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Power management
1.5-A, 35-V, linear voltage regulator
Data sheet
- document-pdfAcrobat LM340, LM340A and LM7805 Family Wide VIN 1.5-A Fixed Voltage Regulators datasheet (Rev. L) PDF | HTML
LM340
Product details
- 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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View all 19Type | 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 | 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 | Download |
---|---|---|
SOT-223 (DCY) | 4 | View options |
TO-220 (NDE) | 3 | View options |
TO-220 (NDG) | 3 | View options |
TO-263 (KTT) | 3 | View options |
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