LM723/LM723C Voltage Regulator General Description Features The LM723/LM723C is a voltage regulator designed primarily for series regulator applications. By itself, it will supply output currents up to 150 mA; but external transistors can be added to provide any desired load current. The circuit features extremely low standby current drain, and provision is made for either linear or foldback current limiting. The LM723/LM723C is also useful in a wide range of other applications such as a shunt regulator, a current regulator or a temperature controller. The LM723C is identical to the LM723 except that the LM723C has its performance guaranteed over a 0˚C to +70˚C temperature range, instead of −55˚C to +125˚C. n 150 mA output current without external pass transistor n Output currents in excess of 10A possible by adding external transistors n Input voltage 40V max n Output voltage adjustable from 2V to 37V n Can be used as either a linear or a switching regulator Connection Diagrams Dual-In-Line Package Metal Can Package DS008563-3 DS008563-2 Top View Order Number LM723J/883 or LM723CN See NS Package J14A or N14A © 1999 National Semiconductor Corporation DS008563 Note: Pin 5 connected to case. Top View Order Number LM723H, LM723H/883 or LM723CH See NS Package H10C www.national.com LM723/LM723C Voltage Regulator June 1999 Connection Diagrams (Continued) DS008563-20 Top View Order Number LM723E/883 See NS Package E20A Equivalent Circuit* DS008563-4 *Pin numbers refer to metal can package. Typical Application DS008563-8 for minimum temperature drift. Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 3V) 0.5mV 5V Load Regulation (∆IL = 50 mA) 1.5mV FIGURE 1. Basic Low Voltage Regulator (VOUT = 2 to 7 Volts) www.national.com 2 Absolute Maximum Ratings (Note 1) Cavity DIP (Note 2) 900 mW Molded DIP (Note 2) 660 mW Operating Temperature Range LM723 −55˚C to +150˚C LM723C 0˚C to +70˚C Storage Temperature Range Metal Can −65˚C to +150˚C Molded DIP −55˚C to +150˚C Lead Temperature (Soldering, 4 sec. max.) Hermetic Package 300˚C Plastic Package 260˚C ESD Tolerance 1200V (Human body model, 1.5 kΩ in series with 100 pF) If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 10) Pulse Voltage from V+ to V− (50 ms) Continuous Voltage from V+ to V− Input-Output Voltage Differential Maximum Amplifier Input Voltage (Either Input) Maximum Amplifier Input Voltage (Differential) Current from VZ Current from VREF Internal Power Dissipation Metal Can (Note 2) 50V 40V 40V 8.5V 5V 25 mA 15 mA 800 mW Electrical Characteristics (Note 3) (Note 10) Parameter Conditions LM723 Min Line Regulation VIN = 12V to VIN = 15V Typ 0.01 −55˚C ≤ TA ≤ +125˚C Load Regulation 0˚C ≤ TA ≤ +70˚C VIN = 12V to VIN = 40V IL = 1 mA to IL = 50 mA −55˚C ≤ TA ≤ +125˚C ient of Output Voltage (Note 8) 0˚C ≤ TA ≤ +70˚C RSC = 10Ω, VOUT = 0 Short Circuit Current Limit 0.01 0.1 % VOUT % VOUT 0.3 % VOUT 0.02 0.2 0.1 0.5 % VOUT 0.03 0.15 0.03 0.2 % VOUT % VOUT % VOUT 0.6 74 74 dB 86 86 dB %/˚C 0.003 0.015 65 6.95 7.15 BW = 100 Hz to 10 kHz, CREF = 0 BW = 100 Hz to 10 kHz, CREF = 5 µF 65 7.35 6.80 7.15 86 Long Term Stability Standby Current Drain 0.1 0.002 0.015 Reference Voltage Output Noise Voltage Max 0.6 0˚C ≤ TA ≤ +70˚C f = 50 Hz to 10 kHz, CREF = 0 f = 50 Hz to 10 kHz, CREF = 5 µF Average Temperature Coeffic- Units Typ 0.3 −55˚C ≤ TA ≤ +125˚C Ripple Rejection LM723C Max Min IL = 0, VIN = 30V %/˚C mA 7.50 86 V µVrms 2.5 2.5 µVrms 0.05 0.05 %/1000 hrs 4.0 mA Input Voltage Range 9.5 1.7 3.5 40 9.5 1.7 40 V Output Voltage Range 2.0 37 2.0 37 V Input-Output Voltage Differential 3.0 38 3.0 38 V θJA Molded DIP θJA Cavity DIP 150 θJA H10C Board Mount in Still Air 165 165 ˚C/W θJA H10C Board Mount in 400 LF/Min Air Flow 66 66 ˚C/W 22 22 ˚C/W 105 θJC ˚C/W ˚C/W Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. Note 2: See derating curves for maximum power rating above 25˚C. Note 3: Unless otherwise specified, TA = 25˚C, VIN = V+ = VC = 12V, V− = 0, VOUT = 5V, IL = 1 mA, RSC = 0, C1 = 100 pF, CREF = 0 and divider impedance as seen by error amplifier ≤ 10 kΩ connected as shown in Figure 1. Line and load regulation specifications are given for the condition of constant chip temperature. Temperature drifts must be taken into account separately for high dissipation conditions. Note 4: L1 is 40 turns of No. 20 enameled copper wire wound on Ferroxcube P36/22-3B7 pot core or equivalent with 0.009 in. air gap. Note 5: Figures in parentheses may be used if R1/R2 divider is placed on opposite input of error amp. Note 6: Replace R1/R2 in figures with divider shown in Figure 13. Note 7: V+ and VCC must be connected to a +3V or greater supply. Note 8: For metal can applications where VZ is required, an external 6.2V zener diode should be connected in series with VOUT. 3 www.national.com Electrical Characteristics (Note 3) (Note 10) (Continued) Note 9: Guaranteed by correlation to other tests. Note 10: A military RETS specification is available on request. At the time of printing, the LM723 RETS specification complied with the Min and Max limits in this table. The LM723E, H, and J may also be procured as a Standard Military Drawing. Typical Performance Characteristics Load Regulation Characteristics with Current Limiting Load Regulation Characteristics with Current Limiting DS008563-22 Current Limiting Characteristics Load & Line Regulation vs Input-Output Voltage Differential DS008563-23 Current Limiting Characteristics vs Junction Temperature DS008563-24 Standby Current Drain vs Input Voltage DS008563-25 DS008563-27 DS008563-26 Line Transient Response Load Transient Response DS008563-28 Output Impedence vs Frequency DS008563-29 DS008563-30 www.national.com 4 Maximum Power Ratings Noise vs Filter Capacitor (CREF in Circuit of Figure 1) (Bandwidth 100 Hz to 10 kHz) LM723 Power Dissipation vs Ambient Temperature DS008563-31 LM723C Power Dissipation vs Ambient Temperature DS008563-32 DS008563-33 TABLE 1. Resistor Values (kΩ) for Standard Output Voltage Positive Applicable Fixed Output Negative Output Figures Output Adjustable Output Applicable ± 10% (Note 6) Voltage Figures ± 5% Voltage (Note 5) R1 R2 R1 P1 R2 +3.0 1, 5, 6, 9, 12 (4) 4.12 3.01 1.8 0.5 1.2 +100 +3.6 1, 5, 6, 9, 12 (4) 3.57 3.65 1.5 0.5 1.5 +5.0 1, 5, 6, 9, 12 (4) 2.15 4.99 0.75 0.5 +6.0 1, 5, 6, 9, 12 (4) 1.15 6.04 0.5 0.5 +9.0 2, 4, (5, 6, 9, 12) 1.87 7.15 0.75 1.0 +12 2, 4, (5, 6, 9, 12) 4.87 7.15 2.0 +15 2, 4, (5, 6, 9, 12) 7.87 7.15 +28 2, 4, (5, 6, 9, 12) 21.0 7.15 +45 7 3.57 +75 7 3.57 Fixed 5% Output Output Adjustable ± 5% ± 10% R1 R2 R1 P1 7 3.57 102 2.2 10 R2 91 +250 7 3.57 255 2.2 10 240 2.2 −6 (Note 7) 3, (10) 3.57 2.43 1.2 0.5 0.75 2.7 −9 3, 10 3.48 5.36 1.2 0.5 2.0 2.7 −12 3, 10 3.57 8.45 1.2 0.5 3.3 1.0 3.0 −15 3, 10 3.65 11.5 1.2 0.5 4.3 3.3 1.0 3.0 −28 3, 10 3.57 24.3 1.2 0.5 10 5.6 1.0 2.0 −45 8 3.57 41.2 2.2 10 33 48.7 2.2 10 39 −100 8 3.57 97.6 2.2 10 91 78.7 2.2 10 68 −250 8 3.57 249 2.2 10 240 TABLE 2. Formulae for Intermediate Output Voltages Outputs from +2 to +7 volts Outputs from +4 to +250 volts (Figures 1, 4, 5, 6, 9, 12 (Figure 7) Outputs from +7 to +37 volts Outputs from −6 to −250 volts (Figures 2, 4, 5, 6, 9, 12) (Figures 3, 8, 10) 5 Current Limiting Foldback Current Limiting www.national.com Typical Applications DS008563-11 Typical Performance DS008563-9 for minimum temperature drift. R3 may be eliminated for minimum component count. 1.5 mV +15V Load Regulation (∆IL = 1A) 15 mV FIGURE 4. Positive Voltage Regulator (External NPN Pass Transistor) Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 3V) 15V Load Regulation (∆IL = 50 mA) 4.5 mV 1.5 mV FIGURE 2. Basic High Voltage Regulator (VOUT = 7 to 37 Volts) DS008563-10 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 3V) 1 mV Load Regulation (∆IL = 100 mA) 2 mV −15V FIGURE 3. Negative Voltage Regulator www.national.com Regulated Output Voltage Line Regulation (∆VIN = 3V) 6 Typical Applications (Continued) DS008563-12 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 3V) Load Regulation (∆IL = 1A) +5V 0.5 mV 5 mV FIGURE 5. Positive Voltage Regulator (External PNP Pass Transistor) DS008563-13 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 3V) Load Regulation (∆IL = 10 mA) Short Circuit Current +5V 0.5 mV 1 mV 20 mA FIGURE 6. Foldback Current Limiting 7 www.national.com Typical Applications (Continued) DS008563-14 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 20V) 15 mV +50V Load Regulation (∆IL = 50 mA) 20 mV FIGURE 7. Positive Floating Regulator DS008563-15 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 20V) 30 mV −100V Load Regulation (∆IL = 100 mA) 20 mV FIGURE 8. Negative Floating Regulator www.national.com 8 Typical Applications (Continued) DS008563-16 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 30V) 10 mV +5V Load Regulation (∆IL = 2A) 80 mV FIGURE 9. Positive Switching Regulator DS008563-17 Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 20V) 8 mV −15V Load Regulation (∆IL = 2A) 6 mV FIGURE 10. Negative Switching Regulator 9 www.national.com Typical Applications (Continued) DS008563-18 Note: Current limit transistor may be used for shutdown if current limiting is not required. Typical Performance Regulated Output Voltage Line Regulation (∆VIN = 3V) 0.5 mV +5V Load Regulation (∆IL = 50 mA) 1.5 mV FIGURE 11. Remote Shutdown Regulator with Current Limiting DS008563-19 Regulated Output Voltage Line Regulation (∆VIN = 10V) 0.5 mV Load Regulation (∆IL = 100 mA) 1.5 mV FIGURE 12. Shunt Regulator www.national.com 10 +5V Typical Applications (Continued) DS008563-21 FIGURE 13. Output Voltage Adjust (Note 6) Schematic Diagram DS008563-1 11 www.national.com Physical Dimensions inches (millimeters) unless otherwise noted Leadless Chip Carrier Package (E) Order Number LM723E/883 NS Package E20A Metal Can Package (H) Order Number LM723H, LM723H/883 or LM723CH NS Package H10C www.national.com 12 Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Ceramic Dual-In-Line Package (J) Order Number LM723J/883 NS Package J14A 13 www.national.com LM723/LM723C Voltage Regulator Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Molded Dual-In-Line Package (N) Order Number LM723CN NS Package N14A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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