BQ24050 Datasheet, PDF (22/37 Pages) Texas Instruments – 800mA Single Cell Li-Ion Battery Charger With Automatic Adaptor/USB Detection

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SLUS940A – SEPTEMBER 2009 – REVISED SEPTEMBER 2009.................................................................................................................................... www.ti.com
1.8
1.6
1.4
1.2
I_OUT Internal Clamp Range
1
0.8
max
0.6
I_SET Short
0.4
Fault
Range
0.2
min
I_OUT Programmed
Non Restricted
Operating Area
0
100
1000
I_SET - W
10000
Figure 27. PROGRAMMED / CLAMPED OUT CURRENT
PRE_TERM – Pre-Charge and Termination Programmable Threshold
Pre-Term is used to program both the pre-charge current and the termination current threshold, on the
bq24050/2/5. 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% 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 pre-charge-to-fast-charge, V_lowv
threshold is set to 2.5V.
R_PRE-TERM = %Term × K_TERM = %Pre-CHG × K_PRE-CHG
(0)
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 KPRE-CHG are gain factors found in the electrical specifications.
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