1. Products
  2. Power Management
  3. Battery Management
  4. Wireless Power Transfer
  5. LTC4126-ADJ


Features and Benefits

  • Wireless Li-Ion Battery Charger Plus High Efficiency Multi-Mode Charge Pump DC/DC
  • Programmable Charge Current from 1mA to 50mA Via an External Resistor
  • Wideband Rx Frequency: DC to >10MHz
  • Integrated Rectifier with Overvoltage Limit
  • Charge Voltage: 4.2V
  • Low Battery Disconnect: 3.0V
  • NTC Pin for Temperature Qualified Charging
  • DC/DC Regulated Output: 1.2V
  • DC/DC Output Current: Up to 60mA
  • 50kHz/75kHz Switching, No Audible Noise
  • Pushbutton and/or Digital on/off Control for DC/DC
  • Thermally Enhanced 12-Lead 2mm × 2mm LQFN Package

Product Details

The LTC4126-ADJ is a low-power wireless single-cell Li-Ion battery charger with an integrated step-down DC/DC regulator. The step-down regulator is a low-noise multimode charge pump which is powered from the battery and provides a regulated 1.2V at the output. The switching frequency is set to either 50kHz or 75kHz depending on the mode to keep any switching noise out of the audible range.

The constant-current constant-voltage Li-Ion battery charger has automatic recharge, automatic termination by safety timer, and battery temperature monitoring via an NTC pin. Charge current is programmable from 1mA to 50mA via an external resistor. Undervoltage protection disconnects the battery from all loads when the battery voltage is below 3.0V.

The small package and minimal external component count make the LTC4126-ADJ and its variants suitable for hearing aid applications and other low power portable devices. See the chart in the data sheet.


  • Hearing Aids
  • Low Power Li-Ion Powered Devices
  • Wireless Headsets
  • IoT Wearables

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (1)

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Design Resources

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Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC4126EV-ADJ#TRMPBF Material Declaration Reliability Data 12-Lead LQFN (2mm x 2mm x 0.74mm)
LTC4126EV-ADJ#TRPBF Material Declaration Reliability Data 12-Lead LQFN (2mm x 2mm x 0.74mm)
Wafer Fabrication Data

Sample & Buy

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Lead Times

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Evaluation Boards

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.