Overview
The LM317BTG is an adjustable 3-terminal positive voltage regulator produced by onsemi. It is capable of supplying in excess of 1.5 A over an output voltage range of 1.2 V to 37 V. This regulator is known for its ease of use, requiring only two external resistors to set the output voltage. The LM317BTG features internal current limiting, thermal shutdown, and safe area compensation, making it highly reliable and essentially blow-out proof.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Current | 1.5 A | A |
| Output Voltage Range | 1.2 V to 37 V | V |
| Input-Output Voltage Differential | -0.3 to 40 Vdc | Vdc |
| Power Dissipation (Case) | Internally Limited | W |
| Thermal Resistance, Junction-to-Ambient | 65 °C/W (TO-220 package) | °C/W |
| Thermal Resistance, Junction-to-Case | 5.0 °C/W | °C/W |
| Operating Junction Temperature Range | -40° to +125°C | °C |
| Storage Temperature Range | -65° to +150°C | °C |
| Line Regulation | 0.01% to 0.04%/V | %/V |
| Load Regulation | 0.1% to 25 mV | % or mV |
| Reference Voltage | 1.2 to 1.3 V | V |
| Adjustment Pin Current | 50 to 100 µA | µA |
Key Features
- Output current in excess of 1.5 A
- Output voltage adjustable between 1.2 V and 37 V
- Internal thermal overload protection and short circuit current limiting
- Output transistor safe-area compensation
- Floating operation for high voltage applications
- Eliminates the need for stocking many fixed voltages
- Available in surface mount D2PAK-3 and standard 3-lead transistor package
- Pb-free, halogen-free/BFR-free, and RoHS compliant
- AEC-Q100 qualified and PPAP capable for automotive and other applications requiring unique site and control change requirements
Applications
The LM317BTG serves a wide variety of applications, including local, on-card regulation. It can be used to make a programmable output regulator or a precision current regulator by connecting a fixed resistor between the adjustment and output terminals. The device is suitable for high voltage applications and can be used in various configurations such as adjustable current limiters, electronic shutdown regulators, and slow turn-on regulators.
Q & A
- What is the output current range of the LM317BTG?
The LM317BTG can supply an output current in excess of 1.5 A.
- What is the adjustable output voltage range of the LM317BTG?
The output voltage can be adjusted between 1.2 V and 37 V.
- Does the LM317BTG have built-in protection features?
Yes, it includes internal thermal overload protection and short circuit current limiting.
- What packages are available for the LM317BTG?
The LM317BTG is available in surface mount D2PAK-3 and standard 3-lead transistor (TO-220) packages.
- Is the LM317BTG suitable for high voltage applications?
Yes, it supports floating operation for high voltage applications.
- How do I set the output voltage of the LM317BTG?
The output voltage can be set using two external resistors (R1 and R2) connected to the adjustment terminal.
- What is the reference voltage of the LM317BTG?
The reference voltage is typically 1.25 V.
- Does the LM317BTG require external capacitors for stability?
While it is stable with no output capacitance, external capacitors (Cin, CAdj, CO) can be used to improve performance and stability.
- Is the LM317BTG RoHS compliant?
Yes, the LM317BTG is Pb-free, halogen-free/BFR-free, and RoHS compliant.
- What are some common applications of the LM317BTG?
Common applications include local on-card regulation, programmable output regulators, precision current regulators, adjustable current limiters, and electronic shutdown regulators.
