LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 LM79XX Series 3-Terminal Negative Regulators Check for Samples: LM7905, LM7912, LM7915 FEATURES 1 * 2 * * * Thermal, Short Circuit and Safe Area Protection High Ripple Rejection 1.5A Output Current 4% Tolerance on Preset Output Voltage space DESCRIPTION The LM79XX series of 3-terminal regulators is available with fixed output voltages of -5V, -12V, and -15V. These devices need only one external component--a compensation capacitor at the output. The LM79XX series is packaged in the TO-220 power package and is capable of supplying 1.5A of output current. Connection Diagram Figure 1. TO-220 Package Front View See Package Number NDE0003B Typical Applications These regulators employ internal current limiting safe area protection and thermal shutdown for protection against virtually all overload conditions. Low ground pin current of the LM79XX series allows output voltage to be easily boosted above the preset value with a resistor divider. The low quiescent current drain of these devices with a specified maximum change with line and load ensures good regulation in the voltage boosted mode. For applications requiring other voltages, see LM137 datasheet. *Required if regulator is separated from filter capacitor by more than 3. For value given, capacitor must be solid tantalum. 25F aluminum electrolytic may be substituted. Required for stability. For value given, capacitor must be solid tantalum. 25F aluminum electrolytic may be substituted. Values given may be increased without limit. For output capacitance in excess of 100F, a high current diode from input to output (1N4001, etc.) will protect the regulator from momentary input shorts. Figure 2. Fixed Regulator 1 2 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. All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 1999-2013, Texas Instruments Incorporated LM7905, LM7912, LM7915 SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ABSOLUTE MAXIMUM RATINGS (1) Input Voltage (Vo = -5V) -25V (Vo = -12V and -15V) -35V Input-Output Differential (Vo = -5V) 25V (Vo = -12V and -15V) Power Dissipation 30V (2) Internally Limited Operating Junction Temperature Range 0C to +125C -65C to +150C Storage Temperature Range Lead Temperature (Soldering, 10 sec.) (1) (2) 230C Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not ensure Specific Performance limits. For ensured specifications and test conditions, see the Electrical Characteristics. Refer to DESIGN CONSIDERATIONS for details. ELECTRICAL CHARACTERISTICS Conditions unless otherwise noted: IOUT = 500mA, CIN = 2.2F, COUT = 1F, 0C TJ +125C, Power Dissipation 1.5W. Part Number LM7905C Output Voltage -5V -10V Input Voltage (unless otherwise specified) Symbol VO Parameter Output Voltage Conditions Min Typ Max TJ = 25C -4.8 -5.0 -5.2 V 5mA IOUT 1A, -4.75 -5.25 V 50 mV 15 mV P 15W VO Line Regulation Units TJ = 25C, (-20 VIN -7) (1) 8 V (-25 VIN -7) 2 V (-12 VIN -8) VO Load Regulation TJ = 25C, 5mA IOUT 1.5A 15 100 mV 250mA IOUT 750mA 5 50 mV 1 2 mA 0.5 mA 0.5 mA IQ Quiescent Current TJ = 25C IQ Quiescent Current With Line (-25 VIN -7) Change With Load, 5mA IOUT 1A Vn IOMAX V (1) Output Noise Voltage TA = 25C, 10Hz f 100Hz Ripple Rejection f = 120Hz 54 V 125 V 66 dB (-18 VIN -8) V V Dropout Voltage TJ = 25C, IOUT = 1A 1.1 Peak Output Current TJ = 25C 2.2 A Average Temperature IOUT = 5mA, 0.4 mV/C Coefficient of 0 C TJ 100C Output Voltage (1) 2 Regulation is measured at a constant junction temperature by pulse testing with a low duty cycle. Changes in output voltage due to heating effects must be taken into account. Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 ELECTRICAL CHARACTERISTICS Conditions unless otherwise noted: IOUT = 500mA, CIN = 2.2F, COUT = 1F, 0C TJ +125C, Power Dissipation 1.5W. Part Number LM7912C LM7915C Output Voltage -12V -15V Input Voltage (unless otherwise specified) -19V Symbol VO Parameter Output Voltage Conditions VO Line Regulation Load Regulation Typ Max Min Typ Max TJ = 25C -11.5 -12.0 -12.5 -14.4 -15.0 -15.6 V 5mA IOUT 1A, -11.4 -12.6 -14.25 -15.75 V TJ = 25C, (-27 VIN -14.5) (-30 VIN -17.5) V 5 5 mV (1) 100 (-30 VIN -14.5) (-30 VIN -17.5) V 3 3 mV 30 50 (-26 VIN -20) V 5mA IOUT 1.5A 15 200 15 200 mV 250mA IOUT 750mA 5 75 5 75 mV 1.5 3 1.5 3 mA 0.5 mA TJ = 25C, Quiescent Current TJ = 25C IQ Quiescent Current With Line (1) 0.5 (-30 VIN -14.5) Change With Load, 5mA IOUT 1A IOMAX 80 (-22 VIN -16) IQ Vn -23V Min P 15W VO Units Output Noise Voltage TA = 25C, 10Hz f 100Hz Ripple Rejection f = 120 Hz (-30 VIN -17.5) 0.5 0.5 V mA 375 V 70 dB (-25 VIN -15) (-30 VIN -17.5) V V 300 54 70 54 Dropout Voltage TJ = 25C, IOUT = 1A 1.1 1.1 Peak Output Current TJ = 25C 2.2 2.2 A Average Temperature IOUT = 5mA, -0.8 -1.0 mV/C Coefficient of 0 C TJ 100C Output Voltage (1) Regulation is measured at a constant junction temperature by pulse testing with a low duty cycle. Changes in output voltage due to heating effects must be taken into account. Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 Submit Documentation Feedback 3 LM7905, LM7912, LM7915 SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 www.ti.com DESIGN CONSIDERATIONS The LM79XX fixed voltage regulator series has thermal overload protection from excessive power dissipation, internal short circuit protection which limits the circuit's maximum current, and output transistor safe-area compensation for reducing the output current as the voltage across the pass transistor is increased. Although the internal power dissipation is limited, the junction temperature must be kept below the maximum specified temperature (125C) in order to meet data sheet specifications. To calculate the maximum junction temperature or heat sink required, the following thermal resistance values should be used: Package TO-220 Typ Max Typ JC JC JA Max JA C/W C/W C/W C/W 3.0 5.0 60 40 (1) Solving for TJ: TJ = TA + PD (JC + CA) or = TA + PDJA (without heat sink) where * * * * * * * * TJ = Junction Temperature TA = Ambient Temperature PD = Power Dissipation JA = Junction-to-Ambient Thermal Resistance JC = Junction-to-Case Thermal Resistance CA = Case-to-Ambient Thermal Resistance CS = Case-to-Heat Sink Thermal Resistance SA = Heat Sink-to-Ambient Thermal Resistance Typical Applications Bypass capacitors are necessary for stable operation of the LM79XX series of regulators over the input voltage and output current ranges. Output bypass capacitors will improve the transient response by the regulator. The bypass capacitors, (2.2F on the input, 1.0F on the output) should be ceramic or solid tantalum which have good high frequency characteristics. If aluminum electrolytics are used, their values should be 10F or larger. The bypass capacitors should be mounted with the shortest leads, and if possible, directly across the regulator terminals. 4 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 Load and line regulation < 0.01% temperature stability 0.2% Determine Zener current Solid tantalum *Select resistors to set output voltage. 2 ppm/C tracking suggested Figure 3. High Stability 1 Amp Regulator Figure 4. Current Source *Lamp brightness increase until iI= iQ ( 1 mA) + 5V/R1. Necessary only if raw supply filter capacitor is more that 2 from LM7905CT Figure 5. Light Controller Using Silicon Photo Cell Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 Submit Documentation Feedback 5 LM7905, LM7912, LM7915 SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 www.ti.com *Lamp brightness increases until ii = 5V/R1 (Ii can be set as low as 1 A) Necessary only if raw supply filter capacitor is more that 2 from LM7905 Figure 6. High-Sensitivity Light Controller *Improves transient response and ripple rejection. Do not increase beyond 50 F. Select R2 as follows: LM7905CT 300 LM7912CT 750 LM7915CT 1k Figure 7. Variable Output 6 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 (-15) (+15) Load Regulation at IL = 1A 40mV 2mV Output Ripple, CIN = 3000F, IL = 1A 100 Vms 100 Vms Temperature Stability 50mV 50mV Output Noise 10Hz f 10kHz 150 Vms 150 Vms *Resistor tolerance of R4 and R5 determine matching of (+) and (-) outputs. **Necessary only if raw supply filter capacitors are more than 3 from regulators. Figure 8. 15V, 1 Amp Tracking Regulators Figure 9. Dual Trimmed Supply Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 Submit Documentation Feedback 7 LM7905, LM7912, LM7915 SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 www.ti.com Schematic Diagrams Figure 10. -5V Figure 11. -12V and -15V 8 Submit Documentation Feedback Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 LM7905, LM7912, LM7915 www.ti.com SNOSBQ7C - JUNE 1999 - REVISED MAY 2013 REVISION HISTORY Changes from Revision B (May 2013) to Revision C * Page Changed layout of National Data Sheet to TI format. ........................................................................................................... 8 Copyright (c) 1999-2013, Texas Instruments Incorporated Product Folder Links: LM7905 LM7912 LM7915 Submit Documentation Feedback 9 PACKAGE OPTION ADDENDUM www.ti.com 11-Jan-2021 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan (2) Lead finish/ Ball material MSL Peak Temp Op Temp (C) Device Marking (3) (4/5) (6) LM7905CT NRND TO-220 NDE 3 45 Non-RoHS & Green Call TI Call TI 0 to 125 LM7905CT LM7905CT/NOPB ACTIVE TO-220 NDE 3 45 RoHS & Green SN Level-1-NA-UNLIM 0 to 125 LM7905CT LM7912CT NRND TO-220 NDE 3 45 Non-RoHS & Green Call TI Call TI 0 to 125 LM7912CT LM7912CT/NOPB ACTIVE TO-220 NDE 3 45 RoHS & Green SN Level-1-NA-UNLIM 0 to 125 LM7912CT LM7915CT NRND TO-220 NDE 3 45 Non-RoHS & Green Call TI Call TI 0 to 125 LM7915CT LM7915CT/NOPB ACTIVE TO-220 NDE 3 45 RoHS & Green SN Level-1-NA-UNLIM 0 to 125 LM7915CT (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (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. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 11-Jan-2021 (6) Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. 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