LTC4126-ADJ

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.12

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Overview

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

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.

APPLICATIONS

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

Part Models: 2
1ku List Price: Starting From $3.12

Documentation

Data Sheet 1

LTC4126-ADJ: Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter Data Sheet (Rev.0) 09/28/2020

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
LTC4126EV-ADJ#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4126EV-ADJ#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	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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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4126-ADJ

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

LTC4126-ADJ 10mA Wireless Charger Demonstration Kit

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Features and Benefits

Demonstration Kit DC3080-KIT features LTC4126-ADJ, wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter. This kit comprises a wireless transmitter DC3081A, a wireless receiver DC3078A and two 6mm application-sized receivers DC3079A.

DC3078A wireless charger receiver incorporates an external trickle charge circuit that reduces the charge current to 1mA when a deeply discharged battery with voltage lower than 2.8V is plugged in. The combination of DC3081A transmitter and DC3078A receiver can charge a single Li-Ion battery at up to10mA with an airgap of 4.0mm to 8.0mm.