Overview
The LM317D2T is a monolithic integrated circuit designed by STMicroelectronics, intended for use as a positive adjustable voltage regulator. It is part of the LM317 series, which includes various package types such as TO-220, TO-220FP, D²PAK, and SOT223. This regulator 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 is exceptionally easy to use, thanks to its simple resistive divider configuration for setting the output voltage, eliminating the need for multiple fixed regulators.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | 0 to 125 | °C |
| 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 | 5 to 70 mV (VO ≤ 5 V), 0.1 to 1.5 % (VO ≥ 5 V) | mV, % |
| Adjustment Pin Current | 50 to 100 µA | µA |
| Reference Voltage | 1.2 to 1.3 V | V |
| Thermal Resistance Junction-Ambient | 62.5 °C/W (D²PAK) | °C/W |
| Packing Type | Tape And Reel | |
| RoHS Compliance | Ecopack2 | |
| Package Name | D²PAK |
Key Features
- Adjustable Output Voltage: The output voltage can be adjusted over a range of 1.2 to 37 V using a simple resistive divider configuration.
- High Output Current: Capable of supplying more than 1.5 A of load current.
- Line and Load Regulation: Offers 0.1% line and load regulation, ensuring stable output voltage under varying input and load conditions.
- Floating Operation: Allows regulation of high voltage supplies relative to ground, as long as the maximum input-to-output differential voltage is not exceeded.
- Protection Features: Includes current limiting, thermal shutdown, and Safe Operating Area (SOA) control for enhanced reliability.
- Low Output Noise: Features low output noise voltage, making it suitable for applications requiring minimal noise.
- High Supply Voltage Rejection: Provides good supply voltage rejection, especially when a capacitor is connected between the adjustment pin and ground.
Applications
- Power Supplies: Ideal for building adjustable power supplies with high current capability.
- Voltage Regulation: Suitable for applications requiring precise voltage regulation, such as in electronic test equipment and laboratory power supplies.
- Current Regulation: Can be used as a precision current regulator by connecting a fixed resistor between the adjustment and output pins.
- Battery Charging Systems: Useful in battery charging circuits where adjustable voltage and current are required.
- Industrial Control Systems: Applicable in industrial control systems that need reliable and adjustable voltage regulation.
Q & A
- What is the output voltage range of the LM317D2T?
The output voltage range of the LM317D2T is 1.2 to 37 V.
- What is the maximum output current of the LM317D2T?
The LM317D2T can supply more than 1.5 A of load current.
- What type of package does the LM317D2T come in?
The LM317D2T comes in a D²PAK package.
- What are the key protection features of the LM317D2T?
The LM317D2T includes current limiting, thermal shutdown, and Safe Operating Area (SOA) control.
- How is the output voltage adjusted on the LM317D2T?
The output voltage is adjusted using a resistive divider configuration between the adjustment and output pins.
- What is the thermal resistance junction-ambient of the LM317D2T in D²PAK package?
The thermal resistance junction-ambient of the LM317D2T in D²PAK package is 62.5 °C/W.
- Is the LM317D2T RoHS compliant?
Yes, the LM317D2T is RoHS compliant with Ecopack2 certification.
- What is the operating temperature range of the LM317D2T?
The operating temperature range of the LM317D2T is 0 to 125 °C.
- Can the LM317D2T be used as a current regulator?
Yes, the LM317D2T can be used as a precision current regulator by connecting a fixed resistor between the adjustment and output pins.
- What are some common applications of the LM317D2T?
The LM317D2T is commonly used in power supplies, voltage regulation, current regulation, battery charging systems, and industrial control systems.
