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ACT2801 датащи(PDF) 14 Page - Active-Semi, Inc

номер детали ACT2801
подробное описание детали  5V/1.5A Backup Battery Pack Manager
PDF  25 Pages
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производитель  ACTIVE-SEMI [Active-Semi, Inc]
домашняя страница  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2801 датащи(HTML) 14 Page - Active-Semi, Inc

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Rev 8, 01-Nov-16
Innovative PowerTM
- 14 -
www.active-semi.com
Copyright © 2016 Active-Semi, Inc.
ACT2801/ACT2801B
Input current limit at various resistor curve is shown
in Figure 8.
The ILIM pin voltage is proportional to input current
until input current is limited, as shown in Figure 9.
In application, if fast charge current setting is higher
than input current limit, must be parallel a 0.47uF
capacitor with RILIM as shown in Figure 10.
Battery Fast Charge Current
Battery fast charge current is set by a resistor
connected from ICST pin to AGND as shown in
Figure 11. Figure 12 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 13. The
boost output current is estimated as the following
equation:
Figure 14 gives out boost output current with
various RIOST.
)
(m
s
Rc
)
(k
R
)
A
(
3
2
(A)
I
OST
I
IOST
(5)
Figure 13.
Boost output current setting circuit
Figure 7.
Input current limit setting circuit
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
(4)
)
m
(
Rcs
)
k
(
R
)
A
(
25
.
1
)
A
(
Ic
ICST
Figure 11.
Battery fast charge current setting
Figure 12.
Battery fast charge current 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 14.
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
Input current (A)
0
0.2
0.4
1.0
1.2
1.4
1.6
0.6
0.8
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
Figure 9.
VILIM VS. input current
VIN = 5.0V
RILIM=1.5kΩ
VIN = 5.0V
Vbat=3.7V
VIN = 5.0V
VBAT = 3.7V
CVout=4.5V
Figure 10.
Input current limit smaller than fast charge current



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