BQ25101H_15 Datasheet, PDF (22/32 Pages) Texas Instruments – bq2510x 250-mA Single Cell Li-Ion Battery Chargers, 1-mA Termination, 75-nA Battery Leakage

bq25100, bq25101, bq25100A, bq25100H, bq25101H, bq25100L
SLUSBV8C – AUGUST 2014 – REVISED NOVEMBER 2014
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s 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 bq2510x series of devices are highly integrated Li-Ion and Li-Pol linear chargers targeted at space-limited
portable applications. The fast charge current can be programmed from 10 mA to 250 mA through an external
resistor on ISET pin. The pre_charge and termination current can also be programmed through the resistor
connected on PRETERM pin. The device has complete system-level protection such as input under-voltage
lockout (UVLO), input over-voltage protection (OVP), sleep mode, thermal regulation, safety timers, and NTC
monitoring input.
9.2 Typical Application - Charger Application Design Example
USB Port or
Adapter
VBUS
D+
D-
GND
1ÛF
Optional ^2.7kŸ
RC
3.4kŸ
10 nF
6kŸ
IN
VSS
ISET
PRETERM
OUT
TS
bq25100
1ÛF
TEMP
PACK+
PACK-
SYSTEM
HOST
CE
9.2.1 Design Requirements
• Supply voltage = 5 V
• Fast charge current: I_OUT-FC = 40 mA;
• Termination Current Threshold: %_IOUT-FC = 10% of Fast Charge or ~4 mA
• Pre-Charge Current by default is twice the termination Current or ~8 mA
• TS – Battery Temperature Sense = 10-k NTC (103AT)
• /CE is an open drain control pin
9.2.2 Detailed Design Procedures
• The regulation voltage is set to 4.2 V, the input voltage is 5 V and the charge current is programmed to 40
mA.
• For charge current that is below 50 mA, an extra RC circuit is recommended on ISET to acheive more stable
current signal. For applications that need higher charge current, the RC circuit is not needed.
• For applications that use more than 200-mA current, there could be a very low level ~1% of charge current
ringing in the output. The ringing can be removed by increasing the input capacitance.
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