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MP26056DQ-LF-Z

P1-P3P4-P6P7-P9P10-P11
MP26056- 28V, LI+SINGLE-CELL BATTERY CHARGER WITH USB/AC-ADAPTER INPUT
MP26056 Rev. 0.91 www.MonolithicPower.com 7
3/30/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
BLOCK DIAGRAM
BATTERY
CHARGE
CONTROL
7
9
4
1
10
3
2
5
6
MOD
IBF
ISET2
ISET1
SHDN
R
BF
8
R
SET1
R
SET2
IN
BATT
CHG
8.2V
8.2V
ACOK
GND
EN
V
IN
C
IN
C
OUT
V
BATT
+
_
OFF
ON
I
BATT
Figure 1—Functional 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
IN
<6.5V). 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 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
CHG
) based on R
setx
. 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 reduced to the preset
value based on R
IBF
, but the charger keeps
charging the battery until battery reach 4.2V
when AC adaptor is used as supply. If USB is
used as supply, please refer to the follow section
for auto recharge operation.
V
BAT
USB Input
I
BF
I
BAT
I
BF
4.2V
C.V Charging
AC Adapter Input
Figure 2—MP26056 Typical Charging Profile
MP26056- 28V, LI+SINGLE-CELL BATTERY CHARGER WITH USB/AC-ADAPTER INPUT
MP26056 Rev. 0.91 www.MonolithicPower.com 8
3/30/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
Charge Status Indicator (CHG)
The MP26056 has an integrated charge status
pin that remains low while the battery is charging.
Once the charge current has reduced to the
battery full charge current threshold (I
BF
), the
CHG pin will become high impedance.
Under full charge conditions, certain systems
may draw a very narrow current pulse that
exceeds the IBF threshold. The CHG indicator
may glitch. It is desirable to blank the CHG glitch
so that the system can properly indicate full
charge conditions to the end user.
A simple solution is to add a RC filter on the CHG
pin to filter out the possible CHG glitch, as show
in Figure 3.
SHDN
6
ISET2
9
IN
1
IBF
7
MOD
4
ACOK
3
CHG
2
GND
5
ISET1
8
BAT
10
MP26056
R1
VIN
SHDN
R2
CHG
ACOK
C4
C1
C2
NS
R4
R3
C6
VBAT
MOD
R5
R6
Figure 3—Filtered Charge Status with GPIO Connection
MP26056- 28V, LI+SINGLE-CELL BATTERY CHARGER WITH USB/AC-ADAPTER INPUT
MP26056 Rev. 0.91 www.MonolithicPower.com 9
3/30/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
Charge termination in USB mode
The charge current will gradually decrease in CV
mode as the battery approaches full. The battery
full threshold can be programmed by connecting
a resistor from IBF pin to ground. When the
charge current reaches this threshold, the
charger current will be turned off. The battery
voltage may decay after termination due to self
discharge or system draw current from the
battery.
Automatic Recharge in USB mode
Upon V
BATT
drops to 4.0V, the charger will
automatically restart the charge cycle until the
IBF condition is met again. When the input is
unplugged or the charger is disabled and/or
terminated, the leakage current from the battery
to MP26056 is less than 1uA.
Programming of Charge Current and Battery
Full Current
The charge current (I
CHG
) is set by resistors
(R
SETX
) connecting from the I
SETX
pin to GND. The
relationship of the charge current and the
programming resistance is established by
following equations.
CHG
SET1
1Ax1.7k
I
R
Ω
= (MOD= High, for USB)
CHG
SET1 SET2
1Ax1 . 7k
I
R//R
Ω
= (MOD=Low, for AC Adapter)
It is highly recommended to program the charge
current within 0.2A to 1A. The battery full charge
current threshold (I
BF
) is programmed by
connecting a resistor R
BF
from the IBF pin to
GND:
BF
BF
1A 1.7k
I
R
×Ω
=
The selection of R
BF
value should meet the
condition, 0.1I
CHG
< I
BF
< 0.6 I
CHG.
The open-drain
pin
CHG is used to indicate charging status.
When the battery full condition is reached or any
other condition prevents the charger from
charging,
CHG will become a floating.
Thermal Protection
The MP26056 has proprietary thermal protection
to prevent the IC from overheating. When in
thermal protection mode, the charge current
becomes a saw-tooth waveform instead of a DC
current. The average current of the saw-tooth
waveform will be lower than the programmed DC
charge current to prevent the IC from
overheating. Operating in thermal protection
mode will slow down the charging process.
Lowering the input voltage and enhancing
thermal dissipation to the environment can
effectively prevent the IC from going into thermal
protection mode.
P1-P3P4-P6P7-P9P10-P11

MP26056DQ-LF-Z

Mfr. #:
Buy MP26056DQ-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Battery Management 28V 1A Linear 1-Cell Li-Ion Chrg
Lifecycle:
New from this manufacturer.
Delivery:
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