Texas Instruments LM317MQDCYR Adjustable Voltage Regulator, 500mA, SOT-223-4

The Texas Instruments LM317MQDCYR is a highly versatile, 3-terminal adjustable linear voltage regulator capable of delivering more than 500mA across a broad output range of 1.25V to 37V. Its exceptional ease of use is a standout feature, requiring only two external resistors to set the desired output voltage, making it a favourite for both prototyping and final designs.

This regulator surpasses standard fixed regulators in performance, offering superior line and load regulation for a more stable and reliable power supply. It is engineered with robust on-chip protection, including internal short-circuit current limiting, thermal-overload protection, and safe-operating-area compensation. Crucially, all these protective features remain fully operational even if the ADJUST terminal is disconnected, enhancing circuit safety.

As a floating regulator with no device ground terminal, it offers design flexibility. The quiescent current flows to the load, increasing efficiency rather than being wasted. This architecture allows for the creation of regulated output voltages of hundreds of volts, provided the maximum input-to-output differential does not exceed 40V at any time. The device can also be configured as a precision floating current source controlled by a single resistor.

Manufactured as a green product with no antimony or bromine (Sb/Br), it meets modern environmental standards. Its compact SOT-223-4 package is suitable for space-constrained applications, providing a reliable power management solution for a wide array of electronic projects and commercial products.

Key Specifications

• Output Type: Adjustable
• Number of Outputs: 1
• Output Voltage Range: 1.25V to 37V
• Input Voltage Range: 3V to 40V
• Maximum Output Current: 500mA
• Maximum Input-Output Differential: 40V
• Operating Temperature Range: -40°C to 125°C
• Package Type: SOT-223-4 (4 pins)