Analog Devices LT8390 | Demoboard DC2825A

Description

Demonstration circuit 2825A is a 4-switch synchronous buck-boost regulator that demonstrates the medium power capability of the LT®8390. The output is 12V and the maximum output current is 10A for up to 120W power delivery. The switching frequency is 300kHz and efficiency can exceed 96%.The steady-state operating input voltage range of DC2825A in which the temperature of the components is less than 90°C is from 9V to 22V. The transient operating input voltage range of DC2825A is from 7V to 36V. The output voltage and EN/UVLO are all programmed by resistor dividers. EN/UVLO is set so the circuit will turn off when the input voltage falls below 7V and will turn on when the input voltage rises above 8V.DC2825A features MOSFETs that complement the 5V gate drive of the LT8390 to achieve high efficiency. 40V AEC-Q101 MOSFETs are used on the input and output side of the 4-switch topology. Ceramic capacitors are used at both the circuit input and output because of their small size and high ripple current capability. In addition to ceramic capacitors, there are hybrid polymer aluminum electrolytic capacitors at the input and output to mitigate the effects of the input and output transients.The PCB has large copper planes and extensive vias for excellent high power thermal performance. There are fourmounting holes on the board for optional heat sink and fan, which can push the output power of DC2825A up to 180W. For more details, please consult the factory for assistance.

Features

• 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
• Synchronous Switching: Up to 98% Efficiency
• 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
• Integrated Bootstrap Diodes
• No Top MOSFET Refresh Noise in Buck or Boost
• Adjustable and Synchronizable: 150kHz to 650kHz
• 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

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

More information

• Datasheet
• IC product information