Analog Devices LTC4125

Description

The LTC®4125 is a simple and high performance monolithicfull bridge resonant driver capable of delivering over 5W ofpower wirelessly to a properly tuned receiver. The devicecontrols the current flow in a series connected transmit coilLC network to create a simple, safe and versatile wirelesspower transmitter.The LTC4125 automatically adjusts its driving frequencyto match the LC network resonant frequency. ThisAuto Resonant switching allows the device to delivermaximum power from a low voltage input supply (3V to5.5V) to a tuned receiver. To optimize system efficiency,the LTC4125 employs a periodic transmit power searchand adjusts the transmission power based on the receiverload requirements. The device stops delivering powerduring a fault condition, or if a foreign object is detected.The LTC4125 also includes a programmable maximumaverage input current limit and an NTC input as additionalmeans for foreign object and overload protection. TheLTC4125 is available in a 20-lead low profile (0.75mm)4mm × 5mm QFN package.

Features

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

Typical applications

• Medical Equipment
• Military Sensors and Devices
• Industrial Handhelds
• Hermetically and/or Electrically Insulated Devices

More information

• Datasheet
• IC product information