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3.10 Battery Charger Interface
3.10 Battery Charger Interface
VUSB_LDO_4V9
VBUS_USB
C275
0.1u
50V internal voltage (10/31)
The RT9536 is a fully integrated single cell Li-ion battery charger IC ideal for portable applications.
The RT9536 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 28V.
When the input voltage exceeds the OVP threshold, it will turn off the charging MOSFET to avoid
overheating of the chip.
In RT9536, the maximum charging current can be programmed with an external resistor. For USB application,
the user can set the current to 100mA/500mA through the EN/SET pin. For the factory mode, the RT9536 can
allow 4.2V or 4.35V/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 RT9536 provides protection functions such as
under voltage protection, over voltage protection for VIN supply and thermal protection for battery
temperature.
The RT9536 is available in a WDFN-10L 3x2 package to achieve optimized solution for PCB space and
thermal considerations.
LGE Internal Use Only
LGE Internal Use Only
1
VIN
2
ISET
3
GND1
4
LDO
5
IEOC
C289
0.1u
Figure 3.10.1 BATTERY CHARGER BLOCK
Figure 3.10.1 BATTERY CHARGER BLOCK
45
3. TECHNICAL BRIEF
VBAT VIO_1V8
11
PGND
10
BATT
9
U204
PGB
8
CHGSB
7
GND2
6
EN_SET
Copyright © 2007 LG Electronics. Inc. All right reserved.
/ 131
Only for training and service purposes
- 44 -
Copyright © 2013 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
EOC
CHG_EN
Only for training and service purposes
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