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True Wireless Stereo (TWS) Earbud Charger Cradle

Overview

This True Wireless Stereo (TWS) and hearing aid earbud charger cradle/box design integrates USB-C, USB-A, and wireless power input paths with an optimized charger power management IC (PMIC). The PMIC combines a DC/DC buck charger, reverse boost function, and two LDOs to provide individually controlled voltage levels to the earbuds. Optional UART-based power line communication (PLC) enables charging voltage control and communication of SoC/SoH information.

System Benefits​:

  • Highly integrated design requiring minimal discrete components
  • USB BC 1.2 support for enhanced compatibility
  • PLC reduces the number of pins between the cradle and earbuds
  • Supports up to 2A battery charging capability
  • Reverse boost function with up to 700mA output
  • Charger PMIC with ultra-low 0.1µA leakage in ship mode
  • Optional Bluetooth® Low Energy connectivity for added functionality

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4:3 ratioSheet.220Sheet.1Sheet.2Sheet.3Sheet.4EU089EU089EU089Inductor Iron CoreLine.841Inductor Air Core.212Sheet.17Sheet.18Sheet.19Sheet.20Sheet.21Sheet.22Sheet.23Sheet.24Sheet.25Line.29Inductor Iron Core.27Line.841Inductor Air Core.212Sheet.30Sheet.31Sheet.32Sheet.33Sheet.34Sheet.35Sheet.36Sheet.37Sheet.38Line.29ShuntSheet.61Sheet.62Sheet.63Sheet.65Sheet.66Sheet.67Sheet.69Sheet.76Label Text 10pt.254++Label Text 10pt.255--Sheet.79Line 1pt.1552Line 1pt.1583Sheet.82Sheet.109Sheet.110Darlington.111Sheet.112Sheet.113Darlington.254Sheet.115Sheet.116Darlington.254Sheet.118Sheet.119Sheet.120Non-Electric CapSheet.135Sheet.136Sheet.137Sheet.138Sheet.139USB-CUSB-CUSB-CUSB-CSheet.142Sheet.143Sheet.144Sheet.145Sheet.146Sheet.147Sheet.148Sheet.149Sheet.150Sheet.151Sheet.152Sheet.153Sheet.154Inductor Coreless (Air conductor)Sheet.170Sheet.171Sheet.172Sheet.173Sheet.174Sheet.175Sheet.176Sheet.177Sheet.178USB2Sheet.182DP/DMDP/DMDP/DMSheet.187Sheet.188Sheet.189Sheet.190VBUSVBUSVBUSSheet.1925V (5W)5V (5W)5V (5W)OptionalOptionalOptionalSheet.195Sheet.196Sheet.197Sheet.198Sheet.199Sheet.201Sheet.202Sheet.203Sheet.204Sheet.207Sheet.208Sheet.211Sheet.212Sheet.213Connector 1Sheet.215Sheet.216Connector 1.217Sheet.219Sheet.221Sheet.229Sheet.230Sheet.231WakeupWakeupWakeupSheet.233Sheet.234Sheet.235Sheet.236Sheet.237Sheet.238Sheet.239Sheet.240Sheet.241Sheet.243Sheet.85Sheet.86Sheet.242VBATVBATVBATSheet.253Sheet.254Sheet.256Sheet.257Sheet.258Sheet.259Sheet.260Sheet.261Sheet.262Sheet.263Connector 1.264Sheet.265RX/TXRX/TXRX/TXVsys/VBATVsys/ VBATVsys/VBATCh1/2Ch1/2Ch1/2EarbudsEarbudsEarbudsConnector 1.270Connector 1.271OptionalOptionalOptionalSheet.273Sheet.274Connector 1.275Sheet.277Sheet.278Darlington.131Sheet.280Sheet.281Darlington.254Sheet.283Sheet.284Darlington.254Sheet.287Sheet.288Darlington.289Sheet.290Sheet.291Darlington.254Sheet.293Sheet.294Darlington.254Sheet.297Sheet.298Darlington.299Sheet.300Sheet.301Darlington.254Sheet.303Sheet.304Darlington.254DP/DM.306USB2USB2MCU 16bitMCU 16bitMCU 16bitMCU 16bitUSB2.0 BC1.2USB2.0 BC1.2USB2.0 BC1.2GPIOsGPIOsGPIOsI2C MasterI2C MasterI2C MasterGPIOsGPIOsGPIOsADCADCADCUARTUARTUARTCharger PMIC wth Boost + LDOCharger PMIC with Boost + 2x LDOCharger PMIC with Boost + 2x LDOCharger PMIC with Boost + 2x LDOVsysVsysVsys I2CI2CI2CRIN/NRIN/NRIN/NBoostBoostBoostLDOLDOLDOLDOLDOLDOBuck ChargerBuck ChargerBuck ChargerVinVinVinDual Input Single Output MuxDual Input Single Output MuxDual Input Single Output MuxBluetooth Low EnergyBluetooth Low EnergyBluetooth Low EnergyDC/DC BuckDC/DC BuckDC/DC BuckDC-PLCDC-PLCDC-PLCWireless Power RXWireless Power RX (WPC/Qi)Wireless Power RX (WPC/Qi)Wireless Power RX (WPC/Qi)I2CI2CI2C

MCU

RL78 Low-Power 8 & 16-Bit MCUs

Bluetooth Low Energy

Bluetooth Low Energy

DC/DC Buck

Buck Regulators (Integrated FETs)

DC-PLC

Other GreenPAKs

Charger PMIC with Boost + 2x LDO

Battery Charger ICs

Dual Input Single Output Mux

Load Switches

News & Blog Posts

Blog Post
May 21, 2022
True Wireless Stereo (TWS) Earbud Charger Cradle

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