LTC7890RUJM#TRPBF

Overview

The LTC7890RUJM#TRPBF is a dual-channel, two-phase synchronous buck DC-DC controller optimized for Gallium Nitride (GaN) power devices. It supports an input voltage range of 4V to 100V and provides adjustable output voltages from 0.8V to 60V. The device features a programmable switching frequency between 100 kHz and 3 MHz with spread spectrum modulation capabilities. It operates within a junction temperature range of -40°C to +150°C and utilizes a 40-lead QFN package.

Feature Summary

• Integrated GaN drive technology fully optimized for driving N-channel synchronous GaFET power stages
• Internal intelligent bootstrap switch prevents overcharging of the high-side driver supply during dead-time intervals
• Internally optimized near-zero dead time or resistor-adjustable dead time to maximize efficiency at high input voltages
• Separate output gate drivers allow for adjustable turn-on and turn-off drive strength

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates tape-and-reel packaging when sourcing. Confirm the manufacturer is Analog Devices Inc. Ensure the component matches the 40-lead QFN physical dimensions. Check datasheet revisions for any updates to electrical characteristics or pinout definitions prior to final integration.

Selection Notes

Select this controller for applications requiring high-voltage input up to 100V and high-density power conversion using GaN FETs. It is suitable where low quiescent current and precise timing control are critical. Consider the 40-lead QFN footprint for PCB layout constraints. Verify that the external GaN FETs are compatible with the adjustable drive voltage range of 4V to 5.5V.

Part Context

This component belongs to the LTC7890/1 series of synchronous buck controllers designed specifically for GaN power devices. Unlike traditional silicon MOSFET solutions, these controllers eliminate the need for catch, clamp, or bootstrap diodes. The series simplifies design by integrating protection against high-side driver supply overcharging and optimizing gate drive timing for both switching edges.

FAQ

Does the LTC7890 require external catch or clamp diodes?

No, the LTC7890 does not require catch, clamp, or bootstrap diodes when used with N-channel synchronous GaN FETs.

How is the high-side driver supply protected from overcharging?

An internal intelligent bootstrap switch prevents the boost pin from overcharging the high-side driver supply during dead-time intervals.