LTC4126-10

RECOMMENDED FOR NEW DESIGNS

10mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • 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: 4.1V or 4.2V
  • Charge Current: 10mA (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

The LTC4126-10 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 LTC4126-10 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 10mA with a 3-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 LTC4126-10 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
LTC4126-10
10mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter
LTC4126-10 Application Circuit LTC4126-10 Pin Configuration LTC4126-10 Image
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Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
LTC4126
RECOMMENDED FOR NEW DESIGNS 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC4126-ADJ
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