MPQ2166B Synchronous Step-down Regulators Monolithic Power Systems (MPS) MPQ2166B Synchronous Step-down Regulators are internally compensated, dual, and pulse-width modulated buck converters in QFN-18 packages. These step-down regulators operate from a 2.7V to 6V input voltage (VIN) range and generate an output voltage (VOUT) as low as 0.6V. The MPQ2166B regulators integrate dual, 55mΩ, high-side MOSFETs (HS-FETs) and 20mΩ synchronous rectifiers to achieve high efficiency without external Schottky diodes. These synchronous step-down regulators are ideal for a wide range of applications, including automotive infotainment, clusters, telematics, battery-powered devices, and portable instruments.