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Linear & low-dropout (LDO) regulators

LM340

ACTIVE

1.5-A, 35-V, linear voltage regulator

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Data sheet

LM340

ACTIVE
Data sheet Order now

Product details

Output options Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 35 Vin (min) (V) 7.5 Vout (max) (V) 15 Vout (min) (V) 5 Fixed output options (V) 5, 12, 15 Rating Catalog Noise (µVrms) 40 PSRR at 100 KHz (dB) 50 Iq (typ) (mA) 8 Thermal resistance θJA (°C/W) 24 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 2.5 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
Output options Fixed Output Iout (max) (A) 1.5 Vin (max) (V) 35 Vin (min) (V) 7.5 Vout (max) (V) 15 Vout (min) (V) 5 Fixed output options (V) 5, 12, 15 Rating Catalog Noise (µVrms) 40 PSRR at 100 KHz (dB) 50 Iq (typ) (mA) 8 Thermal resistance θJA (°C/W) 24 Load capacitance (min) (µF) 0 Regulated outputs (#) 1 Accuracy (%) 2.5 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) 0 to 125
SOT-223 (DCY) 4 45.5 mm² 6.5 x 7 TO-220 (NDE) 3 46.5328 mm² 10.16 x 4.58 TO-220 (NDG) 3 193.548 mm² 10.16 x 19.05 TO-263 (KTT) 3 154.8384 mm² 10.16 x 15.24
  • Output Current up to 1.5 A
  • Available in Fixed 5-V, 12-V, and 15-V Options
  • Output Voltage Tolerances of ±2% at TJ = 25°C (LM340A)
  • Line Regulation of 0.01% / V of at 1-A Load (LM340A)
  • Load Regulation of 0.3% / A (LM340A)
  • Internal Thermal Overload, Short-Circuit and SOA Protection
  • Available in Space-Saving SOT-223 Package
  • Output Capacitance Not Required for Stability
  • Output Current up to 1.5 A
  • Available in Fixed 5-V, 12-V, and 15-V Options
  • Output Voltage Tolerances of ±2% at TJ = 25°C (LM340A)
  • Line Regulation of 0.01% / V of at 1-A Load (LM340A)
  • Load Regulation of 0.3% / A (LM340A)
  • Internal Thermal Overload, Short-Circuit and SOA Protection
  • Available in Space-Saving SOT-223 Package
  • Output Capacitance Not Required for Stability

The LM340 and LM7805 Family monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they can deliver over 1.5-A output current. They are intended as fixed voltage regulators in a wide range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation. In addition to use as fixed voltage regulators, these devices can be used with external components to obtain adjustable output voltages and currents.

Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply.

LM7805 is also available in a higher accuracy and better performance version (LM340A). Refer to LM340A specifications in the LM340A Electrical Characterisitcs table.

The LM340 and LM7805 Family monolithic 3-terminal positive voltage regulators employ internal current-limiting, thermal shutdown and safe-area compensation, making them essentially indestructible. If adequate heat sinking is provided, they can deliver over 1.5-A output current. They are intended as fixed voltage regulators in a wide range of applications including local (on-card) regulation for elimination of noise and distribution problems associated with single-point regulation. In addition to use as fixed voltage regulators, these devices can be used with external components to obtain adjustable output voltages and currents.

Considerable effort was expended to make the entire series of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter capacitor of the power supply.

LM7805 is also available in a higher accuracy and better performance version (LM340A). Refer to LM340A specifications in the LM340A Electrical Characterisitcs table.

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Technical documentation

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Type Title Date
* Data sheet LM340, LM340A and LM7805 Family Wide VIN 1.5-A Fixed Voltage Regulators datasheet (Rev. L) PDF | HTML 29 Sep 2016
Application note A Topical Index of TI LDO Application Notes (Rev. F) 27 Jun 2019
Selection guide Low Dropout Regulators Quick Reference Guide (Rev. P) 21 Mar 2018
Analog Design Journal Industrial-strength design considerations to prevent thermal and EMI damage 11 Apr 2014
Application note AB-12 Wide Adjustable Range PNP Voltage Regulator (Rev. B) 06 May 2013
Application note AN-1028 Maximum Power Enhancement Techniques for Power Packages (Rev. B) 06 May 2013
Application note AN-103 LM340 Series Three Terminal Positive Regulators (Rev. A) 06 May 2013
Application note AN-1148 Linear Regulators: Theory of Operation and Compensation (Rev. B) 06 May 2013
Application note AN-256 Circuitry for Inexpensive Relative Humidity Measurement (Rev. B) 06 May 2013
Application note AN-298 Isolation Techniques for Signal Conditioning (Rev. B) 06 May 2013
Application note AN-182 Improving Power Supply Reliability with IC Power Regulators (Rev. B) 05 May 2013
Application note Method For Cal Output Voltage Tolerances in Adj Regs (Rev. A) 05 May 2013
Application note Super Matched Bipolar Transistor Pair Sets New Standards for Drift and Noise (Rev. B) 05 May 2013
More literature Die D/S LM7808C MDC Series 3-Terminal Positive Regulators 28 Sep 2012
More literature Die D/S LM6172 MDC Dual Hi Spd, Low Pwr, Low Distortion Voltage Feedback Amp 27 Sep 2012
Application note Packaging Limits Range of Linear Regulators 08 May 2010
Application note Digital Designer's Guide to Linear Voltage Regulators & Thermal Mgmt (LDO) (Rev. A) 04 Jun 2008
User guide A User's Guide to Compensating Low-Dropout Regulators 21 Mar 2007
Application note Understanding the Terms and Definitions of LDO Voltage Regulators 21 Oct 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins CAD symbols, footprints & 3D models
SOT-223 (DCY) 4 Ultra Librarian
TO-220 (NDE) 3 Ultra Librarian
TO-220 (NDG) 3 Ultra Librarian
TO-263 (KTT) 3 Ultra Librarian
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