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| BQ29311_15 Datasheet, PDF (8/24 Pages) Texas Instruments – FOUR-CELL LITHIUM-ION | |||
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Not Recommended for New Designs
bq29311
SLUS487D â DECEMBER 2001 â REVISED NOVEMBER 2003
APPLICATION INFORMATION
www.ti.com
PRECHARGE MODE CURRENT LIMITING RESISTOR SELECTION
The selection of this resistor value should take into account the maximum potential charge voltage, which should include
the voltage of a failed charger to ensure that 0-V and pre-charge mode current levels are within desirable limits under all
conditions.
I(PCHG)
BAT
RDS(ON)
R(PCHG)
22
PCHG
PACK+
I (PCHG)
+
VPACK(max) * VBAT(min)
RDS(ON) ) R(PCHG)
UDGâ01148
Figure 1. Pre-Charge Mode Current Limiting Resistor Selection
This method ensures that the resistor is sized correctly to provide safe zero voltage charging and the optimal performance
during precharge.
8
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