The Power by Linear™ LTC4126 from Analog Devices expands their offerings in wireless battery charging, the LTC4126 combines a wireless powered battery charger for Li-Ion cells with a high efficiency multi-mode charge pump DC/DC converter, providing a regulated 1.2V output at up to 60mA.
Charging with the LTC4126 allows designers to specify a completely sealed end product without wires or connectors and eliminates the need to constantly replace non-rechargeable (primary) batteries. The efficient 1.2V charge pump output features pushbutton on/off control and can directly power the end product’s ASIC. This greatly simplifies the system solution and reduces the number of necessary external components.
The LTC4126, with its input power management circuitry, rectifies AC power from a wireless power receiver coil and generates a 2.7V to 5.5V input rail to power a full-featured constant-current/constant-voltage battery charger. Features of the battery charger include a pin selectable charge voltage of 4.2V or 4.35V, 7.5mA charge current, automatic recharge, battery temperature monitoring via an NTC pin, and an onboard 6-hour safety charge termination timer. Low battery protection disconnects the battery from all loads when the battery voltage is below 3.0V. The LTC4126’s charge pump switching frequency is set to 50kHz/75kHz to keep switching noise out of the audible range making it ideal for audio related applications such as hearing aids and wireless headsets.
The LTC4126 is housed in a highly compact, low profile (0.74mm) 12-lead 2mm × 2mm LQFN package. The device is guaranteed for operation from –20°C to 85°C in E-grade.
The device is ideal for space-constrained low power Li-Ion cell powered wearables such as hearing aids, medical smart patches, wireless headsets, and Internet of Things (IoT) devices.
DC2663A-KIT is a demonstration kit comprising of the DC2662A receiver board and the DC2661A single switch transmitter board. The DC2662A receiver board features the LTC4126 Wireless Li-Ion Charger with Regulator and the DC2661A transmitter board features the LTC6992 Voltage-Controlled Pulse Width Modulator (PWM) IC. The kit also comes with 2 x DC2687A boards which is an application-sized receiver board featuring the LTC4126 device. The application-sized receiver boards in the demo kit can charge a single Li-Ion battery at up to 7.5 mA with an air gap of 2.0 mm to 4.0 mm.
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