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TS51111 Arkusz danych(PDF) 11 Page - Semtech Corporation

Numer części TS51111
Szczegółowy opis  High Efficiency Synchronous Rectifier and Charging IC for Wireless Power Applications
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Producent  SEMTECH [Semtech Corporation]
Strona internetowa  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

TS51111 Arkusz danych(HTML) 11 Page - Semtech Corporation

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TS51111
Final Datasheet
Rev 2.2
April 17, 2015
www.semtech.com
11 of 22
Semtech
Proprietary & Confidential
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>
Current Limit Typical (mA)
0000
350
0001
600
0010
850
0011
1100
0100
1350
0101
1600
0110
1850
0111
2100
1000
2350
1001
2600
1010
2850
1011
3100
1100
3350
1101
3600
1110
3850
1111
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>
Precharge Current (mA)
000
30
001
40
010
50
011
60
100
70
101
80
110
90
111
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.


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