Wireless Earbuds

Wireless Earbuds

Such as low power consumption and miniaturization are important in designing wireless earbuds. Toshiba provides information on a wide range of semiconductor products suitable for power supply/power supply management units, surge/ESD protection circuit units, etc., along with circuit configuration examples.

Overall block diagram

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 Charging Terminal Left Charging TerminalLeft Charging Terminal Right Charging TerminalRight USB Connector USBConnector Charger / Power Path Management IC Charger / Power PathManagement IC DC-DC DC-DC MOSFET MOSFET MOSFET MOSFET Battery Battery Battery Protection Circuit BatteryProtectionCircuit USB Controller IC USB Controller IC Protection Protection Protection Protection Protection Protection Charging Terminal Charging Terminal Antenna Antenna Speaker Speaker Microphone Microphone LDO LDO Audio IC (Charger + Bluetooth®) Audio IC(Charger + Bluetooth®) Battery Battery Battery Protection Circuit BatteryProtection Circuit Flash Memory FlashMemory Acceleration Sensor Acceleration Sensor Button Controller ButtonController Protection Protection Protection Protection TVS TVS Charging Terminal Charging Terminal Antenna Antenna Speaker Speaker Microphone Microphone LDO LDO Audio IC (Charger + Bluetooth®) Audio IC(Charger + Bluetooth®) Battery Battery Battery Protection Circuit BatteryProtection Circuit Flash Memory FlashMemory Acceleration Sensor Acceleration Sensor Button Controller ButtonController Protection Protection Protection Protection TVS TVS Left Left Right Right Earphone Case EarphoneCase External connector for earphones case Power supply circuit for earphones case Battery management for earphones case Battery management for earphones Battery management for earphones Power supply circuit for earphones Power supply circuit for earphones Circuit protection for earphones Circuit protection for earphones
Power supply circuit for earphones case

Example of power supply circuit using MOSFET

Battery management for earphones case

Example of power supply monitoring circuit for battery charging and discharging system

External connector for earphones case

Protection circuit example of external connector part

Battery management for earphones

Example of power supply monitoring circuit for battery charging and discharging system

Power supply circuit for earphones

Example of power supply circuit using LDO Regulator

Circuit protection for earphones

Protection circuit example of internal IC

Sub block diagram

Power supply circuit for earphones case
Power supply lines (Load switch) for earphones case

Example of power supply circuit using MOSFET

Example of power supply circuit using MOSFET
Small signal MOSFET
Part Number
SSM6N951L
SSM6N56FE
SSM6N61NU
SSM3K56ACT
Toshiba Package Name TCSP6A-172101 SOT-563 (ES6) SOT-1118 (UDFN6) SOT-883 (CST3)
VDSS (Max) [V]   20 20 20
ID (Max) [A]   0.8 4.0 1.4
RDS(ON) (Max) [Ω] @ |VGS| = 2.5 [V]   0.3 0.045 0.3
Polarity N-ch×2 N-ch×2 N-ch×2 N-ch
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Battery management for earphones case
Battery management for earphones case

Example of power supply monitoring circuit for battery charging and discharging system

Example of power supply monitoring circuit for battery charging and discharging system
Small signal MOSFET
Part Number
SSM6N951L
SSM6N56FE
SSM6N61NU
SSM3K56ACT
Toshiba Package Name TCSP6A-172101 SOT-563 (ES6) SOT-1118 (UDFN6) SOT-883 (CST3)
VDSS (Max) [V]   20 20 20
ID (Max) [A]   0.8 4.0 1.4
RDS(ON) (Max) [Ω] @ |VGS| = 2.5 [V]   0.3 0.045 0.3
Polarity N-ch×2 N-ch×2 N-ch×2 N-ch
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External connector for earphones case
External connector for earphones case

Protection circuit example of external connector part

Protection circuit example of external connector part
TVS diode
Part Number
DF2B6USL
DF2B6M4BSL
DF2B7BSL
Toshiba Package Name SOD-962 (SL2) SOD-962 (SL2) SOD-962 (SL2)
VESD (Max) [kV] +/-10 +/-8 +/-30
IR (Max) [µA] 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.25 1.05 0.2
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 1.5 0.12 12
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Battery management for earphones
Battery management for earphones

Example of power supply monitoring circuit for battery charging and discharging system

Example of power supply monitoring circuit for battery charging and discharging system
Small signal MOSFET
Part Number
SSM6N951L
SSM6N56FE
SSM6N61NU
SSM3K56ACT
Toshiba Package Name TCSP6A-172101 SOT-563 (ES6) SOT-1118 (UDFN6) SOT-883 (CST3)
VDSS (Max) [V]   20 20 20
ID (Max) [A]   0.8 4.0 1.4
RDS(ON) (Max) [Ω] @ |VGS| = 2.5 [V]   0.3 0.045 0.3
Polarity N-ch×2 N-ch×2 N-ch×2 N-ch
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Power supply circuit for earphones
Power supply circuit for earphones

Example of power supply circuit using LDO Regulator

Example of power supply circuit using LDO Regulator
Small surface mounted LDO regulator
Part Number
TCR5BM Series
TCR5RG Series
TCR3UG Series
TCR2EN Series
Toshiba Package Name DFN5B WCSP4F WCSP4F SDFN4E
IOUT (Max) [mA] 500 500 300 200
VOUT [V] 0.8 to 3.6 0.9 to 5.0 0.8 to 5.0 1.0 to 3.6
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Circuit protection for earphones
Circuit protection for earphones

Protection circuit example of internal IC

Protection circuit example of internal IC
TVS diode
Part Number
DF2B6USL
DF2B6M4BSL
DF2B7BSL
Toshiba Package Name SOD-962 (SL2) SOD-962 (SL2) SOD-962 (SL2)
VESD (Max) [kV] +/-10 +/-8 +/-30
IR (Max) [µA] 0.1 0.1 0.1
Rdyn (Typ.) [Ω] 0.25 1.05 0.2
CT (Typ.) [pF] @ VR = 0 [V], f = 1 [MHz] 1.5 0.12 12
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Solution Proposal

These documents explain the key points of recommended semiconductor products and their features. Please use them for product selection.

Solution Proposal
SolutionProposal_Wireless Earbuds / English (PDF:655KB)
SolutionProposal_Wireless Earbuds / Japanese (PDF:1.0MB)

Reference Design

This is a picture of the DFN4D package.
TCR3EMxxA / 3DMxxA / 3LMxxA Series LDO Regulators With 300mA Output in Small DFN4D Package for Power Supply Circuit Applications
The lineup includes three series of small package LDO regulators that are ideal for mobile devices, etc. becuase of their features (standard type, low dropout voltage type, and low current consumption type). We provide the description of features, design points, and usage methods of each series.
LDO / DFN4D
Details
PCB photo example of Power multiplexer circuit
Power multiplexer circuit
In this reference design, a Power multiplexer circuit with 2 input and 1 output is implemented on a small PCB. MOSFET gate driver ICs, eFuse ICs, zener diodes and small package MOSFETs selected from Toshiba's diverse lineup are used create ideal diode like characteristics with BBM and MBB switching.
Power multiplexer circuit / 2 input and 1 output
Details
Photo of non-isolated buck DC-DC converter.
Non-Isolated Buck DC-DC Converter
This reference design provides design guide, data and other contents of multiple non-isolated buck DC-DC converter power supplies. Multiple variations of the power supply are optimized for various outputs, loads and board mounting areas.
Reference Design Center
Details
Power supply circuit example of LDO regulator TCR3UG series application for power supply of IoT devices.
LDO Regulator TCR3UG Series Application for Power Supply of IoT Devices
This reference design provides document with low consumption current, PSRR, and dynamic response.The LDO has small package, low consumed power, and fast load transient response.
LDO Regulator / TCR3UG
Details
Power supply circuit example of LDO regulator TCR15AG (fixed output voltage type) application & circuit.
LDO Regulator TCR15AG (fixed output voltage type) Application & Circuit
This reference design provides document with PSRR, dynamic response and controlling output voltage.The LDO has very small package and fixed output voltage for consumer application.
LDORegulator / TCR15AG
Details
Power supply circuit example of LDO regulator TCR15AGADJ application & circuit.
LDO Regulator TCR15AGADJ Application & Circuit
This reference design provides document with PSRR, dynamic response and controlling output voltage. The LDO has very small package and adjustable output for consumer application.
LDO Regulator / Design / Support / Reference Design Center
Details

Documents

Please see the following pages for other documents.

Video

Design & Development

Switched Mode Power Supply Library

you can select and download various basic topologies of a power supply unit based on your actual requirements in order to verify the behavior of MOSFETs with your simulation environment.

Switched Mode Power Supply Library
Motor Control and Driver Circuit Library

you can select and download various basic topologies of motor driver such as three-phase inverter circuit based on your actual requirements in order to verify the behavior of MOSFETs and another devices for your simulation environment.

Motor Control and Driver Circuit Library
Online Circuit Simulator

This service allows users to easily perform pre-verification of MOSFETs without the need to build a simulation environment.

Online Circuit Simulator
EDA/CAD Model Library

We provide simulation data, 3D models of packages, and land pattern models (2D models) used when developing product boards.

EDA/CAD Model Library
MCU Motor Studio

MCU Motor Studio features a PC Tool and motor control firmware dedicated to the TXZ+TM Family Advanced Class microcontrollers from Toshiba.

MCU Motor Studio
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Frequently Asked Questions

FAQs
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