L4973D3.3-013TR

Voltage Regulators - DC DC Switching Regulators Overview

The L4973D3.3-013TR is a monolithic step-down switching regulator from STMicroelectronics, housed in a 20-pin SOIC package. It delivers a fixed 3.3V output at up to 3.5A current capability. The device operates with an input voltage range of 8V to 55V and features a switch frequency adjustable up to 300kHz. Key electrical parameters include a typical internal D-MOS on-resistance of 0.15Ω, a maximum operating temperature of +150°C, and a minimum operating temperature of -40°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal power D-MOS transistor for high efficiency and fast switching speeds within a BCD mixed technology process.
• Includes comprehensive protection mechanisms such as pulse-by-pulse current limiting, hiccup mode for short circuits, thermal shutdown, and feedback disconnection detection.
• Supports zero current consumption via an inhibit function and incorporates soft-start functionality to manage inrush currents during startup.

Voltage Regulators - DC DC Switching Regulators Applications

• Driving multiple high-current white LEDs connected in series
• General-purpose DC-DC conversion for industrial systems requiring wide input voltage ranges
• Power supply stages in automotive electronics

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix '-013TR' confirms the tape-and-reel packaging format required for automated assembly processes. Ensure the component grade matches industrial specifications if operating near the upper temperature limits. Cross-reference the datasheet revision date to confirm pinout compatibility and parameter consistency before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 3.3V output is required alongside high current delivery capabilities exceeding standard linear regulators. The wide input voltage range makes it suitable for noisy or variable power environments. Consider the thermal dissipation requirements of the SO-20 package given the high current capacity and internal resistance characteristics.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L4973 family of buck converters designed for robust performance in demanding applications. It shares architectural similarities with other members like the L4971 but offers higher current handling. The family utilizes advanced BCD technology to balance control logic precision with power stage efficiency.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes within the same manufacturer line include the L4973D5.1 variant for different fixed voltage needs. For adjustable output configurations, the base L4973 model allows external programming. Verify pin compatibility and thermal performance when considering cross-brand alternatives.