MAX38889

• Fully integrated single-board solution for portable power and battery management
• USB-C Power Delivery (PD) input for flexible and modern power sourcing
• Single-cell (1S) Li-ion battery charger with optimized charge management
• Advanced fuel gauging, protection, and authentication for battery safety and reliability
• Multiple configurable output rails (up to 5) supporting diverse system loads
• Buck-boost and multi-phase buck regulation for efficient power conversion
• Supercapacitor-based backup power to maintain operation during power loss or battery swap
• Integrated power path management for seamless source switching
• Logic-level translation support for multi-voltage system compatibility
• Compact and scalable design suitable for space-constrained portable devices
• With MAXUSB_INTERFACE# for easy communication with a Windows PC

The ADPS40099-RD is a fully integrated battery management system reference design suitable for portable applications. It consolidates a complete power solution for handheld and portable devices, utilizing the latest components from ADI’s power portfolio.

The solution features the MAX77958 USB-C power delivery controller for flexible input options, paired with the MAX77786 1S battery charger to manage charging from a single-cell lithium-ion battery. The MAX17300 provides advanced fuel gauging, battery protection, and authentication capabilities, ensuring safe and reliable operation.

To support diverse power requirements, the design includes the MAX77857 buck-boost regulator and the MAX77542 multi-phase buck converter, enabling up to five individually configurable outputs. The design also integrates the MAX14727 for power path control. For backup power, the MAX38889 utilizes supercapacitor technology to maintain system operation during power interruptions and battery replacements. Additionally, the MAX14611 logic-level translator ensures seamless communication between components operating at different voltage levels.

This compact and cohesive single-board implementation offers a clear advantage in delivering a robust, space-efficient, and scalable battery management solution, ideal for modern portable electronic systems.

• 2.5V to 5.5V System Output Voltage Range
• 0.5V to 5.5V Supercapacitor Voltage Range
• 3A Peak Charging and Backup Inductor Currents
• Resistor-Adjustable VSYS, VCAP Voltages
• Resistor-Adjustable Charging and Backup Currents
• Proven Two-Layer, 2oz Copper PCB Layout
• Demonstrates Compact Solution Size
• Fully Assembled and Tested

The MAX38889A evaluation kit (EV kit) evaluates the MAX38889 supercapacitor backup regulator, which is designed to transfer power between a supercapacitor and a system supply rail. When the main battery is present and above the minimum system voltage for charging, the MAX38889 charges the supercapacitor with an average current of 1.5A.

Once the supercapacitor is charged, the circuit draws only 4µA of current while it maintains the supercapacitor in its ready state. When the main battery is removed, the MAX38889 draws power from the supercapacitor and regulates the system voltage to the set backup voltage with a programmed maximum peak inductor current of 3A. The MAX38889 is externally programmable for maximum supercapacitor voltage, system backup voltage, peak charging, and peak backup inductor currents.

Applications

• Aftermarket Automotive Tracking
• Handheld Industrial Equipment
• Industrial Sensor and Actuators
• Portable Devices/Computers with Removable Battery

• Enables Immediate Testing of Nine Different Power Solutions
• Includes nanoPower Buck and Boost Converters and Modules, Buck/Boost Converter, LDOs, and Continua Supercapacitor Backup Power Controller
• Boards Designed to Accept 0.100” (2.54mm) Header Pin Strips for Mounting on Breadboards
• Through Holes Accept Test Points for Connecting to Benchtop Equipment

The MAXESSENTIAL02EP Essential Analog Efficient Power toolkit delivers products on ready-to-use boards for immediate testing and prototyping. The Essential Analog Efficient Power toolkit features products from the Buck, Boost, Buck-Boost, LDO, and Continua™ product categories. The selection also features nanoPower switching converter and module options.