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NVDC Buck Charger Use Case: Smart Home Devices

USE CASE

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This use case considers the application of MPS’s highly integrated, narrow-voltage DC (NVDC) buck chargers in smart home devices.

With the increasing availability of wireless home appliances, smart homes are on the rise, integrating various connected devices (e.g. smart thermostats, alarms, smart speakers, and doorbells, as well as connected cameras) across automation, monitoring, and energy management functions. These devices are controlled and regulated from a centralized system, where it is important to maintain a constant power supply.

A battery pack is typically embedded in connected smart home devices. Otherwise, a backup battery is used in the case of AC power failure. If the battery becomes completely discharged, an input source is plugged in to supply power to the centralized system immediately. USB Type-C compliant chargers are commonly used in smart home devices.

The MP2722 is a 5A, USB Type-C 1.3 compliant, switch-mode battery charger that is designed for single-cell Li-ion or Li-polymer batteries. If the input source is connected and the system voltage (VSYS) drops below the battery voltage (VBATT), meaning the system is heavily loaded, the MP2722 offers supplement mode to enable the buck converter and battery to provide power to the system. The MP2722 also integrates a configuration channel (CC) controller and USB BC1.2, which simplifies application design.

Overall, the MP2722’s low-impedance power path optimizes battery charging efficiency as well as battery life during discharging.

Overall, the MP2722’s low-impedance power path optimizes battery charging efficiency as well as battery life during discharging. The MP2722 is available in a small QFN-22 (2.5mmx3.5mm) package.

Additional features include:


  • Fully Integrated CC Controller with Dual-Role Power (DRP) Mode and Autonomous or Manual Mode
  • Try.SNK and Try.SRC Mode Support
  • Supports USB BC1.2 and Non-Standard Adapters
  • 26V Sustainable Input Voltage (VIN)
  • Configurable 80mA to 5A Charge Current (ICC) via the Serial Interface
  • Configurable 100mA to 3.2A Input Current Limit (IIN_LIM) via the Serial Interface
  • Minimum VIN Loop for Maximum Adapter Power Tracking
  • Comprehensive Safety Features:
    • Fully Customizable JEITA Profile
    • Additional Negative Temperature Coefficient (NTC) Thermistor Input
    • Configurable Die Temperature Regulation from 60°C to 120°C
    • Watchdog Safety Timer
    • Lockable Registers for Charging Parameters
  • Configurable 750kHz to 1.5MHz Switching Frequency (fSW)
  • Integrated 15mΩ Low On Resistance (RDS(ON)) Battery MOSFET with Shipping Mode and Reset Mode
  • Ultra-Low 8.5μA Battery Discharge Current in Shipping Mode
  • Down to 30mA Termination Current Settings for Wearable Applications
  • Serial Interface Port for Flexible System Parameter Setting and Status Reporting
  • Configurable Boost Converter for Source Mode and USB On-The-Go (OTG):
    • Configurable Output Current (IOUT) Limit Loop Up to 3A
    • Output Over-Current Protection (OCP)
    • Ability to Power Large Capacitive Loads Up to 2mF
    • Configurable 5V to 5.35V Output Voltage (VOUT)
  • Accuracy:
    • ±0.5% Battery Float Voltage Regulation (VBATT_REG)
    • ±5% ICC
    • ±5% IIN_LIM
    • Remote Battery Sensing for Fast Charging
    • ±2% Output Regulation in Boost Mode

For more information, explore MPS's selection of single series cell chargers.

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