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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.10 Battery Charger Interface
Figure 3-10-1 BATTERY CHARGER BLOCK
The ISL9221 Lithium Ion charging IC is designed to meet the charging requirements of most of today’s
handheld devices.
The IC provides two inputs for either USB connection where the current is limited by the USB standard or for
powering/charging from a power adapter.
If the voltage at either VUSB or VDC pin is within the safe allowable range, the PPR pin is pulled low indicating
to the system processor that external power is available.
Charging can be enabled/disabled by controlling the state of the EN pin. While charging, the CHG pin is
pulled low indicating the battery is being charged.
The battery is charged to 4.2V with only a 1% error across the temperature range. USB charge current,
Adapter charge current and charge termination currents can be programmed via external resistors.
The device contains Thermal regulation and protection to provide additional safety features of this device.
When the temperature exceeds +125°C, the current will fold back to reduce and control the die temperature.
From External Source
(Travel Adaptor or USB)
(1608)
(080714)
(1%)
(1%)
Change to withstanding voltage from 6.3V to 25V
Change to withstanding voltage from 6.3V to 10V
(1608)
(080714)
OVP CHARGING IC
200K
R319
1V81_VDD
ISL9221
EUSY0351601
U300
11
BAT
GND
8
IMIN
6
7
IUSB
9
IVDC
PGND
13
USB_BYP
10
1
VDC
12
VDC_BYP
VUSB
2
4
_CHG
5
_EN
_PPR
3
C308
1u
C311
1u
20K
R308
VBAT
C309
1u
VBUS_OVP
100K
R307
C312
1u
VCHG_OVP
VBUS_USB
100K
R320
R303
6.8K
1u
C310
R304
16K
VCHG
EOC
CHG_EN
From External Source
(Travel Adaptor or USB)
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