LTC4065L/
LTC4065LX/LTC4065L-4.1
OPERATION
ENABLE
POWER
ON
IS
EN
> SHUTDOWN
THRESHOLD?
YES
SHUTDOWN MODE
CHRG
HIGH IMPEDANCE
NO
IF V
CC
> 3.6V AND
V
CC
> V
BAT
+ 80mV?
YES
UVLO
NO
UVLO MODE
CHRG
HIGH IMPEDANCE
V
BAT
≤ 2.9V
TRICKLE CHARGE MODE*
1/10 FULL CHARGE CURRENT
CHRG
STRONG PULL-DOWN
1/4 CHARGE CYCLE
(1.125 HOURS)
DEFECTIVE BATTERY
IS V
BAT
< 2.9V?
NO
2.9V < V
BAT
< 4.1V (LTC4065L/LTC4065LX)
2.9V < V
BAT
< 4.0V (LTC4065L-4.1)
FAST CHARGE MODE
FULL CHARGE CURRENT
CHRG
STRONG PULL-DOWN
CHARGE CYCLE
(4.5 HOURS)
RECHARGE
IS V
BAT
< 4.1V? (LTC4065L/LTC4065LX)
IS V
BAT
< 4.0V? (LTC4065L-4.1)
NO
V
BAT
> 4.1V (LTC4065L/LTC4065LX)
V
BAT
> 4.0V (LTC4065L-4.1)
STANDBY MODE
NO CHARGE CURRENT
CHRG
HIGH IMPEDANCE
YES
BAD BATTERY MODE
NO CHARGE CURRENT
CHRG
PULSES (2Hz)
V
CC
< 3V
OR
EN
> SHDN
THRESHOLD
YES
RECHARGE MODE
FULL CHARGE CURRENT
CHRG
STRONG PULL-DOWN
1/2 CHARGE CYCLE
(2.25 HOURS)
4065L F02
*LTC4065L and LTC4065L-4.1 ONLY; LTC4065LX HAS FULL CHARGE CURRENT.
Figure 2. State Diagram of LTC4065L Operation
4065lfb
12
LINEAR [ LINEAR INTEGRATED SYSTEMS ]
