MP266x family of linear chargers

MP2661 - 4.65V System, 500mA,I2C-Controlled Battery Charger with Power Path Management for Single-Cell Li-Ion Battery

The MP2661 is a highly integrated, single-cell, lithium-ion (Li-ion) and lithium-polymer (Li-polymer) battery charger with system power path management for space-limited, portable applications. The MP2661 uses input power from either an AC adapter or a USB port to supply the system load and charge the battery independently. The charger features constant current pre-charge (PRE.C), constant current (CC) fast charge, and constant voltage (CV) regulation, charge termination, and auto-recharge.

The power path management function ensures continuous power to the system by automatically selecting the input, the battery, or both to power the system. This power stage features a low dropout regulator from the input to the system and a 100mΩ switch from the battery to the system. Power path management separates the charging current from the system load, which allows for proper charge termination and keeps the battery in full-charge mode.

The MP2661 provides short-circuit protection (SCP) by limiting the current from the input to the system, and the battery to the system. SCP protects the Li-ion battery from being damaged by excessively high currents. If the battery voltage (VBATT) drops below its configurable under-voltage lockout (UVLO) threshold, then the path between the battery and the system is cut off to prevent the Li-ion battery from being over-discharged. An integrated I2C control interface allows the MP2661 to program the charging parameters, such as the input current limit (IIN_LIM), minimum input voltage (VIN_MIN) regulation, charging current, battery regulation voltage, safety timer, and battery UVLO.

The MP2661 is available in a WLCSP-9 (1.55mmx1.55mm) package.

Features

• Fully Autonomous Charger for Single-Cell Li‑Ion/Li-Polymer Batteries
• Complete Power Path Management for Simultaneously Powering the System and Charging theBattery
• ±0.5% Charging Voltage Accuracy
• 13V Maximum Voltage for the Input Source
• I2C Interface for Setting Charging Parameters and Status Reporting
• Fully Integrated Power Switches and No External Blocking Diode Required
• Built-In Robust Charging Protection Including Battery Temperature Monitoring and Programmable Timer
• PCB Over-Temperature Protection (PCB_OTP)
• System Reset Function
• Built-In Battery Disconnection Function
• Thermal Limiting Regulation On-Chip
• Available in a WCSP-9 (1.55mmx1.55mm) Package

Applications

• Smart wearable
• Smart tracker
• E-bike
• E-Scooter

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