TI LM317KCT

The LM317 is an adjustable 3-terminal positive voltage regulator capable of supplying more than 1.5A over an output voltage range of 1.25V to 37V. It requires only two external resistors to set the output voltage. The device features a typical line regulation of 0.01% and a typical load regulation of 0.1%. It includes current limiting, thermal overload protection, and safe operating area protection. Overload protection remains functional even when the adjustment terminal is open-circuited.

The device is widely used in applications including programmable output regulation and local on-board regulation. Alternatively, by connecting a fixed resistor between the adjustment and output terminals, the LM317 can be used as a precision current regulator. An optional output capacitor can be added to improve transient response. The adjustment terminal can be bypassed to achieve a very high ripple rejection ratio, which is difficult to achieve with standard 3-terminal regulators.

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

• ATCA Solutions
• DLP: 3D biometric recognition, hyperspectral imaging, fiber optic networks, and spectral analysis
• DVR and DVS
• Desktop computers
• Digital signage and still cameras
• Electrocardiogram (ECG)
• EV/HEV chargers: Level 1, Level 2, and Level 3
• Electronic shelf labels
• Energy harvesting
• Ethernet switches
• Femto base stations
• Fingerprint and iris recognition
• HVAC: heating, ventilation, and air conditioning
• High-speed data acquisition and generation
• Hydraulic valves
• IP telephony: wired and wireless
• Intelligent presence detection
• Motor control: brushed DC, brushless DC, low-voltage, permanent magnet, and stepper motors
• Point-to-point microwave backhaul
• Mobile power solutions
• Power line communication modems
• Power over Ethernet (PoE)
• Power quality analyzers
• Substation control
• Private Branch Exchange (PBX)
• Programmable logic controllers
• RFID readers
• Refrigerators
• Signal/waveform generators
• Software-defined radio (SDR)
• Washing machines: high-end and low-end
• X-ray: baggage scanners, medical, and dental