National Semiconductor LM723, LM723C Technical data

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LM723/LM723C
Voltage Regulator

LM723/LM723C Voltage Regulator

June 1999

General Description

The LM723/LM723C is a voltage regulator designed prima­rily for series regulator applications. By itself, it will supply
output currentsup to 150 mA; but external transistors can be
added to provide any desired load current. The circuit fea­tures extremely low standby current drain, and provision is
made for either linear or foldback current limiting.

The LM723/LM723C is also useful in a wide range of other
applications suchas a shunt regulator, a current regulatoror
a temperature controller.

The LM723C is identical to the LM723 except that the
LM723C has its performance guaranteed over a 0˚C to
+70˚C temperature range, instead of −55˚C to +125˚C.

Connection Diagrams

Dual-In-Line Package

DS008563-2

Top View

Order Number LM723J/883 or LM723CN

See NS Package J14A or N14A

Features

n 150 mA output current without external pass transistor
n Output currents in excess of 10A possible by adding

external transistors

n Input voltage 40V max
n Output voltage adjustable from 2V to 37V
n Can be used as either a linear or a switching regulator

Metal Can Package

DS008563-3

Note: Pin 5 connected to case.

Top View

Order Number LM723H, LM723H/883 or LM723CH

See NS Package H10C

© 1999 National Semiconductor Corporation DS008563 www.national.com

Connection Diagrams (Continued)

Equivalent Circuit

*

DS008563-20

Top View

Order Number LM723E/883

See NS Package E20A

*Pin numbers refer to metal can package.

Typical Application

for minimum temperature drift.

Typical Performance

Regulated Output Voltage 5V
Line Regulation (∆V
Load Regulation (∆I

=

3V) 0.5mV

IN

=

50 mA) 1.5mV

L

FIGURE 1. Basic Low Voltage Regulator

(V

OUT

=

2 to 7 Volts)

DS008563-4

DS008563-8

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Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.

(Note 10)
Pulse Voltage from V

Continuous Voltage from V
Input-Output Voltage Differential 40V
Maximum Amplifier Input Voltage

(Either Input) 8.5V

Maximum Amplifier Input Voltage

(Differential) 5V
Current from V
Current from V
Internal Power Dissipation

Metal Can (Note 2) 800 mW

+

to V−(50 ms) 50V

+

−

to V

Z
REF

40V

25 mA
15 mA

Cavity DIP (Note 2) 900 mW
Molded DIP (Note 2) 660 mW

Operating Temperature Range

LM723 −55˚C to +150˚C
LM723C 0˚C to +70˚C

Storage Temperature Range

Metal Can −65˚C to +150˚C
Molded DIP −55˚C to +150˚C

Lead Temperature (Soldering, 4 sec. max.)

Hermetic Package 300˚C
Plastic Package 260˚C

ESD Tolerance 1200V

(Human body model, 1.5 kΩ in series with 100 pF)

Electrical Characteristics (Note 3) (Note 10)

Parameter Conditions LM723 LM723C Units

Min Typ Max Min Typ Max

Line Regulation V

IN

=

12V to V

−55˚C ≤ TA≤ +125˚C 0.3
0˚C ≤ TA≤ +70˚C 0.3

=

V

12V to V

IN

Load Regulation I

=

L

1mAtoI

−55˚C ≤ TA≤ +125˚C 0.6
0˚C ≤ TA≤ +70˚C 0.6

Ripple Rejection f=50 Hz to 10 kHz, C

=

f

50 Hz to 10 kHz, C
Average Temperature Coeffic- −55˚C ≤ T
ient of Output Voltage (Note 8) 0˚C ≤ T
Short Circuit Current Limit R

A

=

10Ω,V

SC

Reference Voltage 6.95 7.15 7.35 6.80 7.15 7.50 V
Output Noise Voltage BW=100 Hz to 10 kHz, C

BW=100 Hz to 10 kHz, C
Long Term Stability 0.05 0.05
Standby Current Drain I

=

0, V

L

Input Voltage Range 9.5 40 9.5 40 V
Output Voltage Range 2.0 37 2.0 37 V
Input-Output Voltage Differential 3.0 38 3.0 38 V

θ

JA

θ

JA

θ

JA

θ

JA

θ

JC

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.

Note 2: See derating curves for maximum power rating above 25˚C.
Note 3: Unless otherwise specified, T

seen by error amplifier≤10 kΩ connected asshownin
perature drifts must be taken into account separately for high dissipation conditions.

Note 4: L

is 40 turns of No. 20 enameled copper wire wound on Ferroxcube P36/22-3B7 pot core or equivalent with 0.009 in. air gap.

1

Note 5: Figures in parentheses may be used if R1/R2 divider is placed on opposite input of error amp.
Note 6: Replace R1/R2 in figures with divider shown in

+

Note 7: V
Note 8: For metal can applications where V

and VCCmust be connected to a +3V or greater supply.

Molded DIP 105 ˚C/W

Cavity DIP 150 ˚C/W

H10C Board Mount in Still Air 165 165 ˚C/W

H10C Board Mount in 400 LF/Min Air Flow 66 66 ˚C/W

=

A

=

25˚C, V

IN

is required, an external 6.2V zener diode should be connected in series with V

Z

=

15V 0.01 0.1 0.01 0.1

IN

=

40V 0.02 0.2 0.1 0.5

IN

=

50 mA 0.03 0.15 0.03 0.2

L

=

07474dB

REF

=

5µF 86 86 dB

≤ +125˚C 0.002 0.015

A

REF

≤ +70˚C 0.003 0.015

=

06565mA

OUT

=

0 86 86 µVrms

REF

=

5 µF 2.5 2.5 µVrms

REF

=

30V 1.7 3.5 1.7 4.0 mA

IN

22 22 ˚C/W

+

=

V

Figure 1

Figure 13

V

−

=

=

=

12V, V

C

. Line and loadregulationspecifications are given forthecondition of constant chiptemperature.Tem-

0, V

OUT

.

5V, I

=

L

1 mA, R

=

=

0, C

1

100 pF, C

SC

=

0 and divider impedance as

REF

.

OUT

%
%
%
%
%
%
%

%
%

%

/1000 hrs

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

/˚C
/˚C

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Electrical Characteristics (Note 3) (Note 10) (Continued)

Note 9: Guaranteed by correlation to other tests.
Note 10: A military RETS specification is available on request.At the time of printing, the LM723 RETS specification complied with the Min and Max limits in this

table. The LM723E, H, and J may also be procured as a Standard Military Drawing.

Typical Performance Characteristics

Load Regulation
Characteristics with
Current Limiting

Current Limiting
Characteristics

DS008563-22

DS008563-25

Load Regulation
Characteristics with
Current Limiting

Current Limiting
Characteristics vs
Junction Temperature

DS008563-23

DS008563-26

Load & Line Regulation vs
Input-Output Voltage
Differential

DS008563-24

Standby Current Drain vs
Input Voltage

DS008563-27

Line Transient Response

DS008563-28

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Load Transient Response

Output Impedence vs
Frequency

DS008563-29

DS008563-30

Maximum Power Ratings

Noise vs Filter Capacitor
(C

in Circuit of

REF

(Bandwidth 100 Hz to 10 kHz)

Figure 1

)

DS008563-31

LM723
Power Dissipation vs
Ambient Temperature

DS008563-32

LM723C
Power Dissipation vs
Ambient Temperature

DS008563-33

TABLE 1. Resistor Values (kΩ) for Standard Output Voltage

Positive Applicable Fixed Output Negative Fixed 5%Output

Output Figures Output Adjustable Output Applicable Output Adjustable

Voltage

±

5

±

%

10%(Note 6) Voltage Figures

±

%

5

±

%

10

(Note 5) R1 R2 R1 P1 R2 R1 R2 R1 P1 R2
+3.0 1, 5, 6, 9, 12 (4) 4.12 3.01 1.8 0.5 1.2 +100 7 3.57 102 2.2 10 91
+3.6 1, 5, 6, 9, 12 (4) 3.57 3.65 1.5 0.5 1.5 +250 7 3.57 255 2.2 10 240
+5.0 1, 5, 6, 9, 12 (4) 2.15 4.99 0.75 0.5 2.2 −6 (Note 7) 3, (10) 3.57 2.43 1.2 0.5 0.75
+6.0 1, 5, 6, 9, 12 (4) 1.15 6.04 0.5 0.5 2.7 −9 3, 10 3.48 5.36 1.2 0.5 2.0
+9.0 2, 4, (5, 6, 9, 12) 1.87 7.15 0.75 1.0 2.7 −12 3, 10 3.57 8.45 1.2 0.5 3.3

+12 2, 4, (5, 6, 9, 12) 4.87 7.15 2.0 1.0 3.0 −15 3, 10 3.65 11.5 1.2 0.5 4.3
+15 2, 4, (5, 6, 9, 12) 7.87 7.15 3.3 1.0 3.0 −28 3, 10 3.57 24.3 1.2 0.5 10
+28 2, 4, (5, 6, 9, 12) 21.0 7.15 5.6 1.0 2.0 −45 8 3.57 41.2 2.2 10 33
+45 7 3.57 48.7 2.2 10 39 −100 8 3.57 97.6 2.2 10 91
+75 7 3.57 78.7 2.2 10 68 −250 8 3.57 249 2.2 10 240

TABLE 2. Formulae for Intermediate Output Voltages

Outputs from +2 to +7 volts Outputs from +4 to +250 volts Current Limiting

(

Figures 1, 4, 5, 6, 9, 12

(

Figure 7

)

Outputs from +7 to +37 volts Outputs from −6 to −250 volts Foldback Current Limiting

(

Figures 2, 4, 5, 6, 9, 12

)(

Figures 3, 8, 10

)

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