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LGE Internal Use Only Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
ͽͶ͑ͺΟΥΖΣΟΒΝ͑ΆΤΖ͑ΟΝΪ
[`VXZZ
3.10 Battery Charger Interface
Figure 3-10-1 BATTERY CHARGER BLOCK
The RT9524 is a fully integrated single-cell Li-Ion battery charger IC ideal for portable applications. The RT
9524 optimizes the charging task by using a control algorithm including pre-charge mode, fast charge
mode and constant voltage mode. The input voltage range of the VIN pin can be as high as 30V. When
the input voltage exceeds the OVP threshold, it will turn off the charging MOSFET to avoid overheating of
the chip.
In RT9524, the maximum charging current can be programmed with an external resister. For the USB
application, user can set the current to 100mA/500mA through EN/SET pin. For the factory mode, the
RT9524 can allow 4.2V/2.3V power pass through to support system operation. It also provides a 50mA
LDO to support the power of peripheral circuit. The internal thermal feedback circuit regulates the die
temperature to optimize the charge rate for all ambient temperatures. The RT9524 provides protection
functions such as under voltage protection, over voltage protection for VIN supply and thermal
protection for battery temperature.
The RT9524 is available in a WDFN-10L 2x3 package to achieve optimized solution for PCB space and
thermal considerations.
3. TECHNICAL BRIEF
From External Source
(Travel Adaptor or USB)
0.1u
C257
1V8_VDD
C221
1u
0.1u
C222
VBUS_USB
1u
C223
RT9524
EUSY0410801
U203
65
74
83
92
101
11
PGND
VIN BATT
ISET PGB
GND1 CHGSB
LDO GND2
IEOC EN_SET
VBAT
100K
R217
820
R233
3.9K
R234
CHG_EN
LDO_OUT
_EOC
(25V)
(10V)
CHARGING IC
From External Source
(Travel Adaptor or USB)