STMICROELECTRONICS LM723CD

LM723

HIGH PRECISION VOLTAGE REGULATOR
■
■
■
■
■
■
INPUT VOLTAGE UP TO 40V
OUTPUT VOLTAGE ADJUSTABLE FROM 2
TO 37V
POSITIVE OR NEGATIVE SUPPLY
OPERATION
SERIES, SHUNT, SWITCHING OR
FLOATING OPERATION
OUTPUT CURRENT TO 150mA WITHOUT
EXTERNAL PASS TRANSISTOR
ADJUSTABLE CURRENT LIMITING
DESCRIPTION
Plastic DIP-14
SO-14
The LM723 is a monolithic integrated
programmable voltage regulator, assembled in
14-lead dual in-line plastic and SO-14
micropackage. The circuit provides internal
current limiting. When the output current excedes
150mA an external NPN or PNP pass element
may be used. Provisions are made for adjustable
current limiting and remote shut-down.
BLOCK DIAGRAM
September 1998
1/12
LM723
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
LM723
LM723C
Vi
DC Input Voltage
40
40
V
∆V i-o
Dropout Voltage
40
40
V
Io
Output Current
150
150
mA
I ref
Current from Vref
15
25
mA
To p
Operating Temperature
-55 to 125
0 to 70
o
C
T stg
Storage Temperature
-65 to 150
-65 to 150
o
C
150
125
o
C
Plastic DIP-14
SO-14
Tj
Junction Temperature
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
R thj-a mb Thermal Resistance Junction-Ambient
Max
200
160
PIN CONNECTION (top views)
ORDER CODES
Type
Plastic DIP-14
SO-14
LM723
LM723C
LM723N
LM723CN
LM723CD
TEST CIRCUIT (pin configuration relative to the plastic package)
Vi = 12V
Vo = 5V
Io = 1mA
R1/R2 ≤ 10KΩ
2/12
Unit
o
C/W
LM723
ELECTRICAL CHARACTERISTICS FOR LM723 (refer to the test circuits, Tamb = 25 oC,
unless otherwise specified)
Symbol
Parameter
∆V o/∆V i Line Regulation
∆Vo /V o Load Regulation
Test Conditions
Min.
Vi = 12 to 15V
Vi = 12 to 40V
Vi = 12 to 15V
-55 C ≤ Tamb ≤ 125 C
Io = 1 to 50 mA
Io = 1 to 10 mA
-55 C ≤ Tamb ≤ 125 C
o
o
o
o
V REF
Reference Voltage
Iref = 160 µA
SVR
Supply Voltage Rejection
f = 100 Hz to 10 KHz
f = 100 Hz to 10 KHz
6.95
Typ.
Max.
Unit
0.01
0.02
0.1
0.2
0.3
%
%
%
0.03
0.15
0.6
%
%
7.15
7.35
74
86
Cref = 0
Cref = 5 µF
∆V o /∆T Output Voltage Drift
I sc
Output Current Limit
Vi
Input Voltage Range
Vo
Output Voltage Range
150
65
Rsc = 10Ω Vo = 0
Id
Quiescent Current
K VH
Long Term Stability
eN
Output Noise Voltage
40
V
2
37
V
3
38
V
5
mA
Vi = 30 V Io = 0 mA
2.3
BW = 100 Hz to 10 KHz
BW = 100 Hz to 10 KHz
ppm/ oC
mA
9.5
V o -V i
V
dB
dB
Cref = 0
Cref = 5 µF
0.1
%/1000
hrs
20
2.5
µV
µV
ELECTRICAL CHARACTERISTICS FOR LM723C (refer to the test circuits, Tamb = 25 oC,
unless otherwise specified)
Symbol
Parameter
∆V o/∆V i Line Regulation
∆Vo /V o Load Regulation
Test Conditions
Min.
Vi = 12 to 15V
Vi = 12 to 40V
Vi = 12 to 15V
0oC ≤ Tamb ≤ 70oC
Io = 1 to 50 mA
Io = 1 to 10 mA
0 C ≤ Tamb ≤ 70 C
o
V REF
Reference Voltage
Iref = 160 µA
SVR
Supply Voltage Rejection
f = 100 Hz to 10 KHz
f = 100 Hz to 10 KHz
Typ.
Max.
Unit
0.01
0.1
0.1
0.5
0.3
%
%
%
0.03
0.2
0.6
%
%
7.15
7.5
o
6.8
74
86
Cref = 0
Cref = 5 µF
∆V o /∆T Output Voltage Drift
I sc
Output Current Limit
Vi
Input Voltage Range
Vo
Output Voltage Range
150
65
Rsc = 10Ω Vo = 0
V o -V i
Id
Quiescent Current
K VH
Long Term Stability
eN
Output Noise Voltage
Vi = 30 V Io = 0 mA
BW = 100 Hz to 10 KHz
BW = 100 Hz to 10 KHz
ppm/ oC
mA
9.5
40
2
37
V
3
38
V
4
mA
2.3
Cref = 0
Cref = 5 µF
V
dB
dB
V
0.1
%/1000
hrs
20
2.5
µV
µV
3/12
LM723
Figure 1 : Maximum Output Current vs. Voltage
Drop.
Figure 2 : Current Limiting Characteristics.
Figure 3 : Current Limiting Characteristics vs.
Junction Temperature.
Figure 4 : Load Regulation Characteristics
without Current Limiting.
Figure 5 : Load Regulation Characteristics with
Current Limiting.
Figure 6 : Load Regulation Characteristics with
Current Limiting
4/12
LM723
Figure 7 : Line Regulation vs. Voltage Drop.
Figure 8 : Load Regulation vs. Voltage Drop.
Figure 9 : Quiescent Drain Current vs. Input
Voltage.
Figure 10 : Line Transient Response.
Figure 11 : Load Transient Response.
Figure 12 : Output Impedance vs. Frequency.
5/12
LM723
TABLE 1: Resistor Values (KΩ) for standard Output Voltages
Output
Voltage
Applicable Figures
+3
Fixed Output ± 5%
Output Adjustable ± 10% *
R1
R2
R1
P1
R2
13, 16, 17, 18, 21, 23
4.12
3.01
1.8
0.5
1.2
+5
13, 16, 17, 18, 21, 23
2.15
4.99
0.75
0.5
2.2
+6
13, 16, 17, 18, 21, 23
1.15
6.04
0.5
0.5
2.7
+9
14, 16, 17, 18, 21, 23
1.87
7.15
0.75
1
2.7
+12
14, 16, 17, 18, 21, 23
4.87
7.15
2
1
3
+15
14, 16, 17, 18, 21, 23
7.87
7.15
3.3
1
3
+28
14, 16, 17, 18, 21, 23
21
7.15
5.6
1
2
+45
19
3.57
48.7
2.2
10
39
+75
19
3.57
78.7
2.2
10
68
+100
19
3.57
102
2.2
10
91
+250
19
3.57
255
2.2
10
240
-6**
15
3.57
2.43
1.2
0.5
0.75
-9
15
3.48
5.36
1.2
0.5
2
-12
15
3.57
8.45
1.2
0.5
3.3
-15
15
3.65
11.5
1.2
0.5
4.3
-28
15
3.57
24.3
1.2
0.5
10
-45
20
3.57
21.2
2.2
10
33
-100
20
3.57
97.6
2.2
10
91
-250
20
3.57
249
2.2
10
240
Note:
* Replace R1/R2 divider with the circuit of fig24.
** V+ must be connected to a +3V or greater supply.
TABLE 2: Formulae for Intermediate Output Voltages
Outputs from +2 to +7V
Fig.13, 16, 17, 18, 21, 23
R2
V O = [ Vref x
]
R1 + R2
Outputs from +4 to +250V
Fig.19
 Vr ef R2 − R 1
x
; R3 = R 4
VO = 
R1 
 2
Current Limiting
O utputs from +7 to +37V
F ig.14, 16, 17, 18, 21, 23
R1 + R2
V O = [ Vref x
]
Outputs from -6 to -250V
Fig.15, 20
 Vr ef R1 + R 2
; R = R4
VO = 
x
R1  3
 2
Foldback Current Limiting
 VO R3 VSENSE (R3 + R4) 
IKNEE = 
x

R sc R4

 R sc R4
R2
I LIMI T =
I SHORT
6/12
CKT
VSENSE
R sc
 VSENSE R 3 + R4 
=
x
R4 
 Rsc
LM723
APPLICATION INFORMATION (pin numbers relative to the plastic package).
Figure 13 : Basic Low Voltage Regulator
(Vo = 2 to 7V).
R1 × R2
for minimum temperature drift.
R1 + R2
R3 may be eliminated for minimum component count.
Typical performance
Regulated Output Voltage.......................... ................. .........5V
Line Regulation (∆Vi = 3V) ......................... ................. ...0.5mV
Load Regulation (∆IO = 50mA) ................... ................. ... 1.5mV
Note; R3 =
Figure 15 : Negative Voltage Regulator.
Typical performance
Regulated Output Voltage .................... ............... ...............15V
Line Regulation (∆Vi = 3V)............. ................. ................. ..1mV
Load Regulation (∆IO = 100mA) ..................... ................. ..2mV
Figure 14 : Basic High Voltage Regulator
(Vo = 7 to 37V).
R1 × R2
for minimum temperature drift.
R1 + R2
R3 may be eliminated for minimum component count.
Typical performance
Regulated Output Voltage......................... ................. ........ 15V
Line Regulation (∆Vi = 3V).............. ................. .............. 1.5mV
Load Regulation (∆IO = 50mA).................. ................. .... 4.5mV
Note; R3 =
Figure 16 : Positive Voltage Regulator (external
Typical performance
Regulated Output Voltage............... ................. ............... + 15V
Line Regulation (∆Vi = 3V)........................ ................. .... 1.5mV
Load Regulation (∆IO = 1A)............. ................. ............... 15mV
7/12
LM723
APPLICATION INFORMATION (continued).
Figure 17 : Positive Voltage Regulator (External
PNP Pass Transistor)
Typical performance
Regulated Output Voltage.......................... ................. .........5V
Line Regulation (∆Vi = 3V) ......................... ................. ...0.5mV
Load Regulation (∆IO = 1 A) .................. ............... ..........1.5mV
Figure 19 : Positive Floating Regulator
Typical performance
Regulated Output Voltage .................... ............... ............100 V
Line Regulation (∆Vi = 20V)............................ ............... 15 mV
Load Regulation (∆IO = 50mA) ....................... ............ ... 20 mV
8/12
Figure 18 : Foldback current limiting
Typical performance
Regulated Output Voltage......................... ................. ......... 5 V
Line Regulation (∆Vi = 3V).............. ................. .............. 0.5mV
Load Regulation (∆IO = 10mA).................. ................. ....... 1mV
Current Limit Knee..................... ............... ................. ....20 mA
Figure 20 : Negative Floating Regulator
Typical performance
Regulated Output Voltage............... ................. ............ - 100 V
Line Regulation (∆Vi = 20V)...................... ................. .... 30 mV
Load Regulation (∆IO = 100 mA)............... ................. .... 20 mV
LM723
APPLICATION INFORMATION (continued).
Figure 21 : Positive Switching Regulator
Figure 22 : Remote Shutdown Regulator With
Current Limiting
Note: current limi t transistor may be used for shutdown if
current limiting is not required.
Typical performance
Regulated Output Voltage.......................... ................. ........5 V
Line Regulation (∆Vi = 30 V) ........................... ............... 10 mV
Load Regulation (∆IO = 2 A) .................. ............... ..........80 mV
Figure 23 : Shunt Regulator.
Typical performance
Regulated Output Voltage......................... ................. ......... 5 V
Line Regulation (∆Vi = 3 V) ....................... ................. ... 0.5 mV
Load Regulation (∆IO = 50 mA)............ ................. ........ 1.5 mV
Figure 24 : Output Voltage Adjust
Typical performance
Regulated Output Voltage .................... ............... ................5 V
Line Regulation (∆Vi = 10 V)................. ............... .............2 mV
Load Regulation (∆IO = 100 mA) ............... ................. ......5 mV
9/12
LM723
Plastic DIP-14 MECHANICAL DATA
mm
DIM.
MIN.
a1
0.51
B
1.39
TYP.
inch
MAX.
MIN.
TYP.
MAX.
0.020
1.65
0.055
0.065
b
0.5
0.020
b1
0.25
0.010
D
20
0.787
E
8.5
0.335
e
2.54
0.100
e3
15.24
0.600
F
7.1
0.280
I
5.1
0.201
L
Z
3.3
1.27
0.130
2.54
0.050
0.100
P001A
10/12
LM723
SO-14 MECHANICAL DATA
mm
DIM.
MIN.
TYP.
A
a1
inch
MAX.
MIN.
TYP.
1.75
0.1
0.068
0.2
a2
MAX.
0.003
0.007
1.65
0.064
b
0.35
0.46
0.013
0.018
b1
0.19
0.25
0.007
0.010
C
0.5
0.019
c1
45 (typ.)
D
8.55
E
5.8
8.75
0.336
6.2
0.228
0.344
0.244
e
1.27
0.050
e3
7.62
0.300
F
3.8
4.0
0.149
0.157
G
4.6
5.3
0.181
0.208
L
0.5
1.27
0.019
0.050
M
S
0.68
0.026
8 (max.)
P013G
11/12
LM723
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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 1998 STMicroelectronics – Printed in Italy – All Rights Reserved
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12/12