BQ500412 Datasheet, PDF (1/28 Pages) Texas Instruments – Low System Cost, Wireless Power Controller for WPC TX A6

bq500412
www.ti.com
SLUSBO2A – NOVEMBER 2013 – REVISED DECEMBER 2013
Low System Cost, Wireless Power Controller for WPC TX A6
Check for Samples: bq500412
FEATURES
1
•2 Proven, Qi-Certified WPC1.1 Solution for
Transmit-Side Application (suitable for 1, 2 or
3 coil configurations)
• Lowest Device Count for Full WPC1.1 12-V A6
Solution (single driver stage for all coils)
• New Standby Scheme Reduces Standby and
Sleep Power Without Need for Extra
Supervisor Circuit
• Improved FOD Calibration Scheme Simplifies
Certification and Increases Accuracy at Higher
Power (customer configurable)
• Dynamic Power Limiting™ for USB and
Limited Power Source Operation When Used
With 5-V Input
• Digital Demodulation Removes Need for
External Filter Circuitry
• 10 Configurable LED modes Indicate Charging
State and Fault Status
APPLICATIONS
• Wireless Power Consortium (WPC1.1)
Compliant Wireless Chargers For:
– Qi-Certified Smart Phones and Other
Handhelds
– Car and Other Vehicle Accessories
• See www.ti.com/wirelesspower for More
Information on TI's Wireless Charging
Solutions
DESCRIPTION
The bq500412 is a Qi-certified value solution that
integrates all functions required to control wireless
power delivery to a single WPC1.1 compliant
receiver. It is WPC1.1 compliant and designed for 12-
V systems, or 5-V systems with an optional boost
converter, as a wireless power consortium type A6
free positioning transmitter. The bq500412 pings the
surrounding environment for WPC compliant devices
to be powered, safely engages the device, receives
packet communication from the powered device and
manages the power transfer according to WPC1.1
specification. To maximize flexibility in wireless power
control applications, Dynamic Power Limiting™ (DPL)
is featured on the bq500412 when used with an
optional boost converter from a 5-V input. Dynamic
Power Limiting™ enhances user experience by
seamlessly optimizing the usage of power available
from limited input supplies. The bq500412 supports
both Foreign Object Detection (FOD) and enhanced
Parasitic Metal Object Detection (PMOD) for legacy
product by continuously monitoring the efficiency of
the established power transfer, protecting from power
lost due to metal objects misplaced in the wireless
power transfer field. Should an abnormal operating
condition develop during power transfer, the
bq500412 handles it and provides indicator outputs.
Comprehensive status and fault monitoring features
enable a low cost yet robust, Qi-certified wireless
power system design.
The bq500412 is available in a 48-pin, 7-mm x 7-mm
QFN package.
System Diagram and Efficiency Versus System Output Power
12 V Input
80
70
3.3 VDC
Current
Regulator
Sense
WPC A 6 Coil
60
Assembly
50
40
Half-
Bridge
Stage
30
BQ500412
20
COMM
Signal
10
Coil Select
0
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5
Power (W)
C001
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Dynamic Power Limiting is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2013, Texas Instruments Incorporated