LM51581RTER

Voltage Regulators - DC DC Switching Regulators Overview

The LM51581RTER is a wide input voltage boost/SEPIC/flyback converter from Texas Instruments, housed in a WQFN-16 package. It integrates an 85V, 1.63A power switch and supports Boost, Flyback, and SEPIC topologies. The device operates with an input voltage range of 1.5V to 60V and delivers up to 83V output. It features a programmable switching frequency between 100kHz and 2.2MHz, low quiescent current, and dual random spread spectrum for EMI reduction. It includes protection features such as overvoltage, thermal shutdown, and peak current limit.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an 85V, 1.63A power switch for compact solution design
• Supports Boost, Flyback, and SEPIC topologies with wide input voltage range
• Features dual random spread spectrum to reduce electromagnetic interference
• Includes comprehensive protection mechanisms like thermal shutdown and overvoltage protection

Voltage Regulators - DC DC Switching Regulators Applications

• Battery-powered applications requiring wide input voltage tolerance
• Industrial systems utilizing flyback or SEPIC converter topologies
• Automotive electronics meeting AEC-Q100 standards
• General-purpose DC-DC conversion in space-constrained designs

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'RTER' corresponds to the cut-tape packaging format when ordering. Confirm that the 1.63A integrated switch rating aligns with your peak load requirements, as this variant differs from the 3.26A LM5158. Ensure the application circuit accounts for the 60V maximum bias pin voltage and 85V absolute maximum output rating to prevent device damage during transient events.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select the LM51581RTER when a lower current capacity (1.63A) than the standard LM5158 is sufficient, allowing for potentially smaller passive components. Consider this part for designs requiring the flexibility of multiple topologies within a single component family. Verify that the external resistor network can support the desired switching frequency range without exceeding the controller's operational limits.

Voltage Regulators - DC DC Switching Regulators Part Context

This component belongs to the LM5158x family of wide VIN converters designed for high-efficiency power management. It shares architectural similarities with the LM51571 but offers higher voltage handling capabilities. The device is part of Texas Instruments' portfolio aimed at simplifying design for industrial and automotive markets through integrated protection and flexible topology support.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM5158RTER serves as a direct functional replacement if the higher 3A current capability is acceptable for the application. For non-automotive general-purpose needs, verify compatibility with other LM5158 variants. No other specific substitute part numbers are publicly confirmed for this exact 1.63A specification.