LM5158QRTERQ1

Voltage Regulators - DC DC Switching Regulators Overview

The LM5158QRTERQ1 is an automotive-grade wide input voltage boost, flyback, and SEPIC converter from Texas Instruments. It integrates an 85V, 3.26A power switch and supports dynamic frequency programming from 100kHz to 2.2MHz. The device operates with a minimum input voltage of 1.5V when the BIAS pin is above 3.2V, or directly from a single-cell battery starting at 3.2V. It features precise peak current limiting, low quiescent current, and dual random spread spectrum for EMI reduction. The component includes overvoltage protection, thermal shutdown, and AEC-Q100 qualification.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Supports boost, flyback, and SEPIC topologies with integrated high-voltage power switch
• Enables single-cell battery startup and operation down to 1.5V input with proper biasing
• Incorporates dual random spread spectrum technology to minimize electromagnetic interference
• Provides comprehensive protection including overvoltage, thermal shutdown, and precise current limiting

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive lighting systems requiring wide input voltage ranges
• Battery-powered applications utilizing single-cell lithium-ion configurations
• Industrial power supplies needing isolated or non-isolated DC-DC conversion
• Systems demanding low electromagnetic interference in sensitive environments

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify that the specific part number suffix matches the required automotive grade and package configuration. Confirm that the BIAS pin circuitry aligns with the intended input voltage range to ensure stable startup. Ensure compliance with AEC-Q100 standards if deployed in qualified automotive platforms. Cross-reference the datasheet for exact thermal and electrical limits before finalizing the design.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing converters that require flexibility across multiple topologies such as boost, flyback, or SEPIC. It is suitable for applications needing wide input voltage coverage and low standby power consumption. Consider the integrated switch ratings against the maximum output requirements. Evaluate the need for spread spectrum features to meet strict EMI regulations in the target environment.

Voltage Regulators - DC DC Switching Regulators Part Context

This device belongs to the LM5158x family of wide VIN converters designed for robust performance in demanding environments. The Q1 suffix indicates automotive qualification under AEC-Q100 standards. It shares functional similarities with other members like the LM51581 but offers higher current capacity. The family emphasizes efficiency and compact solution sizes through high-frequency operation capabilities.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The LM51581QRTERQ1 serves as a lower-current alternative within the same family. Verify compatibility regarding switch current ratings and thermal management requirements when substituting components. Ensure that the control loop compensation remains valid for the new device characteristics.