Miniature wireless NiMH charger for hearing aids
Linear Technology has expanded its family of wireless battery charger ICs with the new LTC4123. This device combines a 30 mW wireless receiver with a linear constant current / constant voltage charger for NiMH batteries, such as the Varta Power One ACCU Plus series. Using an external LC resonant circuit, the LTC4123 can receive energy wirelessly from a magnetic field generated by a transmit coil. An integrated power management circuit converts the received AC voltage into DC.