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reference designLT8390A | Demoboard EVAL-LT8390A-AZ

Analog Devices LT8390A | Demoboard EVAL-LT8390A-AZ

60V High-Frequency Synchronous GaN Buck-Boost Controller

Overview

TopologyBuck-Boost Converter
Input voltage8-60 V
Switching frequency2000-2500 kHz
Output 124 V / 5 A

Description

The evaluation circuit EVAL-LT8390A-AZ is a synchronous 4-switch buck-boost controller featuring the LT8390A and 4 EPC GaN FETs. This circuit outputs 24V and maintains tight regulation with up to 5A load current and over an input voltage from 8V to 60V. 2MHz switching frequency provides a small footprint using a single 6mm x 6mm x 6mm inductor while maintaining high efficiency.The LT8390A features a 5V gate driver that is used to safely drive GaNFETs. Additionally, the EVAL-LT8390A-AZ board features external clamping circuitry around the bootstrap capacitors to guarantee that the gate drive of the top FETs is driven under the absolute maximum gate-to-source voltage of the GaNFET. Additionally, Schottky diodes are placed anti-parallel to the synchronous GaNFETs to help with reverse conduction during the LT8390A’s 25ns dead time.

Features

  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Up to 95% Efficiency at 2MHz
  • Proprietary Peak-Buck Peak-Boost Current Mode
  • Wide VIN Range: 4V to 60V
  • ±1.5% Output Voltage Accuracy: 1V ≤ VOUT ≤ 60V
  • ±3% Input or Output Current Accuracy with Monitor
  • Spread Spectrum Frequency Modulation for Low EMI
  • High Side PMOS Load Switch Driver
  • No Top MOSFET Refresh Noise in Buck or Boost
  • Adjustable and Synchronizable: 600kHz to 2MHz
  • VOUT Disconnected from VIN During Shutdown
  • Available in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

  • Industrial
  • Telecom Systems
  • High Frequency Battery-Powered System
  • Automotive

More information

Parts approved by Analog Devices

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Ti
Ø OD(mm)
Ø ID(mm)
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L(mm)
IR(A)
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9774010243R
SPECWA-SMSI SMT Steel Spacer with internal Thread M2, M2, 4.35 mm
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
Inner ThreadM2 
Outer Diameter4.35 mm
Inner Diameter2.8 mm
Packaging Unit1500 
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Length1 mm
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–
Operating Temperature -55 °C up to +150 °C
PackagingTape and Reel 
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60800213421
SPECWR-PHD Jumper, –, –
Availability
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Downloads3 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWR-PHD Jumper
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–
–
Packaging Unit1000 
Pins2 
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Rated Current3 A
Working Voltage200 V (AC)
Operating Temperature -25 °C up to +105 °C
PackagingBag 
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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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Order Code
Data­sheet
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Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
SamplesAvailability & Sample
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7443934650068
SPECWE-XHMI SMT Power Inductor, 0.68 µH, 40.6 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Inductance0.68 µH
Performance Rated Current40.6 A
Saturation Current @ 30%29.4 A
DC Resistance1.7 mΩ
DC Resistance2.1 mΩ
Self Resonant Frequency62 MHz
MountSMT 
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