ACT2801/ACT2801B/ACT2801C
Rev 9, 14-Mar-17
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:
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:
VBATLED4(V ) 3.5(V ) 0.01(mA) RBLVS(k )
(2)
Input
Output
VOUT
VIN
Cout
L
VBAT (V ) 4.1(V ) Rbtv 4 106(V )
(1)
Rcs
SW
Rbtv is selected based on the battery voltage rating.
1% accuracy resistor is recommended for Rbtv.
RBLVS
Battery
BLVS
BAT
Input
Output
Cout
VIN
Figure 6. Battery level voltage shift setting circuit
Io
L
Rcs
SW
Rbtv
As long as LED4 is set, all the other 3 LED
thresholds is fixed as shown in the table 3:
BTV
Battery
CSP
CSN
Table 3: 4 LED Voltage Thresholds
RBLVS (ohm)
50K
60K
70K
80K
LED1
3.35V
3.60V
3.75V
4.00V
3.45V
3.70V
3.85V
4.10V
3.55V
3.80V
3.95V
4.20V
3.65V
3.90V
4.05V
4.30V
Figure 5. Battery terminal voltage setting circuit
LED2
LED3
LED Status Indication
LED4
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.
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:
Battery level voltage shift (BLVS pin)
LED1-4 voltage thresholds are adjusted from HZ
mode during charging and discharging based on
2.4 (V)
RILIM (k )
IILIM (A)
(3)
Table2: LED Indication
(Boost or HZ Mode)
ACT2801QL-T1028 / ACT2801CQL-
Charge Mode
T1028 :PB time > 30ms
LED
LED1
LED2
LED3
LED4
LED1
LED2
LED3
LED4
VBAT<2.9V
2.9V≤VBAT<LED1
LED1≤VBAT<LED2
LED2≤VBAT<LED3
LED3≤VBAT<LED4
VBAT≥LED4
Flash
Flash
On
Off
Off
Off
Off
Off
Off
Off
Flash
On
Off
Off
Off
On
On
On
On
Off
Off
Off
Off
On
On
On
Off
Off
Off
Off
Off
On
On
Flash
On
Off
Off
On
Flash
On
Off
On
On
On
Flash
Flash
On
On
On
On
On
On
VBAT≥LED4 (End of Charge)
On
On
On
On
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