le border=0 cellpadding=0 cellspacing=0 width=100%>
Yahoo! is not affiliated with the authors of this page or responsible for its content.
LM723JAN Voltage Regulator
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
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
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
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
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
= 125C)
Metal Can (Note 2)
300 mW
Cavity DIP (Note 2)
400 mW
Maximum T
J
+175C
Storage Temperature Range
65C
T
A
+150C
Lead Temperature
(Soldering, 4 sec. max.)
300C
Thermal Resistance JA
Cerdip (Still Air)
Cerdip (500LF/ Min Air flow)
Metal Can (Still Air)
Metal Can (500LF/ Min Air flow)
100C/W
61C/W
156C/W
89C/W JC
CERDIP
Metal Can
22C/W
37C/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
55C
T
A
+125C
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
LM723JAN
www.national.com
3 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
= 10
, 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
25C
T
A
+125C, V
IN
= 12V,
V
OUT
= 5V, I
L
= 1mA
(Note 12)
0.01
0.01
%/C
8A
55C
T
A
+25C, 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
7
µV
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
= 0
,
Delta V
IN
= 3V for 25µsec
0
10
mV/V
4
LM723JAN
www.national.com
4 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
= 0
,
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 T
JMAX
, JA
, and the ambient temperature,
T
A
. The maximum available power dissipation at any temperature is P
d
= (T
JMAX
T
A
)/ JA
or the number given in the Absolute Maximum Ratings, whichever is less.
See derating curves for maximum power rating above 25C.
Note 3: Human body model, 1.5 k
in series with 100 pF.
Note 4: L
1
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.
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 V
CC
must be connected to a +3V or greater supply.
Note 8: For metal can applications where V
Z
is required, an external 6.2V zener diode should be connected in series with V
OUT
.
Note 9: Unless otherwise specified, T
A
= 25C, V
IN
= V
+
= V
C
= 12V, V = 0, V
OUT
= 5V, I
L
= 1 mA, R
SC
= 0, C
1
= 100 pF, C
REF
= 0 and divider impedance as seen
by error amplifier
10 k connected 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
LM723JAN
www.national.com
5 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
LM723JAN
www.national.com
6 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
LM723JAN
www.national.com
7 TABLE 1. Resistor Values (k
) 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