Complete Wireless Charging
le &
p
m
i
S pact
Com
3V –5VIN
Foreign Object
Detection
LTC4125
LTC4120
Transmitter
Receiver
Reliable Charging Tolerant of Coil Coupling Misalignment
The LTC®4125 wireless power transmitter brings a new level of performance and simplicity to the transfer of up to 5W of power
wirelessly to an electrically isolated receiver capable of that power level. It is a monolithic driver that controls the current flow
in a series-connected transmit coil LC network. The LTC4125 features auto-resonant switching, allowing it to automatically
adjust its driving frequency to match the LC network resonant frequency. It also implements foreign object detection, and
auto-resonant switching improves performance with mismatched resonant components and poorly coupled coils. The LTC4125
completes a simple wireless power solution when combined with one of Linear’s wireless power receiver ICs.
Power Transfer vs. Alignment
Features
• Uses Standard Coils
• Auto-Resonant Switching Frequency
Adjusts to Resonant Capacitor &
Transmit Coil Inductance
• Transmit Power Automatically
Adjusts to Receiver Load
• Integrated 100mΩ Full Bridge
Switches
• Foreign Object Detection
• 4mm x 5mm QFN-20 Package
(For LTC4125/4120 System)
20.0
Z Transmit Distance (mm)
www.linear.com/product/LTC4125
Full power (1.68W)
1-800-4-LINEAR
1/2 power (0.84W)
15.0
Info & Free Samples
10.0
5.0
0.0
0
5
10
15
X,Y OFFSET (mm)
20
, LT, LTC, LTM, Linear Technology and the Linear logo are
registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.