MP26506 MPS, MP26506 Datasheet - Page 5

• Manufacturer Part Number: MP26506
• Description: 28v, Li+single-cell Battery Charger With Usb/ac-adapter Input & Reverse Polarity Protection
• Manufacturer: MPS

BLOCK DIAGRAM
OPERATION
Input Voltage Range
The MP26056 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 3.0 or higher than 7.0V. The open-
drain pin ACOK is used to indicate an input
power good condition (i.e. 3.5V<V
input voltage is lower than the battery voltage,
the IC is also disabled to prevent the battery from
draining.
Charge Cycle (Mode Change: CC to CV)
Figure 2 below shows the typical charging profile
for the MP26056. The MP26056 will start with the
Constant Current charge of the programmed
value (I
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 reduced to the preset
value based on R
charging the battery until battery reach 4.2V
when AC adaptor is used as supply. If USB is
MP26056 Rev. 0.9
7/31/2008
CHG
) based on R
MP26056- 28V, Li+Single-Cell Battery Charger with USB/AC-Adapter Input & Reverse Polarity Protection
R
SET2
IBF
R
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
SET1
R
, but the charger keeps
BF
setx
. This is referred to as
ISET2
ISET1
IBF
MOD
ON
SHDN
OFF
Figure 1—Functional Block Diagram
4
9
7
8
IN
<6.5V). If the
EN
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CONTROL
BATTERY
CHARGE
6
www.MonolithicPower.com
5
GND
IN
used as supply, please refer to the follow section
for auto recharge operation.
Figure 2—MP26056 Typical Charging Profile
8.2V
1
8.2V
10
3
2
BATT
CHG
ACOK
C
I
IN
BATT
I
BF
I
V
BAT
IN
AC Adapter
USB
+
V
_
BATT
C
OUT
V
BAT
5