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. 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 shutdown. Table 1. Device summary November 2007 Order code Package LM723N DIP-14 LM723CN DIP-14 Rev 6 1/21 www.st.com 21 Contents LM723 Contents 1 Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 4 Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 5 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 6 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 7 Applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 9 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 2/21 LM723 Diagram 1 Diagram Figure 1. Schematic diagram 3/21 Pin configuration 2 Pin configuration Figure 2. Pin connections (top view) 4/21 LM723 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. Symbol RthJA Thermal data Parameter Thermal resistance junction-ambient Max DIP14 Unit 200 °C/W 5/21 Circuit LM723 4 Circuit Figure 3. Test circuit (pin configuration relative to the plastic package) Note: VI = 12 V; VO = 5 V; IO = 1 mA; R1/R2 ≤10 kΩ 6/21 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 0.03 SVR Supply voltage rejection f = 100 Hz to 10kHz ΔVO/ΔT Output voltage drift ISC Output current limit VI Input voltage range VO Output voltage range IREF = 160 µA Quiescent current KVH Long term stability eN Output noise voltage 0.6 6.95 7.15 CREF = 0 74 CREF = 5µF 86 7.35 RSC = 10Ω, VO = 0 V 65 VI = 30V, IO = 0 mA ppm/°C mA 9.5 40 V 2 37 V 3 38 V 5 mA 2.3 0.1 BW = 100 Hz to 10 kHz V dB 150 VO-VI Id 0.15 % IO = 1 to 10 mA, TA = -55 to 125°C Reference voltage % 0.3 IO = 1 to 50 mA VREF Unit CREF = 0 20 CREF = 5µF 2.5 %/1000 hrs µV 7/21 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 0.03 SVR Supply voltage rejection f = 100 Hz to 10kHz ΔVO/ΔT Output voltage drift ISC Output current limit VI Input voltage range VO Output voltage range IREF = 160 µA Quiescent current KVH Long term stability eN Output noise voltage 8/21 0.6 6.8 7.15 CREF = 0 74 CREF = 5µF 86 7.5 RSC = 10Ω, VO = 0 V 65 VI = 30V, IO = 0 mA ppm/°C mA 9.5 40 V 2 37 V 3 38 V 4 mA 2.3 0.1 BW = 100 Hz to 10 kHz V dB 150 VO-VI Id 0.2 % IO = 1 to 10 mA, TA = 0 to 70°C Reference voltage % 0.3 IO = 1 to 50 mA VREF Unit CREF = 0 20 CREF = 5µF 2.5 %/1000 hrs µV 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. Load regulation characteristics with current limiting 9/21 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. Output impedance vs frequency 10/21 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 7.87 7.15 3.3 1 3 +28 17, 18, 20, 21, 24, 26 21 7.15 5.6 1 2 +45 22 3.57 48.7 2.2 10 39 +75 22 3.57 78.7 2.2 10 68 +100 22 3.57 102 2.2 10 91 +250 22 3.57 255 2.2 10 240 -6 (2) 18 3.57 2.43 1.2 0.5 0.75 -9 18 3.48 5.36 1.2 0.5 2 -12 18 3.57 8.45 1.2 0.5 3.3 -15 18 3.65 11.5 1.2 0.5 4.3 -28 18 3.57 24.3 1.2 0.5 10 -45 23 3.57 21.2 2.2 10 33 -100 23 3.57 97.6 2.2 10 91 -250 23 3.57 249 2.2 10 240 1. Replace R1/R2 divider with the circuit of Figure 27. 2. V+ must be connected to a +3 V or greater supply. Table 7. Formula for intermediate output voltages Conditions Outputs from 4 to 250V Outputs from 2 to 7V Figure 22 Figure 16, 19, 20, 21, 24, 26 VO=(VREF/2)x[ (R2-R1)/R1] ; R3=R4 VO=(VREFxR2) /(R1+R2) Outputs from 7 to 37V Figure 17, 19, 20, 21, 24, 26 VO=VREFx[ (R1+R2)/R2] Outputs from -6 to -250V Figure 18, Figure 23 VO=(VREF/2)x[ (R1+R2)/R1] ; R3=R4 Current Limit ILIMIT=VSENSE/RSC Foldback Current Limiting IKNEE=[ (VOxR3)/(RSCxR4)] x[ VSENSEx(R3+R4)] / (RSCxR4) ISHORTCKT=(VSENSE/RSC)x[ (R3+R4)/R4] 11/21 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. R3 may be eliminated for minimum component count. Typical performance Regulated output voltage..................15 V Line regulation (Δ VI = 3 V)............1.5 mV Load regulation (Δ IO = 50 mA).....4.5 mV 12/21 LM723 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)...........15 mV 13/21 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...........................20 mA 14/21 LM723 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)..........20 mV 15/21 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)...................0.5 mV Load regulation (Δ IO = 50 mA)............1.5 mV 16/21 LM723 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. Output voltage adjust 17/21 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.st.com. 18/21 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 0.100 P001A 19/21 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. 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. 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