The LT8640HUDC#PBF is an adjustable output, constant frequency, synchronous step down silent switcher in 18 pin QFN package. This monolithic ultralow noise current mode step down regulator has silent switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. The monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with minimal PCB footprint. An ultralow 2.5μA quiescent current with output in full regulation enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load from zero to full current. Operation is safe in overload even with saturated inductor. The SYNC/MODE pin selects between burst mode operation, spread spectrum mode, synchronization to an external clock and works with pulse skipping mode.
Up to 96% efficiency at 1MHz and up to 95% efficiency at 2MHz
Wide input voltage range from 3.4V to 42V
5A maximum continuous output and 7A peak transient output
Adjustable output voltage range from 970mV to 41.9V
Low dropout of 100mV at 1A under all conditions
Oscillator frequency of 2MHz at RT=18.2Kohm and ILOAD=1A
Adjustable and synchronized from 200KHz to 3MHz
Output soft start and tracking
Fast minimum switch-on time of 35ns
Operating junction temperature range from -40°C to 150°C
(EN)
