Analog Devices LT8642-1 | Demoboard DC3162A

Description

Demonstration circuit 3162A is a 18V, 10A synchronous step-down Silent Switcher® with spread spectrum frequency modulation featuring the LT®8642-1. The demo board is designed for 1.2V output from a 2.8V to 18V input. The LT8642-1 is a compact, low emission, high efficiency, and high speed synchronous monolithic stepdown switching regulator. Special Silent Switcher architecture minimizes EMI emissions. Selectable spread spectrum mode can further improve EMI performance. Fast minimum on-time of 20ns enables high VIN to low VOUT conversion at high frequency.The LT8642-1 switching frequency can be programmed either via a resistor or external clock over a 200kHz to 3MHz range. The default frequency of demo circuit 3162A is 2MHz. The LT8642-1 SYNC/MODE pin on the demo board is grounded (JP1 at BURST position) by default for low ripple Burst Mode® operation. Spread spectrum mode and forced continuous mode can be selected respectively by moving JP1 shunt. To synchronize to an external clock, move JP1 to FCM/SYNC and apply the external clock to the SYNC terminal.

Features

• Silent Switcher® Architecture
• Ultralow EMI Emissions
• Optional Spread Spectrum Modulation
• High Efficiency at High Frequency
• Up to 96% Efficiency at 1MHz, 12VIN to 3.3VOUT
• Up to 95% Efficiency at 2MHz, 12VIN to 3.3VOUT
• Wide Input Voltage Range: 2.8V to 18V
• 10A Output Current
• External Compensation: Fast Transient Response and Current Sharing
• Low Quiescent Current Burst Mode® Operation
• 240µA IQ Regulating 12VIN to 1.2VOUT
• Output Ripple: <10mVP-P
• Fast Minimum Switch On-Time: 20ns
• Low Dropout Under All Conditions: 50mV at 1A
• Forced Continuous Mode
• Adjustable and Synchronizable: 200kHz to 3MHz
• Output Soft-Start and Power Good
• Small 20-Lead 3mm × 4mm LQFN Package

Typical applications

• Automotive and Industrial Supplies, Server Power Applications

More information

• Datasheet
• IC product information