MPQ28164 Buck-Boost Converter

 The MPQ28164 from Monolithic Power Systems is a high-efficiency, low quiescent current, buck-boost converter that operates from an input voltage above, equal to, or below the output voltage. The device provides a compact solution for products powered by one-cell Lithium-ion or multi-cell alkaline batteries where the output voltage is within the battery voltage range. The MPQ28164 uses current-mode control with a fixed PWM frequency for optimal stability and transient response. The fixed 2 MHz switching frequency and integrated low RDS(ON) MOSFETs minimize the solution footprint while maintaining high efficiency. To ensure the longest possible battery life, the MPQ28164 uses an optional pulse-skipping mode that reduces the switching frequency under light-load conditions. For other low-noise applications where pulse-skipping mode may cause interference, a high-logic input on the MODE/SYNC pin guarantees fixed-frequency PWM operation under all load conditions. The device operates with an input voltage from 1.2 V to 5.5 V to provide an adjustable output voltage from 1.5 V to 5 V. With input from 2.5 V to 5.5 V, the device can supply 2 A of current to the load with a 3.3 V output voltage and is available in a small QFN-11 (2 mm x 3 mm) package.