TIDA-050007

Ultra-low Standby Power Reference Design for Wireless Earbud Battery

TIDA-050007

Design files

Overview

New, completely wireless earbuds are charged by the battery inside their carrying case—a unique design that requires small solution sizes and efficient power components. Additionally, the large demands in this market are increasing the need to deliver equivalent functionality more economically. This ultra-low power reference design exhibits a charging case battery and boost converter powered from USB input.

Features
  • 18-µA ultra-low standby current
  • Supports up to 1.5 A fast charging current in the charging case
  • Supports pass-through mode when input higher than the output
  • Higher than 85% charging efficiency
  • Small solution size
  • Supports down to 1mA charging accuracy in the earbuds

A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDUEA6.PDF (1652 K)

Reference design overview and verified performance test data

TIDRWH1.PDF (196 K)

Detailed schematic diagram for design layout and components

TIDRWH2.PDF (100 K)

Complete listing of design components, reference designators, and manufacturers/part numbers

TIDRWH3.PDF (109 K)

Detailed overview of design layout for component placement

TIDRWH5.ZIP (1307 K)

Files used for 3D models or 2D drawings of IC components

TIDCEQ0.ZIP (755 K)

Design file that contains information on physical board layer of design PCB

TIDRWH4.PDF (434 K)

PCB layer plot file used for generating PCB design layout

Products

Includes TI products in the design and potential alternatives.

Battery charger ICs

BQ24073Standalone 1-cell 1.5-A linear battery charger, Power Path, 4.2-V VBAT and 4.4-V VOUT

Data sheet document-pdfAcrobat PDF open-in-new HTML
Battery charger ICs

BQ25100AStandalone 1-cell, 250-mA linear battery charger with 4.3-V charge voltage and prog. pre-charge

Data sheet document-pdfAcrobat PDF open-in-new HTML
Boost converters (integrated switch)

TPS610990.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TLV713P150-mA, capacitor-free low-dropout voltage regulator with active output discharge & enable

Data sheet document-pdfAcrobat PDF open-in-new HTML
Linear & low-dropout (LDO) regulators

TPS7A05200-mA, ultra-low-IQ, high-accuracy, low-dropout voltage regulator with enable

Data sheet document-pdfAcrobat PDF open-in-new HTML

Technical documentation

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Type Title Date
* Design guide Ultra-low Standby Power Reference Design for Wireless Earbuds Battery Charger Apr. 30, 2018

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