BQ50002 Datasheet, PDF (1/35 Pages) Texas Instruments – Low-Cost 5-V Wireless Power Transmitter Analog Front

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bq50002
SLUSBW1A – OCTOBER 2015 – REVISED OCTOBER 2015
bq50002 Low-Cost 5-V Wireless Power Transmitter Analog Front End
for WPC V 1.2 A11 Transmitters
1 Features
•1 5-V Transmitter AFE Compatible with Wireless
Power Consortium (WPC) V1.2 A11 Low Power
Transmitter Specification
• Designed to be used with bq500511 WPC
Controller
• Suitable for WPC and Proprietary 5-V Wireless
Power Transmitters
• Supports 5 W on the receiver output
• Integrates all the Analog Functions Required in a
Wireless Power Transmitter
– MOSFET Drivers and Synchronous N-Channel
Power FETs
– Accurate Current Sense
– Variable Frequency Oscillator
– High-Efficiency Voltage Regulator
– High-Sensitivity Demodulator to Decode
Signals from Receiver
• 2-Chip Solution Enables High-Efficiency
Transmitter Designs of >75% Efficiency
• Ultra-Low-Standby Power, Even During Digital
Ping (<30 mW)
• Dynamic Power Limiting (DPL)™ Enables
Operation from Input Sources with Limited Power
• System LED Indication of Charging State and
Fault Status
• Accurate Foreign Object Detection Method (FOD)
2 Applications
• WPC Compliant Wireless Transmitters for Smart
Phones and Wearable Applications
• Proprietary Wireless Chargers and Transmitters
• Medical and Wearable Applications
3 Description
The bq50002 is a highly integrated wireless power
transmitter analog front end that contains all of the
analog components required to implement a WPC
compliant 5-V transmitter. bq50002 integrates a full-
bridge power driver with MOSFETs, variable-
frequency oscillator, two-channel communication
demodulator, linear regulator, and protection circuits.
bq50002 must be used together with the digital
controller bq500511 to realize a compact two chip
wireless power transmitter solution. The bq500511
safely engages the RX device, receives packet
communication from the powered device and
manages the power transfer according to WPC v1.2
specification.
The system supports foreign object detection (FOD)
by continuously monitoring the amount of power
transferred and comparing that to the amount of
received power, as reported by the receiver. This
protects against power loss to metal objects
misplaced in the wireless power transfer field. In
order to do this, the bq50002 measures the input DC
current very accurately using a current sense
amplifier. Should any abnormal condition develop
during power transfer, the bq500511 handles it and
provides indication outputs. Comprehensive status
and fault monitoring features enable a low cost yet
robust WPC-certified wireless power system design.
The bq50002 is available in a thermally enhanced
5.00 mm × 5.00 mm, 32-pin QFN package.
Device Information ⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq50002
QFN (32)
5.00 mm × 5.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
5V
Input
Simplified Schematic
TRANSMITTER
bq50002
Power
RECEIVER
Rectification
Voltage
Conditioning
3V
PWM
Control
Feedback
bq500511
Communication
bq51k
Controller
Load
1
Efficiency vs. Power
80%
75%
70%
65%
60%
55%
50%
45%
40%
35%
30%
25%
20%
15%
10%
5%
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Power (W)
D001
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.