DESCRIPTION
The MPQ28164 is a high-efficiency, lowquiescent current, buck-boost converter that operates from an input voltage above, equal to, or below the output voltage. The MPQ28164 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 2MHz 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-kipping
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 MPQ28164 operates with an input voltage from 1.2V to 5.5V to provide an adjustable output voltage from 1.5V to 5V. With an input from 2.5V to 5.5V, the device can supply 2A of current to the load with a 3.3V output voltage.
The MPQ28164 is available in a small QFN-11 2mmx3mm) package.

FEATURES
 1.8V Minimum Start-Up Input Voltage
 1.2V to 5.5V Input Work Range
 1.5V to 5V Output Range
 4.2A Switching Current Limit
 3.3V/2A Load Capability from a 2.5V to 5.5V Input Supply
 2MHz Fixed or External Synchronous Switching Frequency
 Selectable PSM and PWM Mode
 Typical 25μA Quiescent Current
 High Efficiency up to 95%
 Load Disconnect during Shutdown
 Internal Soft Start (SS) and Compensation
 Power Good Indicator
 Hiccup Mode for Short-Circuit Protection (SCP)
 Over-Temperature Protection (OTP)
 Available in a Small QFN-11 (2mmx3mm) Package

APPLICATIONS
 Battery-Powered Devices
 Portable Instruments
 Tablet PCs
 Super-Cap Chargers