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ACT2801 Scheda tecnica(PDF) 14 Page - Active-Semi, Inc

Il numero della parte ACT2801
Spiegazioni elettronici  5V/1.5A Backup Battery Pack Manager
PDF  25 Pages
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Produttore elettronici  ACTIVE-SEMI [Active-Semi, Inc]
Homepage  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2801 Scheda tecnica(HTML) 14 Page - Active-Semi, Inc

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Rev 9, 14-Mar-17
Innovative PowerTM
- 14 -
www.active-semi.com
Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
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.
The IOST
pin
)
(m
s
Rc
)
(k
R
)
A
(
3
2
(A)
I
OST
I
IOST
(5)
Figure 13.
Boost output current setting circuit
VIN
Input
VOUT
Rcs
50mΩ
SW
L
Output
Cout
RILIM
ILIM
Iin
Battery
Figure 7.
Input current limit setting circuit
3.0
2.5
2.0
1.5
1.0
0.5
0
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
VIN
Input
VOUT
Rcs
50mΩ
SW
L
Output
Battery
CSP
Cout
ICST
RICST
Ic
CSN
RIN
CIN
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
1.8
1.5
1.2
0.9
0.6
0.3
0
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
0.6
0.8
1.0
1.2
1.4
1.6
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
Rcs
50mΩ
SW
L
Output
Battery
Cout
CSP
CSN
IOST
RIOST
Io
VOUT
VBAT = 3.7V
CVout=4.5V
VIN
Input
VOUT
Rcs
50mΩ
SW
L
Output
Cout
RILIM
ILIM
Iin
Battery
CILIM
Figure 10.
Input current limit smaller than fast charge current



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