ADI’s LTC4126 is a full-featured 7.5 mA wireless lithium-ion (Li-Ion) battery charger with a 1.2 V inductorless dc-to-dc converter designed for hearing aids, wireless headsets, and other space-constrained wearable products that require wireless charging. The LTC4126 can be combined with an LTC6990-based ZVS single transistor transmitter for a complete wireless charging solution.
Efficient Wireless Input Power Controller
Wearable devices are increasingly trending toward wireless battery charging, which improves the user experience by eliminating the need for cables or exposed connectors on the wearable.
The LTC4126 charger, dc-to-dc converter features a wireless power controller that enables it to receiver power wirelessly from an alternating magnetic field generated by a transmit coil (such as in an LTC6990 solution). The wireless power controller rectifies the ac voltage from the receiver side resonant tank into a dc voltage at VCC pin. This dc voltage is fed to a linear charger, which regulates charge to the battery.
For details, click https://www.analog.com/en/design-notes/wireless-li-ion-charger-solution-for-wearable-devices.html.
