MP2605 MPS, MP2605 Datasheet - Page 9

• Manufacturer Part Number: MP2605
• Description: 1A Li-Ion/Li-Polymer Battery Charger
• Manufacturer: MPS

OPERATION
Input Voltage Range
The MP2605 has built-in input voltage surge
protection as high as +28V. The charger IC will
be automatically disabled when the input
voltage is lower than 3.0V or higher than 7.0V.
The open-drain pin
an
3.0V<V
than the battery voltage, the IC is also disabled
to prevent the battery from draining.
Charge Cycle (Mode Change: Trickle -> CC->
CV)
Figure 2 shows the typical charging profile for
the MP2605. For a fully depleted battery with a
terminal voltage lower than 2.6V, the MP2605
will start with the trickle charge (preconditioning)
at 10% of the full charge current based on the
value of R
mode longer than 32768 cycles, the battery
fault condition will be indicated by flashing the
2.6V, the charger begins charging using the
programmed charge current (I
referred to as Constant Current (CC) mode.
Once the battery voltage reaches 4.2V, the
charger will operate in the constant voltage (CV)
mode until the battery is fully charged. The
charge current drops during CV mode, and the
battery full indication is set when the charge
current is reduced to 20% of the programmed
constant current value (I
process is then terminated. Recharge will start
after the battery voltage is reduced to 4.0V.
After 262144 cycles of continuous charging, if
the battery still has not reached 20% of the I
condition, the on-chip timer will terminate the
charger to prevent charging the dead battery
excessively and the fault condition will be
flagged by flashing the
Charge Termination
The charge current will gradually decrease in
CV mode as the battery approaches full. The
MP2605 Rev. 0.94
1/25/2010
CHG
input
LED. After the battery voltage reaches
IN
<7.0V). If the input voltage is lower
CHG
power
. If the charger stays in trickle
MP2605 – 28V, 1A LINEAR BATTERY CHARGER WITH TRICKLE CHARGE AND TIMER
ACOK
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
good
CHG
is used to indicate
CHG
LED.
). The charge
condition
CHG
).This is
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(i.e.
CHG
battery full threshold is internally programmed
to be 20% of the I
reaches this threshold, the charger IC will be
automatically turned off.
Automatic Recharge
When V
automatically restart the charge cycle until the
20% I
adapter is unplugged, or the charger is disabled
and/or terminated, the leakage current from the
battery to the MP2605 is less than 1uA.
Programming of Charge Current and Battery
Full Current
The charge current (I
(R
and the programming resistance is established
by the following table and graph.
Table 1—R
R
The relationship between the charge current
Figure 2—MP2605 Typical Charging Profile
CHG
CHG
k (
) connected from the ISET pin to GND,
CHG
20% of I
10% of I
Ω
)
BATT
=
condition is met again. When the input
1700
I
R
CHG
CHG
CHG
CHG
CHG
1.65
1.82
2.05
2.32
2.74
4.12
8.45
drops to 4.0V, the charger will
I
3.3
5.6
BATT
15
and I
I /
(kΩ)
CHG
Charging
CHG
Trickle
(
CHG
mA
. When the charge current
CHG
2.6V
Relationship
)
.
) is set by a resistor
Charging
I
CHG
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CC
1000
900
800
700
600
500
400
300
200
100
(mA)
4.2V
CV
Charging
Charging
Complete
V
BATT
9