LTC4125 5W AutoResonant Wireless Power Transmitter Fea T Descrip T n Monolithic 5W Wireless Power Transmitter The LTC 4125 is a simple and high performance monolithic TM n AutoResonant Switching Frequency Adjusts to Res- full bridge resonant driver capable of delivering over 5W of onant Capacitance and Transmit Coil Inductance* power wirelessly to a properly tuned receiver. The device n Transmit Power Automatically Adjusts to Receiver controls the current flow in a series connected transmit coil Load* LC network to create a simple, safe and versatile wireless n Input Voltage Range: 3V to 5.5V power transmitter. n Integrated 100m Full Bridge Switches The LTC4125 automatically adjusts its driving frequency n Multiple Foreign Object Detection Methods to match the LC network resonant frequency. This n Programmable Average Input Current Limit and AutoResonant switching allows the device to deliver Monitor maximum power from a low voltage input supply (3V to n NTC Input for System/Component Temperature 5.5V) to a tuned receiver. To optimize system efficiency, Qualified Power Transfer the LTC4125 employs a periodic transmit power search n Wide Operating Switching Frequency Range: and adjusts the transmission power based on the receiver 50kHz to 250kHz load requirements. The device stops delivering power n Thermally Enhanced 4mm 5mm QFN 20-Lead Package during a fault condition, or if a foreign object is detected. The LTC4125 also includes a programmable maximum a T average input current limit and an NTC input as additional means for foreign object and overload protection. The n Hermetically and/or Electrically Insulated Devices LTC4125 is available in a 20-lead low profile (0.75mm) n Military Sensors and Devices 4mm 5mm QFN package. n Medical Equipment L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Industrial Handhelds AutoResonant is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 9041254. *The AutoResonant and Auto Load Detect features use patent pending circuits and algorithms. Typical a T 5W Wireless Transmitter V IN 20m 3V TO 5.5V L L TX RX COIL COIL 2.21k 1F 100F 10k IN IN1 IN2 TRANSMITTER RECEIVER CIRCUIT CIRCUIT STAT NTC + R V L IN IS SW1 10nF L TX 11.3k 10k AIR GAP 24H + IS C TX 100nF V IN EN LTC4125 SW2 100k V FTH IN 59.0k 100k PTHM C FB1 FB 0.1F IMON CTD CTS GND 5.23k 10nF 348k 470pF 4.7nF 4125 TA01 4125f 1 For more information www.linear.com/LTC4125 ion pplica ions pplica ion uresLTC4125 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW IN, IS , CTD ............................................. 0.3V to 6V + IN1, IN2, IS ................................. 0.3V to V + 0.3V IN DTH, FTH, PTHM, FB ................... 0.3V to V + 0.3V IN 20 19 18 17 NTC, EN, PTH1, PTH2, CTS.......... 0.3V to V + 0.3V IN IN 1 16 GND IMON ................ 0.3V to MIN(V , V +, V ) + 0.3V IN IS IS CTS 2 15 EN STAT ........................................... 0.3V to V + 0.3V IN IS 3 14 CTD 21 + GND STAT ......................................................1mA to 2mA IS 4 13 FB IMON 5 12 PTHM Operating Junction Temperature Range NTC 6 11 PTH1 (Note 2) ............................................. 40C to 125C 7 8 9 10 Storage Temperature Range .................. 65C to 150C UFD20 PACKAGE 20-LEAD (4mm 5mm) PLASTIC QFN T =125C, =43C/W JMAX JA EXPOSED PAD (PIN 21) MUST BE CONNECTED TO GND o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC4125EUFD PBF LTC4125EUFD TRPBF 4125 20-Lead (4mm 5mm) Plastic QFN 40C to 125C LTC4125IUFD PBF LTC4125IUFD TRPBF 4125 20-Lead (4mm 5mm) Plastic QFN 40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: