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MP26023 Datasheet(PDF) 8 Page - Monolithic Power Systems

No. de pieza MP26023
Descripción Electrónicos  28V, 1A Linear Li-Ion Battery Charger with Trickle Charge
PDF  11 Pages
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Fabricante Electrónico  MPS [Monolithic Power Systems]
Página de inicio  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP26023 Datasheet(HTML) 8 Page - Monolithic Power Systems

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MP26023 – 28V, 1A LINEAR LI-ION BATTERY CHARGER WITH TRICKLE CHARGE
MP26023 Rev.0.9
www.MonolithicPower.com
8
12/14/2009
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
3.0V
4.2V
VBATT
10% of ICHG
IBF
Trickle
Charging
CC
Charging
Charging
Complete
CV
Charging
ICHG
IBATT
Figure 2—MP26023 Typical Charging Profile
Trickle
Charging
Charge
Start
Charge
End
Soft-Start
Time
CC
Mode
CV
Mode
10% of ICHG (IBF)
90% of ICHG
ICHG
3.0V
4.2V
VBATT
VBATT
IBATT
IBATT
CHG
Figure 3—MP26023 Typical Charging
Procedure
Battery Over-Voltage Protection and
Automatic Recharge
At any time when VBATT is 50mV higher than the
trimmed charge target, the MP26023 reduces
its charge current to 0µA. This ensures the
safety of the battery. Also, the CV control loop
always monitors the battery voltage such that it
will automatically recharge the battery when it is
depleted below the target level.
Programming of Charge Current and Battery
Full Current
The charge current (ICHG) is set by a resistor
(RCHG) connecting from the ISET pin to GND.
The relationship of the charge current and the
programming resistance is established by the
following table and graph.
Table 1—RCHG and ICHG Relationship
RCHG (kΩ)
ICHG (mA)
1.65
1000
1.82
900
2.05
800
2.32
700
2.74
600
3.3
500
4.12
400
5.6
300
8.45
200
15
100
Charge Current vs.
1/RCHG Resistance
1000
900
800
700
600
500
400
300
200
0
0.2
0.1
0.3 0.4
0.6 0.7
0.5
Figure 4—Charge Current vs. 1/RCHG
Resistance
The recommended resistance for programming
the charge current is 2.3kΩ<RCHG<11kΩ. The
battery full charge current threshold (IBF) is
programmed by connecting a resistor RBF from
the IBF pin to GND:
B F
B F
1 A
1 . 7 k
I
R×Ω
=
Where 2RCHG<RBF<10RCHG. 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 pin.



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