Analog Devices LT8390A | Demoboard EVAL-LT8390A-AZ

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

More information

• Datasheet
• IC product information