Introduction

The LM317 device is an adjustable three-terminal positive-voltage regulator capable of supplying more than 1.5 A over an output-voltage range of 1.25 V to 37 V. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even if the ADJUST terminal is disconnected.

Specification

• Output voltage range adjustable from 1.25 V to 37 V
• Output current greater than 1.5 A
• Internal short-circuit current limiting
• Thermal overload protection
• Output safe-area compensation

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, lowvoltage, 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