BQ24188_15 Datasheet, PDF (23/52 Pages) Texas Instruments – bq24188 2A, 30V, Host-Controlled Single-Input, Single Cell Switchmode Li-Ion Battery Charger with Power Path Management and USB-OTG Support

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bq24188
SLUSC44A – DECEMBER 2014 – REVISED MAY 2015
Device Functional Modes (continued)
RLO =
V_DRV
´ RCOLD
´ RHOT
´
é
ê
ë
1
V_COLD
-
1^ù
ú
V_{HOT û}
RHOT
´
é
ê
V_DRV
-
ù
1_ú
-
RCOLD
´
é
ê
VDRV
-
ù
1_ú
ë ^VHOT û
ë ^VCOLD û
(1)
RHI =
V_{DRV - 1}
V_COLD
1
1
+
RLO RCOLD
(2)
Where:
V_COLD = 0.60 × V_DRV
V_HOT = 0.30 × V_DRV
RCOOL =
RLO ´ RHI´ 0.564
RLO - RLO ´ 0.564 - RHI´ 0.564
(3)
RWARM =
RLO ´ RHI´ 0.383
RLO - RLO ´ 0.383 - RHI´ 0.383
(4)
Where RHOT is the NTC resistance at the hot temperature and RCOLD is the NTC resistance at cold
temperature.
The WARM and COOL thresholds are not independently programmable. The COOL and WARM NTC
resistances for a selected resistor divider are calculated using Equation 3 and Equation 4.
V_{BATREG 1 x Charge/}
DISABLE – 140 mV 0.5 x Charge
V_DRV
bq24188
TS COLD
+
TS COOL ₊
TS WARM ₊
TS HOT
+
V_DRV
RHI
TS
PACK+
TEMP
RLO
PACK–
Figure 14. TS Circuit
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