LM723JAN
Voltage Regulator
General Description
The LM723 is a voltage regulator designed primarily for
series regulator applications. By itself, it will supply output
currents up 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 is also useful in a wide range of other applica-
tions such as a shunt regulator, a current regulator or a
temperature controller.
Features
n150 mA output current without external pass transistor
nOutput currents in excess of 10A possible by adding
external transistors
nInput voltage 40V max
nOutput voltage adjustable from 2V to 37V
nCan be used as either a linear or a switching regulator
Ordering Information
NS PART NUMBER SMD PART NUMBER NS PACKAGE NUMBER PACKAGE DISCRIPTION
JL723BIA JM38510/10201BIA H10C 10LD Metal Can
JL723SCA JM38510/10201SCA J14A 14LD CERDIP
JL723SIA JM38510/10201SIA H10C 10LD Metal Can
Connection Diagrams
Dual-In-Line Package Metal Can Package
20125802
Top View
See NS Package J14A
20125803
Note: Pin 5 connected to case.
Top View
See NS Package H10C
February 2005
LM723JAN Regulator
© 2005 National Semiconductor Corporation DS201258 www.national.com
Equivalent Circuit*
20125804
*Pin numbers refer to metal can package.
Schematic Diagram
20125801
LM723JAN
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Absolute Maximum Ratings (Note 1)
Pulse Voltage from V
+
to V
−
(50 ms) 50V
Continuous Voltage from V
+
to V
−
40V
Input-Output Voltage Differential 40V
Differential Input Voltage ±5V
Voltage between non-inverting input and V
-
+8V
Current from V
Z
25 mA
Current from V
REF
15 mA
Internal Power Dissipation (T
A
= 125˚C)
Metal Can (Note 2) 300 mW
Cavity DIP (Note 2) 400 mW
Maximum T
J
+175˚C
Storage Temperature Range −65˚C ≤T
A
≤+150˚C
Lead Temperature
(Soldering, 4 sec. max.)
300˚C
Thermal Resistance
θ
JA
Cerdip (Still Air)
Cerdip (500LF/ Min Air flow)
Metal Can (Still Air)
Metal Can (500LF/ Min Air flow)
100˚C/W
61˚C/W
156˚C/W
89˚C/W
θ
JC
CERDIP
Metal Can
22˚C/W
37˚C/W
ESD Tolerance (Note 3) 1200V
Recommended Operating Conditions
Input Voltage Range 9.5V to 40V
DC
Output Voltage Range 2V to 37V
DC
Input-Output Voltage Differential 2.5 V to 38V
DC
Ambient Operating Temperature Range −55˚C ≤T
A
≤+125˚C
Quality Conformance Inspection
MIL-STD-883, Method 5004 and Method 5005
Subgroup Description Temp ( ˚C)
1 Static tests at +25
2 Static tests at +125
3 Static tests at -55
4 Dynamic tests at +25
5 Dynamic tests at +125
6 Dynamic tests at -55
7 Functional tests at +25
8A Functional tests at +125
8B Functional tests at -55
9 Switching tests at +25
10 Switching tests at +125
11 Switching tests at -55
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Electrical Characteristics
DC Parameters (Note 9)
Symbol Parameter Conditions Notes Min Max Units Sub-
groups
V
Rline
Line Regulation 12V ≤V
IN
≤15V, V
OUT
= 5V,
I
L
= 1mA
−0.1 0.1 %V
OUT
1
−0.2 0.2 %V
OUT
2
−0.3 0.3 %V
OUT
3
12V ≤V
IN
≤40V, V
OUT
= 2V,
I
L
= 1mA
−0.2 0.2 %V
OUT
1
9.5V ≤V
IN
≤40V, V
OUT
= 5V,
I
L
= 1mA
−0.3 0.3 %V
OUT
1
12V ≤V
IN
≤15V, V
OUT
= 5V,
I
L
= 1mA
−10.0 +10.0 mV 1
−20.0 +20.0 mV 2
−30.0 +30.0 mV 3
V
Rload
Load Regulation 1mA ≤I
L
≤50mA, V
IN
= 12V,
V
OUT
=5V
−0.15 0.15 %V
OUT
1
−0.4 0.4 %V
OUT
2
−0.6 0.6 %V
OUT
3
1mA ≤I
L
≤10mA, V
IN
= 40V,
V
OUT
= 37V
−0.5 0.5 %V
OUT
1
6mA ≤I
L
≤12mA, V
IN
= 10V,
V
OUT
= 7.5V
−0.2 0.2 %V
OUT
1
1mA ≤I
L
≤50mA, V
IN
= 12V,
V
OUT
=5V
−15.0 +15.0 mV 1
−40.0 +40.0 mV 2
−60.0 +60.0 mV 3
V
REF
Voltage Reference I
REF
= 1mA, V
IN
= 12V 6.95 7.35 V 1
6.9 7.4 V 2, 3
I
SCD
Standby Current V
IN
= 30V, I
L
=I
REF
=0,
V
OUT
=V
REF
0.5 3 mA 1
0.5 2.4 mA 2
0.5 3.5 mA 3
I
OS
Short Circuit Current V
OUT
= 5V, V
IN
=12V,
R
SC
=10Ω,R
L
=0
45 85 mA 1
V
Z
Zener Voltage I
Z
= 1mA (Notes 8,
10)
5.58 6.82 V 1
V
OUT
Output Voltage V
IN
= 12V, V
OUT
= 5V, I
L
= 1mA (Note 11) 4.5 5.5 V 1, 2, 3
Delta V
OUT
/ Delta T
Average Temperature
Coefficient of Output Voltage
25˚C ≤T
A
≤+125˚C, V
IN
= 12V,
V
OUT
= 5V, I
L
= 1mA
(Note 12) −0.01 0.01 %/˚C 8A
−55˚C ≤T
A
≤+25˚C, V
IN
= 12V,
V
OUT
= 5V, I
L
= 1mA
(Note 12) −0.015 0.015 %/˚C 8B
Delta V
OUT
/ Delta V
IN
Ripple Rejection f = 10KHz, C
REF
= 0F,
V
INS
=2V
RMS
64 dB 4
f = 10KHz, C
REF
= 5µF,
V
INS
=2V
RMS
76 dB 4
N
O
Output Noise Voltage 100Hz ≤f≤10KHz,
V
INS
=0V
RMS
,C
REF
= 0µF
120 µV
RMS
4
100Hz ≤f≤10KHz,
V
INS
=0V
RMS
,C
REF
= 5µF
7µV
RMS
4
Delta V
OUT
/ Delta V
IN
Line Transient Response V
IN
= 12V, V
OUT
= 5V,
I
L
= 1mA, C
REF
= 5µF,
R
SC
=0Ω,
Delta V
IN
= 3V for 25µsec
0 10 mV/V 4
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Electrical Characteristics (Continued)
DC Parameters (Note 9)
Symbol Parameter Conditions Notes Min Max Units Sub-
groups
Delta V
OUT
/ Delta I
L
Load Transient Response V
IN
= 12V, V
OUT
= 5V,
I
L
= 40mA, C
REF
= 5µF,
R
SC
=0Ω,
Delta I
L
= 10mA for 25µsec
−1.5 0 mV/mA 4
DC Parameters: Drift Values
Delta calculations performed on JAN S and QMLV devices at Group B, Subgroup 5, only.
Symbol Parameters Conditions Notes Min Max Unit Sub-
groups
V
Rline
Line Regulation 12V ≤V
IN
≤15V, V
OUT
= 5V,
I
L
= 1mA, ±1mV, or ±15%
(whichever is greater)
−1.0 1.0 mV 1
V
Rload
Load Regulation 1mA ≤I
L
≤50mA, V
IN
= 12V,
V
OUT
= 5V, ±1mV, or ±20%
(whichever is greater)
−1.0 1.0 mV 1
V
REF
Reference Voltage I
REF
= 1mA, V
IN
= 12V −15 15 mV 1
I
SCD
Standby Current Drain V
IN
= 30V, I
L
=I
REF
=0,
V
OUT
=V
REF
−10 10 % 1
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. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: The maximum power dissipation for these devices must be derated at elevated temperatures and is dictated by TJMAX,θJA, and the ambient temperature,
TA. The maximum available power dissipation at any temperature is Pd=(T
JMAX −T
A)/θJA or the number given in the Absolute Maximum Ratings, whichever is less.
See derating curves for maximum power rating above 25˚C.
Note 3: Human body model, 1.5 kΩin series with 100 pF.
Note 4: L1is 40 turns of No. 20 enameled copper wire wound on Ferroxcube P36/22-3B7 pot core or equivalent with 0.009 in. air gap.
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 Figure 13.
Note 7: V+and VCC must be connected to a +3V or greater supply.
Note 8: For metal can applications where VZis required, an external 6.2V zener diode should be connected in series with VOUT.
Note 9: Unless otherwise specified, TA= 25˚C, VIN =V
+=V
C= 12V, V−=0,V
OUT =5V,I
L= 1 mA, RSC =0,C
1= 100 pF, CREF = 0 and divider impedance as seen
by error amplifier ≤10 kΩconnected as shown in Figure 1. Line and load regulation specifications are given for the condition of constant chip temperature.
Temperature drifts must be taken into account separately for high dissipation conditions.
Note 10: Tested for 14 – lead DIP only.
Note 11: Setup test for Temp. Coeff.
Note 12: Calculated parameter
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Typical Performance Characteristics
Load Regulation
Characteristics with
Current Limiting
Load Regulation
Characteristics with
Current Limiting
20125822 20125823
Load & Line Regulation vs
Input-Output Voltage
Differential
Current Limiting
Characteristics
20125824 20125825
Current Limiting
Characteristics vs
Junction Temperature
Standby Current Drain vs
Input Voltage
20125826 20125827
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Typical Performance Characteristics (Continued)
Line Transient Response Load Transient Response
20125828 20125829
Output Impedence vs
Frequency
20125830
Maximum Power Ratings
Noise vs Filter Capacitor
(C
REF
in Circuit of Figure 1)
(Bandwidth 100 Hz to 10 kHz)
LM723
Power Dissipation vs
Ambient Temperature
20125831 20125832
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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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Typical Applications
20125808
for minimum temperature drift
Typical Performance
Regulated Output Voltage 5V
Line Regulation (∆V
IN
= 3V) 0.5mV
Load Regulation (∆I
L
= 50 mA) 1.5mV
FIGURE 1. Basic Low Voltage Regulator
(V
OUT
= 2 to 7 Volts)
20125809
for minimum temperature drift.
R3 may be eliminated for minimum component count.
Typical Performance
Regulated Output Voltage 15V
Line Regulation (∆V
IN
= 3V) 1.5 mV
Load Regulation (∆I
L
= 50 mA) 4.5 mV
FIGURE 2. Basic High Voltage Regulator
(V
OUT
= 7 to 37 Volts)
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Typical Applications (Continued)
20125810
Typical Performance
Regulated Output Voltage −15V
Line Regulation (∆V
IN
= 3V) 1 mV
Load Regulation (∆I
L
= 100 mA) 2 mV
FIGURE 3. Negative Voltage Regulator
20125811
Typical Performance
Regulated Output Voltage +15V
Line Regulation (∆V
IN
= 3V) 1.5 mV
Load Regulation (∆I
L
= 1A) 15 mV
FIGURE 4. Positive Voltage Regulator
(External NPN Pass Transistor)
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Typical Applications (Continued)
20125812
Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆V
IN
= 3V) 0.5 mV
Load Regulation (∆I
L
= 1A) 5 mV
FIGURE 5. Positive Voltage Regulator
(External PNP Pass Transistor)
20125813
Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆V
IN
= 3V) 0.5 mV
Load Regulation (∆I
L
=10mA) 1mV
Short Circuit Current 20 mA
FIGURE 6. Foldback Current Limiting
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Typical Applications (Continued)
20125814
Typical Performance
Regulated Output Voltage +50V
Line Regulation (∆V
IN
= 20V) 15 mV
Load Regulation (∆I
L
= 50 mA) 20 mV
FIGURE 7. Positive Floating Regulator
20125815
Typical Performance
Regulated Output Voltage −100V
Line Regulation (∆V
IN
= 20V) 30 mV
Load Regulation (∆I
L
= 100 mA) 20 mV
FIGURE 8. Negative Floating Regulator
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Typical Applications (Continued)
20125817
Typical Performance
Regulated Output Voltage −15V
Line Regulation (∆V
IN
= 20V) 8 mV
Load Regulation (∆I
L
= 2A) 6 mV
FIGURE 10. Negative Switching Regulator(Note 4)
20125818
Note: Current limit transistor may be used for shutdown if current limiting is not required.
Typical Performance
Regulated Output Voltage +5V
Line Regulation (∆V
IN
= 3V) 0.5 mV
Load Regulation (∆I
L
= 50 mA) 1.5 mV
FIGURE 11. Remote Shutdown Regulator with Current Limiting
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Revision History Section
Date
Released Revision Section Originator Changes
02/15/05 A New Release, Corporate format L. Lytle 1 MDS data sheet converted into one
Corp. data sheet format. MJLM723-X,
Rev. 1A0. MDS data sheet will be
archived.
LM723JAN
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Physical Dimensions inches (millimeters) unless otherwise noted
Metal Can Package (H)
NS Package H10C
Ceramic Dual-In-Line Package (J)
NS Package J14A
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the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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LM723JAN Regulator
