MP2661 500mA I2C-Controlled Battery Charger WLCSP-9

MP2661 500mA I2C-Controlled Battery Charger WLCSP-9

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.

Key Specifications

Features

• Fully Autonomous Charger for Single-Cell Li-Ion and Li-Polymer Batteries
• Complete Power Path Management for Simultaneously Powering the System and Charging the Battery
• ±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
• Integrated Battery Disconnect Function

Typical Application Circuit

Applications

• Wearable Devices
• Smart Handheld Devices
• Fitness Accessories

Design Notes

• Charge current accuracy depends on the sense resistor tolerance, so use a 1% or better part and keep its traces Kelvin-connected.
• Wire the NTC input for JEITA profile control if the pack is charged over temperature.
• Set the input current limit to what the adapter can actually deliver; a limit above the adapter rating causes the input rail to collapse mid-charge.
• Termination current and recharge threshold dominate cycle life in shallow-cycling products.

Common Questions