Texas Instruments MSP430FW427IPM, MSP430FW423, L123, RC723DB Datasheet

µA723

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 µA723C

description

The µA723 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 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

PLASTIC

DIP

(N)

SMALL

OUTLINE

(D)

CHIP

FORM

(Y)

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.

functional block diagram

–

+

V

CC–

CURR LIM CURR SENS

V

Z

Current
Limiter

V

C

Series Pass
Transistor

Regulated
Output

V

CC+

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)

µA723
PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

schematic

V

CC+

V

C

15 kΩ

OUTPUT

6.2 V
V

Z

FREQ COMP

CURR SENS

CURR LIM

IN–IN+REF

150 Ω

1 kΩ

20 kΩ

300 Ω

5 kΩ

30 kΩ

100 Ω

1 kΩ

25 kΩ

500 Ω

15 kΩ

5 pF

V

CC–

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–

(tw ≤ 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 VZ 25 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

Package thermal impedance, θ

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),

θ

JA

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

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

θ

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.

µA723

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, V

I

9.5 40 V

Output voltage, V

O

2 37 V

Input-to-output voltage differential, VC – V

O

3 38 V

Output current, I

O

150 mA

Operating free-air temperature range, T

A

µA723C 0 70 °C

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

µA723C

PARAMETER

TEST CONDITIONS

T

A

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

pp

f = 50 Hz to 10 kHz, C

ref

= 0 25°C 74

Ripple rejection

f = 50 Hz to 10 kHz, C

ref

= 5 µF 25°C 86

dB

p

25°C –0.3 –2

Output regulation

0°C to 70°C –6

mV/V

Reference voltage, V

ref

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 Ω, VO = 0 25°C 65 mA

p

BW = 100 Hz to 10 kHz, C

ref

= 0 25°C 20

Output noise voltage

BW = 100 Hz to 10 kHz, C

ref

= 5 µF 25°C 2.5

µ

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 kΩ. Unless otherwise specified, VI = V

CC+

= VC = 12 V, V

CC–

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

ref

= 0.

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

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

µA723Y

PARAMETER

TEST CONDITIONS

MIN TYP MAX

UNIT

p

VI = 12 V to VI = 15 V 0.1

Input regulation

VI = 12 V to VI = 40 V 1

mV/V

pp

f = 50 Hz to 10 kHz, C

ref

= 0 74

Ripple rejection

f = 50 Hz to 10 kHz, C

ref

= 5 µF 86

dB

Output regulation –0.3 mV/V
Reference voltage, V

ref

7.15 V
Standby current VI = 30 V, IO = 0 2.3 mA
Short-circuit output current RSC = 10 Ω, VO = 0 65 mA

p

BW = 100 Hz to 10 kHz, C

ref

= 0 20

Output noise voltage

BW = 100 Hz to 10 kHz, C

ref

= 5 µF 2.5

µ

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 kΩ. Unless otherwise specified, VI = V

CC+

= VC = 12 V, V

CC–

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

ref

= 0.

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

µA723
PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

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

OUTPUT

VOLTAGE

APPLICABLE

FIGURES

FIXED OUTPUT

±5%

OUTPUT ADJUSTABLE

±10%

(SEE NOTE 6)

(V) (SEE NOTE 5)

R1

(kΩ)R2(kΩ)R1(kΩ)P1(kΩ )P2(kΩ )

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. T o 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 V

CC+

and V

CC–

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

µA723

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

VO+

V

(

ref

)

R2

R1)R2

VO+

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

VO+

V

(

ref

)

R1)R2

R2

VO+

–

V

(

ref

)

2

R1)R2

R1

R3+R4

I

(knee)

[

V

O

R3)(R3)R4) 0.65 V

R

SC

R4

IOS[

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 V

CC+

and V

CC–

when VO is equal to or more positive than

–9 V.

REF

V

I

V

CC+

V

C

OUTPUT

V

Z

CURR LIM

CURR SENS
IN+
V

CC–

FREQ COMP

IN–

R

SC

R1

C

(ref)

R2

100 pF

Regulated
Output, V

O

R3 (see Notes A and B)

µA723

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 (VO = 2 V to 7 V)

µA723
PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

100 pF

R2

R1

Regulated Output,
V

O

R

SC

V

I

REF

V

CC+

V

C

OUTPUT

V

Z

CURR LIM

CURR SENS

IN+

V

CC–

FREQ COMP

IN–

R3

(see Notes A and B)

µA723

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

R2

V

I

100 pF

2N5001

2 kΩ

R3 =
3 kΩ

R4 = 3 kΩ

R1

REF

V

CC+

V

C

OUTPUT

V

Z

CURR LIM

CURR SENS

IN+

V

CC–

FREQ COMP

IN–

µA723

Regulated Output,
V

O

Figure 3. Negative-Voltage Regulator

µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

APPLICATION INFORMATION

V

I

500 pF

R2

R1

R

SC

2N3997

REF

V

CC+

V

C

OUTPUT

V

Z

CURR LIM

CURR SENS

IN+

V

CC–

FREQ COMP

IN–

µA723

Regulated Output,
V

O

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

R

SC

R1

R2

2N5001

V

I

60 Ω

REF

V

CC+

V

C

OUTPUT

V

Z

CURR LIM

CURR SENS
IN+
V

CC–

FREQ COMP

IN–

µA723

1000 pF

Regulated Output,
V

O

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