LTC4096EDD 데이터 시트보기 (PDF) - Linear Technology
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LTC4096EDD Datasheet PDF : 16 Pages
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LTC4096/LTC4096X
APPLICATIONS INFORMATION
Manual Shutdown
The SUSP pin has a 3.4MΩ pulldown resistor to GND. A
logic low enables the charger and logic high disables it
(the pulldown defaults the charger to the charging state).
The DCIN input draws 20µA when the charger is in shut-
down. The USBIN input draws 20µA during shutdown if
no power is applied to DCIN, but draws only 10µA when
VDCIN > VUSBIN.
Thermal Limiting
An internal thermal feedback loop reduces the programmed
charge current if the die temperature attempts to rise
above a preset value of approximately 115°C. This feature
protects the LTC4096 from excessive temperature and
allows the user to push the limits of the power handling
capability of a given circuit board without risk of damag-
ing the device. The charge current can be set according
to typical (not worst case) ambient temperature with the
assurance that the charger will automatically reduce the
current in worst case conditions. A safety thermal shut
down circuit will turn off the charger if the die temperature
rises above a value of approximately 150°C. DFN power
considerations are discussed further in the Applications
Information section.
STARTUP
DCIN POWER APPLIED
ONLY USB POWER APPLIED
POWER SELECTION
BAT < 2.9V
TRICKLE CHARGE*
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: DCIN
2.9V < BAT
BAT > 2.9V
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: DCIN
IBAT < ITERMINATE
IN VOLTAGE MODE
DCIN POWER
REMOVED
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
TRICKLE CHARGE*
MODE
1/10th FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: USBIN
BAT > 2.9V
CHARGE
MODE
FULL CURRENT
CHRG STATE: PULLDOWN
PWR STATE: USBIN
BAT < 2.9V
2.9V < BAT
IBAT < ITERMINATE
IN VOLTAGE MODE
BAT < 4.15V
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
PWR STATE: DCIN
STANDBY
MODE
NO CHARGE CURRENT
CHRG STATE: Hi-Z
PWR STATE: USBIN
BAT < 4.15V
SUSP
DRIVEN LOW
SHUTDOWN
MODE
IDCIN DROPS TO 20µA
CHRG STATE: Hi-Z
PWR STATE: DCIN
*NOT PRESENT IN THE "X" VERSION
SUSP
DRIVEN HIGH
DCIN POWER
REMOVED
SUSP
DRIVEN HIGH
USBIN POWER
REMOVED OR
DCIN POWER
APPLIED
SHUTDOWN
MODE
IUSBIN DROPS TO 20µA
SUSP
DRIVEN LOW
CHRG STATE: Hi-Z
PWR STATE: USBIN
4096 F01
Figure 1. LTC4096 State Diagram of a Charge Cycle
4096xf
11
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