LM9072
Dual Tracking Low-Dropout System Regulator
General Description
The LM9072 is a high performance voltage regulator system
with operational and protection features that address many
requirements of automotive applications. Two regulated out-
puts are provided. The main regulator provides a precision
2% maximum tolerance 5V output at 350 mA with a low drop-
out characteristic. The second regulator provides a 5V out-
put that tracks the main regulator output voltage within 1.5%
with load currents up to 80 mA. The tracking output is ideal
for use in powering remotely located sensors with outputs
that are ratiometric to the main system supply. This output is
fully protected from short circuits to ground or the unregu-
lated input supply (ignition or battery potentials in automotive
applications).
The LM9072 also contains a programmable delayed system
reset output. Two control inputs are provided. An ON/OFF in-
put intended for connection to an ignition switch, and a Keep
Alive input to allow a system to remain powered after ignition
has been switched OFF.
For EMC concerns the LM9072 remains fully operational
and does not generate false rest signals while subjected to,
1 MHz to 400 MHz bulk current injection signals greater than
100 mA on the input supply and tracking output lines.
Features
n
Two 5V regulated outputs:
-- 350 mA, 2% Main output
-- 80 mA, 1.5% Tracking output
n
Good EMI (1 MHz to 400 MHz, BCI) immunity
n
Separate ON/OFF and Keep-Alive control inputs
n
Less than 100 A quiescent current in OFF state
n
Programmable delayed reset output
n
Input transient protection over 60V to -45V
n
Tracking output protected from shorts to battery
n
Less than 1V dropout at full load
n
-40C to +125C operating temperature range
n
Surface mount TO-263 Power Package and Standard
TO-220 power package
Typical Applications
n
Automotive module supply power conditioning
n
Remote sensor biasing
n
Ratiometric to supply sensor detection
n
Continuous operation for save routines and EPROM
programming after power down command
n
Safety related systems -- EMC operational
Connection Diagrams and Ordering Information
9-Lead TO-263
Surface Mount Power Package
DS012906-2
Backside metal is internally connected to ground.
Order Number LM9072S
See NS Package Number TS9A
9-Lead TO-220 Package
DS012906-3
Tab is internally connected to ground.
Order Number LM9072T
See NS Package Number TA9A
December 1999
LM9072
Dual
T
racking
Low-Dropout
System
Regulator
1999 National Semiconductor Corporation
DS012906
www.national.com
Absolute Maximum Ratings
(Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage (Continuous)
-45V to 45V
Input Voltage (Transient, t
400 ms)
60V
Forced Output Voltages
Main Output
-0.3V to 7V
Tracking Output
-0.3V to 27V
ON/OFF Input Voltage (Note 6)
-0.3V to 16V
ON/OFF Input Current
20 mA
Keep Alive In, Reset Out,
C
DELAY
Voltage
-0.3V to 7V
Junction Temperature
150C
Storage Temperature Range
-65C to +150C
ESD Susceptibility (Note 2)
2000V
Lead Temperature
(Soldering, 10 seconds)
265C
Operating Ratings
(Note 1)
Input Voltage Range
6V to 27V
Ambient Temperature Range
-40C to +125C
Thermal Resistance,
J-C
4C/W
Thermal Resistance,
J-A
43C/W
Electrical Characteristics
6.0V
V
IN
19V, T
CASE
= 25C, unless otherwise specified. C
OUT
6 F with 0.3
ESR
3
on each regulator output.
Symbol
Parameter
Conditions
Min
Max
Units
MAIN REGULATOR
V
MAIN
Output Voltage
5 mA
I
LOAD
350 mA
-40C
T
CASE
125C
4.9
5.1
V
19V
V
IN
V
SD
,
5 mA
I
LOAD
350 mA
-40C
T
CASE
125C
4.8
5.2
V
R
MLOAD
Load Regulation
V
IN
= 16V, 5 mA
I
LOAD
350 mA
25
mV
R
MLINE
Line Regulation
I
LOAD
= 350 mA, 8V
V
IN
16V
25
mV
V
MDO
Dropout Voltage, V
IN
V
MAIN
V
IN
>
5.5V, 5 mA
I
LOAD
350 mA
(Note 5)
0.8
V
V
SD
Overvoltage Shutdown Threshold
30
36
V
I
MSC
Output Short Circuit Current
R
L
= 1
450
1000
mA
R
MRR
Ripple Rejection
V
IN
= 9V, 50
Freq
20 kHz,
V
RIPPLE
= 4V
P-P
40
dB
TRACKING REGULATOR
V
TRACK
Output Voltage
1 mA
I
LOAD
80 mA
-40C
T
CASE
125C
4.85
5.15
V
19V
V
IN
V
SD
1 mA
I
LOAD
80 mA
-40C
T
CASE
125C
4.725
5.275
V
V
ERROR
Output Tracking Error
(V
MAIN
V
TRACK
)
1 mA
I
LOAD
80 mA
-50
50
mV
V
TDO
Dropout Voltage,
V
IN
V
TRACK
V
IN
>
5.5V, 1 mA
I
LOAD
80 mA
(Note 5)
0.8
V
V
SD
Overvoltage Shutdown Threshold
30
36
V
I
TSC
Output Short Circuit Current
R
L
= 1
200
mA
V
TSC
Output Short Circuit Voltage
No Effect On Other Functions
-2
27
V
R
TRR
Ripple Rejection
V
IN
= 9V, 50
Freq
20 kHz,
V
RIPPLE
= 4V
P-P
40
dB
INPUT CURRENT
I
qOFF
Quiescent Input Current with
Both Regulators OFF
8V
V
IN
16V
40
A
16V
V
IN
42V
10
mA
I
q
No Load Quiescent Current
8V
V
IN
19V, I
L
= 0 mA
15
mA
In
ON
Additional Input Current with
Both Regulators ON
V
IN
>
8V, I
Ltotal
= I
Lmain
+ I
Ltrack
I
Ltotal
= 350 mA + 80 mA = 430 mA
1.2
x I
Ltotal
Iin
do
Additional Input Current in Dropout
0V
<
V
IN
<
8V, (Note 4)
I
Ltotal
= I
Lmain
+ I
Ltrack
I
Ltotal
= 350 mA + 80 mA = 430 mA
1.5
x I
Ltotal
LM9072
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2
Electrical Characteristics
(Continued)
6.0V
V
IN
19V, T
CASE
= 25C, unless otherwise specified. C
OUT
6 F with 0.3
ESR
3
on each regulator output.
Symbol
Parameter
Conditions
Min
Max
Units
RESET OUTPUT
V
THRL
Low Switching Threshold
V
MAIN
Output Controls Reset
4.45
4.75
V
V
THRH
High Switching Threshold
V
MAIN
Output Controls Reset
5.40
5.75
V
V
LOW
Logic Low Output Voltage
1V
V
MAIN
V
THRL
,
R
RESET
= 50 k
to V
MAIN
0.4
V
V
HIGH
Logic High Output Voltage
Normal Operation,
V
THRL
V
MAIN
V
THRH
, I
SOURCE
= 0
V
MAIN
50 mV
V
MAIN
V
R
P-U
Internal Output Pull-Up Resistance
2.4
6.0
k
T
DELAY
Reset Delay Interval
C
DELAY
= 0.1 F (Low Leakage),
I
DELAY
for Charging the Delay
Capacitor is Typically 6 A
35
70
ms
T
RISE
Output Rise Time
From 10% V
MAIN
to 90% V
MAIN
C
LRESET
= 50 pF
1.5
s
T
FALL
Output Fall Time
From 90% V
MAIN
to 10% V
MAIN
C
LRESET
= 50 pF
0.5
s
CONTROL INPUTS
V
ON
ON Threshold for ON/OFF Input
R
SERIES
= 22 k
3.5
4.5
V
V
OFF
OFF Threshold for ON/OFF Input
R
SERIES
= 22 k
(Note 3)
1.5
2.5
V
I
ON/OFF
ON/OFF Input Current
1.4V
V
ON/OFF
4.5V
1
12
A
-0.3V
V
ON/OFF
7V (Note 6)
-1
5
mA
ON
K-A
Turn ON Threshold for Keep Alive
Input
2
V
OFF
K-A
Turn OFF Threshold for Keep Alive
Input
(Note 3)
0.8
V
R
P-D
Pull-Down Resistance at Keep
Alive Input
0V
V
K-A
5V
5
40
k
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device re-
mains functional but do not guarantee specific performance limits. For guaranteed specifications and test conditions see the Electrical Characteristics.
Note 2: Human body model, 150 pF capacitor discharged through a 1.5 k
resistor.
Note 3: If either control input is left open circuited the regulators will turn OFF.
Note 4: The input quiescent current will increase when the regulators are in dropout conditions. The amount of additional input currents is a direct function of the total
load current on both outputs. The peak increase in current is limited to 50% of the total load current.
Note 5: The dropout voltage specifications actually indicate the saturation voltage of the PNP power transistors used in each regulator. Over the full load current and
temperature ranges both regulators will output at least 4.7V with an input voltage of only 5.5V.
Note 6: The ON/OFF input is internally clamped to a 7V zener diode through a 1 k
resistor.
LM9072
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3
Typical Performance Characteristics
(T
A
= 25C unless otherwise specified)
Turn-ON Characteristic
DS012906-4
Turn-OFF Characteristic
DS012906-5
Normalized Main Output
Voltage vs Temperature
DS012906-6
Quiescent Input Current vs
Input Voltage
DS012906-7
Main Output Voltage at
Input Voltage Extremes
DS012906-8
Input Current vs Input
Voltage (Regulators OFF)
DS012906-9
Tracking Output Short
Circuit Current
DS012906-10
Main Regulator Dropout
Voltage vs Load Current
DS012906-11
Output Short Circuit
Current vs Temperature
DS012906-12
LM9072
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4
Typical Performance Characteristics
(T
A
= 25C unless otherwise specified) (Continued)
Operational Characteristics
Control Logic Truth Table
ON/OFF
Input
Keep-Alive
Input
Main
Output
Voltage
Tracking
Output
Voltage
Reset
Output
Operating Condition
L
L
0V
0V
0V
OFF, Input Current
<
100 A
L
5V
5V
After Delay
Outputs Turn ON, Power ON Delayed Reset
H
X
5V
5V
5V
Normal ON Condition
H
X
<
4.45V
<
4.45V
0V
Main Output Pulled Out of Regulation, Reset Flag Generated
H
5V
5V
5V
Keep-Alive, Continued Normal Operation
L
5V
5V
After Delay
Outputs Turned ON by Keep-Alive Input
Reverse Battery
Input Current
DS012906-13
Maximum Power
Dissipation
DS012906-14
Output Capacitor ESR
DS012906-15
DS012906-16
LM9072
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5
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