NSC LM9073SX, LM9073S Datasheet

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 out­puts are provided. The main regulator provides a precision
2% tolerance 5V outputat700mAwith a low dropoutcharac­teristic. The second output, an External Supply regulator,
provides a 5V output with 2% tolerance for load currents up
to 100mA. ThisExternal Supply output is fully protected from
short circuit to ground or the unregulated input supply (igni­tion 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 areprovided. An ON/OFF in­put intended for connection to an ignition switch, and a Keep
Alive input whereby a system can remain powered after igni­tion has been switched OFF. Additionally, a watchdog func­tion 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 100µA 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 −40˚C to 125˚C 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 www.national.com

Block Diagram

DS101296-3

LM9073

www.national.com 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 150˚C
Storage Temperature −65˚C to 150˚C
ESD Susceptibility(Note 2) 2000V
Lead temperature (Soldering, 10 Sec) 265˚C

Operating Ratings(Note 1)

Input Voltage Range 6V to 27V
Ambient Temperature Range −40˚C to 125˚C

Thermal Resistance

θ

JC

4˚C/W

θ

JA

43˚C/W

Electrical Characteristics

The following specifications apply for 6V ≤ vIN≤ 19V, t

CASE

= 25˚C unless otherwise specified. C

OUT

≥ 6µF with 0.3Ω≤ESR

≤ 0.3Ω 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

≤ VSD,

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 ≤ VIN≤ 16V 25 mV

V

MDO

Dropout Voltage, VIN−V

MAIN

V

IN

>

5.5V, 10mA ≤ I

LOAD

≤

700mA(Note 5)

1V

V

SD

Overvoltage Shutdown
Threshold

30 36 V

I

MSC

Output Short Circuit Current RL=1Ω 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 ≤ VIN≤ 16V 25 mV

V

EDO

Dropout voltage, VIN−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 RL=1Ω 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 µA

16V ≤ V

IN

≤ 42V 10 mA

I

Q

No Load Quiescent Current 8V ≤ VIN≤ 19V, IL= 0mA 15 mA

LM9073

www.national.com3

Electrical Characteristics (Continued)

The following specifications apply for 6V ≤ vIN≤ 19V, t

CASE

= 25˚C unless otherwise specified. C

OUT

≥ 6µF with 0.3Ω≤ESR

≤ 0.3Ω 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=IMAIN

+

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=IMAIN+ILEXT

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

= 50kΩ 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 kΩ

T

DELAY

Reset Delay Interval C

DELAY

= 0.1µF 35 70 mS

T

RISE

Output Rise Time

From 10% V

MAIN

to 90% V

MAIN

C

LRESET

= 50pF

1.5 µS

T

FALL

Output Fall Time

From 90% V

MAIN

to 10% V

MAIN

C

LRESET

= 50pF

0.5 µS

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

= 0.1µF (low
leakage)
I

WATCHDOG

for charging the

watchdog

35 70 mS

T

PW

Watchdog Trigger Pulse Width 10 µS

R

TRIG

Trigger Input Pull-down
Resistance

540kΩ

Control Inputs

V

ON

ON Threshold for ON/OFF Input Rseries = 22kΩ 3.5 4.5 V

V

OFF

OFF Threshold for ON/OFF
Inpu

Rseries = 22kΩ (Note 3) 1.5 2.5 V

I

ON/OFF

ON/OFF Input Current 1.4V ≤ V

ON/OFF

≤ 4.5V 1 12 µA

−0.3V ≤ V

ON/OFF

≤ 7V(Note 6) −1 5 mA

ON

K−A

Turn ON Threshold for Keep
Alive Input

2V

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 kΩ

LM9073

www.national.com 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 donot guaranteespecific performance limits.

“Electrical Characteristics”

state DC andAC electrical specificationsunder particulartest conditions which
guarantee specificperformance limits. This assumes that the device is within theOperating 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 kΩ 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 dropoutvoltage specifications actually indicate the saturation voltage of the PNP power transistors used in eachregulator. 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 1KΩ 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

www.national.com5

Electrical Characteristics (Continued)

Output Voltages at Input Voltage Extremes

DS101296-8

Main Output Dropout Voltage vs Load Current

DS101296-9

External Supply Output Short Circuit Current

DS101296-10

Output Short Circuit Current vs Temperature

DS101296-11

Watchdog and Reset Delay Time vs Temperature

DS101296-12

Maximum Power Dissipation

DS101296-13

LM9073

www.national.com 6