LTC4125

RECOMMENDED FOR NEW DESIGNS

5W AutoResonant Wireless Power Transmitter

Data Sheet Product Selection Table

Part Models: 4
1ku List Price: Starting From $4.78

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Part Details

Monolithic 5W Wireless Power Transmitter
AutoResonant^™ Switching Frequency Adjusts to Resonant Capacitance and Transmit Coil Inductance*
Transmit Power Automatically Adjusts to Receiver Load*
Input Voltage Range: 3V to 5.5V
Integrated 100mΩ Full Bridge Switches
Multiple Foreign Object Detection Methods
Programmable Average Input Current Limit and Monitor
NTC Input for System/Component Temperature Qualified Power Transfer
Wide Operating Switching Frequency Range: 50kHz to 250kHz
Thermally Enhanced 4mm × 5mm QFN 20-Lead Package

Part Models: 4
1ku List Price: Starting From $4.78

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
LTC4125EUFD#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4125EUFD#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4125IUFD#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4125IUFD#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report Qualification Results Summary
LTC4125EUFD#PBF	PRODUCTION
LTC4125EUFD#TRPBF	PRODUCTION
LTC4125IUFD#PBF	PRODUCTION
LTC4125IUFD#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Wireless Power Transfer 1
LTC4120 LTC4120-4.2		Wireless Power Receiver and 400mA Buck Battery Charger

Evaluation Kits

650mA Wireless Battery Charger Demonstration Kit

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Product Details

DC2554A-KIT is a kit of the DC2556A transmitter, featuring LTC4125, the DC2555A-A/DC2555A-B receiver, featuring LT3652HV. The DC2555A-A/DC2555A-B receiver can charge a single Li-Ion battery at up to 650mA with an air gap of 3.0mm to 12.0mm between the transmit and receive coils. The DC2556A transmitter supports Optimum Power Search and Foreign Object Detection features via LTC4125.

Resources

DC2554A-A-KIT/DC2554A-B-KIT - Demo Manual
12/6/2019

DC2554A-A - Schematics
12/6/2019

DC2554A-B Schematics
12/6/2019

DC2554A-A - Design Files
12/6/2019

DC2554A-B - Design Files
12/6/2019

LTC4124/LTC4125, 50mA Wireless Li-Ion Charger Demonstration Kit

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Product Details

DC2770A-A-KIT is a kit of the DC2773A-A transmitter board (featuring LTC4125) and the DC2775A-C (featuring LTC4124). The DC2775A-C receiver board can charge a single Li-Ion battery at up to 50 mA with an air gap of 3.0 mm to 5.0 mm between the transmit and receive coils. The DC2773A-A transmitter board supports Foreign Object Detection via the LTC4125.

Resources

DC2770A-A Design Files
11/25/2019

DC2770A-A - Schematics
11/25/2019

DC2770A-A Demo Manual
11/25/2019

LTC4124/LTC4125, 100mA Wireless Li-Ion Charger Demonstration Kit

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Product Details

DC2770A-B-KIT is a kit of the DC2773A-B transmitter board (featuring LTC4125) and the DC2775A-D (featuring LTC4124). The DC2775A-D receiver board can charge a single Li-Ion battery at up to 100 mA with an air gap of 3.0 mm to 5.0 mm between the transmit and receive coils. The DC2773A-B transmitter supports Optimum Power Search and Foreign Object Detection features via LTC4125.

Resources

DC2770A-B Schematics
11/25/2019

DC2770A-B Design Files
11/25/2019

DC2770A-B Demo Manual
11/25/2019

Wireless Power Transfer Demonstration Kit featuring the LTC4125EUFD and the LTC4120EUD

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Product Details

Demonstration kit DC2386A is a kit of the DC2330A LTC4125EUFD demonstration board, the DC2445A-A/DC2445A-B LTC4120EUD demonstration board, and an assortment of different length standoffs. The DC2330A can deliver up to 1.68W to the receive board with up to 12mm spacing between the transmit and receive coils.