Proxi-Point™ for LTC4120

*For Engineering Evaluation Purposes only, until further notice*

The Proxi-Point™ is a fully assembled, tested and certified transmitter unit capable of supplying power to 1 receiver module and offers features such as foreign object detection and a stable crystal controlled operating frequency. The Proxi-Point is available as a ready to use transmitter unit or can be integrated into a product and has a total output power capacity of up to 2W.

Usage with LTC4120 receiver

Linear tech1The Proxi-Point™ is designed to be integrated with an LTC4120 wireless power receiver to form a fully functional resonant wireless charging system. Receiver coils must be tuned to the operating frequency of the transmitter in order to receive power. The power output of the Proxi-Point™ depends on the load of the receiver. The wireless power charging system provides an efficient method for wireless battery charging as the power output by the transmitter varies automatically based on the power used to charge a battery connected to a receiver.


  • Smart device detection maximises power transfer to receiver at maximum efficiency – automatic identification of the device receiver so that power is no longer supplied when the receiver is removed.
  • Over voltage and over temperature protection for safe and reliable operation
  • No interference with operation of devices
  • Intelligent foreign metal object detection provides protection from power transfer to metal objects, overheating and power loss.
  • Low operating temperature for modules
  • Completely safe to use
  • EMC/EMI compliant
  • Low power standby
  • Fixed Operating Frequency


Electrical Specifications

Total Output Power 2W
Input Voltage 24V
Input Current Up to 250mA
Standby Power <100 mW
Frequency of Operation 130 kHz
Tx to Rx ratio (1:N) 1:1

Environmental Specifications

Ingress Protection Level IP32
Over Temperature Protection (OTP) OTP triggers and shuts down Tx when ambient temp is 45±3°C.  System starts up after ambient temp drops to 35±3°C
Humidity 5 to 95 RH
Emissions (EMC Testing) Compliant to CSPR11 and MPE20
Operating ambient temperature range -10°C to +40°C, 14°F to 104°F

Mechanical Specifications

Dimensions L = 66mm, W = 70mm, H = 11mm
Weight 48 grams
Active Charging Area Rx output power will be delivered while the center of the Rx coil is inside a 20mm diameter circle (at 3mm coil-to-coil distance) from center of Tx
Z-axis distance (coil to coil) Rx Output power will be delivered when Rx coil to Tx coil distance is between 2.5 – 7.0mm and the angle between the coil plates is ±150°
Status Indicator LED Green: Standby, Red: Charging, Flashing Red: Foreign Object Detection.
Coupling Type Point to Point