Overview
The LM317MDCYG3 is an adjustable three-terminal positive-voltage regulator produced by Texas Instruments. This device is capable of supplying up to 1.5 A of output current over an adjustable output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the desired output voltage, making it highly versatile and easy to use in various applications. The LM317MDCYG3 features internal current limiting, thermal overload protection, and safe operating area protection, ensuring robust performance and reliability.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Output Voltage Range | 1.25 V to 37 V | V |
| Output Current | Up to 1.5 A | A |
| Input Voltage Range | 3.75 V to 40 V | V |
| Line Regulation | Typical 0.01% | % |
| Load Regulation | Typical 0.1% | % |
| PSRR (120 Hz) | 80 dB | dB |
| Operating Junction Temperature | -40°C to 125°C | °C |
| Thermal Resistance (Junction-to-Ambient) | 60.2 °C/W | °C/W |
| Package | SOT-223 | |
| Body Size | 6.5 mm x 3.5 mm | mm |
Key Features
- Adjustable output voltage range from 1.25 V to 37 V.
- Output current greater than 1.5 A.
- Internal short-circuit current limiting and thermal overload protection.
- Safe operating area protection.
- Optional output capacitor for improved transient response.
- High ripple-rejection ratios achievable by bypassing the ADJUST terminal.
- Floating operation for high voltage applications.
- Pb-Free packages available.
Applications
- 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 LM317MDCYG3?
The output voltage range of the LM317MDCYG3 is adjustable from 1.25 V to 37 V.
- What is the maximum output current of the LM317MDCYG3?
The LM317MDCYG3 can supply up to 1.5 A of output current.
- What types of protection does the LM317MDCYG3 have?
The LM317MDCYG3 includes internal short-circuit current limiting, thermal overload protection, and safe operating area protection.
- How do you set the output voltage of the LM317MDCYG3?
The output voltage is set using two external resistors connected between the INPUT, OUTPUT, and ADJUST terminals.
- What is the recommended operating temperature range for the LM317MDCYG3?
The recommended operating temperature range is -40°C to 125°C.
- Can the LM317MDCYG3 be used as a precision current regulator?
Yes, by connecting a fixed resistor between the ADJUST and OUTPUT terminals, the LM317MDCYG3 can function as a precision current regulator.
- What is the thermal resistance (junction-to-ambient) of the LM317MDCYG3 in the SOT-223 package?
The thermal resistance (junction-to-ambient) is 60.2 °C/W.
- Does the LM317MDCYG3 require any external capacitors for operation?
An input capacitor is not required but is recommended for stability, and an optional output capacitor can be added to improve transient response.
- What are some common applications of the LM317MDCYG3?
Common applications include ATCA solutions, DVR and DVS, desktop PCs, energy harvesting, and various industrial and consumer electronics.
- Is the LM317MDCYG3 available in Pb-Free packages?
Yes, Pb-Free packages are available for the LM317MDCYG3.
