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ACT2801 Datasheet(PDF) 13 Page - Active-Semi, Inc

Part # ACT2801
Description  5V/1.5A Backup Battery Pack Manager
PDF  23 Pages
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Manufacturer  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2801 Datasheet(HTML) 13 Page - Active-Semi, Inc

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Rev 2, 15-Apr-14
Innovative PowerTM
- 13 -
www.active-semi.com
Copyright © 2014 Active-Semi, Inc.
ACT2801/ACT2801C
Input current limit at various resistor curve is shown
in Figure 8.
Battery Fast Charge Current
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
Figure 9. Figure 10 gives out different fast charge
current with various RICST. The battery fast charge
current is estimated as the following equation:
Boost Output Constant Current
Boost output current is set by a resistor connected
from IOST pin to AGND as shown in Figure 11. The
boost output current is estimated as the following
equation:
Figure 12 gives out boost output current with
various RIOST.
Battery Impedance Compensation
An
external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 13. 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:
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
)
(m
cs
R
)
(m
R
25
)
(k
RIMC
Ω
Ω
Ω
×
=
)
(m
s
Rc
)
(k
R
)
A
(
3
2
(A)
I
OST
I
IOST
Ω
Ω
×
=
(5)
(7)
(4)
)
m
(
Rcs
)
k
(
R
)
A
(
25
.
1
)
A
(
Ic
ICST
Ω
Ω
×
=
Figure 11.
Boost output current setting circuit
(6)
Figure 13.
Battery impedance compensation setting circuit
3
-
BAT
BAT
10
)
m
(
R
)
A
(
I
)
V
(
BAT
)
V
(
V
×
×
−
=
Ω
Figure 9.
Battery fast charge current setting circuit
Figure 7.
Input current limit setting circuit
Figure 10.
Battery fast charge current setting
3.0
1.5
1.0
0.5
0
2.0
2.5
RILIM (kΩ)
0.7
1.2
1.7
2.2
2.7
3.2
3.7
4.2
4.7
Figure 8.
Input current limit setting
RICST (kΩ)
0
10
20
30
40
50
60
70
80
2.1
0.9
0.6
0.3
0
1.2
1.5
1.8
Figure 12.
Boost output current setting
1.9
1.6
1.3
1.0
0.7
0.4
RIOST (kΩ)
20
40
60
80
100
120
140



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