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 A 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 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
DS012831-1
Backside metal is internally connected to ground.
Order Number LM9070S
See NS Package Number TS7B
20-Pin SO Package
DS012831-2
Order Number LM9070M
See NS Package Number M20B
December 1999
LM9070
Low-Dropout
System
V
oltage
Regulator
with
Keep-Alive
ON/OFF
Control
1999 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)
DS012831-3
Tab is internally connected to ground.
Order Number LM9070T
See NS Package Number TA07B
7-Lead TO-220 Package
(Even numbered pins bent forward
away from package body)
DS012831-4
Tab is internally connected to ground.
Order Number LM9070T/Flow LB09
See NS Package Number TA07D
LM9070
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2
Absolute Maximum Ratings
(Note 1)
Input Voltage
ON/OFF, Keep-Alive Inputs
(through 1 k
)
DC Input Voltage
-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
jc, TO-220, TO-263 Packages
3C/W
ja, TO-220, TO-263 Packages
43C/W
j-pins, SO20 Package
25C/W
ja, SO20 Package
85C/W
Electrical Characteristics
The following specifications apply for V
CC
= 6V to 26V, -40C
T
A
125C, unless otherwise specified. C
OUT
=47 Fd with an
ESR
<
3
. C
IN
= 1 Fd.
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
RR
Ripple Rejection
fripple = 120 Hz, Vripple = 1 Vrms
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
Cdelay = 0.1 Fd
7
31
ms
I
delay
Charging Current for Cdelay
10
30
A
Rpu
Internal Pull-up Resistance
12
80
k
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
LM9070
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3
Electrical Characteristics
(Continued)
The following specifications apply for V
CC
= 6V to 26V, -40C
T
A
125C, unless otherwise specified. C
OUT
=47 Fd with an
ESR
<
3
. C
IN
= 1 Fd.
Symbol
Parameter
Conditions
Min
Max
Units
CONTROL LOGIC
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 ca-
pacitor.
Reset Operation and Protection Features
DS012831-5
LM9070
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4
Typical Performance Characteristics
(T
A
= 25C unless indicated otherwise)
Turn ON Characteristics
DS012831-6
Turn OFF Characteristics
DS012831-7
Normalized Output Voltage
vs Temperature
DS012831-8
Output Voltage at
Input Voltage Extremes
DS012831-9
Quiescent Current vs
Input Voltage
DS012831-10
Input Current vs
Input Voltage
Regulator Switched OFF
DS012831-11
Dropout Voltage vs
Temperature
DS012831-12
Reset Delay Time
vs Temperature
DS012831-13
Short Circuit Current
vs Temperature
DS012831-14
LM9070
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