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Ultra-low Standby Power Reference Design for Wireless Earbud Battery
TIDA-050007
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Key Document

Description

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

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Schematic/Block Diagram

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Design Files

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TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
BQ24073  Standalone 1-cell 1.5-A linear battery charger, Power Path, 4.2-V VBAT and 4.4-V VOUT  Battery management ICs  Sample & Buy View Design Kits & Evaluation Modules
BQ25100A  Standalone 1-cell, 250-mA linear battery charger with 4.3-V charge voltage and prog. pre-charge  Battery management ICs  Sample & Buy View Design Kits & Evaluation Modules
TLV713P  150-mA, capacitor-free low-dropout voltage regulator with active output discharge & enable  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS61099  0.7Vin Synchronous Boost Converter with 800 nA Ultra-Low Quiescent Current  Step-up (boost) regulators  Sample & Buy View Design Kits & Evaluation Modules
TPS7A05  200-mA, ultra-low-IQ, high-accuracy, low-dropout voltage regulator with enable  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
BQ24073 Download Download
BQ25100A Download -
TLV713P Download Download
Download Download
TPS61099 Download Download
Download -
TPS7A05 Download
Download Download
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Technical documentation

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User guide (1)
Title Type Size (KB) Date
PDF 1652 30 Apr 2018
Design files (6)
Title Type Size (KB) Date
ZIP 755 30 May 2018
ZIP 1307 30 May 2018
PDF 434 30 May 2018
PDF 109 30 May 2018
PDF 100 30 May 2018
PDF 196 30 May 2018

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