42V, 6A Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

The LT8640S-2/LT8643S-2 synchronous step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at high switching frequencies. Peak current mode control with a 30ns minimum on-time allows high step-down ratios even at high switching frequencies. The LT8643S-2 has external compensation to enable current sharing and fast transient response at high switching frequencies.

Burst Mode operation enables ultralow standby current consumption, forced continuous mode can control frequency harmonics across the entire output load range, or spread spectrum operation can further reduce EMI emissions.

APPLICATIONS

* Automotive and Industrial Supplies

* General Purpose Step-Down

* Silent Switcher® Architecture

* Ultralow EMI Emissions

* Optional Spread Spectrum Modulation

* High Efficiency at High Frequency

* Up to 96% Efficiency at 1MHz, 12VIN to 5VOUT

* Up to 95% Efficiency at 2MHz, 12VIN to 5VOUT

* Wide Input Voltage Range: 3.4V to 42V

* 6A Maximum Continuous, 7A Peak Output

* External Compensation: Fast Transient Response and Current Sharing (LT8643S-2)

* Fast Minimum Switch On-Time: 30ns