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µA723

PRECISION VOLTAGE REGULATORS

SLVS057D – AUGUST 1972 – REVISED JULY 1999

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

150-mA Load Current Without External

Power Transistor

Adjustable Current-Limiting Capability

Input Voltages up to 40 V

Output Adjustable From 2 V to 37 V

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

CHIP

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

–

CC–

CURR LIM CURR SENS

Current

Limiter

Series Pass

Transistor

Regulated

Output

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.

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.

CURR LIM

CURR SENS

IN–

IN+

REF

CC–

FREQ COMP

CC+

OUTPUT

D OR N PACKAGE

(TOP VIEW)

Summary of content (21 pages)

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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 D D D D D D OR N PACKAGE (TOP VIEW) 150-mA Load Current Without External Power Transistor Adjustable Current-Limiting Capability Input Voltages up to 40 V Output Adjustable From 2 V to 37 V Direct Replacement for Fairchild µA723C NC CURR LIM CURR SENS IN– IN+ REF VCC– description 1 14 2 13 3 12 4 11 5 10 6 9 7 8 NC FREQ COMP VCC+ VC OUTPUT VZ NC The µA723 is a precision integrated-circuit voltage regulator, fe
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 schematic VCC+ 500 Ω 1 kΩ 25 kΩ VC 1 kΩ 15 kΩ 15 kΩ OUTPUT 6.2 V 100 Ω VZ 5 pF 30 kΩ FREQ COMP 300 Ω 5 kΩ 150 Ω 20 kΩ CURR LIM CURR SENS REF IN+ VCC– IN– Resistor and capacitor values shown are nominal. absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Peak voltage from VCC+ to VCC– (tw ≤ 50 ms) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 recommended operating conditions MIN MAX 9.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION Table 1. Resistor Values (kΩ) for Standard Output Voltages OUTPUT VOLTAGE (V) APPLICABLE FIGURES (SEE NOTE 5) 3.0 3.6 FIXED OUTPUT ±5% OUTPUT ADJUSTABLE ±10% (SEE NOTE 6) R1 (kΩ) R2 (kΩ) R1 (kΩ) P1 (kΩ ) P2 (kΩ ) 1, 5, 6, 9, 11, 12 (4) 4.12 3.01 1.8 0.5 1.2 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.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION Table 2.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION VI VCC+ VC OUTPUT µA723 REF VZ CURR LIM R3 (see Notes A and B) RSC Regulated Output, VO CURR SENS IN+ IN– FREQ COMP VCC– R1 R2 100 pF NOTES: A. R3 R2 + R1 R1 ) R2 for a minimum aV O B. R3 can be eliminated for minimum component count. Use direct connection (i.e., R3 = 0). Figure 2.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION VI VC VCC+ OUTPUT µA723 VZ CURR LIM REF 2N3997 CURR SENS RSC IN+ IN– VCC– FREQ COMP Regulated Output, VO R1 500 pF R2 Figure 4. Positive-Voltage Regulator (External npn Pass Transistor) VI 60 Ω 2N5001 VCC+ OUTPUT µA723 VZ CURR LIM REF R1 RSC CURR SENS IN+ VCC– R2 VC Regulated Output, VO IN– FREQ COMP 1000 pF Figure 5.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION VI VCC+ R1 VC RSC OUTPUT µA723 REF VZ CURR LIM R3 CURR SENS R4 IN+ IN– VCC– FREQ COMP Regulated Output, VO IOS VO lknee IO R2 1000 pF Figure 6. Foldback Current Limiting VI 2 kΩ VCC+ 1N1826 R4 = 3 kΩ R3 = 3 kΩ VC 2N2580 OUTPUT µA723 REF VZ CURR LIM R1 CURR SENS IN+ IN– R2 VCC– FREQ COMP RSC = 1 Ω 500 pF Figure 7.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION VI 10 kΩ VCC+ 1N759 R2 R3 = 3 kΩ VC 10 kΩ OUTPUT µA723 REF VZ CURR LIM 2N5287 CURR SENS IN+ IN– VCC– FREQ COMP R1 R4 = 3 kΩ 500 pF Regulated Output, VO Figure 8. Negative Floating Regulator VI 3 kΩ 2N5153 2N5005 VCC+ REF R1 IN+ R2 OUTPUT µA723 VZ CURR LIM L = 1.2 mH (see Note A) 51 Ω CURR SENS 1 kΩ 0.
PAGE 10
µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION VI 1 kΩ (see Note A) R3 = 3 kΩ VCC+ R2 0.1 µF REF 2N3997 220 Ω VC OUTPUT µA723 VZ CURR LIM 2N5004 CURR SENS 1 kΩ IN+ R1 IN– FREQ COMP VCC– 1 MΩ 15 pF R4 = 3 kΩ L = 1.2 mH (see Note B) 1N4005 100 µF Regulated Output, VO NOTES: A. The device requires a minimum of 9 V between VCC+ and VCC– when VO is equal to or more positive than –9 V. B. L is 40 turns of No.
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µA723 PRECISION VOLTAGE REGULATORS SLVS057D – AUGUST 1972 – REVISED JULY 1999 APPLICATION INFORMATION VI VCC+ REF R1 IN+ 100 Ω VC OUTPUT µA723 VZ CURR LIM 1 kΩ 2N3997 CURR SENS Regulated Output, VO IN– VCC– FREQ COMP R2 5000 pF Figure 12.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 10-Jun-2014 (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant UA723CDR SOIC D 14 2500 330.0 16.4 6.5 9.0 2.1 8.0 16.0 Q1 UA723CNSR SO NS 14 2000 330.0 16.4 8.2 10.5 2.5 12.0 16.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) UA723CDR UA723CNSR SOIC D 14 2500 367.0 367.0 38.0 SO NS 14 2000 367.0 367.0 38.
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