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A723
PRECISION VOLTAGE REGULATORS
SLVS057D AUGUST 1972 REVISED JULY 1999
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D
150-mA Load Current Without External
Power Transistor
D
Adjustable Current-Limiting Capability
D
Input Voltages up to 40 V
D
Output Adjustable From 2 V to 37 V
D
Direct Replacement for Fairchild
A723C
description
The
A723 is a precision integrated-circuit
voltage regulator, featuring high ripple rejection,
excellent input and load regulation, excellent temperature stability, and low standby current. The circuit consists
of a temperature-compensated reference-voltage amplifier, an error amplifier, a 150-mA output transistor, and
an adjustable-output current limiter.
The
A723 is designed for use in positive or negative power supplies as a series, shunt, switching, or floating
regulator. For output currents exceeding 150 mA, additional pass elements can be connected as shown in
Figures 4 and 5.
The
A723C is characterized for operation from 0
C to 70
C.
AVAILABLE OPTIONS
PACKAGED DEVICES
CHIP
TA
PLASTIC
DIP
(N)
SMALL
OUTLINE
(D)
CHIP
FORM
(Y)
0
C to 70
C
A723CN
A723CD
A723Y
The D package is available taped and reeled. Add the suffix
R to the device type (e.g.,
A723CDR). Chip forms are
tested at 25
C.
functional block diagram
+
VCC
CURR LIM CURR SENS
VZ
Current
Limiter
VC
Series Pass
Transistor
Regulated
Output
VCC+
Ref
Amp
Current
Source
Temperature-
Compensated
Reference Diode
FREQ COMP
REF
IN
IN+
Error
Amp
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright
1999, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
2
3
4
5
6
7
14
13
12
11
10
9
8
NC
CURR LIM
CURR SENS
IN
IN+
REF
V
CC
NC
FREQ COMP
V
CC+
V
C
OUTPUT
V
Z
NC
D OR N PACKAGE
(TOP VIEW)
A723
PRECISION VOLTAGE REGULATORS
SLVS057D AUGUST 1972 REVISED JULY 1999
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
schematic
VCC+
VC
15 k
OUTPUT
6.2 V
VZ
FREQ COMP
CURR SENS
CURR LIM
IN
IN+
REF
150
1 k
20 k
300
5 k
30 k
100
1 k
25 k
500
15 k
5 pF
VCC
Resistor and capacitor values shown are nominal.
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Peak voltage from V
CC+
to V
CC
(t
w
50 ms)
50 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous voltage from V
CC+
to V
CC
40
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input-to-output voltage differential
40 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Differential input voltage to error amplifier
5 V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage between noninverting input and V
CC
8
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current from V
Z
25 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current from REF
15 mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance,
JA
(see Notes 1 and 2): D package
86
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
N package
101
C/W
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package
260
C
. . . . . . . . . . . . . . . .
Storage temperature range, T
stg
65
C to 150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
NOTES:
1. Maximum power dissipation is a function of TJ(max),
JA, and TA. The maximum allowable power dissipation at any allowable
ambient temperature is PD = (TJ(max) TA)/
JA. Operating at the absolute maximum TJ of 150
C can impact reliability.
2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.
A723
PRECISION VOLTAGE REGULATORS
SLVS057D AUGUST 1972 REVISED JULY 1999
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
recommended operating conditions
MIN
MAX
UNIT
Input voltage, VI
9.5
40
V
Output voltage, VO
2
37
V
Input-to-output voltage differential, VC VO
3
38
V
Output current, IO
150
mA
Operating free-air temperature range, TA
A723C
0
70
C
electrical characteristics at specified free-air temperature (see Notes 3 and 4)
PARAMETER
TEST CONDITIONS
T
A723C
UNIT
PARAMETER
TEST CONDITIONS
TA
MIN
TYP
MAX
UNIT
VI = 12 V to VI = 15 V
25
C
0.1
1
Input regulation
VI = 12 V to VI = 40 V
25
C
1
5
mV/V
VI = 12 V to VI = 15 V
0
C to 70
C
3
Ripple rejection
f = 50 Hz to 10 kHz,
Cref = 0
25
C
74
dB
Ripple rejection
f = 50 Hz to 10 kHz,
Cref = 5
F
25
C
86
dB
Output regulation
25
C
0.3
2
mV/V
Output regulation
0
C to 70
C
6
mV/V
Reference voltage, Vref
25
C
6.8
7.15
7.5
V
Standby current
VI = 30 V,
IO = 0
25
C
2.3
4
mA
Temperature coefficient of output voltage
0
C to 70
C
0.003
0.015
%/
C
Short-circuit output current
RSC = 10
,
VO = 0
25
C
65
mA
Output noise voltage
BW = 100 Hz to 10 kHz,
Cref = 0
25
C
20
V
Output noise voltage
BW = 100 Hz to 10 kHz,
Cref = 5
F
25
C
2.5
V
NOTES:
3. For all values in this table, the device is connected as shown in Figure 1 with the divider resistance as seen by the error amplifier
10 k
. Unless otherwise specified, VI = VCC+ = VC = 12 V, VCC = 0, VO = 5 V, IO = 1 mA, RSC = 0, and Cref = 0.
4. Pulse-testing techniques must be used that will maintain the junction temperature as close to the ambient temperature as possible.
electrical characteristics, T
A
= 25
C (see Notes 3 and 4)
PARAMETER
TEST CONDITIONS
A723Y
UNIT
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input regulation
VI = 12 V to VI = 15 V
0.1
mV/V
Input regulation
VI = 12 V to VI = 40 V
1
mV/V
Ripple rejection
f = 50 Hz to 10 kHz,
Cref = 0
74
dB
Ripple rejection
f = 50 Hz to 10 kHz,
Cref = 5
F
86
dB
Output regulation
0.3
mV/V
Reference voltage, Vref
7.15
V
Standby current
VI = 30 V,
IO = 0
2.3
mA
Short-circuit output current
RSC = 10
,
VO = 0
65
mA
Output noise voltage
BW = 100 Hz to 10 kHz,
Cref = 0
20
V
Output noise voltage
BW = 100 Hz to 10 kHz,
Cref = 5
F
2.5
V
NOTES:
3. For all values in this table, the device is connected as shown in Figure 1 with the divider resistance as seen by the error amplifier
10 k
. Unless otherwise specified, VI = VCC+ = VC = 12 V, VCC = 0, VO = 5 V, IO = 1 mA, RSC = 0, and Cref = 0.
4. Pulse-testing techniques must be used that will maintain the junction temperature as close to the ambient temperature as possible.
A723
PRECISION VOLTAGE REGULATORS
SLVS057D AUGUST 1972 REVISED JULY 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 1. Resistor Values (k
) for Standard Output Voltages
OUTPUT
VOLTAGE
APPLICABLE
FIGURES
FIXED OUTPUT
5%
OUTPUT ADJUSTABLE
10%
(SEE NOTE 6)
(V)
(SEE NOTE 5)
R1
(k
)
R2
(k
)
R1
(k
)
P1
(k
)
P2
(k
)
3.0
1, 5, 6, 9, 11, 12 (4)
4.12
3.01
1.8
0.5
1.2
3.6
1, 5, 6, 9, 11, 12 (4)
3.57
3.65
1.5
0.5
1.5
5.0
1, 5, 6, 9, 11, 12 (4)
2.15
4.99
0.75
0.5
2.2
6.0
1, 5, 6, 9, 11, 12 (4)
1.15
6.04
0.5
0.5
2.7
9.0
2, 4, (5, 6, 9, 12)
1.87
7.15
0.75
1.0
2.7
12
2, 4, (5, 6, 9, 12)
4.87
7.15
2.0
1.0
3.0
15
2, 4, (5, 6, 9, 12)
7.87
7.15
3.3
1.0
3.0
28
2, 4, (5, 6, 9, 12)
21.0
7.15
5.6
1.0
2.0
45
7
3.57
48.7
2.2
10
39
75
7
3.57
78.7
2.2
10
68
100
7
3.57
105
2.2
10
91
250
7
3.57
255
2.2
10
240
6
(see Note 7)
3, 10
3.57
2.43
1.2
0.5
0.75
9
3, 10
3.48
5.36
1.2
0.5
2.0
12
3, 10
3.57
8.45
1.2
0.5
3.3
15
3, 10
3.57
11.5
1.2
0.5
4.3
28
3, 10
3.57
24.3
1.2
0.5
10
45
8
3.57
41.2
2.2
10
33
100
8
3.57
95.3
2.2
10
91
250
8
3.57
249
2.2
10
240
NOTES:
5. The R1/R2 divider can be across either VO or V(ref). If the divider is across
V(ref), use the figure numbers without parentheses. If the divider is across
VO, use the figure numbers in parentheses.
6. To make the voltage adjustable, the R1/R2 divider shown in the figures must
be replaced by the divider shown below.
R1
P1
R2
Adjustable Output Circuit
7. For Figures 3, 8, and 10, the device requires a minimum of 9 V between VCC+
and VCC when VO is equal to or more positive than 9 V.
A723
PRECISION VOLTAGE REGULATORS
SLVS057D AUGUST 1972 REVISED JULY 1999
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Table 2. Formulas for Intermediate Output Voltages
OUTPUTS FROM 2 V TO 7 V
SEE FIGURES 1, 5, 6, 9, 11, 12 (4)
AND NOTE 5
OUTPUTS FROM 4 V TO 250 V
SEE FIGURE 7 AND NOTE 5
CURRENT LIMITING
V
O
+
V
(ref)
R2
R1
)
R2
V
O
+
V
(ref)
2
R2 R1
R1
R3
+
R4
I
(limit)
[
0.65 V
R
SC
OUTPUTS FROM 7 V TO 37 V
SEE FIGURES 2, 4, (5, 6, 9, 11, 12)
AND NOTE 5
OUTPUTS FROM 6 V TO 250 V
SEE FIGURES 3, 8, 10
AND NOTES 5 AND 7
FOLDBACK CURRENT LIMITING
SEE FIGURE 6
V
O
+
V
(ref)
R1
)
R2
R2
V
O
+
V
(ref)
2
R1
)
R2
R1
R3
+
R4
I
(knee)
[
V
O
R3
)
(R3
)
R4) 0.65 V
R
SC
R4
I
OS
[
0.65 V
R
SC
R3
)
R4
R4
NOTES:
5. The R1/R2 divider can be across either VO or V(ref). If the divider is across V(ref), use figure numbers without parentheses. If the
divider is across VO, use the figure numbers in parentheses.
7. For Figures 3, 8, and 10, the device requires a minimum of 9 V between VCC+ and VCC when VO is equal to or more positive than
9 V.
REF
VI
VCC+
VC
OUTPUT
VZ
CURR LIM
CURR SENS
IN+
VCC FREQ COMP
IN
RSC
R1
C(ref)
R2
100 pF
Regulated
Output, VO
R3 (see Notes A and B)
A723
NOTES: A.
B. R3 can be eliminated for minimum component count. Use direct connection (i.e., R3 = 0).
R3
+
R1
R2
R1
)
R2
for a minimum
a
V
O
Figure 1. Basic Low-Voltage Regulator (V
O
= 2 V to 7 V)