Analog Devices Inc. EVAL-LT8645SA-AZ Evaluation Board
Analog Devices EVAL-LT8645SA-AZ Evaluation Board is designed to showcase the performance of the LT8645SA, a 65V, 8A synchronous step-down regulator featuring Silent Switcher® 2 architecture. This advanced design minimizes EMI emissions while delivering high efficiency and fast transient response. The ADI EVAL-LT8645SA-AZ board supports an input voltage range from 5.6V to 65V and provides a fixed 5V output with up to 8A of current. The board offers a programmable switching frequency between 200kHz and 2.2MHz, with a default setting of 2MHz, and includes selectable operating modes such as Burst Mode® for ultra-low quiescent current, Forced Continuous Mode, and Spread Spectrum Mode for enhanced EMI performance.
The EVAL-LT8645SA-AZ also features SYNC capability for external clock synchronization and a minimum on-time of 40ns, enabling high VIN-to-low VOUT conversion at high frequencies. With efficiency up to 94% and compliance with CISPR25 Class 5 EMI standards, this board is ideal for automotive, industrial, and general-purpose DC/DC step-down applications. It comes fully assembled and tested, including an onboard EMI filter that can be bypassed for evaluation purposes.
Features
- 65V, 8A synchronous step-down second-generation Silent Switcher with spread-spectrum frequency modulation
- Buck (step-down) topology
- 5.6V to 65V input power supply range with onboard EMI filter, passes CISPR25 Class 5 peak limits
- 4.85V to 5.15V output voltage range, 5V typical
- 8A (minimum) maximum output current
- 1.85MHz to 2.15MHz switching frequency range, 2MHz typical
- 93% typical efficiency
- SYNC capability - can synchronize to an external clock via the SYNC pin
- Selectable modes
- Burst Mode for ultralow quiescent current and high efficiency at light loads
- Forced Continuous Mode (FCM)
- Spread Spectrum Mode for improved EMI/EMC performance
- 40ns minimum on-time enabling high VIN-to-low VOUT conversion at high frequency
- Includes exposed pads for low thermal resistance, derating required for high input voltage and thermal conditions
Applications
- Automotive
- Automotive always-on systems
- Automotive cold-crank
- Automated test equipment
- Distributed supply regulation
- Industrial
- Test and measurement
- Medical equipment
- Signal processing applications
- Imaging and RF systems
Measurement Equipment Setup
Related Regulators
Analog Devices Inc. Silent Switcher® Solutions for EMI Compliance
Delivers up to 95% efficiency at 2MHz with ultra-low EMI/EMC emissions.