Datasheet

V
O(REG)
I
O(CHG)
V
(LOWV)
PRECHARGE CCFAST
CHARGE
CVTAPER DONE
Battery
Voltage
Battery
Current
TERMCURRENT=1
THERMAL
REGULATION
T
J(REG)
ICjunction
temperature,T
J
I
(TERM)
I
(PRECHG)
TPS65070, TPS65072, TPS65073
TPS650731, TPS650732, TPS650701, TPS650702, TPS650721
SLVS950G –JULY 2009–REVISED MAY 2013 www.ti.com
Figure 28. Thermal Loop
Timer Fault:
The following events generate a fault status:
1. If the battery voltage does not exceed V
LOWV
in time t
PRECHG
during pre-charging
2. If the battery current does not reach I
TERM
in time t
MAXCH
in fast charge (measured from beginning of fast
charge).
The fault status is indicated by Bits CHG TIMEOUT or PRECHG TIMEOUT in register CHGCONFIG0 set to 1.
BATTERY PACK TEMPERATURE MONITORING
The device has a TS pin that connects to the NTC resistor in the battery pack. During charging, if the resistance
of the NTC indicates that the battery is operating outside the limits of safe operation, charging is turned off. All
timers maintain their values. When the battery pack temperature returns to a safe value, charging is resumed,
and the timers are also turned back on.
Battery pack temperature sensing is disabled when termination is disabled and the voltage on the TS pin is
higher than V
DIS(TS)
(caused by absence of pack and thus absence of NTC).
The default for the NTC is defined in register CHGCONFIG1 with Bit SENSOR TYPE as a 10k curve 2 NTC. The
sensor can be changed to a 100k curve 1 NTC by setting the Bit to 0.
There needs to be a resistor in parallel to the NTC for linearization of the temperature curve. The value for the
resistor is given in the table below:
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