L4973D5.1-013TR

Voltage Regulators - DC DC Switching Regulators Overview

The L4973D5.1-013TR is a step-down monolithic power switching regulator from STMicroelectronics, delivering up to 3.5A output current. It provides a fixed 5.1V output with ±1% accuracy and supports adjustable outputs via an external divider. The device operates within an input voltage range of 8V to 55V and features a typical RDS(on) of 0.15Ω for high efficiency. It utilizes BCD mixed technology and offers a switching frequency adjustable up to 300kHz. The component is housed in a 20-SOIC surface-mount package.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated pulse-by-pulse current limiting and hiccup mode for robust short-circuit protection
• Includes soft start function to limit inrush current during startup
• Features thermal shutdown and protection against feedback loop disconnection
• Supports input/output synchronization for multi-phase or parallel applications

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial control systems requiring stable 5.1V rails
• Embedded power management for microprocessor supplies
• Automotive electronics operating within wide voltage ranges
• General-purpose DC-DC conversion in compact form factors

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'D5.1-013TR' to confirm the fixed 5.1V output variant and SOIC-20 packaging. Ensure compatibility with RoHS3 standards if required by your assembly process. Cross-reference the manufacturer part number with distributor codes to avoid confusion with other L4973 variants such as the 3.3V version or DIP packages. Confirm moisture sensitivity level requirements for storage and handling procedures.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a fixed 5.1V output at 3.5A is required with minimal external components. Consider the 20-SOIC package for surface-mount assembly constraints. Evaluate the 8V to 55V input range against your system's supply variations. Check if the 300kHz maximum switching frequency aligns with your EMI and filter size requirements compared to lower-frequency alternatives.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L4973 series of step-down switching regulators designed for high-efficiency power conversion. It complements other variants like the L4973D3.3-013TR (3.3V output) and L4973V5.1 (DIP package). The series is characterized by its ability to handle wide input voltages and provide reliable regulation in demanding environments, serving as a core PMIC solution for various industrial and commercial applications.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

L4973V5.1 is a direct functional equivalent offering the same 5.1V fixed output and 3.5A capability but in a 18-DIP through-hole package instead of SOIC-20. Designers must account for the pinout differences and thermal dissipation characteristics between the surface-mount and through-hole versions when substituting.