Overview
The LM317D2T-TR is a positive adjustable voltage regulator produced by STMicroelectronics. It is part of the LM217 and LM317 series, designed to provide a high level of performance and reliability in various electronic systems. This regulator is available in the D²PAK package and is capable of supplying more than 1.5 A of load current with an output voltage adjustable over a range of 1.2 to 37 V. The device features excellent line and load regulation, along with internal protections such as current limiting, thermal shutdown, and SOA (Safe Operating Area) control.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage Range | 1.2 to 37 | V |
| Output Current | Internally limited, up to 1.5 A | A |
| Line Regulation | 0.01 to 0.07 %/V | %/V |
| Load Regulation | 0.1 to 1.5 % | % |
| Adjustment Pin Current | 50 to 100 µA | µA |
| Reference Voltage | 1.2 to 1.3 V | V |
| Operating Junction Temperature | 0 to 125 °C | °C |
| Thermal Resistance Junction-Ambient | 62.5 °C/W | °C/W |
| Packing Type | Tape And Reel | |
| RoHS Compliant | Ecopack2 | |
| Package Name | D²PAK |
Key Features
- Adjustable output voltage from 1.2 to 37 V
- Output current in excess of 1.5 A
- Excellent line and load regulation (0.01 to 0.07 %/V and 0.1 to 1.5 % respectively)
- Internal protections: current limiting, thermal shutdown, and SOA control
- Floating operation for high voltages
- Low adjustment pin current (50 to 100 µA)
- Reference voltage of 1.2 to 1.3 V
- Operating junction temperature range of 0 to 125 °C
- RoHS compliant (Ecopack2)
Applications
- Power supplies requiring adjustable output voltages
- High-voltage applications where the input-to-output differential voltage is significant
- Precision current regulators by connecting a fixed resistor between the adjustment and output pins
- Battery chargers and electronic shut-down regulators
- Systems requiring remote ground sensing and improved transient response
Q & A
- What is the output voltage range of the LM317D2T-TR?
The output voltage range is adjustable from 1.2 to 37 V.
- What is the maximum output current of the LM317D2T-TR?
The maximum output current is in excess of 1.5 A.
- What are the key internal protections of the LM317D2T-TR?
The device features current limiting, thermal shutdown, and SOA control.
- What is the operating junction temperature range of the LM317D2T-TR?
The operating junction temperature range is from 0 to 125 °C.
- Is the LM317D2T-TR RoHS compliant?
Yes, it is RoHS compliant (Ecopack2).
- What package type is the LM317D2T-TR available in?
The device is available in the D²PAK package.
- How is the output voltage of the LM317D2T-TR adjusted?
The output voltage is adjusted using a resistive divider connected to the adjustment pin.
- What are some common applications of the LM317D2T-TR?
Common applications include power supplies, high-voltage systems, precision current regulators, battery chargers, and electronic shut-down regulators.
- What are the thermal resistance values for the LM317D2T-TR?
The thermal resistance junction-ambient is 62.5 °C/W.
- How can the load regulation of the LM317D2T-TR be optimized?
Load regulation can be optimized by tying the current set resistor close to the regulator and using external capacitors for ripple rejection and transient response improvement.
