BQ24160 Datasheet, PDF (23/44 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switchmode Li-Ion Battery Charger with Power Path

bq24160, bq24161
bq24163, bq24168
www.ti.com
SLUSAO0A – NOVEMBER 2011 – REVISED MARCH 2012
Where R_HOT is the NTC resistance at the hot temperature and R_COLD is the NTC resistance at cold temperature.
For the bq24160/3/8, 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:
RCOOL =
RLO ´ 0.564 ´ RHI
RLO - RLO ´ 0.564 - RHI ´ 0.564
(3)
RW ARM =
RLO ´ 0.383 ´ RHI
RLO - RLO ´ 0.383 - RHI ´ 0.383
(4)
V_{BAT(REG) 1 x Charge/}
DISABLE -140 mV 0.5 x Charge
V_DRV
bq2416x
TS COLD
+
TS COOL
+
TS WARM ₊
TS HOT
+
V_DRV
RHI
TS
TEMP
PACK +
RLO
PACK -
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 I²C. 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.
Copyright © 2011–2012, Texas Instruments Incorporated
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