MP2604 – SINGLE CELL 1A LINEAR LI-ION BATTERY CHARGER W/O TRICKLE CHARGE
MP2604 Rev. 1.2 www.MonolithicPower.com 6
1/25/2010 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2010 MPS. All Rights Reserved.
BLOCK DIAGRAM
BATTERY
CHARGE
CONTROL
7
9
8
5
1
10
2
3
64
SS
ISET
IBF
NTC
R
NTC
C
SS
R
CHG
R
BF
R1
IN
BATT
CHG
ACOK
GNDEN
V
IN
C
IN
C
OUT
V
BATT
+
_
OFF ON
I
BATT
Figure 1—Functional Block Diagram
OPERATION
Input Voltage Range
The MP2604 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 2.5V or higher than 7.0V.
The open-drain pin
ACOK is used to indicate
an input power good condition (i.e.
2.5V<V
IN
<7.0V). If the input voltage is lower
than the battery voltage, the IC is also disabled
to prevent the battery from draining.
Charge Cycle (Mode Change: CC-> CV)
Figure 2 below shows the typical charging
profile for the MP2604. Figure 3 shows the
typical charging procedure. For a depleted
battery the MP2604 will start with the constant
current of the programmed value (I
CHG
). This is
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 in the CV mode is reduced to the
programmed full battery current (I
BF
).
The MP2604 can start up with heavy load and
is stable without a battery connected to the
BATT pin.
