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| BQ24040_16 Datasheet, PDF (21/38 Pages) Texas Instruments – Single Cell Li-Ion and Li-Pol Battery Charger With Auto Start | |||
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9 Application and Implementation
bq24040, bq24041, bq24045
SLUS941F â SEPTEMBER 2009 â REVISED MARCH 2015
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TIâs customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The bq2404x series of devices are highly integrated Li-Ion and Li-Pol linear chargers devices targeted at space-
limited portable applications. The devices operate from either a USB port or AC adapter. The high input voltage
range with input overvoltage protection supports low-cost unregulated adapters. These devices have a single
power output that charges the battery. A system load can be placed in parallel with the battery as long as the
average system load does not keep the battery from charging fully during the 10 hour safety timer.
9.2 Typical Applications
9.2.1 Typical Application: bq24040 and bq24045
IOUT_FAST_CHG = 540mA; IOUT_PRE_CHG = 108mA; IOUT_TERM = 54mA
1.5kW
Adaptor
DC+
GND
OR
USB Port
VBUS
GND
D+
D-
bq24040 and bq24045
1kW
1mF
1 IN
2 ISET
3 VSS
OUT 10
1.5kW
TS 9
CHG 8
Battery Pack
++
4 PRETERM ISET2 7
System Load
1mF
5 PG
2kW
NC 6
Disconnect after Detection
VDD
TTDM/BAT_EN
ISET/100/500 mA
GND
D+
D-
Host
Figure 15. Typical Application Circuit: bq24040 and bq24045
9.2.1.1 Design Requirements
⢠Supply voltage = 5 V
⢠Fast charge current: IOUT-FC = 540 mA; ISET-terminal 2
⢠Termination Current Threshold: %IOUT-FC = 10% of Fast Charge or ~54mA
⢠Pre-Charge Current by default is twice the termination Current or ~108mA
⢠TS â Battery Temperature Sense = 10k NTC (103AT)
Copyright © 2009â2015, Texas Instruments Incorporated
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Product Folder Links: bq24040 bq24041 bq24045
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