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STWLC04：Qi based, 1 W optimized wireless power receiver

The STWLC04 is an integrated wireless power receiver suitable for wearable applications. The STWLC04 is focused on 1-watt power transfer based on Qi protocol with digital control and precise analog control loops ensuring stable operation. Together with the STWBC-WA transmitter, the STWLC04 enables a complete wireless power transmission. I²C interface allows many parameters to be customized in the device and this configuration can be stored in the embedded NVM.

The STWLC04 can deliver the output power in two modes: as a power supply with configured output voltage or as a simple CC/CV battery charger with configurable charging current, charging voltage and termination current. The STWLC04 can detect the external (wired) power supply connection and drive an external power switch.

Key Features

• 1 W output power
• Qi 1.0 wireless communication protocol based
• Integrated high efficiency synchronous rectifier
• 800 kHz programmable step-down converter with input current and input voltage regulation loop
• Step-down converter efficiency up to 90%
• Simplified Li-Ion/Polymer charger function
• 32-bit, 16 MHz embedded microcontroller with 16 kB ROM and 2 kB RAM memory
• 2 kB NVM for customization
• Integrated driver for external supply switch
• Precise voltage and current measurements for received power calculation
• I2 C interface
• Configurable GPIO output
• Rx coil NTC protection
• Thermal protection
• Low power dissipative rectifier overvoltage clamp
• Flip Chip 77 bumps (3.12x4.73 mm)

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