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reference designEVAL-LTC7892-BZ | Demoboard EVAL-LTC7892-BZ

Analog Devices EVAL-LTC7892-BZ | Demoboard EVAL-LTC7892-BZ

High Frequency Step-Up Controller with 100V GaN FETs

Overview

TopologyBoost Converter
Input voltage9-36 V
Output 148 V / 20 A

Description

Evaluation circuit EVAL-LTC7892-BZ features the LTC®7892. The LTC7892 is a 100V step-up synchronous Gallium Nitride (GaN) field effect transistor (FET) controller optimized in this application with 100V GaN FETs for an operational 9V–36V input range at 500kHz. The EVAL-LTC7892-BZ is specifically designed to drive GaN FETs safely and easily up to 1.4kW power levels through internally optimized bootstrap switches and adaptive time control. Split gate drivers allow for easily adjustable turn-on and turn-off of FETs. Additionally, the IC features low IQ, up to 3MHz programmable/synchronizable switching frequency, spread spectrum, and a small 40-lead (6mm x 6mm) side wettable QFN package. These features allow various applications, including industrial, military, medical, and telecommunications systems.The EVAL-LTC7892-BZ operates from a 9V–36V input voltage range and generates a maximum 48V, 30A output. The LTC7892 has a precision voltage reference that can generate an output voltage with 2% tolerance over the full operating conditions. The EVAL-LTC7892-BZ is set to a 500kHz switching frequency, which results in a small and efficient circuit. The converter achieves over 98% efficiency with 30A load at full operating VIN, with a peak efficiency near 99%.

Features

GaN Drive Technology fully Optimized for GaN FETsOutput Voltage up to 100VWide VIN Range: 4V to 60V and Operates Down to 1V After Start-UpNo Catch, Clamp, or Bootstrap Diodes NeededInternal Smart Bootstrap Switches Prevent Overcharging of High-Side Driver SuppliesResistor Adjustable Dead TimesSplit Output Gate Drivers for Adjustable Turn-On and Turn-Off Driver StrengthsAccurate Adjustable Driver Voltage and UVLOLow Operating IQ: 15μAProgrammable Frequency (100kHz to 3MHz)Synchronizable Frequency (100kHz to 3MHz)Spread Spectrum Frequency Modulation40-Lead (6mm × 6mm), Side Wettable, QFN PackageAEC-Q100 Qualified for Automotive Applications

Typical applications

More information

Parts approved by Analog Devices

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L(mm)
Ti
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9774010243R
SPECWA-SMSI SMT Steel Spacer with internal Thread M2, 1 mm, M2
Availability
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Downloads7 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWA-SMSI SMT Steel Spacer with internal Thread M2
Length1 mm
Inner ThreadM2 
Outer Diameter4.35 mm
Inner Diameter2.8 mm
PackagingTape and Reel 
Packaging Unit1500 
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Additional parts recommended by Würth Elektronik

Recommended parts are Würth Elektronik alternatives that are not formally approved for this reference design. Please verify it is suitable for your application, and contact us if you have any questions.

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L(µH)
IRP,40K(A)
ISAT,10%(A)
ISAT,30%(A)
RDC max.(mΩ)
fres(MHz)
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7443630310
SPECWE-HCF SMT High Current Inductor, 3.1 µH, 33.15 A

PCN pending

Due to a pending PCN, a modification of the component will be implemented soon. Please find the PCN below. If you have further questions please get in contact with our sales staff.

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Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-HCF SMT High Current Inductor
Inductance3.1 µH
Performance Rated Current33.15 A
Saturation Current @ 10%41 A
Saturation Current @ 30%45 A
DC Resistance2.3 mΩ
Self Resonant Frequency29 MHz
Wire TypeFlat 
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