onsemi

LM2576D2T-ADJ

LM2576D2T-ADJ Description

The LM2576D2T-ADJ from onsemi is a high-efficiency, adjustable-output 3A step-down (buck) switching voltage regulator in a D2PAK-5 surface-mount package. Designed for flexibility, it supports positive or negative output configurations with an adjustable output range of 1.23V to 37V, making it suitable for diverse power supply designs. Its wide input voltage range (7V to 40V) and 52kHz fixed switching frequency ensure stable performance in demanding environments. Although marked as obsolete, it remains a reliable choice for legacy systems due to its robust design and REACH compliance.

LM2576D2T-ADJ Features

• Adjustable Output: Precision 1.23V reference enables custom voltage settings via external resistors.
• High Current Capacity: Delivers 3A continuous output current with minimal dropout.
• Wide Input Range: Operates from 7V to 40V, ideal for automotive, industrial, and telecom applications.
• Non-Synchronous Buck Topology: Simplified design with low external component count.
• Thermal & Short-Circuit Protection: Built-in safeguards enhance reliability.
• 52kHz Switching Frequency: Balances efficiency and noise, reducing EMI filter needs.
• MSL1 (Unlimited Shelf Life): Suitable for long-term storage and harsh environments.

LM2576D2T-ADJ Applications

• Industrial Power Systems: Powers PLCs, motor controllers, and sensors.
• Automotive Electronics: Suitable for infotainment, lighting, and 12V/24V bus converters.
• Negative Voltage Generation: Configurable for -5V, -12V, or -15V supplies in audio/RF circuits.
• Embedded Systems: Efficiently steps down 24V/36V rails to logic-level voltages (e.g., 3.3V/5V).
• Legacy Equipment Upgrades: Replaces linear regulators to reduce heat and improve efficiency.

Conclusion of LM2576D2T-ADJ

The LM2576D2T-ADJ excels in high-current, adjustable-voltage applications with its wide input range, robust protection, and compact footprint. While obsolete, its proven topology and onsemi’s reliability make it a pragmatic choice for cost-sensitive or legacy designs. Engineers value its simplicity, efficiency (~80–90%), and versatility in both positive and negative rail conversions. For modern alternatives, consider checking onsemi’s latest buck regulators, but for existing systems, this IC remains a workhorse.