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ACT2801 数据表(PDF) 13 Page - Active-Semi, Inc

部件名 ACT2801
功能描述  5V/1.5A Backup Battery Pack Manager
PDF  25 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

ACT2801 数据表(HTML) 13 Page - Active-Semi, Inc

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Rev 9, 14-Mar-17
Innovative PowerTM
- 13 -
www.active-semi.com
Copyright © 2015-2017 Active-Semi, Inc.
ACT2801/ACT2801B/ACT2801C
APPLICATIONS INFORMATION
Battery Charge Termination Voltage
Battery charge termination voltage is set by a
resistor Rbtv connected from BTV pin to AGND as
shown in Figure 5. The battery charge termination
voltage is estimated as the following equation:
Rbtv is selected based on the battery voltage rating.
1% accuracy resistor is recommended for Rbtv.
LED Status Indication
4 LEDs ON/OFF and flash show the charge status
and the remained capacity level as shown in the
table 2. The LED status is based on battery voltage
and operation modes. When battery voltage is low,
LED1 is flashing. In charge mode, when a battery is
fully charged, flashing stops and all the 4 LEDs are
solid on.
Battery level voltage shift (BLVS pin)
LED1-4 voltage thresholds are adjusted from HZ
mode during charging and discharging based on
the compensated impedance. Those thresholds are
programmed by a resistor connected from BLVS
pin to AGND as shown in Figure 6. The following
equation shows the LED4 voltage threshold:
As long as LED4 is set, all the other 3 LED
thresholds is fixed as shown in the table 3:
Table 3: 4 LED Voltage Thresholds
Input Current Limit
An external resistor is used to set the input current
limit connected from ILIM pin to AGND as shown in
Figure 7. Input current limit has built-in soft startup
and current foldback control loop. The input current
limit is estimated as the following equation:
RBLVS (ohm)
50K
60K
70K
80K
LED1
3.35V
3.45V
3.55V
3.65V
LED2
3.60V
3.70V
3.80V
3.90V
LED3
3.75V
3.85V
3.95V
4.05V
LED4
4.00V
4.10V
4.20V
4.30V
VIN
Input
Rcs
SW
L
Output
Battery
Cout
CSP
CSN
BTV
Rbtv
Io
Charge Mode
(Boost or HZ Mode)
ACT2801QL-T1028 / ACT2801CQL-
T1028 :PB time > 30ms
LED
LED1
LED2
LED3
LED4
LED1
LED2
LED3
LED4
VBAT<2.9V
Flash
Off
Off
Off
Off
Off
Off
Off
2.9V≤VBAT<LED1
Flash
Off
Off
Off
Flash
Off
Off
Off
LED1≤VBAT<LED2
On
Flash
Off
Off
On
Off
Off
Off
LED2≤VBAT<LED3
On
On
Flash
Off
On
On
Off
Off
LED3≤VBAT<LED4
On
On
On
Flash
On
On
On
Off
VBAT≥LED4
On
On
On
Flash
On
On
On
On
VBAT≥LED4 (End of Charge)
On
On
On
On
On
On
On
On
(2)
)
k
(
R
)
mA
(
01
.
0
)
V
(
5
.
3
)
V
(
V
BLVS
4
BATLED
(1)
)
V
(
10
4
R
)
V
(
1
.
4
)
V
(
V
6
btv
BAT
Figure 5.
Battery terminal voltage setting circuit
VIN
Input
VOUT
Rcs
SW
L
Output
Battery
BAT
Cout
BLVS
RBLVS
Figure 6.
Battery level voltage shift setting circuit
)
(k
R
(V)
4
.
2
(A)
I
ILIM
ILIM
(3)
Table2: LED Indication



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