective
J-A
value of the TO-263 package can be reduced by increasing the printed circuit
board area that is connected (soldered) to the package tab. Using 1 ounce (1.4 mils thick) copper clad with no solder mask, an area of 0.5 square inches will reduce
J-A
to 50C/W, an area of 1.0 square inches will reduce
J-A
to 37C/W, ad an area of 1.6 square inches will reduce
J-A
to 32C/W. If the printed circuit board uses
a solder mask, the copper clad area should be increased by at least 50% to maintain a similar
J-A
rating.
Note 5: Datasheet min/max specifications are guaranteed by design, test, and/or statistical analysis.
Reset Operation and Protection Features
01283105
LM9070
www.national.com
4
Typical Performance Characteristics
(T
A
= 25C unless indicated otherwise)
Turn ON Characteristics
Turn OFF Characteristics
01283106
01283107
Normalized Output Voltage
vs Temperature
Output Voltage at
Input Voltage Extremes
01283108
01283109
Quiescent Current vs
Input Voltage
Input Current vs
Input Voltage
Regulator Switched OFF
01283110
01283111
LM9070
www.national.com
5
PDF 
ZIP