LTC7893

RECOMMENDED FOR NEW DESIGNS

100V Low I_Q, Synchronous Boost Controller for GaN FETs

Data Sheet (Rev. 0) Product Selection Table

Part Models: 4
1ku List Price: Starting From $2.09

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Overview

GaN Drive Technology Fully Optimized for GaN FETs
Output Voltage Up to 100V
Wide V_IN Range: 4V to 60V and Operates Down to 1V after Start-Up
No Catch, Clamp, or Bootstrap Diodes Needed
Internal Smart Bootstrap Switches Prevent Overcharging of High-Side Driver Supply
Resistor-Adjustable Dead Times
Split-Output Gate Drivers for Adjustable Turn On and Turn Off Driver Strengths

Accurate Adjustable Driver Voltage and UVLO
Low Operating I_Q: 15μA
Programmable Frequency (100kHz to 3MHz)
Synchronizable Frequency (100kHz to 3MHz)
Spread Spectrum Frequency Modulation
28-Lead (4mm × 5mm), Side Wettable, QFN Package
AEC-Q100 Qualified for Automotive Applications

The LTC®7893 is a high performance, step-up, dc-to-dc switching regulator controller that drives all N-channel synchronous gallium nitride (GaN) field effect transistor (FET) power stages from output voltages up to 100V. The LTC7893 solves many of the challenges traditionally faced when using GaN FETs. The LTC7893 simplifies the application design while requiring no protection diodes and no other additional external components compared to a silicon metal-oxide semiconductor field effect transistor (MOSFET) solution.

The internal smart bootstrap switches prevent overcharging of the BOOST pin to the SW pin high-side driver supply during dead times, protecting the gate of the top GaN FET. The dead times of the LTC7893 can optionally be optimized with external resistors for margin or to tailor the application for higher efficiency and allowing for high frequency operation.

The gate drive voltage of the LTC7893 can be precisely adjusted from 4V to 5.5V to optimize performance, and to allow the use of different GaN FETs, or even logic level MOSFETs. When biased from the boost converter regulator output, the LTC7893 can operate from an input supply as low as 1V after start-up.

Automotive and Industrial Power Systems
 Military Avionics and Medical Systems
 Telecommunications Power Systems

Part Models: 4
1ku List Price: Starting From $2.09

Documentation

Data Sheet 1

LTC7893: 100V Low IQ, Synchronous Boost Controller for GaN FETs Data Sheet (Rev.0) 11/07/2024

User Guide 1

EVAL-LTC7893-AZ User Guide: High Frequency Step-Up Controller with GaN FETs (Rev.0) 11/07/2024

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC7893AUFDM#PBF	28-Lead QFN (4mm x 5mm, Plastic Side Wettable)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7893AUFDM#TRPBF	28-Lead QFN (4mm x 5mm, Plastic Side Wettable)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7893AUFDM#WPBF	28-Lead QFN (4mm x 5mm, Plastic Side Wettable)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7893AUFDM#WTRPBF	28-Lead QFN (4mm x 5mm, Plastic Side Wettable)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 1

LTC7893 Example Circuit – High Frequency Step-up Supply with EPC GaN FETs, Input: 8V to 36V, Output:48V, Fsw: 500kHz

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

High Frequency Step-Up Controller with GaN FETs

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Product Details

The evaluation circuit EVAL-LTC7893-AZ is a single output synchronous step-up converter that drives GaN field effect transistors (FETs). The EVAL-LTC7893-AZ evaluation board features 100V GaN FETs.

The EVAL-LTC7893-AZ features the LTC®7893: a low quiescent current, high frequency (programmable fixed frequency from 100kHz up to 3MHz), step-up DC/DC synchronous controller, with a dedicated driver feature for GaN FETs, which can also be used to drive logic-level silicon FETs.

The EVAL-LTC7893-AZ operates over an input voltage range from 8V to 36V and produces a 48V output with load current up to 18A (without heatsink). A mode selector allows the EVAL-LTC7893-AZ to operate in forced continuous operation, pulse-skipping or Burst Mode® operation during light loads. The EVAL-LTC7893-AZ is set to 500kHz switching frequency, which results in a small and efficient circuit.

The performance summary table summarizes the performance of the evaluation circuit at room temperature. The evaluation circuit can be easily modified for different applications. The LTC7893 is housed in a 28-lead (4mm × 5mm), side-wettable QFN package. Refer to the data sheet in conjunction with this EVAL-LTC7893-AZ evaluation circuit user guide.

Design files for this circuit board are available at www.analog.com.