LTC4065-4.4 Linear Technology, LTC4065-4.4 Datasheet - Page 11

• Manufacturer Part Number: LTC4065-4.4
• Description: Standalone 750mA Li-Ion Battery Charge
• Manufacturer: Linear Technology

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OPERATIO
POWER
U
ON
1/4 CHARGE CYCLE
(1.125 HOURS)
THRESHOLD
IS EN > SHUTDOWN
THRESHOLD?
CHRG HIGH IMPEDANCE
1/10 FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
IS V
NO CHARGE CURRENT
CHRG PULSES (2Hz)
EN > SHDN
V
TRICKLE CHARGE MODE
CC
BAT
DEFECTIVE BATTERY
BAD BATTERY MODE
OR
SHUTDOWN MODE
< 3V
< 2.9V?
ENABLE
Figure 2. State Diagram of LTC4065-4.4 Operation
YES
V
YES
BAT
≤ 2.9V
NO
NO
1/2 CHARGE CYCLE
CHARGE CYCLE
(2.25 HOURS)
(4.5 HOURS)
IF V
V
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
IS V
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
CC
CC
BAT
> V
FAST CHARGE MODE
RECHARGE MODE
> 3.6V AND
BAT
< 4.3V?
RECHARGE
+ 80mV?
UVLO
2.9V < V
YES
YES
BAT
< 4.3V
NO
NO
CHRG HIGH IMPEDANCE
NO CHARGE CURRENT
CHRG HIGH IMPEDANCE
STANDBY MODE
UVLO MODE
V
BAT
LTC4065-4.4
> 4.3V
4065 F02
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