LTC4126

RECOMMENDED FOR NEW DESIGNS

7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter

Data Sheet (Rev. A) 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
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

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 multi-mode 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

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

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
LTC4126EV#TRMPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4126EV#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 1

LTC6990 - Counters, Timers and Delay Linear, LTC4126 - Battery Management

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

LTC4126EDC Low Power Wireless Charger Demonstration Kit

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Product Details

DC2663A-KIT is a Demonstration kit of the DC2662A receiver board, featuring the LTC4126EDC, the DC2661A singleswitch transmitter board featuring the LTC6992 and the DC2687A application-sized receiver board featuring the LTC4126EDC. The DC2662A can charge a single Li-Ion battery at up to 7.5 mA with an air gap of 2.0 mm to 4.0 mm.

Resources

DC2663A-KIT - Demo Manual
2/5/2019

DC2663A-KIT - Design Files
4/5/2019

DC2663A-KIT - Schematic
4/23/2019

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LTC4126

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Rarely Asked Question Page 1