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3. TECHNICAL BRIEF
3.11 Battery Charger Interface
V_BUS
VBUS_REG
R209
C222
0.1u
820
820 ohm,1/16W ,F ,1005 ,R/TP
The RT9524 is a fully integrated single-cell Li-Ion battery charger IC ideal for portable applications. The
RT9524 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/2.3A 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.
LGE Internal Use Only
From External Source
From External Source
(Wall Adaptor or Computer)
(Wall Adaptor or Computer)
PGND
1
VIN
BATT
2
U201
ISET
PGB
3
RT9524
GND1
CHGSB
4
LDO
GND2
5
IEOC
EN_SET
EUSY0410801
R208
3K
3000ohm,1/16W,F,1005,R/TP
Figure 3.11.1 BATTERY CHARGER BLOCK
47/140
- 46 -
3. TECHNICAL BRIEF
VBAT
VIO
R211
11
100K
10
9
8
7
6
C211
DNI
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
PGB
CHG_EN
R239
10K
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