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1 Features

1? Robust 5-W Solution With 50% Lower Losses for

Improved Thermals

– Inductorless Receiver for Lowest Height Profile

Solution

– Adjustable Output Voltage (4.5 to 8 V) for Coil

and Thermal Optimization

– Fully Synchronous Rectifier With 96%

Efficiency

– 97% Efficient Post Regulator

– 79% System Efficiency at 5 W primary?

WPC v1.1 and PMA Compliant Communication

? Patented Transmitter Pad Detect Function

Improves User Experience

? I2C Communication with Host

2 Applications

? Smart Phones, Tablets, and Headsets

? Wi-Fi Hotspots

? Power Banks

? Other Handheld Devices

3 Description

The bq51221 device is a fully contained wireless

power receiver capable of operating in both the WPC

and PMA protocols which allows a wireless power

system to work with both WPC and PMA inductive

charging standards. The bq51221 device provides a

single device power conversion (rectification and

regulation) as well as the digital control and

communication for both standards. It also has

autonomous detection of protocol and requires no additional active devices. The bq51221 device

complies with the WPC v1.1 and PMA communication

protocol. Together with the WPC or a PMA primary?

side controller, the bq51221 device enables a complete wireless power transfer system for a

wireless power supply solution. The receiver allows

for synchronous rectification, regulation and control

and communication to all exist in a market-leading

form factor, efficiency, and solution size.