LM9073
Dual High Current Low-Dropout System Regulator
General Description
The LM9073 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% tolerance 5V output at 700mA with a low dropout charac-
teristic. The second output, an External Supply regulator,
provides a 5V output with 2% tolerance for load currents up
to 100mA. This External Supply output is fully protected from
short circuit to ground or the unregulated input supply (igni-
tion or battery potentials in automotive applications) which
makes it suitable for powering remotely located load circuits
or sub-systems.
The LM9073 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 whereby a system can remain powered after igni-
tion has been switched OFF. Additionally, a watchdog func-
tion is built in to enhance system operationally reliability.
For EMC concerns the LM9073 remains fully operational
and does not generate false rest signals while subjected to
greater than 100mA, 1MHz to 400MHz bulk current injection
signals on the input supply and External Supply output lines.
Features
n
Two 5V regulated outputs:
n
700mA, 2% Main output
n
100mA, 2% External Supply output
n
External Supply output protected from shorts to battery
n
Good EMI (1MHz to 400MHz, BCI) immunity
n
Separate ON/OFF and Keep-Alive control inputs
n
Less than 100A quiescent current in OFF state
n
Programmable delayed reset output
n
Adjustable threshold voltage for generating reset
n
Built-in system watchdog timer
n
Input transient protection over 60V to -45V
n
Less than 1V dropout at full load
n
Wide -40C to 125C operating temperature range
n
Surface mount, TO-263 and standard TO-220 power
packages
Applications
n
Automotive module supply power conditioning
n
Remote sub-system powering
n
Continuous operation for save routines and E
2
PROM
programing after power down command
n
Safety relates systems - EMC operational with a system
watchdog monitor
Connection Diagram
11 Lead TO-263 Package
DS101296-1
Top View
Order Number LM9073S
See NS Package Number TS11B
11 Lead TO-220 Package
DS101296-2
Top View
Order Number LM9073T
See NS Package Number TA11B
PRELIMINARY
April 2000
LM9073
Dual
High
Current
Low-Dropout
System
Regulator
2000 National Semiconductor Corporation
DS101296
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Block Diagram
DS101296-3
LM9073
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2
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
-45V to 45V
Input Voltage (transient, t
400mS)
60V
Forced Output Voltages
Main Output
-0.3V to 7V
External Supply Output
-0.3V to 27V
ON/OFF Input Voltage(Note 6)
-0.3V to 16V
ON/OFF Input Current
20mA
Keep Alive In, Reset Out, C
DELAY
,
Reset Adjust,Watchdog Trigger
In, C Watchdog
-0.3V to 7V
Junction Temperature
150C
Storage Temperature
-65C to 150C
ESD Susceptibility(Note 2)
2000V
Lead temperature (Soldering, 10 Sec)
265C
Operating Ratings
(Note 1)
Input Voltage Range
6V to 27V
Ambient Temperature Range
-40C to 125C
Thermal Resistance
JC
4C/W
JA
43C/W
Electrical Characteristics
The following specifications apply for 6V
v
IN
19V, t
CASE
= 25C unless otherwise specified. C
OUT
6F with 0.3
ESR
0.3
on each regulator output.
Symbol
Parameter
Conditions
LM9073
Units
Min
Max
MAIN REGULATOR
V
MAIN
Output Voltage
10mA
I
LOAD
700mA
4.9
5.1
V
19V
V
IN
V
SD
,
5mA
I
LOAD
700mA
4.8
5.2
V
R
MLOAD
Load Regulation
V
IN
= 16V, 10mA
I
LOAD
700mA
25
mV
R
MLINE
Line Regulation
I
LOAD
= 700mA, 8V
V
IN
16V
25
mV
V
MDO
Dropout Voltage, V
IN
- V
MAIN
V
IN
>
5.5V, 10mA
I
LOAD
700mA(Note 5)
1
V
V
SD
Overvoltage Shutdown
Threshold
30
36
V
I
MSC
Output Short Circuit Current
R
L
= 1
2000
mA
PSRR
Ripple Rejection
V
IN
= 9V, 50Hz
freq
20kHZ,
V
RIPPLE
= 4V
P-P
40
dB
External Supply Regulator
V
EXT
Output Voltage
3mA
I
LOAD
100mA
4.9
5.1
V
19V
V
IN
V
SD
3mA
I
LOAD
100mA
4.8
5.2
V
R
ELOAD
Load Regulation
V
IN
= 16V, 3mA
I
LOAD
100mA
25
mV
R
ELINE
Line Regulation
I
LOAD
= 100mA, 8V
V
IN
16V
25
mV
V
EDO
Dropout voltage, V
IN
- V
EXT
V
IN
>
5.5V, 3mA
I
LOAD
100mA (Note 5)
0.8
V
V
SD
Overvoltage Shutdown
Threshold
30
36
V
I
ESC
Output Short Circuit Current
R
L
= 1
250
mA
V
ESC
Output Short Circuit
No effect on other functions
-0.3
27
V
PSRR
Ripple Rejection
V
IN
= 9V, 50Hz
freq
20kHZ,
V
RIPPLE
= 4V
PP
40
dB
Input Current
I
QOFF
Quiescent Input Current with
Both Regulators OFF.
8V
V
IN
16V
100
A
16V
V
IN
42V
10
mA
I
Q
No Load Quiescent Current
8V
V
IN
19V, I
L
= 0mA
15
mA
LM9073
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3
Electrical Characteristics
(Continued)
The following specifications apply for 6V
v
IN
19V, t
CASE
= 25C unless otherwise specified. C
OUT
6F with 0.3
ESR
0.3
on each regulator output.
Symbol
Parameter
Conditions
LM9073
Units
Min
Max
Input Current
IN
ON
Additional Input Current with
both Regulators ON
V
IN
8V, I
LTOTAL
= I
MAIN
+
I
LEXT
I
LTOTAL
= 700mA + 100mA =
800mA
1.2
X
I
LTOTAL
LIN
DO
Additional Input Current when in
Dropout
0V
<
V
IN
<
8V, (Note 4)
I
LTOTAL
= I
MAIN
+ I
LEXT
I
LTOTAL
= 700mA + 100mA =
800mA
1.5
X
I
LTOTAL
Reset Output
V
THRL
Low Switching Threshold
V
MAIN
output controls Reset
Reset Adjust (pin 11 )open
circuited
4.0
4.2
V
Reset Adjust (pin 11) shorted to
ground
4.5
4.7
V
V
THRH
High Switching Threshold
V
MAIN
output controls Reset
5.35
5.75
V
V
LOW
Logic Low Output Threshold
1V
V
MAIN
V
THRL
R
RESET
= 50k
to V
MAIN
0.4
V
V
HIGH
Logic High Output Threshold
Normal opeation,
V
THRL
V
MAIN
THRH
,, I
SOURCE
= 0
V
MAIN
-50mV
V
MAIN
V
R
P-U
Internal Pull-Up Resistance
2.4
6.0
k
T
DELAY
Reset Delay Interval
C
DELAY
= 0.1F
35
70
mS
T
RISE
Output Rise Time
From 10% V
MAIN
to 90% V
MAIN
C
LRESET
= 50pF
1.5
S
T
FALL
Output Fall Time
From 90% V
MAIN
to 10% V
MAIN
C
LRESET
= 50pF
0.5
S
Watchdog
V
TRIGL
Trigger Input Logic Low Voltage
.08
V
V
TRIGR
Trigger Input Logic High Level
2
V
T
WD
Watchdog Refresh Window
C
WATCHDOG
= 0.1F (low
leakage)
I
WATCHDOG
for charging the
watchdog
35
70
mS
T
PW
Watchdog Trigger Pulse Width
10
S
R
TRIG
Trigger Input Pull-down
Resistance
5
40
k
Control Inputs
V
ON
ON Threshold for ON/OFF Input
Rseries = 22k
3.5
4.5
V
V
OFF
OFF Threshold for ON/OFF
Inpu
Rseries = 22k
(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
LM9073
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4
Electrical Characteristics
(Continued)
Note 1:
"Absolute Maximum Ratings"
indicate limits beyond which damage to the device may occur.
"Operating Ratings"
indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
"Electrical Characteristics"
state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 2: Human body model, 150 pFcapacitor 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 current is a direct function of the to
a 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 the Main regulator will output at least 4.5V and the External Supply regulator at lease 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 1K
resistor.
Quiescent Input Current vs. Input Voltage
DS101296-4
Turn-On Characteristic
DS101296-5
Turn-Off Characteristic
DS101296-6
Normalized Output Voltages vs Temperature
DS101296-7
LM9073
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