LTC7890RUJM#PBF

Overview

The LTC7890RUJM#PBF is a dual-channel, two-phase synchronous buck DC/DC controller optimized for driving GaN FET power stages. It supports input voltages from 4 V to 100 V and provides adjustable output voltages between 0.8 V and 60 V. The device features low quiescent current of 5 μA, programmable switching frequencies from 100 kHz to 3 MHz, and spread spectrum frequency modulation. It utilizes a 40-lead (6 mm × 6 mm) side-wettable QFN package.

Feature Summary

• Optimized GaN drive technology eliminates the need for external protection or bootstrap diodes
• Internal smart bootstrap switch prevents high-side driver power overcharging during deadtime
• Intelligent near-zero deadtime optimization improves efficiency at high input voltages
• Separate output gate drivers allow adjustable turn-on and turn-off drive strength

Applications

• Industrial power systems
• Military avionics and medical systems
• Telecommunications power supplies

Procurement Notes

Verify the specific suffix #PBF indicates tube packaging when sourcing components. Confirm that the manufacturer designation matches Analog Devices Inc. to ensure authenticity. Check datasheet revisions for any updates regarding thermal performance or pinout configurations before finalizing procurement orders.

Selection Notes

Select this component for applications requiring high-voltage inputs up to 100 V with dual-phase synchronization. It is suitable for designs utilizing GaN FETs where minimizing external component count is critical. Ensure the required switching frequency falls within the 100 kHz to 3 MHz range and verify compatibility with the target GaN device logic levels.

Part Context

This part belongs to the LTC7890/LTC7891 family of synchronous buck controllers designed specifically for GaN FETs. While the LTC7891 offers a single-channel configuration in a smaller package, the LTC7890 provides dual-channel capability in a 40-lead QFN format, supporting higher power density requirements in compact industrial and telecom form factors.

Replacement Considerations

LTC7891RUFDM#PBF serves as a single-channel alternative within the same family.