Analog Devices Announces 80V Buck-Boost Battery Charging Controller with Maximum Power Point Tracking and I2C

By Tiera Oliver

Assistant Editor

Embedded Computing Design

January 18, 2021

News

Analog Devices introduced the LT8491 buck-boost battery charging controller featuring Maximum Power Point Tracking (MPPT), temperature compensation, and I2C interface for telemetry and control.

Analog Devices introduced the LT8491 buck-boost battery charging controller featuring Maximum Power Point Tracking (MPPT), temperature compensation, and I2C interface for telemetry and control.

The device operates from input voltages above, below, or equal to the regulated battery float voltage. The LT8491 offers three selectable Constant Current Constant Voltage (CC-CV) charging profiles, making it ideal for charging a variety of battery chemistry types including sealed lead acid, gel and flooded cells, and Li-Ion. All charge termination algorithms are provided onboard, eliminating the need for software or firmware and thus reducing design cycle time. 

The LT8491 operates over a 6V to 80V input range and can produce a 1.3V to 80V battery float voltage output using a single inductor with 4-switch synchronous rectification. The device is capable of charging currents as high as 10A depending on the choice of external components. The LT8491 may be paralleled with multiple LT8705 (80V buck-boost controller) devices for higher power operation. 

The LT8491 can do a sweep of the full operating range of a solar panel, finding the true maximum power point, even in the presence of local maxima points caused by partial shading of the panel. Once the true maximum power point is found, the LT8491 will operate at that point while using a dithering technique to track slow changes in the maximum point.  By using these methods, the LT8491 can utilize nearly all the power generated by a solar panel even in non-ideal operating environments.

The LT8491 can perform automatic temperature compensation by sensing an external thermistor thermally coupled to the battery. The I2C interface provides complete control of the charger as well as input/output voltage, current, and power values. The LT8491 is available in a low profile (0.75mm) 64-pin 7mm x 11mm QFN package and is guaranteed for operation from -40°C to 125°C.  

LT8491 Key Features

  • VIN Range: 6V to 80V
  • VBAT Range: 1.3V to 80V
  • Single Inductor Allows VIN Above, Below, or Equal to VBAT
  • Automatic MPPT for Solar Powered Charging
  • Automatic Temperature Compensation
  • I2C Telemetry and Configuration
  • Internal EEPROM for Configuration Storage
  • Operation from Solar Panel or DC Supply
  • Four Integrated Feedback Loops

Pricing and Availability 

Download data sheet and Linduino I2C Interface, order samples and evaluation boards at. Connect with engineers and ADI product experts on EngineerZone, an online technical support community: http://ez.analog.com/power.

For more information, visit: http://www.analog.com

Featured Companies

Analog Devices

One Technology Way
Norwood, MA 02062

Tiera Oliver, Assistant Editor for Embedded Computing Design, is responsible for web content edits and constructing stories. She also assists with newsletter updates as well as contributing and editing content for ECD podcasts and the ECD YouTube channel. Before working at ECD, Tiera graduated from Northern Arizona University where she received her B.S. in journalism and political science and worked as a news reporter for the university’s student led newspaper, The Lumberjack.

More from Tiera