The LTC4123 is Linear Technology’s second wireless battery charger and receiver IC. There are no other ICs like this that combine a wireless receiver with a linear battery charger. By comparison, the LTC4120, also a wireless battery charger and receiver, has a switchmode synchronous buck architecture, with higher power capability of up to 2W which is approximately 400mA at 5V, and is meant for Li-ion batteries. Furthermore, the LTC4120 has no temperature compensation of charge voltage, and utilizes Dynamic Harmonization Control or DHC.