Part Number: LM317MBDTRKG

Manufacturer: onsemi


Shipped from: Shenzhen/HK Warehouse

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Technical Specifications of LM317MBDTRKG

Datasheet  LM317MBDTRKG datasheet
Category Integrated Circuits (ICs)
Family PMIC – Voltage Regulators – Linear
Manufacturer ON Semiconductor
Packaging Tape & Reel (TR)
Part Status Active
Regulator Topology Positive Adjustable
Voltage – Output 1.2 V ~ 37 V
Current – Output 500mA
Voltage – Dropout (Typical)
Number of Regulators 1
Voltage – Input Up to 40V
Current – Limit (Min)
Operating Temperature -40°C ~ 125°C
Mounting Type Surface Mount
Package / Case TO-252-3, DPak (2 Leads + Tab), SC-63
Supplier Device Package DPAK-3


The LM317MBDTRKG is a highly efficient and versatile three-terminal positive voltage regulator. This regulator is highly versatile and user-friendly, as it can provide a current of over 500 mA and accommodate output voltages ranging from 1.2 V to 37 V. The LM317MBDTRKG is designed to provide reliable performance in various applications by incorporating internal thermal shutdown, current limiting, and safe area compensation. The purpose of this guide is to offer you a thorough comprehension of the LM317MBDTRKG and how it can be utilized in various applications.

Understanding the LM317MBDTRKG

Basic Overview

The LM317MBDTRKG is a three-terminal voltage regulator with a positive output voltage that can be adjusted. It has an output voltage range of 1.2 V to 37 V and can deliver more than 500 mA of current. This regulator is made to be easy to use, and you only need two external resistors to set the output voltage you want. It also has current limiting, thermal shutdown, and safe area compensation built in. This makes it very stable and hard to break.

Pin Configuration

The LM317MBDTRKG has three pins, and each one serves a different purpose:

  • Pin 1 (Adjust): You add an external resistor network to this pin to set the output voltage you want.
  • Pin 2 (Output): This pin is where the controlled output voltage comes out.
  • Pin 3 (Input): This is where you put the input voltage, which can be anywhere from a few volts above the output voltage you want to up to 40 V.

Features and Specifications

The LM317MBDTRKG has a number of important features and specs, such as:

  • Adjustable output voltage: The output voltage can be set anywhere between 1.2 V and 37 V.
  • It can generate more than 500 mA of current.
  • Setting the voltage is easy; you only need two external resistors to set the output voltage you want.
  • Internal current limiting Keeps too much current from flowing through the regulator and the linked circuitry.
  • Thermal shutdown: If the temperature goes over the limit you set, the regulator shuts off automatically to avoid damage.
  • Safe area compensation: This makes sure that the system works safely even when the load is very high.
  • Wide input voltage range: accepts values from a few volts above the output voltage up to a maximum of 40 V.
  • Low dropout voltage: Even when the input voltage is close to the ideal output voltage, the output voltage stays stable.

Benefits of Using LM317MBDTRKG

Engineers and builders can get a lot out of the LM317MBDTRKG:

  • Versatility: It can be used for different things, like regulating power locally and on-card.
  • Ease of use: Setting the output voltage only requires two external resistors, which makes the planning process easier.
  • Reliable performance: Internal current limiting, thermal shutdown, and safe area compensation protect against failure and ensure a high level of dependability.
  • Flexibility: With the addition of a set resistor, the LM317MBDTRKG can work as an adjustable switching regulator, a programmable output regulator, or a precision current regulator.
  • Cost-effective solution: By putting multiple functions into one part, it cuts down on the need for extra electronics and parts, which saves money.

Applications of LM317MBDTRKG

  • Local and On-Card Regulation: It can be used to control the voltage on circuit boards for certain parts and sections.
  • Adjustable Switching Regulator: Can be used to step up or step down power in high-efficiency switching regulator circuits.
  • Programmable Output Regulator: This allows the output voltage to be changed and controlled in real time for things like power sources and battery chargers.
  • Precision Current Regulator: By adding a set resistor, it can be used as a stable and accurate current source for LED drivers and analog circuits.

The LM317MBDTRKG is flexible and reliable in a wide range of electronic systems, from local control to programmable output and adjustable switching. It can also be used as a precision current limiter to control the current very precisely in certain situations.

Design Considerations

● Current Limiting

Current limiting is a key part of the LM317MBDTRKG that protects both the regulator and the circuitry that is attached to it. It makes sure that the output power doesn’t go over a safe limit. This prevents overheating, damage to components, and other possible problems. By using internal current limiting, the LM317MBDTRKG automatically lowers the output current when it hits the set threshold. This is a strong way to protect the system.

● Thermal Shutdown

The LM317MBDTRKG has a thermal shutdown device to keep it from getting too hot and causing damage. When the device’s internal temperature goes above a certain point, the thermal shutdown turns on, temporarily turning off the control. This keeps the LM317MBDTRKG from getting too hot, which makes it more reliable and last longer. When the temperature goes back down to a safe level, the regulator goes back to working normally.

● Safe Area Compensation

Another important part of the LM317MBDTRKG’s design is that it has a safe area adjustment. It makes sure that the process is safe and reliable, even when the load is very heavy. The regulator’s internal hardware is made to limit the amount of power that leaves the device and the voltage across it. This keeps the device from operating in ways that could damage or break it. Safe area compensation gives the LM317MBDTRKG an extra level of safety and stability, which lets it work within its safe limits.

● Input and Output Capacitors

For LM317MBDTRKG-based systems to be more stable and work better, input and output capacitors must be used. Input capacitors help filter out noise, attenuate voltage spikes, and improve transient reactions. They also lessen the effects of changes in the input impedance, which keeps the regulator’s input voltage stable. On the other hand, output capacitors make the system more stable by reducing ripple in the output voltage, improving reaction to sudden changes, and maintaining load regulation. To get the best performance and avoid stability problems, it’s important to choose the right capacitors based on the needs of the application.

LM317MBDTRKG-based systems work better, are more reliable, and are safer when current limiting, thermal shutdown, safe area compensation, and choosing the right capacitors are taken into account. By making good use of these design factors, engineers can improve their circuits and make sure the regulator works within the parameters it was designed for while giving the connected components stable, regulated power.


The LM317MBDTRKG adjustable voltage regulator is a versatile and reliable option for various electronic applications. In summary, it can be concluded that this regulator is a great choice. The device’s high level of convenience, ability to adjust voltage range, and inclusion of internal protection mechanisms make it extremely advantageous.

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The LM317MBDTRKG is a valuable component in electronic systems due to its reliable voltage regulation, ease of use, and comprehensive protection features. By partnering with ICRFQ, you can efficiently acquire this product as well as other electronic components.

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