Overview
The LM217D2T-TR is a linear adjustable voltage regulator produced by STMicroelectronics. This device is part of the LM217 and LM317 series, known for their versatility and reliability in voltage regulation. The LM217D2T-TR is packaged in a D²PAK format, making it suitable for a variety of applications where space is a concern. It offers an adjustable output voltage range from 1.2V to 37V and can supply up to 1.5A of load current. The regulator features high line and load regulation, thermal shutdown, and current limiting, ensuring stable and safe operation under various conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage Range | 1.2 to 37 | V |
| Output Current | Up to 1.5 | A |
| Package | D²PAK | |
| Operating Junction Temperature | -25 to 150 | °C |
| Line Regulation | 0.01 to 0.05 %/V | |
| Load Regulation | 0.1 to 1 % | |
| Adjustment Pin Current | 50 to 100 µA | |
| Reference Voltage | 1.2 to 1.3 V | |
| Thermal Resistance Junction-Ambient | 62.5 °C/W |
Key Features
- Adjustable Output Voltage: The LM217D2T-TR allows for an adjustable output voltage range from 1.2V to 37V, making it highly versatile for various applications.
- High Current Capability: It can supply up to 1.5A of load current, suitable for power-intensive applications.
- High Line and Load Regulation: The device features excellent line and load regulation, ensuring stable output voltage under different input and load conditions.
- Protection Features: Includes current limiting, thermal shutdown, and SOA (Safe Operating Area) control to protect the device from overcurrent and overheating.
- Floating Operation: Can regulate high voltage supplies relative to ground, as long as the maximum input-to-output differential voltage is not exceeded.
- Easy to Use: The output voltage is set using a simple resistive divider, eliminating the need for multiple fixed regulators.
Applications
- Power Supplies: Ideal for building adjustable power supplies where the output voltage needs to be precisely controlled.
- Current Regulators: Can be used as a precision current regulator by connecting a fixed resistor between the adjustment and output pins.
- Battery Chargers: Suitable for battery charging applications, including those requiring low charging rates with fully charged batteries.
- Electronic Shut-Down Circuits: Can be integrated into electronic shut-down circuits for reliable power management.
- High Voltage Applications: Useful in applications requiring the regulation of high voltage supplies relative to ground.
Q & A
- What is the output voltage range of the LM217D2T-TR?
The output voltage range is adjustable from 1.2V to 37V.
- What is the maximum output current of the LM217D2T-TR?
The maximum output current is 1.5A.
- What package type is the LM217D2T-TR available in?
The LM217D2T-TR is packaged in a D²PAK format.
- What are the operating junction temperature limits for the LM217D2T-TR?
The operating junction temperature range is from -25°C to 150°C.
- Does the LM217D2T-TR have built-in protection features?
Yes, it includes current limiting, thermal shutdown, and SOA control.
- How is the output voltage set for the LM217D2T-TR?
The output voltage is set using a resistive divider connected between the adjustment and output pins.
- Can the LM217D2T-TR be used for high voltage applications?
Yes, it can regulate high voltage supplies relative to ground, as long as the maximum input-to-output differential voltage is not exceeded.
- What are some common applications for the LM217D2T-TR?
Common applications include power supplies, current regulators, battery chargers, and electronic shut-down circuits.
- How can I improve the load regulation of the LM217D2T-TR?
Load regulation can be improved by tying the current set resistor close to the regulator and using remote ground sensing for the load.
- Are there any recommended external components for the LM217D2T-TR?
Yes, external capacitors such as an input bypass capacitor, an adjustment terminal to ground capacitor, and an output capacitor can improve performance and stability.
