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LM317G
+BOMIC REG LIN POS ADJ 1.5A SOT-223
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ManufacturerUMW
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Mfr. Part #LM317G
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Datasheet LM317G DataSheet
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In Stock7933
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Specifications
| Attribute | Value |
| Part Status | Active |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 40V |
| Voltage - Output (Min / Fixed) | 1.2V |
| Voltage - Output (Max) | 37V |
| Current - Output | 1.5A |
| Current - Quiescent (Iq) | 12 mA |
| PSRR | 75dB ~ 60dB (120Hz) |
| Protection Features | Over Current, Over Temperature, Short Circuit |
| Operating Temperature | 0°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | TO-261-4, TO-261AA |
| Supplier Device Package | SOT-223 |
Overview
Description
The LM317G is a versatile, adjustable three-terminal voltage regulator used in a variety of electronic applications. It allows for output voltage adjustments ranging from 1.25V to 37V with a current capacity of up to 1.5A, making it suitable for powering devices with different voltage requirements. The device is known for its ease of use, requiring only two external resistors to set the output voltage. Additionally, the LM317G features internal current limiting, thermal overload protection, and safe area compensation, enhancing its reliability and safety in diverse environments. This regulator is often employed in power supply circuits, battery chargers, and other electronic devices where stable and adjustable voltage is essential. Its compact size and robust performance make it a popular choice among engineers and hobbyists working on custom electronic projects.
Equivalent
The LM317G is a popular adjustable voltage regulator. Equivalent products include:
1. LM317T by Texas Instruments
2. UA7800 series by Fairchild Semiconductor
3. L78XX series by STMicroelectronics
4. NTE956 by NTE Electronics
5. KA317 by ON Semiconductor
These regulators offer similar functionality, providing adjustable output voltage and current regulation. Make sure to check the exact specifications, as they can vary slightly between manufacturers.
1. LM317T by Texas Instruments
2. UA7800 series by Fairchild Semiconductor
3. L78XX series by STMicroelectronics
4. NTE956 by NTE Electronics
5. KA317 by ON Semiconductor
These regulators offer similar functionality, providing adjustable output voltage and current regulation. Make sure to check the exact specifications, as they can vary slightly between manufacturers.
Features
The LM317G is a versatile, adjustable linear voltage regulator designed to output a range of voltages from 1.25V to 37V with a maximum load current of 1.5A. Key features include:
1. Adjustable Output: Allows users to set the desired output voltage using external resistors.
2. Current Limiting: Provides inherent short-circuit protection by limiting the current to prevent damage under fault conditions.
3. Thermal Overload Protection: Automatically reduces output when the device temperature exceeds safe levels to prevent overheating.
4. Safe Operating Area Protection: Ensures device remains within safe limits under various operating conditions.
5. High Regulation: Provides stable voltage output with low line and load regulation.
6. Dropout Voltage: Typically requires only a 3V differential between input and output for proper operation.
7. Minimal External Components: Requires only a few external components for operation, simplifying design and reducing cost.
8. Package Options: Available in different package types for mounting flexibility.
These features make the LM317G ideal for applications requiring reliable and adjustable voltage regulation.
1. Adjustable Output: Allows users to set the desired output voltage using external resistors.
2. Current Limiting: Provides inherent short-circuit protection by limiting the current to prevent damage under fault conditions.
3. Thermal Overload Protection: Automatically reduces output when the device temperature exceeds safe levels to prevent overheating.
4. Safe Operating Area Protection: Ensures device remains within safe limits under various operating conditions.
5. High Regulation: Provides stable voltage output with low line and load regulation.
6. Dropout Voltage: Typically requires only a 3V differential between input and output for proper operation.
7. Minimal External Components: Requires only a few external components for operation, simplifying design and reducing cost.
8. Package Options: Available in different package types for mounting flexibility.
These features make the LM317G ideal for applications requiring reliable and adjustable voltage regulation.
Pinout
The LM317G is a three-terminal adjustable voltage regulator. It has the following pin configuration:
1. Pin 1 (Adjustment or Adj): This pin is used to adjust the output voltage. By connecting a resistor between this pin and the output, and another resistor between this pin and ground, the output voltage can be set anywhere from 1.25V to 37V.
2. Pin 2 (Output or Out): This is the output pin from which the regulated voltage is provided. The output voltage is determined by the resistor network connected to the Adj pin.
3. Pin 3 (Input or In): This pin receives the unregulated input voltage. The input voltage must always be higher than the desired output voltage by at least 3 volts to ensure proper regulation.
The LM317G can provide output currents up to 1.5A, given the condition of adequate heat dissipation. It is commonly used in power supply circuits to provide a stable and adjustable output voltage.
1. Pin 1 (Adjustment or Adj): This pin is used to adjust the output voltage. By connecting a resistor between this pin and the output, and another resistor between this pin and ground, the output voltage can be set anywhere from 1.25V to 37V.
2. Pin 2 (Output or Out): This is the output pin from which the regulated voltage is provided. The output voltage is determined by the resistor network connected to the Adj pin.
3. Pin 3 (Input or In): This pin receives the unregulated input voltage. The input voltage must always be higher than the desired output voltage by at least 3 volts to ensure proper regulation.
The LM317G can provide output currents up to 1.5A, given the condition of adequate heat dissipation. It is commonly used in power supply circuits to provide a stable and adjustable output voltage.
Manufacturer
The LM317G is a voltage regulator and can be manufactured by several companies, as it is a commonly produced component in the electronics industry. Notably, ON Semiconductor (now onsemi) is one of the manufacturers that produce the LM317G. onsemi is a leading semiconductor manufacturer that provides a broad range of semiconductor and integrated circuit solutions. The company specializes in energy-efficient solutions for applications in automotive, industrial, cloud power, and IoT sectors. They offer a variety of products, including power management ICs, sensors, and discrete devices, among others.
Application
The LM317G is a versatile voltage regulator commonly used in various applications. It is ideal for adjustable power supplies, allowing users to set precise output voltages. It is used in battery chargers to provide consistent charging voltages. In consumer electronics, it stabilizes the voltage for circuits. It also finds application in current regulation, LED drivers, and as a post-regulator for switching power supplies. Additionally, the LM317G is used in experimental and educational projects due to its simplicity and reliability. Its ability to handle a wide range of input voltages and deliver a stable output makes it suitable for both hobbyist and professional applications.
Package
The LM317G is typically available in a TO-220 package. This package type is widely used for voltage regulators and provides a suitable form factor for heat dissipation.
