Analog Devices LT8646S | Demoboard DC2660A

Description

Demonstration circuit 2660A is a 65V, 8A synchronous step-down second generation Silent Switcher® with spread spectrum frequency modulation featuring the LT®8646S. The demo board is designed for 5V output from a 5.6V to 65V input. The wide input range allows a variety of input sources, such as automotive batteries and industrial supplies. The LT8646S is a compact, ultralow emission, high efficiency, and high speed synchronous monolithic step-down switching regulator. The integrated bypass capacitors optimize all the fast currentloops and make it easier to minimize EMI/EMC emissions by reducing layout sensitivity. Selectable spread spectrum mode can further improve EMI/EMC performance. Fastminimum on-time of 40ns enables high VIN to low VOUT conversion at high frequency.

Features

• Silent Switcher®2 Architecture
• Ultralow EMI/EMC Emissions on Any PCB
• Eliminates PCB Layout Sensitivity
• Internal Bypass Capacitors Reduce Radiated EMI
• Optional Spread Spectrum Modulation
• High Efficiency at High Frequency
• Up to 95% Efficiency at 1MHz, 12VIN to 5VOUT
• Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT
• Wide Input Voltage Range: 3.4V to 65V
• Ultralow Quiescent Current Burst Mode Operation
• 2.5A IQ Regulating 12VIN to 3.3VOUT (LT8645S)
• Output Ripple < 10mVP-P
• External Compensation: Fast Transient Response and Current Sharing (LT8646S)
• Fast Minimum Switch On-Time: 40ns
• Low Dropout Under All Conditions: 60mV at 1A
• Adjustable and Synchronizable: 200kHz to 2.2MHz
• Peak Current Mode Operation
• Output Soft-Start and Tracking
• Small 32-Lead 6mm × 4mm LQFN Package

Typical applications

• General Purpose Step-Down
• GSM Power Supplies
• Automotive and Industrial Supplies

More information

• Datasheet
• IC product information