LTC4123

RECOMMENDED FOR NEW DESIGNS

Low Power Wireless Charger for Hearing Aids

Part Models: 2
1ku List Price: Starting From $3.18

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Overview

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

The LTC4123 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

Part Models: 2
1ku List Price: Starting From $3.18

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC4123EDC#TRMPBF	6-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4123EDC#TRPBF	6-Lead DFN (2mm x 2mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Oscillators 1
LTC6990	PRODUCTION	TimerBlox: Voltage Controlled Silicon Oscillator

Parts	Product Life Cycle	Description
LTC4120 LTC4120-4.2		Wireless Power Receiver and 400mA Buck Battery Charger

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4123

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC4123EDC Demo Board | A Kit to Charge a NiMH Button Cell Battery Up to 25mA at 1.5V from a 5V Wireless Transmitter

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Product Details

Demonstration Circuit DC2302A is a kit of the DC2300A demonstration board, featuring the LTC4123EDC, and the DC2301A Single Switch Transmitter demonstration board. The DC2300A can charge a single NiMH battery at up to 25mA, with an air gap of 0.8mm to 4.0mm. The DC2300A detects Zn-Air primary cells and will not charge them.