LTC4124 100mA Wireless Li-Ion Charger with Low Battery Disconnect FEATURESDESCRIPTION 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: DC to >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 Tiny Total Solution Size with Few Externals The LTC4124 includes an NTC input for safe temperature n Small Thermally Enhanced 12-lead qualified charging and a battery disconnect feature that 2mm × 2mm LQFN Package prevents damage to a battery due to over-discharging. The 2mm × 2mm LQFN package and minimal number of APPLICATIONS external components make the LTC4124 well-suited for n Medical Wireless Sensors low power portable applications where small solution size n Military Wearables is mandatory. n High End Wireless Headsets All registered trademarks and trademarks are the property of their respective owners. n Streaming Headsets with Bluetooth Connectivity n Virtual Reality Headsets n High End Remote Control n IoT Devices TYPICAL APPLICATION10mA Wireless 4.2V Li-Ion Charger with 1mA Pre-ChargeTop and Bottom View of the IC withConditioning and 2.7V Low Battery DisconnectComplete Application Circuit Boards IIN ACIN DCIN PRECHG AIR GAP VSEL2 LTC4124 VSEL1 IOUT LBSEL VCC OUT ISEL1 (OPTIONAL) TX ISEL2 CHRG TO BAT CIRCUIT GND BAT NTC 4124 TA01a + 100k 4.2V Rev. 0 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Functional Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts