BQ24165_14 Datasheet, PDF (21/38 Pages) Texas Instruments – 2.5A, Dual-Input, Single Cell Switch Mode Li-Ion Battery Charger with Power Path Management

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DISABLE
VDRV
TS COLD
+
bq24165
bq24166
bq24167
SLUSAP4B – DECEMBER 2011 – REVISED MARCH 2013
bq24166
TS HOT
+
VBAT(REG) 1xCharge/
DISABLE –140 mV 0.5xCharge
TS COLD
+
TS COOL ₊
TS WARM ₊
TS HOT ₊
bq24167
VDRV
RHI
TS
TEMP
PACK +
RLO
PACK -
VDRV
VDRV
RHI
TS
PACK +
TEMP
RLO
PACK -
Figure 23. TS Circuits
THERMAL REGULATION AND PROTECTION
During the charging process, to prevent the IC from overheating, bq24165/6/7 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_CF.
The charge current is reduced to zero when the junction temperature increases about 10°C above T_CF. 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 bq24165/6/7 if the die temperature rises too high. At any
state, if T_J exceeds T_SHTDWN, bq24165/6/7 suspends charging and disables the buck converter. During thermal
shutdown mode, PWM is turned off, and the timer is reset. The charging cycle resets when T_J falls below
T_SHTDWN by approximately 10°C.
INPUT VOLTAGE PROTECTION IN CHARGE MODE
Sleep Mode
The bq24165/6/7 enters the low-power sleep mode if the voltage on V_SUPPLY falls below 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 bq24165/6/7 turns
off the PWM converter, and turns the battery FET and BGATE on. Once V_SUPPLY > V_BAT+ V_SLP, the device
initiates a new charge cycle.
Copyright © 2011–2013, Texas Instruments Incorporated
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