Datasheet

DISABLE
TEMP
PACK+
PACK-
+
+
+
+
TS COLD
TS HOT
TS WARM
TS COOL
TS
RHI
RLO
V
-140 mV
BAT(REG)
1 x Charge/
0.5 x Charge
V
DRV
V
DRV
bq2416x
RLO 0.383 RHI
RW ARM =
RLO RLO 0.383 RHI 0.383
´ ´
- ´ - ´
RLO 0.564 RHI
RCOOL =
RLO RLO 0.564 RHI 0.564
´ ´
- ´ - ´
bq24160, bq24160A
bq24161, bq24161B
bq24163, bq24168
www.ti.com SLUSAO0E –NOVEMBER 2011–REVISED NOVEMBER 2013
Where R
HOT
is the NTC resistance at the hot temperature and R
COLD
is the NTC resistance at cold temperature.
For the bq24160, bq24161B, bq24163, and bq24168, the WARM and COOL thresholds are not independently
programmable. The COOL and WARM NTC resistances for a selected resistor divider are calculated using the
following equations:
(3)
(4)
Figure 26. TS Circuit
Thermal Regulation and Protection
During the charging process, to prevent chip overheating, the bq2416x monitors the junction temperature, T
J
, of
the die and begins to taper down the charge current once T
J
reaches the thermal regulation threshold, T
REG
. The
charge current is reduced to zero when the junction temperature increases about 10°C above T
REG
. Once the
charge current is reduced, the system current is reduced while the battery supplements the load to supply the
system. This may cause a thermal shutdown of the bq2416x if the die temperature rises too high. At any state, if
T
J
exceeds T
SHTDWN
, the bq2416x suspends charging and disables the buck converter. During thermal shutdown
mode, the buck converter is turned off, all timers are suspended, and a single 128μs pulse is sent on the STAT
and INT outputs and the STATx and FAULT_x bits of the status registers are updated in the I
2
C. A new charging
cycle begins when T
J
falls below T
SHTDWN
by approximately 10°C.
Input Voltage Protection in Charge Mode
Sleep Mode
The bq2416x enters the low-power sleep mode if the voltage on V
SUPPLY
falls below the sleep-mode entry
threshold, V
BAT
+V
SLP
, and V
SUPPLY
is higher than the undervoltage lockout threshold, V
UVLO
. This feature
prevents draining the battery during the absence of V
SUPPLY
. When V
SUPPLY
< V
BAT
+ V
SLP
, the bq2416x turns off
the PWM converter, turns the battery FET on and drives BGATE to GND, sends a single 128μs pulse on the
STAT and INT outputs and updates the STATx and FAULT_x bits in the status registers. Once V
SUPPLY
> V
BAT
+
V
SLP
, the STATx and FAULT_x bits are cleared and the device initiates a new charge cycle.
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Product Folder Links: bq24160 bq24160A bq24161 bq24161B bq24163 bq24168