LM723QML
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
LM723E/883 E20A 20LD LEADLESS CHIP CARRIER
LM723H/883 H10C 10LD T0–100, METAL CAN
LM723J/883 J14A 14LD CERDIP
Connection Diagrams
Dual-In-Line Package Metal Can Package
20120402
Top View
See NS Package J14A
20120403
Note: Pin 5 connected to case.
Top View
See NS Package H10C
20120420
Top View
See NS Package E20A
February 2005
LM723QML Regulator
© 2005 National Semiconductor Corporation DS201204 www.national.com
Equivalent Circuit*
20120404
*Pin numbers refer to metal can package.
Schematic Diagram
20120401
LM723QML
www.national.com 2
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
Maximum Amplifier Input
Voltage
Either Input
Differential
8.5V
5V
Current from V
Z
25 mA
Current from V
REF
15 mA
Internal Power Dissipation
Metal Can (Note 2) 800 mW
Cavity DIP (Note 2) 900 mW
LCC (Note 2) 900 mW
Operating Temperature
Range
−55˚C ≤T
A
≤+125˚C
Maximum T
J
+150˚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) 100˚C/W
Cerdip
(500LF/ Min Air flow) 61˚C/W
Metal Can
(Still Air) 156˚C/W
Metal Can
(500LF/ Min Air flow) 89˚C/W
LCC
(Still Air) 96˚C/W
LCC
(500LF/ Min Air flow) 70˚C/W
θ
JC
CERDIP
Metal Can
LCC
22˚C/W
37˚C/W
27˚C/W
ESD Tolerance (Note 3) 500V
Quality Conformance Inspection
MIL-STD-883, Method 5005 — Group A
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
LM723QML
www.national.com3
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
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
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 V
IN
= 40V, V
OUT
= 7.15V, I
Z
= 1mA (Note 8)
(Note 10)
5.58 6.82 V 1
V
OUT
Output Voltage V
IN
= 12V, V
OUT
= 5V, I
L
= 1mA 4.5 5.5 V 1, 2, 3
Electrical Characteristics
AC Parameters (Note 9)
Symbol Parameter Conditions Not es Min Max Units Sub-
groups
Delta V
OUT
Delta V
IN
Ripple Rejection f = 120H
Z
,C
REF
=0,V
INS
=2V
RMS
55 dB 4
f = 120H
Z
,C
REF
= 5µF,
V
INS
=2V
RMS
67 dB 4
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 DIPS only.
LM723QML
www.national.com 4
Typical Performance Characteristics
Load Regulation
Characteristics with
Current Limiting
Load Regulation
Characteristics with
Current Limiting
20120422 20120423
Load & Line Regulation vs
Input-Output Voltage
Differential
Current Limiting
Characteristics
20120424 20120425
Current Limiting
Characteristics vs
Junction Temperature
Standby Current Drain vs
Input Voltage
20120426 20120427
LM723QML
www.national.com5
Typical Performance Characteristics (Continued)
Line Transient Response Load Transient Response
20120428 20120429
Output Impedence vs
Frequency
20120430
Maximum Power Ratings
Noise vs Filter Capacitor
(C
REF
in Circuit of Figure 1
(Bandwidth 100 Hz to 10 kHz)
Power Dissipation vs
Ambient Temperature
20120431 20120432
LM723QML
www.national.com 6
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
(Figure 1 Figures 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)
LM723QML
www.national.com7
Typical Applications
20120408
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)
20120409
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)
LM723QML
www.national.com 8
Typical Applications (Continued)
20120410
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
20120411
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)
LM723QML
www.national.com9
Typical Applications (Continued)
20120412
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)
20120413
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
LM723QML
www.national.com 10
Typical Applications (Continued)
20120414
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
20120415
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
LM723QML
www.national.com11
Typical Applications (Continued)
20120417
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)
20120418
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
LM723QML
www.national.com13
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. MNLM723-X,
Rev. 1A0. MDS data sheet will be
archived. AC and Drift parameters
removed from specifcation because they
only applied to the JAN B/S devices,
covered in a separate datasheet.
LM723QML
www.national.com15
Physical Dimensions inches (millimeters) unless otherwise noted
Leadless Chip Carrier Package (E)
NS Package E20A
Metal Can Package (H)
NS Package H10C
LM723QML
www.national.com 16
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
Ceramic Dual-In-Line Package (J)
NS Package J14A
LM723QML
www.national.com17
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
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.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
National Semiconductor
Americas Customer
Support Center
Email: new.feedback@nsc.com
Tel: 1-800-272-9959
National Semiconductor
Europe Customer Support Center
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Support Center
Email: ap.support@nsc.com
National Semiconductor
Japan Customer Support Center
Fax: 81-3-5639-7507
Email: jpn.feedback@nsc.com
Tel: 81-3-5639-7560
www.national.com
LM723QML Regulator
