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ACT2802 数据表(PDF) 12 Page - Active-Semi, Inc

部件名 ACT2802
功能描述  5V/2.5A Backup Battery Pack Manager
PDF  21 Pages
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制造商  ACTIVE-SEMI [Active-Semi, Inc]
网页  http://www.active-semi.com
标志 ACTIVE-SEMI - Active-Semi, Inc

ACT2802 数据表(HTML) 12 Page - Active-Semi, Inc

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ACT2802
Rev 0, 21-Jan-14
Innovative PowerTM
- 12 -
www.active-semi.com
Copyright © 2013 Active-Semi, Inc.
Active-Semi Confidential―Do Not Copy or Distribute
ActiveSwitcher
TM is a trademark of Active-Semi.
Input current limit at various resistor curve is shown
in Figure 7.
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:
Boost Output Constant Current
Boost output current is set by a resistor connected
from IOST pin to AGND as shown in Figure 10. The
boost output current is estimated as the following
equation:
Figure 11 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 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:
The battery impedance as shown in the table 4
according to the RIMC and Rcs:
)
(m
cs
R
)
(m
R
)
(k
RIMC
25
)
(m
s
Rc
)
(k
R
A
(A)
I
OST
I
IOST
)
(
3
2
(5)
(7)
(4)
)
(
)
(
)
(
25
.
1
)
(
m
Rcs
k
R
A
A
Ic
ICST
Figure 10.
Boost output current setting circuit
(6)
Figure 12.
Battery impedance compensation setting circuit
3
10
)
(
)
(
)
(
)
(
-
BAT
BAT
m
R
A
I
V
BAT
V
V
Figure 8.
Battery fast charge current setting circuit
Figure 6.
Input current limit setting circuit
3.5
2.0
1.5
1.0
0.5
2.5
3.0
RILIM (kΩ)
0.6
1.0
1.4
1.8
2.2
2.6
3.0
Figure 7.
Input current limit setting
Figure 9.
Battery fast charge current setting
RICST (kΩ)
0
10
20
30
40
50
60
3.0
2.5
2.0
1.5
1.0
0.5
0
Figure 11.
Boost output current setting
2.5
2.0
1.5
1.0
0.5
0
3.0
RIOST (kΩ)
0
20
40
60
80
100



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