Order this document by MC1723C/D
MC1723C
Voltage Regulator
The MC1723C is a positive or negative voltage regulator designed to
deliver load current to 150 mAdc. Output current capability can be increased
to several amperes through use of one or more external pass transistors.
MC1723C is specified for operation over the commercial temperature range
(0° to +70°C).
•
Output Voltage Adjustable from 2.0 Vdc to 37 Vdc
VOLTAGE REGULATOR
SEMICONDUCTOR
TECHNICAL DATA
•
•
•
Output Current to 150 mAdc Without External Pass Transistors
0.01% Line and 0.03% Load Regulation
Adjustable Short Circuit Protection
Figure 1. Representative Schematic Diagram
VCC
12
500
6.2V
25k
1.0k
1.0k
VC
11
P SUFFIX
PLASTIC PACKAGE
CASE 646
Vz
9
6.2V
15k
15k
100
5.0pF
30k
5.0k
6
Vref
6.2V
300
20k
5
7
150
VEE
4
Inverting
Input
10
VO
13
Compensation
2 Current
Limit
Current
3 Sense
Device
MC1723CD
MC1723CP
D SUFFIX
PLASTIC PACKAGE
CASE 751A
(SO–14)
ORDERING INFORMATION
Alternate
–
LM723CN
µA723PC
TA = 0° to +70°C
Operating
Temperature
Range
Package
SO–14
Plastic DIP
Noninverting
Input
Figure 2. Typical Circuit Connection
(7 < VO < 37)
12
Vin
11
2
3
6
R3
5
Cref
MC1723C
4
C1
13
7
100pF
R2
0.1µF
6
5
R1
Vin = 20Vdc
12
11
MC1723C
4
C1
13
7
100pF
10k
12k
10
RSC
VO
Figure 3. Typical NPN Current Boost Connection
RSC = 0.33
2N3055 or Equiv
10
2
3
VO = +15Vdc
IL = 2Adc max
Vsense
ISC =
VO 7
RSC
For best results 10 k < R2 < 100 k
For minimum drift R3 = R1 | | R2
R1 + R2
R2
^
0.66
=
at TJ = + 25°C
RSC
©
Motorola, Inc. 1996
Rev 5
MOTOROLA ANALOG IC DEVICE DATA
1
MC1723C
MAXIMUM RATINGS
(TA = +25°C, unless otherwise noted.)
Rating
Pulse Voltage from VCC to VEE (50 ms)
Continuous Voltage from VCC to VEE
Input–Output Voltage Differential
Maximum Output Current
Current from Vref
Current from Vz
Voltage Between Noninverting Input and VEE
Differential Input Voltage
Power Dissipation and Thermal Characteristics
TA = +25°C
Derate above TA = +25°C
Thermal Resistance, Junction–to–Air
Operating and Storage Junction Temperature Range
Operating Ambient Temperature Range
Symbol
VI(p)
VI
VI–VO
IL
Iref
Iz
Vie
Vid
PD
1/θJA
θ
JA
TJ, Tstg
TA
Value
50
40
40
150
15
25
8.0
±5.0
1.25
10
100
–65 to +175
0 to +70
Unit
Vpk
Vdc
Vdc
mAdc
mAdc
mA
Vdc
Vdc
W
mW/°C
°C/W
°C
°C
ELECTRICAL CHARACTERISTICS
(TA = +25°C, Vin 12 Vdc, VO = 5.0 Vdc, IL = 1.0 mAdc, RSC = 0, C1 = 100 pF, Cref = 0 and divider
impedance as seen by the error amplifier
≤
10 kΩ connected as shown in Figure 2, unless otherwise noted.)
Characteristics
Input Voltage Range
Output Voltage Range
Input–Output Voltage Differential
Reference Voltage
Standby Current Drain ( IL = 0, Vin = 30 V)
Output Noise Voltage (f = 100 Hz to 10 kHz)
Cref = 0
Cref = 5.0
µF
Average Temperature Coefficient of Output
Voltage (Tlow < TA < Thigh)
Line Regulation
12 V < Vin < 15 V
(TA = 25°C)
12 V < Vin < 40 V
(Tlow < TA < Thigh)
12 V < Vin < 15 V
Load Regulation (1.0 mA < IL < 50 mA)
TA = 25°C
Tlow < TA < Thigh
Ripple Rejection (f = 50 Hz to 10 kHz)
Cref = 0
Cref = 5.0
µF
Short Circuit Current Limit (RSC = 10
Ω,
VO = 0)
Long Term Stability
NOTE:
Tlow to Thigh = 0° to +70°C
Symbol
VI
VO
VI–VO
Vref
IIB
Vn
Min
9.5
2.0
3.0
6.80
–
–
–
Typ
–
–
–
7.15
2.3
20
2.5
0.003
Max
40
37
38
7.50
4.0
–
–
0.015
Unit
Vdc
Vdc
Vdc
Vdc
mAdc
µV(RMS)
TCVO
Regline
–
%/°C
% VO
–
–
–
Regload
–
–
RR
–
–
ISC
^VO/^t
–
–
0.01
0.1
–
0.03
–
74
86
65
0.1
0.1
0.5
0.3
% VO
0.2
0.6
dB
–
–
–
–
mAdc
%/1000 Hr.
2
MOTOROLA ANALOG IC DEVICE DATA
MC1723C
Figure 4. Maximum Load Current as a Function
of Input–Output Voltage Differential
200
160
120
TA = + 25°C
80
40
0
TA = + 75°C
TA = + 125°C
0
10
20
30
Vin–Vout, INPUT–OUTPUT VOLTAGE (V)
40
Reg load , LOAD REGULATION (%VO )
I L (max), LOAD CURRENT (mA)
TJmax = 150°C
RTH = 150°C/W
PSTANDBY 60 mW
(No heatsink)
0.05
Figure 5. Load Regulation Characteristics
Without Current Limiting
0
TA = + 25°C
TA = –55°C
–0.1
TA = + 125°C
–0.05
–0.15
0
20
40
60
IO, OUTPUT CURRENT (mA)
80
100
Figure 6. Load Regulation Characteristics
With Current Limiting
0.05
Reg load , LOAD REGULATION (%VO )
0
TA = –55°C
–0.05
TA = + 25°C
–0.1
–0.15
RSC = 10
Ω
TA = + 125°C
Reg load , LOAD REGULATION (%VO )
0.1
0
–0.1
–0.2
Figure 7. Load Regulation Characteristics
With Current Limiting
TA = –55°C
RSC = 10
Ω
TA = + 25°C
TA = + 125°C
–0.3
–0.4
0
20
–0.2
0
5.0
10
15
20
IO, OUTPUT CURRENT (mA)
25
30
40
60
IO, OUTPUT CURRENT (mA)
80
Figure 8. Current Limiting Characteristics
1.2
RELATIVE OUTPUT VOLTAGE (V)
1.0
0.8
0.6
0.4
0.2
TA = –55°C
0
0
20
40
60
IO, OUTPUT CURRENT (mA)
80
100
TA = + 125°C
TA=+25°C
CURRENT LIMIT SENSE VOLTAGE (V)
RSC = 10
Ω
0.8
Figure 9. Current Limiting Characteristics
as a Function of Junction Temperature
200
0.7
Sense Voltage
160
0.6
Limit Current RSC = 5.0
Ω
120
0.5
Limit Current RSC = 10
Ω
0.4
–50
0
50
100
TJ, JUNCTION TEMPERATURE (°C)
80
40
150
MOTOROLA ANALOG IC DEVICE DATA
3
LIMITING CURRENT (mA)
MC1723C
Figure 10. Line Regulation as a Function
of Input–Output Voltage Differential
0.2
Reg load , LOAD REGULATION (%VO )
Reg in , LINE REGULATION (%VO )
∆V
in = +3 V
0.1
IL = 1.0 to IL = 50 mA
Figure 11. Load Regulation as a Function
of Input–Output Voltage Differential
0.1
0
0
–0.1
–0.1
5.0
15
25
Vin–Vout, INPUT–OUTPUT VOLTAGE (V)
35
–0.2
0
10
20
30
40
Vin–Vout, INPUT–OUTPUT VOLTAGE (V)
50
Figure 12. Standby Current Drain as a
Function of Input Voltage
4.0
VO = Vref
IL = 0
STANDBY CURRENT (mA)
3.0
OUTPUT VOLTAGE DEVIATION (mV)
Figure 13. Line Transient Response
4.0
Input Voltage
2.0
INPUT VOLTAGE DEVIATION (V)
TA = –55°C
2.0
TA = +25°C
1.0
TA = +125°C
0
10
20
30
Vin, INPUT VOLTAGE (V)
40
2.0
Output Voltage
0
0
–2.0
–5.0
0
10
20
t, TIME (µs)
30
40
45
Figure 14. Load Transient Response
10
Load Current
OUTPUT VOLTAGE DEVIATION (mV)
IL = 40 mA
Z O , OUTPUT IMPEDANCE (
Ω
)
LOAD DEVIATION (mA)
0
2.0
0
Output Voltage
–4.0
10
Figure 15. Output Impedance as
Function of Frequency
IL = 50 mA
CI = 0
1.0
CI = 1.0
µF
0.1
–8.0
–5.0
0
10
20
t, TIME (µs)
30
40
45
0.01
100
1.0 k
10 k
f, FREQUENCY (Hz)
100 k
1M
4
MOTOROLA ANALOG IC DEVICE DATA
MC1723C
Figure 16. Typical Connection for 2 < VO < 7
12
+Vin
11
MC1723C
R1
6
4
5
Cref
R2
13
7
1000pF
Vout
VO
3
7
Vsense
a
RA =
10 kΩ where a =
1–a
VO
Vsense
RSC = (1– ) I
a SC
R2
10
2
3
R3
6
MC1723C
RSC
Vout
12
+ Vin
11
2
Figure 17. Foldback Connection
10
RSC
RA
R1
10k
4
13
100pF
Vout
5
^
7
R2
R1 + R2
Vsense
ISC =
RSC
0.66
^
RSC
at TJ = + 25°C
ISC
IL
Iknee
Iknee
–1
ISC
For best results 10 k < R1 +R2 < 100 k
For minimum drift R3 = R1 R2
Figure 18. +5.0 V, 1.0 A Switching Regulator
2N4918 or Equiv
1N4001
or Equiv
Vout
10
MC1723C
2.2k
1.0M
1.0k
5
0.1µF
5.1k
7
2
3
4
100µF
10
+5V
1mH
Figure 19. +5.0 V, 1.0 A High Efficiency Regulator
Vin1
+6.5V
0.1µF
Vin2
+10V
12
10
11
2.0k
+
–
5.1k
7
5
13
1000pF
6
MC1723C
2
3
4
Vout
0.33
+5.0V
11
100
Vin
+10V
12
6
Figure 20. +15 V, 1.0 A Regulator with Remote Sense
0.33
2N3055 or Equiv
+20V
Vin
12
11
10
2
Figure 21. –15 V Negative Regulator
12
11
4
6
MC1723C
100pF
+
+
Vref
10k
–
V2 = 14V
Vout = –15 V
2N3055
or Equiv
–
10µF
12k
10
3
MC1723C
0.1µF
6
5
7
– Sense
Vin = –20 V
4
100pF
13
10k
Load
12k
+ Sense Vout
+15V
5
+
Vref
13
–
7
MOTOROLA ANALOG IC DEVICE DATA
5
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