LTC4124 100mA Wireless Li-Ion Charger with Low Battery Disconnect FEATURES DESCRIPTION n Complete Wireless Power Receiver, Li-Ion Charger The LTC 4124 is a simple high performance wireless and PowerPath Controller Li-Ion charger with low battery disconnect. The pin- n Wireless Input Power Control and Rectification selectable charge current (up to 100mA) and charge n Wideband Wireless Power Frequency: DCto>10MHz voltage ensure versatility while minimizing the number n Pin-Selectable Charge Current: of required external components. 10mA/25mA/50mA/ 100mA Wireless charging with the LTC4124 allows devices to be n Pin-Selectable Charge Voltage: 4.0V/4.1V/4.2V/4.35V charged while sealed within enclosures and eliminates n Pin-Selectable Low Battery Disconnect: 2.7V/3.2V bulky connectors in space-constrained applications. n Zero Battery Drain Current in Disconnect/Ship Mode Elimination of exposed conductive connectors also cre- n Pin-Selectable Low Battery Pre-Charge Current Enable ates more robust devices while ensuring an effortless n NTC Input for Temperature Qualified Charging end-user experience. n Safety Charge Termination Timer n The LTC4124 includes an NTC input for safe temperature Tiny Total Solution Size with Few Externals n qualified charging and a battery disconnect feature that Small Thermally Enhanced 12-lead prevents damage to a battery due to over-discharging. 2mm2mmLQFN Package The 2mm 2mm LQFN package and minimal number of APPLICATIONS external components make the LTC4124 well-suited for n low power portable applications where small solution size Medical Wireless Sensors n is mandatory. Military Wearables n All registered trademarks and trademarks are the property of their respective owners. High End Wireless Headsets n Streaming Headsets with Bluetooth Connectivity n Virtual Reality Headsets n High End Remote Control n IoT Devices TYPICAL APPLICATION 10mA Wireless 4.2V Li-Ion Charger with 1mA Pre-Charge Top and Bottom View of the IC with Conditioning and 2.7V Low Battery Disconnect Complete Application Circuit Boards I IN ACIN DCIN PRECHG AIR GAP I OUT VSEL2 LTC4124 VSEL1 LBSEL V OUT CC ISEL1 (OPTIONAL) ISEL2 CHRG T X TO BAT CIRCUIT GND BAT NTC 4124 TA01a 100k 4.2V Rev. A 1 Document Feedback For more information www.analog.com +LTC4124 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Input Supply Voltages DCIN, V , BAT ........................................ 0.3V to 6V CC ACIN ..................................... V 40V to V + 0.3V CC CC 12 11 V 1 10 BAT CC Input Supply Currents CHRG 2 9 NTC I(ACIN) ............................................................ 200mA 13 GND I(DCIN) ............................................................ 200mA PRECHG 3 8 LBSEL CHRG ...............................................0.3V to V + 0.3V CC VSEL1 7 4 ISEL2 5 6 Programming Pins VSEL1, VSEL2, ISEL1, ISEL2 ........0.3V to V + 0.3V CC NTC, LBSEL, PRECHG .................0.3V to V + 0.3V CC LQFN PACKAGE 12-LEAD (2mm 2mm 0.74mm) Operating Junction Temperature Range T = 85C, = 92C/W JMAX JA (Note 3) ................................................... 20C to 85C EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 40C to 125C Maximum Reflow (Package Body) Temperature ..........................................................260C ORDER INFORMATION PACKAGE** MSL PART NUMBER PART MARKING* FINISH CODE PAD FINISH TYPE RATING TEMPERATURE RANGE LQFN (Laminate Package LTC4124EV TRPBF LHFW e4 Au (RoHS) 3 20C to 85C with QFN Footprint) LQFN (Laminate Package LTC4124EV TRMPBF LHFW e4 Au (RoHS) 3 20C to 85C with QFN Footprint) Contact the factory for parts specified with wider operating temperature Recommended LGA and BGA PCB Assembly and Manufacturing ranges. *Device temperature grade is identified by a label on the shipping Procedures container. LGA and BGA Package and Tray Drawings Pad finish code is per IPC/JEDEC J-STD-609. Parts ending with PBF are RoHS and WEEE compliant. **The LTC4124 package has the same dimensions as a standard 2mm 2mm 0.74mm QFN Package. Rev. A 2 For more information www.analog.com VSEL2 DCIN ISEL1 ACIN