Buck-boost converter has 96 percent efficiency and 6µA quiescent current

October 03, 2019 //By Nick Flaherty
Buck-boost converter has 96 percent efficiency and 6µA quiescent current
Maxim's MAX77827 buck-boost converter is aimed at low-power wide-area network (LPWAN) applications, asset tracking devices and Internet of Things (IoT) applications

Maxim Integrated has developed a 1.5A buck-boost converter with higher efficiency and lower quiescent power for portable battery designs. A number of chip makers are pushing both efficiency and quiescent current in single chip DC-DC converter designs. 

The MAX77827 buck-boost converter allows 1.8V to 5.5V input and 2.3V to 5.3V output, while providing the system stability needed to minimize abrupt or unexpected shutdowns. It is aimed at low-power wide-area network (LPWAN) applications, asset tracking devices and many internet of things (IoT) applications with an 96 percent efficiency and 6µA quiescent current.

The growing lithium-ion battery market is largely driven by an increasing inclination towards smart electronic devices with expanding functionalities packed within. Primary cell batteries based on Lithium Thionyl Chloride (Li-SOCl2) chemistry or dual-cell Alkaline (AA or AAA) with operations as low as 1.8V is also gaining popularity in the long-life portable market segment. However, regardless of the types of batteries used, these devices will discharge through a wide range of voltages while sustaining a power rail between 2.8V to 3.8V, specifically for powering MCU, Wi-Fi, BLE and GPS features. The traditional buck or bypass boost plus low dropout (LDO) topologies are not ideal solutions for these sophisticated devices because they are not the most efficient at prolonging battery life. Additionally, a simple buck converter topology may cause earlier system shutdown when battery voltage is high to maintain the required power for the aforementioned applications, leaving underutilized battery capacity.

With the lowest quiescent current in the market, highest efficiency gains and small solution size, the MAX77827 buck-boost converter sets the standard for maximizing battery life. It is an ideal solution to support applications with low power requirements because, regardless of the battery voltage variations, it can automatically transition between buck and boost modes to provide a consistent output power supply.

Next: Buck-boost converter comparisons


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