BQ51221 Datasheet, PDF (1/49 Pages) Texas Instruments – Single Chip Wireless Power Receiver

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bq51221
SLUSBS9A – FEBRUARY 2014 – REVISED JULY 2014
bq51221 Dual Mode 5-W (WPC and PMA) Single Chip Wireless Power Receiver
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
• 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (MAX)
bq51221
YFP (42)
3.586 mm × 2.874 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
4 Simplified Schematic
bq51221
AD-EN
AD
CCOMM1
COMM1
CBOOT1
BOOT1
C1
AC1
OUT
C4
RECT
C3
C2
AC2
CBOOT2
CCOMM2
CCLAMP2
CCLAMP1
BOOT2
COMM2
CLAMP2
CLAMP1
TERM
CM_ILIM
ILIM FOD
VO_REG
VIREG
TS/CTRL
TMEM
C5
LPRB1
LPRB2
SCL
SDA
PGND
R7
R6
z
z _NTC
R5
R1
RFOD
System
Load
RECT
R9
R8
HOST
bq51221 Dual Mode Efficiency 5-V Out
90
80
70
60
50
40
30
20
10
0
0
PMA Duracell TX
WPC A1 TX
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2
I_OUT (A)
D001
1
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.