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AAT3680 Datasheet(Fiches technique) 6 Page - Advanced Analog Technology, Inc.

Numéro de pièce AAT3680
Description  Lithium-Ion/Polymer Linear Battery Charge Controller
Télécharger  18 Pages
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Fabricant  AAT [Advanced Analog Technology, Inc.]
Site Internet  http://www.aatech.com.tw
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 6 page
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AAT3680
Lithium-Ion/Polymer
Linear Battery Charge Controller
6
3680.2006.03.1.6
Constant Voltage Charging
When the battery voltage reaches V
CH during con-
stant current mode, the AAT3680 transitions to con-
stant voltage mode. The regulation voltage is fac-
tory programmed: 4.1V and 4.2V are available to
support different anode materials in lithium-ion/poly-
mer cells.
In constant voltage operation, the
AAT3680 monitors the cell voltage and terminates
the charging cycle when the voltage across R
SENSE
decreases to approximately 10mV.
Charge Cycle Termination, Recharge
Sequence
After the charge cycle is complete, the AAT3680
latches off the pass device and automatically enters
power-saving sleep mode. Either of two possible
conditions will bring the IC out of sleep mode: the
battery voltage at the BAT pin drops below V
RCH
(recharge threshold voltage) or the AAT3680 is reset
by cycling the input supply through the power-on
sequence. Falling below V
RCH signals the IC that it
is time to initiate a new charge cycle.
Figure 1: AAT3680 Operational Flow Chart.
UVLO
Temperature Test
TS > V
TS1
TS < V
TS2
Power On Reset
Power On Reset
Preconditioning Test
Current Phase Test
V
CH >VBAT
V
MIN >VBAT
V
TERM
R
SENSE
<V
RCH
Voltage
Phase Test
V
P > VUVLO
Shut Down
Mode
Shutdown
Mode
Yes
No
Yes
Yes
Low Current
Conditioning
Charge
Low Current
Conditioning
Charge
(Trickle Charge)
Temperature
Fault
Temperature
Fault
No
No
Current
Charging
Mode
Current
Charging
Mode
Yes
Voltage
Charging
Mode
< I
BAT
No
Yes
No
Charge Complete
Latch Off
Charge Complete
Latch Off
Voltage
Charging
Mode




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