Synchronous step-down silent switchers suitable for automotive and industrial supplies

Linear Technology LT86xx synchronous step-down regulators feature Silent Switcher architecture designed to minimise EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. They are available now from Mouser. They are offered in a 3mm × 4mm QFN package, the monolithic construction with integrated power switches and all necessary circuitry yields a solution with a minimal PCB footprint. An ultra-low 2.5µA quiescent current allows applications requiring highest efficiency very small load currents. Transient response stays excellent, and output voltage ripple is below 10mVP-P at any load, from zero to full current. The devices allow high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 30ns to 35ns. The operation is safe in overload even with a saturated inductor. Essential features are included and easy to use. An open drain PG pin signals when the output is in regulation. Soft-start and tracking functionality is accessed through the TR/SS pin. An accurate enable threshold can be set with the EN/UV pin, and a resistor at the RT pin programs switch frequency.