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ACT2801 датащи(PDF) 15 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) 15 Page - Active-Semi, Inc

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Rev 9, 14-Mar-17
Innovative PowerTM
- 15 -
www.active-semi.com
Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
The IOST pin voltage is proportional to output
current until output current is limited, as shown in
Figure 15.
Battery
Impedance Compensation
An
external resistor is used to set the impedance
from 40mΩ to 500mΩ as shown in Figure 16. 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:
Table 4: Battery Impedance
Input Over Voltage Surge
In the case of pure ceramic input capacitor is
chosen, if the input cable is long, stray inductance
may cause over voltage spikes as twice as the
steady-state voltage when input source is plugged
in. Below input circuit is recommended to avoid
input voltage surge. R1 resistor is added in series
with capacitor C1 to damp the potential LC
resonance as shown in Figure 17.
Boost Output Plug-in Auto Detection
Figure 18 provides a solution for auto plug-in
detection.
External Input Over Voltage Protection
Considering the maximum voltage rating at VIN pin,
the external OVP circuit as shown in Figure 19 is
recommended if input voltage may go higher than
7V. With the enhanced OVP circuit, the design can
pass UN38.3.
Inductor and Capacitor Selection
ACT2801/ACT2801B/ACT2801C
supports
SMD
components. 2.2uH
inductor is recommended.
Input side, 4.7uF ceramic capacitor in series with
2.7Ω resistor are recommended, on battery side,
22uF ceramic capacitors is recommended while on
output side, 2*22uF ceramic capacitors are
recommended.
Battery Temperature Monitoring
ACT2801 continuously monitors the temperature of
the battery pack by sensing the resistance of its
thermistor,
and
suspends
charging
if
the
temperature of the battery pack exceeds the safety
900
750
600
450
300
150
0
Output current(A)
0
0.2
0.4
0.6
0.8
1.0
1.2
Figure 15.
VIOST VS. output current
VBAT = 3.7V
RIOST=97.6kΩ
)
(m
cs
R
)
(m
R
25
)
(k
RIMC
(7)
(6)
VIN
Input
VOUT
Rcs
SW
L
Output
Battery
package
R:
Battery Impedance
R
BAT
Cout
RIMC
RIMC
IBAT
Figure 16.
Battery impedance compensation setting circuit
3
-
BAT
BAT
10
)
m
(
R
)
A
(
I
)
V
(
BAT
)
V
(
V
RIMC(KΩ)
50
100
200
Battery
Impedance
R(mΩ)
Rcs=25mΩ
50
100
200
Rcs=50mΩ
100
200
400
VIN
Rcs
50mΩ
SW
Battery
BAT
L 2.2uH
C1 4.7uF
R1 2.7Ω
Input
Figure 17. Input over voltage surge protection circuit
HZ
PB
Rcs
50mΩ
SW
Battery
BAT
L 2.2uH
+
-
D+
D-
COUT
VOUT
2.2uF
USB Shielding Ground
PB
2.2uF
715K
200K
VBAT
715K
Figure 18.
Boost output auto detection circuit
Figure 19.
Input over voltage protection
D1
5.6V
10k
10k
Si2365EDS
VIN
Input
3906
Q1
Q2
2.7Ω
4.7uF
4.7k



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