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3.10 Battery Charger Interface
CHARGING IC
LDO_OUT
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.
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
From External Source
From External Source
(Travel Adaptor or USB)
VBUS_USB
(Travel Adaptor or USB)
R208
R211
C216
C215
0.1u
1u
1300
5.1K
Figure 3-10-1 BATTERY CHARGER BLOCK
11
PGND
1
10
VIN
BATT
2
9
U202
ISET
PGB
3
8
GND1
CHGSB
4
7
LDO
GND2
5
6
IEOC
EN_SET
50/136
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3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
VBAT
1V8_VDD
R223
100K
_EOC
CHG_EN
R285
C212
C247
0.1u
1u
DNI
LGE Internal Use Only
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