LM5105SDX/NOPB

Overview

The LM5105SDX/NOPB is a half-bridge gate driver IC designed for synchronous MOSFET applications. It features non-inverting inputs and supports N-channel MOSFETs with peak source and sink currents of 1.8A each. The device operates within a supply voltage range of 8V to 14V and withstands high-side bootstrap voltages up to 118V. Typical rise and fall times are 15ns. It is housed in a 10-WSON (4x4) package with an exposed pad, suitable for surface mount mounting, and functions across a junction temperature range of -40°C to 125°C.

Feature Summary

• Provides robust drive capability for synchronous N-channel MOSFETs with symmetrical 1.8A peak output current.
• Supports high-voltage floating operation with a maximum high-side bootstrap voltage rating of 118V.
• Features fast switching performance with typical 15ns rise and fall times for efficient power conversion.
• Includes logic level compatibility with defined input threshold voltages for reliable digital interface.

Applications

• Synchronous buck converters
• Half-bridge power stages
• Isolated DC/DC converter drivers

Procurement Notes

Verify the specific suffix NOPB indicates lead-free and RoHS compliance compared to older variants like LM5105SD which may be obsolete. Confirm the 10-WSON package dimensions match your PCB footprint requirements. Ensure the supply voltage remains within the 8V to 14V operational window during system testing. Check datasheet for thermal dissipation needs given the exposed pad design.

Selection Notes

Select this component when driving synchronous N-channel MOSFETs in half-bridge configurations requiring high-side voltage isolation up to 118V. It is suitable for applications needing moderate peak current drive of 1.8A with fast switching speeds. Consider the 10-WSON package size for space-constrained designs. Verify that the control logic levels align with the specified VIL and VIH thresholds.

Part Context

This part belongs to the LM5105 family of half-bridge gate drivers from Texas Instruments. It serves as a direct replacement for the discontinued LM5105SD variant, offering updated manufacturing standards. The device is categorized under Power Management ICs specifically as a Gate Driver, distinct from switching regulators or controllers in the same product line.

Replacement Considerations

LM5105SD/NOPB is a confirmed direct substitute for the LM5105SD. Verify pinout and electrical specifications remain identical before substitution. Other family members like LM5106 offer similar functionality but may have different current ratings or timing characteristics.