Texas Instruments ua723 INSTALLATION INSTRUCTIONS

CHIP

µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

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 µA723C

description

The µA723 is a precision integrated-circuit

CURR LIM

CURR SENS

D OR N PACKAGE

(TOP VIEW)

NC

1
2
3

IN–

4

IN+

5
6

REF

CC–

7

V

NC

14

FREQ COMP

13

V

12

V

11

OUTPUT

10

9

V

8

NC

CC+
C

Z

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 µA723 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 µA723C is characterized for operation from 0°C to 70°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

T

A

0°C to 70°C µA723CN µA723CD µA723Y

The D package is available taped and reeled. Add the suffix
R to the device type (e.g., µA723CDR). Chip forms are
tested at 25°C.

PLASTIC

DIP

(N)

SMALL

OUTLINE

(D)

FORM

(Y)

functional block diagram

Temperature-

Compensated

Reference Diode

Current

Source

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.

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.

Ref
Amp

V

REF

V

CC+

CC–

IN–

IN+

FREQ COMP

–

Error
Amp

+

CURR LIM CURR SENS

Copyright  1999, Texas Instruments Incorporated

Current
Limiter

V

C

Series Pass
Transistor

Regulated
Output

V

Z

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1

µA723
PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

schematic

500 Ω

15 kΩ

Resistor and capacitor values shown are nominal.

25 kΩ

100 Ω

5 pF

30 kΩ

5 kΩ

1 kΩ

300 Ω

20 kΩ

V

CC–

1 kΩ

150 Ω

V

CC+

15 kΩ

IN–IN+REF

V

C

6.2 V

OUTPUT

V

Z

FREQ COMP

CURR LIM

CURR SENS

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

Peak voltage from V
Continuous voltage from V

Input-to-output voltage differential 40 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Differential input voltage to error amplifier ±5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage between noninverting input and V

Current from VZ 25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current from REF 15 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Package thermal impedance, θ

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds: D or N package 260°C. . . . . . . . . . . . . . . .

Storage temperature range, T

†

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),

ambient temperature is PD = (TJ(max) – TA)/

2. The package thermal impedance is calculated in accordance with JESD 51, except for through-hole packages, which use a trace
length of zero.

CC+

to V

CC+

(tw ≤ 50 ms) 50 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC–

to V

JA

40 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC–

8 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

CC–

(see Notes 1 and 2): D package 86°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . .

N package 101°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . .

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

stg

θ

, and TA. The maximum allowable power dissipation at any allowable

θ

JA

JA

. Operating at the absolute maximum TJ of 150°C can impact reliability.

†

2

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PARAMETER

TEST CONDITIONS

T

UNIT

Ripple rejection

dB

Output regulation

mV/V

Output noise voltage

V

PARAMETER

TEST CONDITIONS

UNIT

Input regulation

mV/V

Ripple rejection

dB

Output noise voltage

V

µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

recommended operating conditions

MIN MAX UNIT

Input voltage, V
Output voltage, V
Input-to-output voltage differential, VC – V
Output current, I
Operating free-air temperature range, T

I

O

O

O

A

µA723C 0 70 °C

electrical characteristics at specified free-air temperature (see Notes 3 and 4)

A

VI = 12 V to VI = 15 V 25°C 0.1 1

Input regulation

pp

p

Reference voltage, 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 Ω, VO = 0 25°C 65 mA

p

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 kΩ. Unless otherwise specified, VI = V

4. Pulse-testing techniques must be used that will maintain the junction temperature as close to the ambient temperature as possible.

ref

VI = 12 V to VI = 40 V 25°C 1 5
VI = 12 V to VI = 15 V 0°C to 70°C 3
f = 50 Hz to 10 kHz, C
f = 50 Hz to 10 kHz, C

BW = 100 Hz to 10 kHz, C
BW = 100 Hz to 10 kHz, C

= VC = 12 V, V

CC+

= 0 25°C 74

ref

= 5 µF 25°C 86

ref

25°C –0.3 –2

0°C to 70°C –6

25°C 6.8 7.15 7.5 V

= 0 25°C 20

ref

= 5 µF 25°C 2.5

ref

= 0, VO = 5 V, IO = 1 mA, RSC = 0, and C

CC–

MIN TYP MAX

9.5 40 V
2 37 V
3 38 V

µA723C

ref

150 mA

mV/V

µ

= 0.

electrical characteristics, TA = 25°C (see Notes 3 and 4)

µA723Y

MIN TYP MAX

p

pp

Output regulation –0.3 mV/V
Reference voltage, V
Standby current VI = 30 V, IO = 0 2.3 mA
Short-circuit output current RSC = 10 Ω, VO = 0 65 mA

p

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 kΩ. Unless otherwise specified, VI = V

4. Pulse-testing techniques must be used that will maintain the junction temperature as close to the ambient temperature as possible.

ref

VI = 12 V to VI = 15 V 0.1
VI = 12 V to VI = 40 V 1
f = 50 Hz to 10 kHz, C
f = 50 Hz to 10 kHz, C

BW = 100 Hz to 10 kHz, C
BW = 100 Hz to 10 kHz, C

= VC = 12 V, V

CC+

= 0, VO = 5 V, IO = 1 mA, RSC = 0, and C

CC–

= 0 74

ref

= 5 µF 86

ref

= 0 20

ref

= 5 µF 2.5

ref

7.15 V

ref

µ

= 0.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

3

µA723
PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

APPLICATION INFORMATION

Table 1. Resistor Values (kΩ) for Standard Output Voltages

OUTPUT

VOLTAGE

(V) (SEE NOTE 5)

3.0 1, 5, 6, 9, 1 1, 12 (4) 4.12 3.01 1.8 0.5 1.2

3.6 1, 5, 6, 9, 1 1, 12 (4) 3.57 3.65 1.5 0.5 1.5

5.0 1, 5, 6, 9, 1 1, 12 (4) 2.15 4.99 0.75 0.5 2.2

6.0 1, 5, 6, 9, 1 1, 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)

–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

APPLICABLE

FIGURES

3, 10 3.57 2.43 1.2 0.5 0.75

V

, use the figure numbers without parentheses. If the divider is across

(ref)

VO, use the figure numbers in parentheses.

6. T o make the voltage adjustable, the R1/R2 divider shown in the figures must
be replaced by the divider shown below.

FIXED OUTPUT

±5%

R1

(kΩ)R2(kΩ)R1(kΩ)P1(kΩ )P2(kΩ )

OUTPUT ADJUSTABLE

(ref)

±10%

(SEE NOTE 6)

. If the divider is across

R1

P1

R2

Adjustable Output Circuit

7. For Figures 3, 8, and 10, the device requires a minimum of 9 V between V
and V

4

when VO is equal to or more positive than –9 V.

CC–

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CC+

µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

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

VO+

V

(

ref

)

R2

R1)R2

OUTPUTS FROM 7 V TO 37 V

OUTPUTS FROM 4 V TO 250 V

SEE FIGURE 7 AND NOTE 5

VO+
R3+R4

OUTPUTS FROM –6 V TO –250 V

SEE FIGURES 2, 4, (5, 6, 9, 11, 12)

AND NOTE 5

VO+

V

R1)R2

(

)

ref

R2

VO+
R3+R4

NOTES: 5. The R1/R2 divider can be across either VO or V

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 V
–9 V.

V

REF

R1

IN+

C

(ref)

V

CC–

R2

V

(

)

ref

R2–R1

2

R1

SEE FIGURES 3, 8, 10

AND NOTES 5 AND 7

V

(

)

ref

–

. If the divider is across V

(ref)

V

I

CC+

R1)R2

2

V

C

R1

OUTPUT

µA723

V

Z

CURR LIM

CURR SENS

IN–

FREQ COMP

FOLDBACK CURRENT LIMITING

I

(knee)

IOS[

, use figure numbers without parentheses. If the

(ref)

R

CC+

SC

and V

when VO is equal to or more positive than

CC–

Regulated
Output, V

O

R3 (see Notes A and B)

100 pF

CURRENT LIMITING

0.65 V

I

[

(limit)

R

SC

SEE FIGURE 6

V

R3)(R3)R4) 0.65 V

O

[

0.65 V
R

SC

R

SC

R3)R4

R4

R4

NOTES: A.

R1 R2

R3

+

B. R3 can be eliminated for minimum component count. Use direct connection (i.e., R3 = 0).

R1)R2

for a minimum

a

V

O

Figure 1. Basic Low-Voltage Regulator (VO = 2 V to 7 V)

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5

µA723
PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

APPLICATION INFORMATION

V

I

NOTES: A.

B. R3 can be eliminated for minimum component count. Use direct connection (i.e., R3 = 0).

R3

(see Notes A and B)

R1 R2

+

R1)R2

R4 = 3 kΩ

V

CC+

OUTPUT

µA723

CURR LIM

CURR SENS

FREQ COMP

C

V

Z

IN–

100 pF

R

SC

Regulated Output,
V

O

R1

R2

R3

for a minimum

V

REF

IN+

V

CC–

a

V

O

Figure 2. Basic High-Voltage Regulator (VO = 7 V to 37 V)

V

I

2 kΩ

Z

2N5001

Regulated Output,
V

O

R3 =
3 kΩ

R2

R1

REF

IN+

V

CC–

V

CC+

µA723

CURR LIM

CURR SENS

FREQ COMP

V

C

OUTPUT

V

IN–

100 pF

Figure 3. Negative-Voltage Regulator

6

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µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

APPLICATION INFORMATION

V

I

V

C

OUTPUT

µA723

CURR SENS

FREQ COMP

V

CURR LIM

IN–

500 pF

2N3997

Z

R

SC

Regulated Output,
V

O

R1

R2

REF

IN+

V

CC–

V

CC+

Figure 4. Positive-Voltage Regulator (External npn Pass Transistor)

V

I

60 Ω

2N5001

V

C

OUTPUT

µA723

CURR LIM

CURR SENS

FREQ COMP

V

Z

IN–

1000 pF

R

SC

Regulated Output,
V

O

R1

R2

REF

IN+

V

CC–

V

CC+

Figure 5. Positive-Voltage Regulator (External pnp Pass Transistor)

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7