Overview
The LM317MSTT3, produced by onsemi, is an adjustable three-terminal positive-voltage regulator. It is capable of supplying output currents in excess of 1.5 A over an output voltage range of 1.25 V to 37 V. This regulator is known for its ease of use, requiring only two external resistors to set the desired output voltage. The LM317MSTT3 features internal current limiting, thermal shutdown, and safe area compensation, making it highly reliable and essentially blow-out proof.
Key Specifications
| Parameter | Value |
|---|---|
| Output Voltage Range | 1.25 V to 37 V |
| Output Current | Greater than 1.5 A |
| Line Regulation | Typical 0.01% |
| Load Regulation | Typical 0.1% |
| Thermal Overload Protection | Yes |
| Short Circuit Current Limiting | Yes |
| Safe Operating Area Protection | Yes |
| Minimum Load Current | Required to maintain output voltage stability |
| Package Types | SOT-223, TO-220, TO-263 |
| Operating Temperature Range | Typically 0°C to 125°C |
Key Features
- Adjustable output voltage between 1.25 V and 37 V
- Output current greater than 1.5 A
- Internal thermal overload protection and short-circuit current limiting
- Safe operating area protection
- Requires only two external resistors to set the output voltage
- Can be used as a precision current regulator by connecting a fixed resistor between the ADJUST and OUTPUT terminals
- Optional output capacitor for improved transient response
- High ripple-rejection ratios achievable by bypassing the ADJUST terminal
Applications
- Local, on-card regulation
- Programmable output regulation
- ATCA solutions
- DLP: 3D biometrics, hyperspectral imaging, optical networking, and spectroscopy
- DVR and DVS
- Desktop PCs
- Digital signage and still cameras
- ECG electrocardiograms
- EV HEV chargers: levels 1, 2, and 3
- Electronic shelf labels
- Energy harvesting
- Ethernet switches
- Femto base stations
- Fingerprint and iris biometrics
- HVAC: heating, ventilating, and air conditioning
- High-speed data acquisition and generation
- Hydraulic valves
- IP phones: wired and wireless
- Intelligent occupancy sensing
- Motor controls: brushed DC, brushless DC, low-voltage, permanent magnet, and stepper motors
- Point-to-point microwave backhauls
- Power bank solutions
- Power line communication modems
- Power over ethernet (PoE)
- Power quality meters
- Power substation controls
- Private branch exchanges (PBX)
- Programmable logic controllers
- RFID readers
- Refrigerators
- Signal or waveform generators
- Software-defined radios (SDR)
- Washing machines: high-end and low-end
- X-rays: baggage scanners, medical, and dental
Q & A
- What is the output voltage range of the LM317MSTT3?
The output voltage range is adjustable from 1.25 V to 37 V.
- What is the maximum output current of the LM317MSTT3?
The maximum output current is greater than 1.5 A.
- Does the LM317MSTT3 have thermal overload protection?
Yes, it includes internal thermal overload protection.
- How do you set the output voltage of the LM317MSTT3?
The output voltage is set using two external resistors connected between the ADJUST and OUTPUT terminals.
- Can the LM317MSTT3 be used as a current regulator?
Yes, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, it can function as a precision current regulator.
- What is the purpose of the ADJUST terminal in the LM317MSTT3?
The ADJUST terminal is used to set the output voltage and can also be bypassed to achieve high ripple-rejection ratios.
- Does the LM317MSTT3 require an output capacitor for stability?
No, an output capacitor is not required for stability but can be added to improve transient response.
- What are some common applications of the LM317MSTT3?
Common applications include local on-card regulation, programmable output regulation, ATCA solutions, and various industrial and consumer electronics.
- What are the package types available for the LM317MSTT3?
The LM317MSTT3 is available in SOT-223, TO-220, and TO-263 packages.
- What is the operating temperature range of the LM317MSTT3?
The operating temperature range is typically 0°C to 125°C.
