LM5109ASD

Overview

The LM5109ASD is a high-voltage half-bridge gate driver designed to drive both high-side and low-side N-channel MOSFETs in synchronous buck or half-bridge configurations. It features a peak output current of 1A for both sourcing and sinking. The device operates with supply voltages ranging from 8V to 14V and supports bootstrap supply voltages up to 108V DC. It utilizes robust level-shift technology for clean transitions and includes under-voltage lockout on both power rails. The component is housed in an 8-WSON (4x4 mm) package.

Feature Summary

• Drives both high-side and low-side N-channel MOSFETs
• Independent TTL-compatible inputs for control
• Fast propagation times with excellent delay matching
• Low power consumption with rail under-voltage lockout

Applications

• Current fed push-pull converters
• Half and full bridge power converters
• Solid state motor drives
• Two switch forward converters

Procurement Notes

Verify the specific suffix 'ASD' against the latest Texas Instruments documentation, as this indicates the WSON-8 package variant. Confirm RoHS compliance status, as older revisions may differ from current NOPB versions. Ensure the design accounts for the 108V bootstrap voltage limit and thermal requirements of the small footprint package during operation.

Selection Notes

Select this component when a cost-effective solution for driving high-side and low-side MOSFETs is required. It is suitable for applications needing independent TTL-compatible logic inputs and fast switching speeds. Consider the 8-WSON package constraints for thermal management and PCB layout space compared to larger SOIC options.

Part Context

The LM5109 series comprises high-voltage gate drivers intended for driving N-channel MOSFETs in various power conversion topologies. The LM5109ASD specifically denotes the version packaged in an 8-pin WSON format. This family offers pin compatibility with other industry-standard drivers like the ISL6700, facilitating design upgrades or replacements.

Replacement Considerations

• LM5109ASD/NOPB

FAQ

What is the maximum bootstrap supply voltage for the LM5109ASD?

The floating high-side driver can operate with bootstrap supply voltages up to 108V DC.

Does the LM5109ASD support TTL logic levels?

Yes, the device features independent inputs that are compatible with TTL input thresholds.