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PDF TS51111 Data sheet ( Hoja de datos )
| Número de pieza | TS51111 | |
| Descripción | High Efficiency Synchronous Rectifier and Charging IC | |
| Fabricantes | Semtech | |
| Logotipo |  |
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TS51111
High Efficiency Synchronous Rectifier and
Charging IC for Wireless Power Applications
TRIUNE PRODUCTS
Features
• High efficiency synchronous rectification of AC input
• Supports both Direct and Indirect Charging applications
• Supports WPC Qi® compliant and non-compliant systems
• Low Rds-on rectifier switches
• High voltage input for higher power systems
• Up to 20W+ Output
• >98% efficiency at high currents
• Integrated switches for load modulation
• Integrated switch for battery disconnect
• Integrated precharge current source
• 50mA output low Iq LDO
• Analog mux for ADC sensing
• Supply Under Voltage Lockout
• Low external component count
• Ultra-low standby quiescent current
• Junction operating temperature -40C to 125C
Applications
• Cell Phones and Smart Phones
• Tablet Computers
• eReaders
• Laptop Computers
• Small Digital Cameras
• Portable Video Recorders
• Wireless charging for portable devices
Description
The TS51111 is a fully-integrated synchronous rectifier for wireless
charging applications with additional integrated components to
minimize system BOM.
The TS51111 includes a high efficiency synchronous rectifier to
convert the input AC power signal to a DC output level for battery
charging. The device supports both direct battery charging and
indirect power applications. Low Rds-on switches minimize power
dissipation. High voltage input capability allows for simple and
robust secondary side charger implementation. An integrated switch
provides the battery charging path and combined with the rectifier
provides back feed protection to the AC inputs. A precharge current
source is also included for low battery voltage precharge operation.
Communication capability is achieved using integrated high voltage
switches.
The TS51111 includes several additional modules to allow simple
integration into wireless power systems. Integrated resistor dividers
with zero-current off-mode allow external ADC measurement of
PDC, PACKP, USB and thermistor voltages. High voltage switches are
included for communication modulation.
Power to an external controller is provided through an integrated
LDO. The ultra-low quiescent current regulator can supply high
output currents at low dropout with minimal current draw from the
battery.
Available in a 45 pin WCSP and 36 pin 6x6 QFN package.
TS51111
Final Datasheet
April 17, 2015
Rev 2.2
www.semtech.com
1 of 22
Semtech
Proprietary & Confidential
1 page  
Pin Description (QFN)
Pin #
1
2
3
4
5
6
7, 13-14
8, 11-12
9-10, 17-18
15-16, 20
19
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Pin Name
EN_MOD
TXD
RXD
PACKS
PACKP_K
PACKP
PDC
VAC1
PGND
VAC2
VAC_DET
OVP
BST2
BST1
VCORE
THERM
SDA
SCL
NC
VREF
AMUX
UART
PACKN
AGND
MOD1
MOD2
USB
Pin Function
Enable Modulation
UART TX
UART RX
Output Current Sense
PACKP Kelvin
Battery Connection
Rectified voltage
Coil input
Power gnd
Coil input
VAC Detect
OV Clamp
BST cap
BST cap
VCORE LDO
Thermistor Drive
I2C Data
I2C Clock
No Connect
Vref Output
Analog Sense
UART Bus
PACKN Sense
Analog Ground
MOD cap connection
MOD cap connection
USB Supply
Description
Enables modulation switches
UART Tx
UART Rx
Sense node for output current
PACKP Kelvin
Battery positive terminal
Filter capacitor connection for rectified voltage
AC power input from coil
GND for synchronous rectifier and charging path
AC power input from coil
Indicates incoming power to external micro
Overvoltage pulldown clamp
Boost capacitor connection for HS FETs
Boost capacitor connection for HS FETs
LDO output
Thermistor drive
I2C data
I2C clock
No Connect
ADC reference output
Analog MUX output
UART bus
Battery negative terminal
Quiet ground connection
Pulldown for capacitive modulation
Pulldown for capacitive modulation
USB supply and detection input
TS51111
Final Datasheet
April 17, 2015
Rev 2.2
www.semtech.com
5 of 22
Semtech
Proprietary & Confidential
5 Page 
Functional Description (continued)
The load switch can be reconfigured to operate as a linear
regulator (see Charge Termination section below). When
enabled, the output will soft-start to limit inrush current.
In linear regulation mode, the PDC voltage must be
regulated close to the dropout voltage to limit power
dissipation in the IC.
In linear regulation mode, a configurable, integrated current
limit circuit provides fault protection to the system. At the
maximum setting, current limit is disabled. If the output
current hits the current limit threshold, the device will
automatically limit the output current and set the FAULT
register ILIM bit. In this condition, the PDC voltage will
build up and must be managed through the system loop by
reducing the transmitted power. If the transmitted power
is not reduced, the TS51111 power dissipation will increase
and eventually force a thermal shutdown of the part. Current
limit in direct charge mode is not integrated but can be easily
implemented by monitoring device output current using the
integrated current sense amplifiers.
ILIMSET<3:0>
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Current Limit Typical (mA)
350
600
850
1100
1350
1600
1850
2100
2350
2600
2850
3100
3350
3600
3850
Disable ILIM
Precharge
In low battery conditions, an integrated precharge current
source can be used to slowly charge the battery with a
controlled DC current source. The precharge current source is
controlled using the I2C interface. The precharge current has a
negative temperature coefficient to mitigate temperature rise
of the TS51111 during pre-charge. The level of the Precharge
current can be set according to the table below.
PRESET<2:0>
000
001
010
011
100
101
110
111
Precharge Current (mA)
30
40
50
60
70
80
90
100
Low Power Mode
The TS51111 supports a low-power mode when connected
directly to a battery. In this mode, the ultra-low quiescent
current LDO output is enabled to power an external
microcontroller and the power consumption of the rest of
the IC is minimized. In this mode, the TS51111 still supports
UART level translation to the microcontroller. The part will
automatically switch to normal operation when incoming
power is detected.
Current Sense Amps
Two current sense amplifiers are included to allow for accurate
battery charge current and received current measurements.
The IBSENSE amplifier provides an output that is proportional
to the sense voltage on the PACKN pin when a sense resistor
is placed between PACKN and ground. The IOSENSE amplifier
will measure the differential voltage across the sense resistor
placed in series with the output current. This measurement
is an indicator of the power received by the TS51111. The
IOSENSE output is not valid when the device is in current limit.
The system should check the FAULT register periodically to
ensure the device is in a proper operating state without any
faults. Both amplifiers have a configurable gain set by the ISET
register. The gains are configurable from 10x to 80x.
TS51111
Final Datasheet
April 17, 2015
Rev 2.2
www.semtech.com
11 of 22
Semtech
Proprietary & Confidential
11 Page | ||
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