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LM317EMP
+BOMIC REG LIN POS ADJ 1.5A SOT223-4
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ManufacturerTexas Instruments
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Mfr. Part #LM317EMP
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Package SOT-223 (DCY)-4
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In Stock6904
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Specifications
| Attribute | Value |
| Package | Tape & Reel (TR),Cut Tape (CT) |
| ProductStatus | Not For New Designs |
| OutputConfiguration | Positive |
| OutputType | Adjustable |
| NumberofRegulators | 1 |
| Voltage-Input(Max) | 37V |
| Voltage-Output(Min/Fixed) | 1.25V |
| Voltage-Output(Max) | 37V |
| Current-Output | 1.5A |
| PSRR | 80dB ~ 65dB (120Hz) |
| ProtectionFeatures | Over Current, Over Temperature, Short Circuit |
| OperatingTemperature | 0°C ~ 125°C |
| MountingType | Surface Mount |
| Package/Case | TO-261-4, TO-261AA |
Overview
Description
The LM317EMP is a voltage regulator integrated circuit used to provide adjustable output voltage in electronics applications. It is part of the LM317 family, known for its versatility and ease of use. This component can output a voltage range typically from 1.25V to 37V, with a maximum output current of 1.5A, making it suitable for a wide variety of power supply applications.
The EMP variant indicates a specific packaging type, usually a surface-mount package, which is advantageous for compact circuit designs. The LM317EMP requires only two external resistors to set the output voltage, and it includes features such as current limiting and thermal overload protection to prevent damage from overcurrent or overheating conditions.
Its ability to provide a stable and adjustable output makes it ideal for use in regulated power supplies, battery chargers, and other applications where precise voltage control is necessary. Its robust design ensures reliable performance in various environments, making it a popular choice among engineers and hobbyists alike.
The EMP variant indicates a specific packaging type, usually a surface-mount package, which is advantageous for compact circuit designs. The LM317EMP requires only two external resistors to set the output voltage, and it includes features such as current limiting and thermal overload protection to prevent damage from overcurrent or overheating conditions.
Its ability to provide a stable and adjustable output makes it ideal for use in regulated power supplies, battery chargers, and other applications where precise voltage control is necessary. Its robust design ensures reliable performance in various environments, making it a popular choice among engineers and hobbyists alike.
Equivalent
The LM317EMP is a voltage regulator chip. Equivalent products include:
1. L78xx series (like L7805, L7812) - by STMicroelectronics.
2. LM1086 - by Texas Instruments.
3. LM1117 - by Texas Instruments.
4. AMS1117 - by Advanced Monolithic Systems.
5. MC7800 series - by ON Semiconductor.
6. MIC29150 - by Microchip Technology.
These alternatives offer similar functionalities, with variations in output voltage regulation, current capacity, and package types. Always check specific datasheets for compatibility.
1. L78xx series (like L7805, L7812) - by STMicroelectronics.
2. LM1086 - by Texas Instruments.
3. LM1117 - by Texas Instruments.
4. AMS1117 - by Advanced Monolithic Systems.
5. MC7800 series - by ON Semiconductor.
6. MIC29150 - by Microchip Technology.
These alternatives offer similar functionalities, with variations in output voltage regulation, current capacity, and package types. Always check specific datasheets for compatibility.
Features
The LM317EMP is a versatile, adjustable three-terminal voltage regulator capable of supplying over 1.5A of output current with an output voltage range of 1.25V to 37V. Key features include:
1. Output Voltage Adjustability: Allows fine-tuning of the output voltage via external resistors.
2. Thermal Overload Protection: Prevents the regulator from overheating by shutting down in case of excessive temperature.
3. Current Limiting: Offers short-circuit protection by limiting the output current.
4. Safe Operating Area Protection: Ensures that the device operates within its safe limits.
5. High Ripple Rejection: Provides stable output even with fluctuating input voltage.
6. Robust Design: Reliable performance across a wide temperature range.
These features make the LM317EMP highly suitable for a variety of applications requiring stable voltage in electronics, such as power supplies, battery chargers, and adjustable power sources. Its compact package and high performance are ideal for both consumer and industrial devices.
1. Output Voltage Adjustability: Allows fine-tuning of the output voltage via external resistors.
2. Thermal Overload Protection: Prevents the regulator from overheating by shutting down in case of excessive temperature.
3. Current Limiting: Offers short-circuit protection by limiting the output current.
4. Safe Operating Area Protection: Ensures that the device operates within its safe limits.
5. High Ripple Rejection: Provides stable output even with fluctuating input voltage.
6. Robust Design: Reliable performance across a wide temperature range.
These features make the LM317EMP highly suitable for a variety of applications requiring stable voltage in electronics, such as power supplies, battery chargers, and adjustable power sources. Its compact package and high performance are ideal for both consumer and industrial devices.
Pinout
The LM317EMP is a three-terminal adjustable voltage regulator with a pin count of three. The three pins are:
1. Input (Pin 1): This pin receives the unregulated input voltage. It must be higher than the desired output voltage for proper regulation.
2. Output (Pin 2): This pin provides the regulated output voltage. The output voltage can be adjusted to a desired level using external resistors.
3. Adjustment (Pin 3): This pin is used to set the output voltage. By connecting a resistor between the adjustment pin and the output pin, and another resistor between the adjustment pin and ground, you can set the output voltage using the formula: \( V_{\text{out}} = V_{\text{ref}} \times \left(1 + \frac{R_2}{R_1}\right) + I_{\text{adj}} \times R_2 \), where \( V_{\text{ref}} \) is typically 1.25V and \( I_{\text{adj}} \) is the adjustment pin current.
The LM317EMP can provide a stable output voltage ranging from 1.25V to 37V, with an output current up to 500 mA, making it versatile for various applications.
1. Input (Pin 1): This pin receives the unregulated input voltage. It must be higher than the desired output voltage for proper regulation.
2. Output (Pin 2): This pin provides the regulated output voltage. The output voltage can be adjusted to a desired level using external resistors.
3. Adjustment (Pin 3): This pin is used to set the output voltage. By connecting a resistor between the adjustment pin and the output pin, and another resistor between the adjustment pin and ground, you can set the output voltage using the formula: \( V_{\text{out}} = V_{\text{ref}} \times \left(1 + \frac{R_2}{R_1}\right) + I_{\text{adj}} \times R_2 \), where \( V_{\text{ref}} \) is typically 1.25V and \( I_{\text{adj}} \) is the adjustment pin current.
The LM317EMP can provide a stable output voltage ranging from 1.25V to 37V, with an output current up to 500 mA, making it versatile for various applications.
Manufacturer
The LM317EMP is a voltage regulator manufactured by Texas Instruments. Texas Instruments is a global semiconductor company that designs and produces a wide range of analog and digital signal processing integrated circuits. Headquartered in Dallas, Texas, the company is known for its innovation in electronics, providing products used across various industries including automotive, industrial, personal electronics, communications equipment, and enterprise systems.
Application
The LM317EMP is a versatile, adjustable three-terminal voltage regulator used in various applications. It is commonly employed in power supply designs to provide a stable output voltage ranging from 1.25V to 37V with a load current of up to 1.5A. Key application areas include battery chargers, constant current regulators, adjustable power supplies, and LED drivers. It is also used in voltage regulation for microcontrollers and other electronic circuits requiring precise voltage levels. The device's ability to adjust the output voltage via external resistors makes it suitable for prototyping and custom electronics projects where specific voltage requirements are essential.
Package
The LM317EMP is a voltage regulator packaged in a SOT-223 form factor. This surface-mount package is suitable for compact applications, offering efficient thermal performance and space-saving benefits.
