LTC4065EDC View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC4065EDC Datasheet PDF : 16 Pages
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LTC4065/LTC4065A
U
OPERATIO
POWER
ON
ENABLE
IS EN > SHUTDOWN
THRESHOLD?
YES
SHUTDOWN MODE
CHRG HIGH IMPEDANCE
UVLO
NO
IF VCC > 3.6V AND
VCC > VBAT + 80mV?
YES
UVLO MODE
NO
CHRG HIGH IMPEDANCE
VBAT ≤ 2.9V
2.9V < VBAT < 4.1V
TRICKLE CHARGE MODE
1/10 FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
FAST CHARGE MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
1/4 CHARGE CYCLE
NO CHARGE CYCLE
NO
(1.125 HOURS)
(4.5 HOURS)
DEFECTIVE BATTERY
IS VBAT < 2.9V?
RECHARGE
IS VBAT < 4.1V?
VBAT > 4.1V
STANDBY MODE
NO CHARGE CURRENT
CHRG HIGH IMPEDANCE
YES
BAD BATTERY MODE
NO CHARGE CURRENT
CHRG PULSES (2Hz)
VCC < 3V
OR
EN > SHDN
THRESHOLD
YES
RECHARGE MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
1/2 CHARGE CYCLE
(2.25 HOURS)
4065 F02
Figure 2. State Diagram of LTC4065 Operation
Transconductance amplifier, TA, limits the die tempera-
ture to approximately 115°C when in constant-tempera-
ture mode. Diode D3 ensures that TA does not affect the
charge current when the die temperature is below approxi-
mately 115°C. The PROG pin voltage continues to give an
indication of the charge current.
In typical operation, the charge cycle begins in constant-
current mode with the current delivered to the battery
equal to 1000V/RPROG. If the power dissipation of the
LTC4065/LTC4065A results in the junction temperature
approaching 115°C, the amplifier (TA) will begin decreas-
ing the charge current to limit the die temperature to
approximately 115°C. As the battery voltage rises, the
LTC4065/LTC4065A either return to constant-current mode
or enter constant-voltage mode straight from constant-
temperature mode. Regardless of mode, the voltage at the
PROG pin is proportional to the current delivered to the
battery.
4065f
12
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