LTC4123 – Low Power Wireless Charger for Hearing Aids


  • Complete Low Power Wireless NiMH Charger
  • Low Minimum Input Voltage: 2.2V
  • Small Total Solution Volume
  • 1.5V, 25mA Linear Single-Cell NiMH Charger
  • Temperature Compensated Charge Voltage
  • Integrated Rectifier with Overvoltage Limit
  • Zinc-Air Battery Detection
  • Reverse Polarity Protection
  • Thermally Enhanced 6-Lead (2mm × 2mm) DFN package

LTC4123 - Low Power Wireless Charger for Hearing Aids

Typical Application


The LTC®4123 is a low power wireless receiver and a constant-current/constant-voltage linear charger for NiMH batteries. An external programming resistor sets the charge current up to 25mA. The temperature compensated charge voltage feature protects the NiMH battery and prevents overcharging.

Wireless charging with the LTC4123 allows products to be charged while sealed within enclosures and eliminates bulky connectors in space constrained environments. The LTC4123 also makes it possible to charge NiMH batteries used in moving or rotating equipment.

The LTC4123 prevents charging of Zinc-Air batteries as well as batteries inserted with reverse polarity. The LTC4123 pauses charging if its temperature is too hot or too cold. An internal timer provides time-based charging termination.

The 2mm × 2mm DFN package and low external component count make the LTC4123 well-suited for hearing aid applications or other low power portable devices where small solution size is mandatory.


  • Hearing Aids
  • Smart Cards
  • Fitness Devices
  • Moving and/or Rotating Equipment

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For more detail:  LTC4123 – Low Power Wireless Charger for Hearing Aids

About The Author

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough research and presenting information in a structured and logical format.

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