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LTC4065LEDC 数据表(PDF) 12 Page - Linear Integrated Systems

部件名 LTC4065LEDC
功能描述  Standalone 750mA Li-Ion Battery Charger in 2 2 DFN
PDF  16 Pages
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制造商  LINEAR [Linear Integrated Systems]
网页  http://www.linearsystems.com
标志 LINEAR - Linear Integrated Systems

LTC4065LEDC 数据表(HTML) 12 Page - Linear Integrated Systems

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12
LTC4065/LTC4065A
4065fb
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.
OPERATIO
IS EN > SHUTDOWN
THRESHOLD?
ENABLE
CHRG HIGH IMPEDANCE
SHUTDOWN MODE
IF VCC > 3.6V AND
VCC > VBAT + 80mV?
UVLO
UVLO MODE
1/10 FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
TRICKLE CHARGE MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
FAST CHARGE MODE
IS VBAT < 2.9V?
DEFECTIVE BATTERY
IS VBAT < 4.1V?
RECHARGE
NO CHARGE CURRENT
CHRG PULSES (2Hz)
BAD BATTERY MODE
FULL CHARGE CURRENT
CHRG STRONG PULL-DOWN
RECHARGE MODE
NO CHARGE CURRENT
CHRG HIGH IMPEDANCE
STANDBY MODE
CHRG HIGH IMPEDANCE
NO
YES
YES
YES
NO
NO
4065 F02
VBAT ≤ 2.9V
1/4 CHARGE CYCLE
(1.125 HOURS)
VCC < 3V
OR
EN > SHDN
THRESHOLD
CHARGE CYCLE
(4.5 HOURS)
1/2 CHARGE CYCLE
(2.25 HOURS)
2.9V < VBAT < 4.1V
VBAT > 4.1V
YES
NO
POWER
ON
Figure 2. State Diagram of LTC4065 Operation



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