Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsVoltage RegulatorsLM723CN

November 2007 Rev 6 1/21

LM723

High precision voltage regulator

Features

■ Input voltage up to 40 V

■ Output voltage adjustable from 2 to 37 V

■ Positive or negative supply operation

■ Series, shunt, switching or floating operation

■ Output current to 150 mA without external pass

transistor

■ Adjustable current limiting

Description

The LM723 is a monolithic integrated

programmable voltage regulator, assembled in

14-lead dual in-line plastic package. The circuit

provides internal current limiting. When the output

current exceeds 150 mA an external NPN or PNP

pass element may be used. Provisions are made

for adjustable current limiting and remote shut-

down.

DIP-14

Table 1. Device summary

Order code Package

LM723N DIP-14

LM723CN DIP-14

www.st.com

Summary of content (21 pages)

PAGE 1
LM723 High precision voltage regulator Features ■ Input voltage up to 40 V ■ Output voltage adjustable from 2 to 37 V ■ Positive or negative supply operation ■ Series, shunt, switching or floating operation ■ Output current to 150 mA without external pass transistor ■ DIP-14 Adjustable current limiting Description The LM723 is a monolithic integrated programmable voltage regulator, assembled in 14-lead dual in-line plastic package. The circuit provides internal current limiting.
PAGE 2
Contents LM723 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PAGE 3
LM723 Diagram 1 Diagram Figure 1.
PAGE 4
Pin configuration 2 Pin configuration Figure 2.
PAGE 5
LM723 Maximum ratings 3 Maximum ratings Table 2. Absolute maximum ratings Value Symbol Parameter Unit LM723 LM723C VI DC input voltage 40 40 V ΔVI-O Dropout voltage 40 40 V Output current 150 150 mA IREF Current from VREF 15 25 mA TOP Operating Temperature -55 to 125 0 to 70 °C TSTG Storage Temperature -65 to 150 -65 to 150 °C TJ Junction Temperature 150 125 °C IO Table 3.
PAGE 6
Circuit LM723 4 Circuit Figure 3.
PAGE 7
LM723 Electrical characteristics 5 Electrical characteristics Table 4. Electrical characteristics for LM723 (refer to the test circuits, TA = 25 °C, unless otherwise specified.) Symbol Parameter ΔVO/ΔVI Line regulation Test conditions Min. Typ. Max. VI = 12 to 15 V 0.01 0.1 VI = 12 to 40 V 0.02 0.2 VI = 12 to 15 V, TA = -55 to 125°C ΔVO/VO Load regulation 0.
PAGE 8
Electrical characteristics Table 5. Symbol LM723 Electrical characteristics for LM723C (refer to the test circuits, TA = 25 °C, unless otherwise specified.) Parameter ΔVO/ΔVI Line regulation Test conditions Min. Typ. Max. VI = 12 to 15 V 0.01 0.1 VI = 12 to 40 V 0.1 0.5 VI = 12 to 15 V, TA = 0 to 70°C ΔVO/VO Load regulation 0.
PAGE 9
LM723 Typical performance characteristics 6 Typical performance characteristics Figure 4. (unless otherwise specified VO(NOM) = 3.3 V) Maximum output current vs voltage Figure 5. drop Current limiting characteristics Figure 6. Current limiting characteristics vs junction temperature Figure 7. Load regulation characteristics without current limiting Figure 8. Load regulation characteristics with current limiting Figure 9.
PAGE 10
Typical performance characteristics LM723 Figure 10. Line regulation vs voltage drop Figure 11. Load regulation vs voltage drop Figure 12. Quiescent drain current vs input voltage Figure 13. Line transient response Figure 14. Load transient response Figure 15.
PAGE 11
LM723 Table 6. Typical performance characteristics Resistor values (kΩ) for standard output voltages Fixed output ± 5% Output Voltage Applicable figures +3 Output adjustable ± 10% (1) R1 R2 R1 P1 R2 16, 18, 20, 21, 24, 26 4.12 3.01 1.8 0.5 1.2 +5 16, 18, 20, 21, 24, 26 2.15 4.99 0.75 0.5 2.2 +6 16, 18, 20, 21, 24, 26 1.15 6.04 0.5 0.5 2.7 +9 17, 18, 20, 21, 24, 26 1.87 7.15 0.75 1 2.7 +12 17, 18, 20, 21, 24, 26 4.87 7.15 2 1 3 +15 17, 18, 20, 21, 24, 26 7.
PAGE 12
Applications information 7 Applications information Figure 16. Basic low voltage regulator (VO = 2 to 7 V) Note: R3 = (R1xR2)/(R1+R2) for minimum temperature drift. R3 may be eliminated for minimum component count. Typical performance Regulated output voltage..................5 V Line regulation (Δ VI = 3 V)..........0.5 mV Load regulation (Δ IO = 50 mA)...1.5 mV Figure 17. Basic high voltage regulator (VO = 7 to 37 V) Note: R3 = (R1xR2)/(R1+R2) for minimum temperature drift.
PAGE 13
LM723 Applications information Figure 18. Negative voltage regulator Note: Typical performance Regulated output voltage.................15 V Line regulation (Δ VI = 3 V)...............1 mV Load regulation (Δ IO = 100 mA)......2 mV Figure 19. Positive voltage regulator (external NPN pass transistor) Note: Typical performance Regulated output voltage................15 V Line regulation (Δ VI = 3 V)...........1.5 mV Load regulation (Δ IO = 1 A)...........
PAGE 14
Applications information Figure 20. Positive voltage regulator (external PNP pass transistor) Note: Typical performance Regulated output voltage...................5 V Line regulation (Δ VI = 3 V)...........0.5 mV Load regulation (Δ IO = 1 A)..........1.5 mV Figure 21. Foldback current limiting Note: Typical performance Regulated output voltage....................5 V Line regulation (Δ VI = 3 V)............0.5 mV Load regulation (Δ IO = 10 mA)........1 mV Current limit knee...........................
PAGE 15
LM723 Applications information Figure 22. Positive floating regulator Note: Typical performance Regulated output voltage....................100 V Line regulation (Δ VI = 20 V)...............15 mV Load regulation (Δ IO = 50 mA)..........20 mV Figure 23. Negative floating regulator Note: Typical performance Regulated output voltage....................-100 V Line regulation (Δ VI = 20 V).................30 mV Load regulation (Δ IO = 100 mA)..........
PAGE 16
Applications information Figure 24. Positive switching regulator Note: Typical performance Regulated output voltage....................5 V Line regulation (Δ VI = 30 V)...........10 mV Load regulation (Δ IO = 2 A)............80 mV Figure 25. Remote shutdown regulator with current limiting Note: Current limit transistor may be used for shutdown if current limiting is not required. Typical performance Regulated output voltage...........................5 V Line regulation (Δ VI = 3 V)...................
PAGE 17
LM723 Applications information Figure 26. Shunt regulator Note: Typical performance Regulated output voltage............................5 V Line regulation (Δ VI = 10 V).....................2 mV Load regulation (Δ IO = 100 mA)..............5 mV Figure 27.
PAGE 18
Package mechanical data 8 LM723 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.
PAGE 19
LM723 Package mechanical data Plastic DIP-14 mechanical data mm. inch. Dim. Min. a1 0.51 B 1.39 Typ. Max. Min. Typ. Max. 0.020 1.65 0.055 0.065 b 0.5 0.020 b1 0.25 0.010 D 20 0.787 E 8.5 0.335 e 2.54 0.100 e3 15.24 0.600 F 7.1 0.280 I 5.1 0.201 L Z 3.3 1.27 0.130 2.54 0.050 0.
PAGE 20
Revision history LM723 9 Revision history Table 8. Document revision history Date Revision 21-Jun-2004 5 22-Nov-2007 6 20/21 Changes Added Table 1.
PAGE 21
LM723 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.