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LM317MBDT

LM317MBDT Description

The LM317MBDT from onsemi is an adjustable positive linear voltage regulator in a DPAK (TO-252) surface-mount package. Designed for 500mA output current, it supports an input voltage range up to 40V and delivers an adjustable output voltage from 1.2V to 37V, making it highly versatile for various power supply designs. With low quiescent current (10 mA) and excellent PSRR (80dB to 65dB at 120Hz), it ensures stable and efficient voltage regulation. The device is obsolete but remains a reliable choice for legacy designs, offering robust protection features like over-current, over-temperature, and short-circuit protection.

LM317MBDT Features

• Adjustable Output Voltage (1.2V–37V): Precision voltage adjustment via external resistors.
• High Input Voltage (40V Max): Suitable for industrial and automotive applications.
• 500mA Output Current: Ideal for moderate-power circuits.
• Excellent PSRR (80dB at 120Hz): Minimizes noise and ripple for clean power delivery.
• Built-in Protections: Over-current, over-temperature, and short-circuit safeguards enhance reliability.
• Surface-Mount DPAK Package: Compact and thermally efficient for PCB integration.
• Low Quiescent Current (10 mA): Optimizes power efficiency in standby modes.

LM317MBDT Applications

The LM317MBDT excels in applications requiring adjustable, stable voltage regulation, such as:

• Bench Power Supplies: Adjustable output for prototyping and testing.
• Industrial Control Systems: Reliable voltage regulation in harsh environments.
• Automotive Electronics: Power management for sensors and infotainment systems.
• Consumer Electronics: Low-noise power for audio amplifiers and display drivers.
• Legacy Equipment Maintenance: Replacement for obsolete linear regulators in existing designs.

Conclusion of LM317MBDT

The LM317MBDT is a robust, adjustable linear regulator offering high voltage tolerance, precise regulation, and integrated protections. While marked as obsolete, its performance, thermal efficiency (DPAK package), and versatility make it a preferred choice for engineers maintaining or designing systems requiring dependable voltage control. Its high PSRR and low quiescent current further distinguish it from basic regulators, ensuring optimal performance in noise-sensitive and power-efficient applications.