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Monolithic Power Systems (MPS) MP2665A Single-Cell Li-Ion Charger

Monolithic Power Systems (MPS) MP2665A Single-Cell Li-Ion Battery Charger is a highly integrated, single-cell Li-ion and Li-polymer battery charger with system power path management. The MP2665A is ideal for space-constrained portable applications. The device takes input power from either an AC adapter or a USB port to supply the system load and charge the battery simultaneously. The MP2665A Charger features pre-charge, constant current (CC) fast charge, constant voltage (CV) regulation, charge termination, and auto-recharge.

The power path management feature of the MP2665A ensures that the system is continuously powered by automatically selecting the input, the battery, or both to power the system. Power path management is accomplished using a low-dropout (LDO) regulator connected from the input to the system and a 100mΩ switch connected from the battery to the system. This function separates the charging current from the system load, which allows for proper charge termination and keeps the battery in full charge mode.

The MP2665A provides system short-circuit protection (SCP) by limiting the current from the input to the system and the current from the battery to the system. This feature prevents the Li-ion battery from being damaged due to excessively high currents. Battery under-voltage lockout (UVLO) protection blocks the path between the battery and the system if the battery voltage drops below the configurable UVLO threshold. This feature prevents the Li-ion battery from being discharged excessively. The integrated I2C interface can configure the charging parameters, including input current limit, input voltage (VIN) regulation limit, charge current, battery regulation voltage, safety timer, and battery UVLO threshold.

The Monolithic Power Systems (MPS) MP2665A Single-Cell Li-Ion Battery Charger is available in a compact 2.5mm x 3.0mm QFN-12 package.

Features

  • USB-compliant, I2C-configurable charger for single-cell Li-ion and Li-polymer batteries
  • 21V maximum input voltage rating with over-voltage protection (OVP)
  • Complete power path management to simultaneously power the system and charge the battery
  • Fully configurable charging parameters
    • 50mA to 1A input current limit
    • 3.88V to 5.08V input voltage loop to support weak adapters
    • ±0.5% charging termination voltage accuracy
    • 16mA to 896mA fast charge current
    • 2.5mA to 62mA pre-charge and termination current
  • I2C interface to set charging parameters and report INT/statuses
  • Ultra-low battery leakage current in shipping mode
  • Robust safety features
    • Built-in charging protections, including battery temperature monitoring and configurable timer
    • Configurable thermal regulation
    • Configurable watchdog timer
    • PCB over-temperature protection
    • Configurable over-discharge current protection
  • System reset function
  • OTP back registers to set default power- on configuration
  • 2.5mm x 3.0mm QFN-12 package

Applications

  • Wearable devices
  • Smart handheld devices
  • Fitness accessories
  • Smartwatches

Development Tools

Monolithic Power Systems (MPS) EV2665A-QB-00A Evaluation Board

Demonstration and development platform for the MP2665A Single-Cell Li-Ion Battery Charger.

Learn Moreabout Monolithic Power Systems (MPS) EV2665A-QB-00A Evaluation Board View Productsrelated to Monolithic Power Systems (MPS) EV2665A-QB-00A Evaluation Board

Typical Application Circuit

Application Circuit Diagram - Monolithic Power Systems (MPS) MP2665A Single-Cell Li-Ion Charger

Block Diagram

Block Diagram - Monolithic Power Systems (MPS) MP2665A Single-Cell Li-Ion Charger

Package Outline

Mechanical Drawing - Monolithic Power Systems (MPS) MP2665A Single-Cell Li-Ion Charger
Published: 2022-08-23 | Updated: 2022-11-10