LTC4126

RECOMMENDED FOR NEW DESIGNS

LTC4126

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

RECOMMENDED FOR NEW DESIGNS

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Part Models 2

1ku List Price Starting From $3.12

Features

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

Additional 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 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

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $3.12

Documentation

Technical Documents 4

LTC4126: 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter Data Sheet (Rev.A) 09/20/2018

R577 Reliability Data 03/23/2018

DC3080A-Kit - Demo Manual (Rev.0) 03/25/2021

Wireless Li-Ion Charger Solution for Wearable Devices Includes Integrated Step-Down DC-to-DC Converter 06/14/2019

Reference Materials 1

Enablement of Batteryless Applications with Wireless Power 02/01/2019

Design Resources 2

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)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC4126EV#TRPBF	12-Lead LQFN (2mm x 2mm x 0.74mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC4126EV#TRMPBF
Pin/Package Drawing
12-Lead LQFN (2mm x 2mm x 0.74mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC4126EV#TRPBF
Pin/Package Drawing
12-Lead LQFN (2mm x 2mm x 0.74mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Software & Part Ecosystem

Evaluation Kit

DC2663A-KIT

LTC4126EDC Low Power Wireless Charger Demonstration Kit

DC2663A-KIT Evaluation Board - Bottom View

LTC4126EDC Low Power Wireless Charger Demonstration Kit

Download

DC2663A-KIT

LTC4126EDC Low Power Wireless Charger Demonstration Kit

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Product Detail

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

ZIP

DC2663A-KIT - Design Files

14.22 M

ZIP

DC2663A-KIT - Schematic

239.19 K

PDF

DC2663A-KIT - Demo Manual

1.64 M

DC2663A-KIT

LTC4126EDC Low Power Wireless Charger Demonstration Kit

Tools & Simulations

LTspice 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.