BQ25100H_15 Datasheet, PDF (17/32 Pages) Texas Instruments – bq2510x 250-mA Single Cell Li-Ion Battery Chargers, 1-mA Termination, 75-nA Battery Leakage

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Feature Description (continued)
bq25100, bq25101, bq25100A, bq25100H, bq25101H, bq25100L
SLUSBV8C – AUGUST 2014 – REVISED NOVEMBER 2014
45C
Hot Fault
Charge Disable
10C
Programmed VBAT_REG
0C
No Operation
During Cold Fault
Programmed ICHG
(100%)
50%
Cold Fault
0
0.2
0.4
VHOT VWARM
0.6
0.8
1.0
1.2
1.4
1.6
1.8
VCOOL
TS Voltage-V
VCOLD
Termination
Disable
Figure 21. Operation Over TS Bias Voltage – bq25100A
8.3.7 PRE_TERM – Pre-Charge and Termination Programmable Threshold
Pre-Term is used to program both the pre-charge current and the termination current threshold. The pre-charge
current level is a factor of two higher than the termination current level. The termination can be set between 5
and 50% (recommended range) of the programmed output current level set by ISET. If left floating the
termination and pre-charge are set internally at 10/20% respectively. The R_PRE-TERM is ranged from 600 Ω to 30
kΩ and the minimum termination current can be programmed to 1 mA. The pre-charge-to-fast-charge, V_lowv
threshold is set to 2.5 V.
R_PRE-TERM = %Term × K_TERM = %Pre-CHG × K_PRE-CHG
(2)
Where:
%Term is the percent of fast charge current where termination occurs;
%Pre-CHG is the percent of fast charge current that is desired during precharge;
K_TERM and K_PRE-CHG are gain factors found in the electrical specifications.
8.3.8 TS
The TS function for the bq2510x family is designed to follow the new JEITA temperature standard
(bq25100/bq25100H/bq25101/bq25101H) for Li-Ion and Li-Pol batteries. There are now four thresholds, 60°C,
45°C, 10°C, and 0°C. Normal operation occurs between 10°C and 45°C. If between 0°C and 10°C the charge
current level is cut in half and if between 45°C and 60°C the regulation voltage is reduced to 4.1 V max for
bq25100 and 4.2 V max for bq25100H, see Figure 20. The TS function for the bq25100A cut the charge current
level in half between 0°C and 10°C and disables charging when the NTC temperature is above 45°C.
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