MAX17055EWL+T

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Power management integrated circuits (PMICs) are specialized integrated circuits used to provide power supply, voltage regulation, and current management. PMICs are used in a wide range of products, including tablets and smartphones, wearable electronics, and industrial equipment. The MAX17055EWL+T is a battery charger, fuel gauge, and power supply (active balancing) controller that simplifies the design of energy systems used in portable applications running on single- or multiple-cell battery packs. In this article, we will review the application fields and working principles of the MAX17055EWL+T.

Applications

The MAX17055EWL+T is designed for use in portable applications powered by single- or multiple-cell Lithium-ion (Li+) battery packs. It is especially suited for applications such as laptop computers, medical devices, mobile phones, tablet computers, and IoT devices. The integrated battery charger, fuel gauge, and active balancing controller make the MAX17055EWL+T well-suited for portable designs where space and cost are critical.

The MAX17055EWL+T adopts an innovative architecture consisting of independent charge and fuel-gauge (FG) blocks. This allows simultaneous and independent operation of the charge and fuel-gauge functions, thus eliminating the need for a traditional 8-pin battery coupler and associated charge/FG switch.

In addition, the MAX17055EWL+T operates as an active balancer controller between cells in the battery stack, thus eliminating the need for an external passive balancing circuit.

Features

The MAX17055EWL+T integrates a complete suite of features that enable the design of smart, space-constrained methods for charging, fuel gauging, and active balancing. The features include:

• A USB or wall adapter charger controller that conforms to USB-IF Battery Charging 1.2 specification.
• A programmable charge current up to 2A and charge termination current as low as 10mA.
• A programmable 6-bit interface providing comprehensive communications between host and charger.
• An internal PRECHRG algorithm with a programmable precharge threshold.
• A fuel gauge (FG) block managed by an innovative ModelGauge m5 algorithm.
• An active-balancing controller, providing up to 16-cell support and optimized for maximized cell-voltage balance.

Working Principle

The working principle of the MAX17055EWL+T involves the use of an integrated charge and fuel-gauge (FG) block and an active-balancing controller. The charger block is responsible for monitoring and controlling the charge of the battery or battery pack in accordance with the specification of the input charger or power supply. The FG block monitors and records battery status throughout its charge cycle.

The active-balancing controller continuously balances the cells within the battery pack while the battery is charging, thus maximizing cell-voltage balance across an array of cells and preventing overcharging of any single cell.

The MAX17055EWL+T is controlled via an integrated 6-bit serial interface that provides a convenient means to communicate between the battery system and the host.

Conclusion

The MAX17055EWL+T provides an integrated and flexible solution for portable applications powered by single- or multiple-cell battery packs. With its integrated charger, fuel gauge, and active balancing controller, it simplifies the design of energy systems for portable applications. The device is well suited for applications such as laptop computers, medical devices, mobile phones, tablet computers, and IoT devices, where space and cost are critical.

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