MAX77827 1.5A buck-boost converter extends battery life

October 03, 2019 //By Wisse Hettinga
MAX77827 1.5A buck-boost converter extends battery life
Maxim power management solution to boost runtime of Portable Devices

With a quiescent current (IQ) of 6µA, and a peak efficiency of 96% in the market, designers can now maximize a portable device’s battery life with the MAX77827 buck-boost converter from Maxim Integrated Products. This 1.5A high-efficiency, compact 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. The MAX77827 aim is to address the power requirements of low-power wide-area network (LPWAN) applications, asset tracking devices and many internet of things (IoT) applications.

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 powerrail 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.

the MAX77827 buck-boost converter 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. Compared with the current means of utilizing a bypass boost converter followed by an LDO, the MAX77827 improves efficiency by up to 12%. Compared with utilizing a buck converter, it allows continuous system operation with lower voltage from the battery to further utilize the battery capacity. The MAX77827 is the latest buck-boost converter


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