Overview

Features and Benefits

  • Wireless Li-Ion Battery Charger Plus High Efficiency Multi-Mode Charge Pump DC/DC
  • Wideband Rx Frequency: DC to >10MHz
  • Integrated Rectifier with Overvoltage Limit
  • Pin Selectable Charge Voltage: 4.2V or 4.35V
  • Charge Current: 7.5mA (Fixed)
  • 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 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 LTC4126 charger is a full-featured constant-current constant-voltage Li-Ion battery charger with automatic recharge, automatic termination by safety timer, and battery temperature monitoring via an NTC pin. Charge current is fixed at 7.5mA with a 6-hour termination timer. Undervoltage protection disconnects the battery from all loads when the battery voltage is below 3.0V.

The tiny 2mm × 2mm LQFN package and minimal external component count make the LTC4126 well suited for Li-Ion battery powered hearing aid applications and other low power portable devices where a small solution size is required.

Applications

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

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Design Resources

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.

Discussions

LTC4126 Discussions

RE: LTC4124 reference design
13 week(s) ago in Power By Linear
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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.