42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5μA Quiescent Current

The LT8640A step-down regulator features Silent Switcher architecture designed to minimize EMI emissions while delivering high efficiency at frequencies up to 3MHz. An ultralow 2.5μA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents.

The LT8640A allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns. The SYNC/MODE pin selects between Burst Mode operation, spread spectrum mode, synchronization to an external clock, and forced continuous mode.

Applications

* Automotive and Industrial Supplies

* General Purpose Step-Down

* Silent Switcher® Architecture

* Ultralow EMI Emissions

* Spread Spectrum Frequency 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

* 5A Maximum Continuous, 8A Peak Transient Output

* Ultralow Quiescent Current Burst Mode® Operation

* 2.5μA IQ Regulating 12VIN to 3.3VOUT

* Output Ripple < 10mVP-P