LM5156DSSR

Overview

The LM5156DSSR is a non-synchronous DC-DC switching controller from Texas Instruments, designed for boost, flyback, and SEPIC topologies. It operates with an input voltage range of 3.5 V to 60 V and supports adjustable output voltages from 1.5 V to 300 V. The device features a programmable switching frequency between 100 kHz and 2.2 MHz, enabling compact passive component selection. It delivers up to 1.5 A output current and includes integrated shutdown functionality. Operating temperatures span from -40°C to +125°C, housed in a WSON-12 surface-mount package.

Feature Summary

• Supports multiple converter topologies including boost, flyback, and SEPIC configurations.
• Enables high-frequency operation up to 2.2 MHz for reduced solution size.
• Features wide input voltage capability suitable for diverse power sources.
• Includes peak current mode control with integrated soft-start and protection.

Applications

• Industrial power supply designs
• Automotive electronics systems
• Battery-powered equipment
• Point-of-load regulation modules

Procurement Notes

Verify the exact suffix DSSR against the manufacturer datasheet to confirm the specific tape-and-reel packaging configuration and temperature grade. Ensure compatibility with the intended PCB footprint for the WSON-12 package. Cross-reference the ordering part number with official Texas Instruments documentation to avoid substitution errors during procurement.

Selection Notes

Select this controller when designing isolated or non-isolated converters requiring wide input ranges and high efficiency. Consider the thermal performance within the WSON-12 package for the expected load conditions. Evaluate the external component requirements for the chosen switching frequency to optimize board space and cost while maintaining stability across the operating temperature range.

Part Context

This component belongs to the LM5156x family of wide-input non-synchronous controllers. It shares architectural similarities with other devices in the series but differs in pinout and package options. The family targets applications needing flexible topology support and robust protection features in a compact form factor.

Replacement Considerations

Check for LM51561 variants if synchronous rectification is required. Verify pin-to-pin compatibility with LM5155 models for direct upgrades in existing boost-only designs. Confirm electrical specifications match before substituting with other PMIC solutions.

FAQ

Is the LM5156DSSR a synchronous controller?

No, it is a non-synchronous controller designed for use with external MOSFETs.

What is the maximum switching frequency supported?

The device supports switching frequencies up to 2.2 MHz.