Summary of LTC4123 – Low Power Wireless Charger for Hearing Aids
The LTC4123 is a low-power wireless NiMH charger featuring a 2.2V minimum input voltage and a 2mm × 2mm DFN package. It supports up to 25mA charging with temperature compensation, zinc-air detection, and reverse polarity protection. Ideal for hearing aids and rotating equipment, it enables sealed enclosure charging without bulky connectors.
Parts used in the Low Power Wireless NiMH Charger:
- LTC®4123
- External programming resistor
- NiMH batteries
- Zinc-Air battery
- 6-Lead (2mm × 2mm) DFN package
Features
- 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
Typical Application
Description
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.
Applications
- 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
- What is the primary function of the LTC4123?
It is a low power wireless receiver and a constant-current/constant-voltage linear charger for NiMH batteries. - How is the charge current determined?
An external programming resistor sets the charge current up to 25mA. - Can this device charge Zinc-Air batteries?
No, the LTC4123 prevents charging of Zinc-Air batteries. - Does the device handle reverse polarity?
Yes, the LTC4123 protects against batteries inserted with reverse polarity. - What happens if the device temperature is too high or low?
The LTC4123 pauses charging if its temperature is too hot or too cold. - Is there a method for time-based charging termination?
Yes, an internal timer provides time-based charging termination. - What is the minimum input voltage supported?
The device supports a low minimum input voltage of 2.2V. - Why is the DFN package suitable for hearing aids?
The 2mm × 2mm DFN package and low external component count make it well-suited for small solution sizes.
