High-Efficiency, Single-Inductor, Buck-Boost Converter with 4.2A Switches

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The MP28164 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 MP28164 uses current-mode control with 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 MP28164 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 MODE/SYNC guarantees fixed-frequency PWM operation under all load conditions.

The MP28164 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 MP28164 is available in a small QFN-11 (2mmx3mm) package.

Symmetry Electronics is an authorized Monolithic Power Systems distributor.


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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/PWM Mode
Typical 25A Quiescent Current
High Efficiency up to 95%
Load Disconnect during Shutdown
Internal Soft Start and Compensation
Power Good Indicator
Hiccup Mode for Short-Circuit Protection (SCP)
Over-Temperature Protection (OTP)
Available in a Small QFN-11 (2mmx3mm) Package


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Monolithic Power Systems Datasheet

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