ACT2802
Rev 0, 21-Jan-14
from IOST pin to AGND as shown in Figure 10. The
boost output current is estimated as the following
equation:
2
RIOST (k )
Rcs (m )
IIOST (A) ( A)
(5)
3
Figure 6. Input current limit setting circuit
Input current limit at various resistor curve is shown
in Figure 7.
3.5
3.0
2.5
2.0
Figure 10. Boost output current setting circuit
Figure 11 gives out boost output current with
various RIOST
.
1.5
1.0
0.5
3.0
2.5
0.6
1.0
1.4
1.8
2.2
2.6
3.0
2.0
1.5
1.0
0.5
RILIM (kΩ)
Figure 7. Input current limit setting
Battery Fast Charge Current
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
Figure 8. Figure 9 gives out different fast charge
current with various RICST. The battery fast charge
current is estimated as the following equation:
0
0
20
40
60
80
100
RIOST (kΩ)
Figure 11. Boost output current setting
Battery Impedance Compensation
RICST (k)
Rcs (m)
Ic(A) 1.25(A)
(4)
An external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 12. RIMC
is corresponding to battery impedance. Higher RIMC
gives higher compensation voltage which is
positively proportional to battery charge/discharge
current.
Select RIMC based on battery impedance:
25 R (m )
Rcs (m )
(6)
(7)
R
IMC (k )
Figure 8. Battery fast charge current setting circuit
VBAT (V) BAT(V) IBAT (A)R(m)10-3
3.0
2.5
2.0
1.5
1.0
0.5
0
0
10
20
30
40
50
60
RICST (kΩ)
Figure 12. Battery impedance compensation setting circuit
Figure 9. Battery fast charge current setting
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
Boost Output Constant Current
Boost output current is set by a resistor connected
Innovative PowerTM
- 12 -
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