NSC LM9071T, LM9071S, LM9071SX Datasheet

LM9071
Low-Dropout System Voltage Regulator with Delayed
Reset

General Description

The LM9071 is a 5V, 250 mAlow-dropout voltage regulator.
The regulator features an active low delayed reset output
flag which can be used to reset a microprocessor 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 LM9071 contains a
variety of protection features such as reverse battery,
over-voltage shutdown, thermal shutdown, input transient
protection and a wide operating temperature range.

Design techniques have been employed to allow the regula­tor to remain operational and not generatefalse resetsignals
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 Thermal shutdown
n Short circuit protection
n Reverse battery protection
n Wide operating temperature range −40˚C to +125˚C
n TO-220 and TO-263 power surface mount power

packages

n Pin for pin compatible with the LM2927, L4947 and

TLE4260

Typical Application and Connection Diagrams (Top View)

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5-Lead TO-220 Package

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Order Number LM9071T

See NS Package Number T05A

5-Lead TO-220 Package

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Order Number LM9071T/Flow LB03

See NS Package Number T05D

5-Lead TO-263 Surface Mount Package

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Tab and Backside metal on all packages internally connected to ground.

Order Number LM9071S

See NS Package Number TS5B

December 1999

LM9071 Low-Dropout System Voltage Regulator with Delayed Reset

© 1999 National Semiconductor Corporation DS012832 www.national.com

Absolute Maximum Ratings (Note 1)

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 150˚C
ESD Susceptibility (Note 2) 12 kV, 2 kV
Lead Temperature

(Soldering, 10 seconds) 260˚C

Storage Temperature −50˚C to +150˚C

Operating Ratings (Note 1)

Input Voltage 6V to 26V
Ambient Temperature −40˚C to +125˚C

θjc, TO-220, TO-263 Packages 3˚C/W
θja, TO-220, TO-263 Packages 43˚C/W

Electrical Characteristics

The following specifications apply for V

CC

=

6V to 26V, −40˚C ≤ T

A

≤+125˚C, unless otherwise specified. C

OUT

=

47 µFd with

an ESR

<

3Ω.C

IN

=

1 µFd.

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 25 mV

I

OUT

=

250 mA 50 mV

∆V

OUT

Load Load Regulation V

IN

=

14.4V, 5 mA ≤ I

OUT

≤ 250 mA 60 mV

Iq Quiescent Current I

OUT

=

5mA 4 mA

I

OUT

=

250 mA, V

IN

≥ 8V 25 mA

I

OUT

=

5 mA, V

IN

=

5V 10 mA

I

OUT

=

250 mA, V

IN

=

6V 50 mA

Vdo Dropout Voltage I

OUT

=

5 mA 300 mV

I

OUT

=

250 mA 800 mV

Isc Short Circuit Current R

L

=

1Ω 0.35 1.5 A

RR Ripple Rejection F

ripple

=

120 Hz, V

ripple

=

1 Vrms

I

OUT

=

50 mA

60 dB

OVthr Overvoltage Shutdown

Threshold

27 V

V

O

Transient V

OUT

during Transients VINPeak ≤ 60V, R

L

=

100Ω, τ=100 ms 7 V

RESET OUTPUT

Vth Threshold Voltage ∆V

OUT

Required to Generate a Reset

Output

4.8V ≤ V

OUT

≤ 5.2V

−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 0.8

V

OUT

V

t

delay

Delay Time Cdelay=100 mFd 7.6 35 ms
Idelay Charging Current for Cdelay 10 30 µA
Rpu Internal Pull-up Resistance 12 80 kΩ

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 kΩ resistor. In addition the input voltage

pin will withstand ten pulses of

±

12 kV from a 150 pF capacitor discharged through a 560Ω resistor when bypassed with a 22 nF, 100V capacitor.

LM9071

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Typical Performance Characteristics (T

A

=

25˚C unless indicated otherwise)

Turn ON Characteristics

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Turn OFF Characteristics

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Normalized Output Voltage
vs Temperature

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Output Voltage at
Input Voltage Extremes

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Quiescent Current vs
Input Voltage

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Short Circuit Current
vs Temperature

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Dropout Voltage vs
Temperature

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Reset Delay Time
vs Temperature

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Output Capacitor ESR

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LM9071

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