CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper I.C. Handling Procedures.
Copyright
Harris Corporation 1994
7-3
S E M I C O N D U C T O R
Description
The CA723 and CA723C are silicon monolithic integrated cir-
cuits designed for service as voltage regulators at output volt-
ages ranging from 2V to 37V at currents up to 150mA.
Each type includes a temperature-compensated reference
amplifier, an error amplifier, a power series pass transistor, and
a current-limiting circuit. They also provide independently acces-
sible inputs for adjustable current limiting and remote shutdown
and, in addition, feature low standby current drain, low tempera-
ture drift, and high ripple rejection.
The CA723 and CA723C may be used with positive and nega-
tive power supplies in a wide variety of series, shunt, switching,
and floating regulator applications. They can provide regulation
at load currents greater than 150mA and in excess of 10A with
the use of suitable n-p-n or p-n-p external pass transistors.
The CA723 and CA723C are supplied in the 10 lead TO-100
metal can(T suffix), and the 14 lead dual-in-line plastic package
(E suffix), and are direct replacements for industry types LM723,
LM723C in packages with similar terminal arrangements.
Features
Up to 150mA Output Current
Positive and Negative Voltage Regulation
Regulation in Excess of 10A with Suitable Pass
Transistors
Input and Output Short-Circuit Protection
Load and Line Regulation . . . . . . . . . . . . . . . . . . . 0.03%
Direct Replacement for 723 and 723C Industry Types
Adjustable Output Voltage . . . . . . . . . . . . . . . 2V to 37V
Applications
Series and Shunt Voltage Regulator
Floating Regulator
Switching Voltage Regulator
High-Current Voltage Regulator
Temperature Controller
Ordering Information
PART
TEMPERATURE
PACKAGE
CA723E
-55
o
C to +125
o
C
14Lead Plastic DIP
CA723T
-55
o
C to +125
o
C
10 Pin Metal Can
CA723CE
0
o
C to +70
o
C
14 Lead Plastic DIP
CA723CT
0
o
C to +70
o
C
10 Pin Metal Can
Pinouts
CA723 (PDIP)
TOP VIEW
CA723C (CAN)
TOP VIEW
14
13
12
11
10
9
8
7
6
5
4
3
2
1
+
VOLT
REF
AMP
ERROR
NC
V-
NON-INV
INPUT
V
REF
CURRENT
SENSE
CURRENT
LIMIT
INV
INPUT
V
C
V
O
V
Z
NC
NC
FREQ
COMP
INPUT
V+ UNREG
-
+
ERROR
AMP
VOLT
REF
TAB
CURRENT LIMIT
NON-INV
INPUT
INV
INPUT
CURRENT
SENSE
FREQ
COMP
V+
6
5
4
3
V
REF
V
O
7 V
C
8
2
1
9
10
UNREG
INPUT
-
V-, (CASE INTERNALLY
CONNECTED TO TERM 5)
Functional Block Diagram
V+
VOLT
REF
AMP
+
ERROR
AMP
INVERTING
INPUT
NON-INVERTING
INPUT
TEMPERATURE-
COMPENSATED
ZENER
UNREGULATED
INPUT
FREQUENCY
COMPENSATION
CURRENT
LIMITER
CURRENT
SENSE
CURRENT
LIMIT
SERIES PASS
TRANSISTOR
V-
V
Z
OUTPUT
V
O
REGULATED
V
C
V
REF
-
April 1994
CA723, CA723C
Voltage Regulators Adjustable from 2V to 37V at Output
Currents Up to 150mA Without External Pass Transistors
File Number
788.3
7-4
Specifications CA723, CA723C
Absolute Maximum Ratings
Operating Conditions
DC Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
(Between V+ and V- Terminals)
Pulse Voltage for 50ms
Pulse Width (Between V+ and V- Terminals) . . . . . . . . . . . . . 50V
Differential Input-Output Voltage . . . . . . . . . . . . . . . . . . . . . . . . 40V
Differential Input Voltage
Between Inverting and Noninverting Inputs
. . . . . . . . . . . . . . . .
5V
Between Noninverting Input and V- . . . . . . . . . . . . . . . . . . . . . 8V
Current From Zener Diode Terminal (V
Z
) . . . . . . . . . . . . . . . . . 25mA
Thermal Resistance
JA
JC
Plastic DIP Package . . . . . . . . . . . . . . . . 120
o
C/W
-
Metal Can . . . . . . . . . . . . . . . . . . . . . . . . 136
o
C/W
65
o
C/W
Device Dissipation
CA723T, CA723CT, Up to T
A
= +25
o
C. . . . . . . . . . . . . . . . 900mW
CA723E, CA723CE, Up to T
A
= +25
o
C . . . . . . . . . . . . . . 1000mW
CA723T, CA723CT, Above T
A
= +25
o
C . . . . . . . . . . . . . 7.4mW/
o
C
CA723E, CA723CE, Above T
A
= +25
o
C . . . . . . . . . . . . 8.3mW/
o
C
Ambient Temperature Range
Operating Temperature Range . . . . . . . . . . . . . . -55
o
C to +125
o
C
Storage Temperature Range . . . . . . . . . . . . . . . . -65
o
C to +150
o
C
Lead Temperature, During Soldering . . . . . . . . . . . . . . . . . . +265
o
C
At a distance 1/16"
1/32" (1.59mm
0.79mm) from case for 10s
max
CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
DC Electrical Specifications
T
A
= +25
o
C, V+ = V
C
= V
I
= 12V, V- = 0, V
O
= 5V, I
L
= 1mA, C
1
= 100pF, C
REF
= 0, R
SCP
= 0,
Unless Otherwise Specified. Divider impedance R
1
R
2
R
1
+ R
2
at noninverting input, Terminal 5 =
10k
. (Figure 20)
PARAMETERS
TEST CONDITION
CA723
CA723C
UNITS
MIN
TYP
MAX
MIN
TYP
MAX
DC CHARACTERISTICS
Quiescent Regulator Current, I
Q
I
L
= 0, V
I
= 30V
-
2.3
3.5
-
2.3
4
mA
Input Voltage Range, V
I
9.5
-
40
9.5
-
40
V
Output Voltage Range, V
O
2
-
37
2
-
37
V
Differential Input-Output Voltage, V
I
- V
O
3
-
38
3
-
38
V
Reference Voltage, V
REF
6.95
7.15
7.35
6.8
7.15
7.5
V
Line Regulation (Note 1)
V
I
= 12V to 40V
-
0.02
0.2
-
0.1
0.5
% V
O
V
I
= 12V to 15V
-
0.01
0.1
-
0.01
0.1
% V
O
V
I
= 12V to 15V,
T
A
= -55
o
C to +125
o
C
-
-
0.3
-
-
-
% V
O
V
I
= 12V to 15V,
T
A
= 0
o
C to +70
o
C
-
-
-
-
-
0.3
% V
O
Load Regulation (Note 1)
I
L
= 1mA to 50mA
-
0.03
0.15
-
0.03
0.2
% V
O
I
L
= 1mA to 50mA,
T
A
= -55
o
C to +125
o
C
-
-
0.6
-
-
-
% V
O
I
L
= 1mA to 50mA,
T
A
= 0
o
C to +70
o
C
-
-
-
-
-
0.6
% V
O
Output-Voltage Temperature Coeffi-
cient,
V
O
T
A
= -55
o
C to +125
o
C
-
0.002
0.015
-
-
-
%/
o
C
T
A
= 0
o
C to +70
o
C
-
-
-
-
0.003
0.015
%/
o
C
Ripple Rejection (Note 2)
f = 50Hz to 10kHz
-
74
-
-
74
-
dB
f = 50Hz to 10kHz,
C
REF
= 5
F
-
86
-
-
86
-
dB
Short Circuit Limiting Current, I
LIM
R
SCP
= 10
, V
O
= 0
-
65
-
-
65
-
mA
Equivalent Noise RMS Output Voltage,
V
N
(Note 2)
BW = 100Hz to 10kHz,
C
REF
= 0
-
-20
-
-
20
-
V
BW = 100Hz to 10kHz,
C
REF
= 5
F
-
2.5
-
-
2.5
-
V
NOTES:
1. Line and load regulation specifications are given for condition of a constant chip temperature. For high dissipation condition, temperature
drifts must be separately taken into account.
2. For C
REF
(See Figure 20)
7-5
CA723, CA723C
FIGURE 1. EQUIVALENT SCHEMATIC DIAGRAM OF THE CA723 AND CA723C
Typical Performance Curves (CA723)
FIGURE 2. MAX LOAD CURRENT vs DIFFERENTIAL INPUT-
OUTPUT VOLTAGE
FIGURE 3. LOAD REGULATION WITHOUT CURRENT LIMIT-
ING
FIGURE 4. LOAD REGULATION WITH CURRENT LIMITING
FIGURE 5. LOAD REGULATION WITH CURRENT LIMITING
V+
UNREGULATED
INPUT
D1
6.2V
R2
15k
R1
500
R3
25k
D3
Q3
Q4
Q5
Q1
Q6
C1
5pF
R7
30k
R8
5k
D2
6.2V
V
REF
R6
100
Q10
R9
300
R10
20k
Q9
Q7
R4
1k
R5
1k
Q8
Q14
Q15
Q11 Q12
R11
150
Q13
Q16
R12
15k
D4
V
Z
FREQUENCY
COMPENSATION
V
O
V
C
CURRENT
LIMIT
CURRENT
SENSE
NON-INVERTING
INPUT
V-
INVERTING
INPUT
MAX JUNCTION TEMP (T
J
) = +150
o
C
THERMAL RESISTANCE = 150
o
C/W
QUIESCENT DISSIPATION (PQ) = 60mW
(NO HEAT SINK)
150
100
50
0
MAXIMUM LOAD CURRENT (mA)
AMBIENT TEMPERATURE (T
A
) = +25
o
C
+125
o
C
0
10
20
30
40
DIFFERENTIAL INPUT - OUTPUT VOLTAGE (V)
OUTPUT VOLTAGE (V
O
) = 5V
SHORT CIRCUIT PROTECTION
RESISTANCE (R
SCP
) = 0
INPUT VOLTAGE (V
I
) = 12V
LOAD REGULATION (V
O
)
0.05
0
-0.05
-0.1
-0.15
-0.2
AMBIENT TEMPERATURE
-55
o
C
+125
o
C
0
20
40
60
80
100
OUTPUT CURRENT (mA)
(T
A
) = +25
o
C
OUTPUT VOLTAGE (V
O
) = 5V
SHORT CIRCUIT PROTECTION
RESISTANCE (R
SCP
) = 10
INPUT VOLTAGE (V
I
) = 12V
-55
o
C
+125
o
C
0.05
0
-0.05
-0.1
-0.15
-0.2
-0.25
LOAD REGULATION (V
O
)
OUTPUT CURRENT (mA)
0
5
10
15
20
25
30
AMBIENT TEMP (T
A
) = +25
o
C
OUTPUT CURRENT (mA)
OUTPUT VOLTAGE (V
O
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