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LM317G
IC REG LIN POS ADJ 1.5A SOT-223
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規格
| 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 |
概述
Description
The LM317G is a versatile adjustable voltage regulator widely used in electronic circuits. It can output a voltage range from 1.25V to 37V with a maximum output current of 1.5A. The regulator is designed to provide a stable output voltage that can be adjusted using external resistors, making it suitable for various applications, including power supplies, battery chargers, and other circuits requiring precise voltage regulation.
Key features of the LM317G include built-in thermal overload protection, short-circuit protection, and a safe operating area for enhanced reliability. It operates with a wide input voltage range, typically between 3V to 40V, allowing it to handle various power sources.
The device is available in multiple package types, including TO-220 and TO-263, making it suitable for both through-hole and surface-mount applications. Its ease of use and robustness make the LM317G a popular choice among hobbyists and professionals alike for designing efficient power management solutions.
Key features of the LM317G include built-in thermal overload protection, short-circuit protection, and a safe operating area for enhanced reliability. It operates with a wide input voltage range, typically between 3V to 40V, allowing it to handle various power sources.
The device is available in multiple package types, including TO-220 and TO-263, making it suitable for both through-hole and surface-mount applications. Its ease of use and robustness make the LM317G a popular choice among hobbyists and professionals alike for designing efficient power management solutions.
Features
The LM317G is a versatile adjustable voltage regulator with several key features:
1. Adjustable Output Voltage: Provides an output voltage range from 1.25V to 37V, allowing flexibility for various applications.
2. Current Capability: Delivers up to 1.5A of output current, supporting a wide range of devices.
3. Thermal Protection: Features built-in thermal overload protection to prevent damage from overheating.
4. Short-Circuit Protection: Includes current limiting to safeguard against short circuits.
5. Simple Design: Requires only two external resistors to set the output voltage, making implementation straightforward.
6. Wide Input Voltage Range: Accepts input voltages from 3V to 40V, accommodating diverse power supply scenarios.
7. Low Dropout Voltage: Offers a low dropout voltage (typically around 3V), enhancing efficiency in battery-operated devices.
8. TO-220 Package: Available in a durable TO-220 package, facilitating easy heatsinking and mounting.
These features make the LM317G ideal for various applications, including power supplies, battery chargers, and adjustable power sources.
1. Adjustable Output Voltage: Provides an output voltage range from 1.25V to 37V, allowing flexibility for various applications.
2. Current Capability: Delivers up to 1.5A of output current, supporting a wide range of devices.
3. Thermal Protection: Features built-in thermal overload protection to prevent damage from overheating.
4. Short-Circuit Protection: Includes current limiting to safeguard against short circuits.
5. Simple Design: Requires only two external resistors to set the output voltage, making implementation straightforward.
6. Wide Input Voltage Range: Accepts input voltages from 3V to 40V, accommodating diverse power supply scenarios.
7. Low Dropout Voltage: Offers a low dropout voltage (typically around 3V), enhancing efficiency in battery-operated devices.
8. TO-220 Package: Available in a durable TO-220 package, facilitating easy heatsinking and mounting.
These features make the LM317G ideal for various applications, including power supplies, battery chargers, and adjustable power sources.
Package
The LM317G is typically available in a TO-220 package type. This package is designed for efficient heat dissipation and is commonly used in adjustable voltage regulator applications.
Pinout
The LM317G is a popular adjustable voltage regulator with three pins. The pin configuration is as follows:
1. Adjust (ADJ): This pin is used to adjust the output voltage. By connecting a resistor network to this pin, you can set the desired output voltage between 1.25V and 37V.
2. Output (VOUT): This is the output pin where the regulated voltage is delivered to the load. The output voltage is determined by the resistor values connected to the Adjust pin.
3. Input (VIN): This pin receives the unregulated input voltage, which must be higher than the desired output voltage by a certain margin, typically at least 3V higher for proper regulation.
The LM317G is widely used in power supply applications due to its ease of use and flexibility in providing adjustable output voltages.
1. Adjust (ADJ): This pin is used to adjust the output voltage. By connecting a resistor network to this pin, you can set the desired output voltage between 1.25V and 37V.
2. Output (VOUT): This is the output pin where the regulated voltage is delivered to the load. The output voltage is determined by the resistor values connected to the Adjust pin.
3. Input (VIN): This pin receives the unregulated input voltage, which must be higher than the desired output voltage by a certain margin, typically at least 3V higher for proper regulation.
The LM317G is widely used in power supply applications due to its ease of use and flexibility in providing adjustable output voltages.
Manufacturer
The LM317G is manufactured by Texas Instruments (TI), a leading semiconductor company. Founded in 1930, Texas Instruments specializes in designing and manufacturing a wide range of electronic components, including analog and digital semiconductors, embedded processors, and various integrated circuits. The company is well-known for its innovation in the electronics industry and provides solutions for applications in automotive, industrial, communications, and consumer electronics. TI is recognized for its focus on research and development, contributing significantly to advancements in technology.
Application
The LM317G is a versatile voltage regulator commonly used in power supplies, battery chargers, and adjustable voltage applications. It provides a stable output voltage, making it ideal for low to medium power electronics, audio equipment, and microcontroller circuits. Additionally, it is used in LED drivers and as a reference voltage source in various electronic projects. Its adjustable output capability allows for flexibility in design, making it suitable for prototyping and custom applications.
Equivalent
Equivalent products to the LM317G voltage regulator include the LM317 (standard version), LM317T, LM1117, LT1085, and LM338. These devices provide adjustable output voltages and similar functionalities. Depending on specific requirements, alternatives like the MIC2940 or TPS7A47 may also be suitable. Always check specifications for compatibility in your application.
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