onsemi

MC34167T

MC34167T Description

The MC34167T from onsemi is a high-performance, adjustable DC switching voltage regulator designed for demanding power management applications. This obsolete but robust IC supports both buck and boost topologies, making it highly versatile for converting input voltages ranging from 7.5V to 40V into a regulated output adjustable from 5.05V up to 40V (switch-dependent). With a 5.5A switching current capability and a fixed 72kHz switching frequency, it balances efficiency and performance for medium-power systems. Packaged in a TO-220-5 through-hole format, it is suited for prototyping and industrial designs requiring reliable through-hole mounting.

MC34167T Features

• Wide Input Range (7.5V–40V): Accommodates fluctuating input sources, ideal for automotive or industrial environments.
• Adjustable Output (5.05V–40V): Supports both step-down (buck) and step-up (boost) configurations for flexible design.
• High Current Handling (5.5A Switch): Delivers robust power delivery for motors, LEDs, or embedded systems.
• Non-Synchronous Rectification: Simplifies design while maintaining efficiency at moderate loads.
• 72kHz Switching Frequency: Reduces output ripple and external component size compared to lower-frequency alternatives.
• TO-220-5 Package: Ensures mechanical durability and heat dissipation in high-temperature environments.

MC34167T Applications

• Industrial Power Supplies: Used in factory automation equipment requiring stable voltage conversion from unregulated sources.
• Automotive Systems: Powers infotainment, sensors, or lighting where input voltage varies widely (e.g., 12V/24V systems).
• LED Drivers: Adjustable output suits constant-current LED arrays in signage or architectural lighting.
• Telecom Infrastructure: Backup power modules or base station regulators benefiting from its wide input range.
• Legacy Equipment Repairs: A reliable choice for servicing obsolete systems due to its discontinued status.

Conclusion of MC34167T

The MC34167T stands out for its dual-topology capability, high current output, and wide voltage range, making it a versatile solution for engineers tackling complex power conversion challenges. While obsolete, its TO-220-5 package and 72kHz operation ensure compatibility with legacy designs and ease of integration. Ideal for industrial, automotive, and LED applications, it remains a pragmatic choice where adjustable, high-current regulation is critical. Designers should consider modern alternatives for new projects but may leverage this IC for repairs or specific use cases requiring its unique features.