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3.10 Battery Charger Interface
From External Source
From External Source
(Travel Adaptor or USB)
(Travel Adaptor or USB)
1V81_VDD
EOC
CHG_EN
Change to withstanding voltage from 6.3V to 25V
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.
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
OVP CHARGING IC
VCHG
VBUS_USB
U300
1
VDC
2
VUSB
3
_PPR
4
_CHG
5
_EN
6
IMIN
EUSY0351601
C308
C309
1u
1u
(1608)
(1608)
(080714)
Figure 3-10-1 BATTERY CHARGER BLOCK
ISL9221
13
PGND
12
VDC_BYP
11
BAT
10
USB_BYP
9
IVDC
8
GND
7
IUSB
(1%)
(1%)
Change to withstanding voltage from 6.3V to 10V
Copyright © 2007 LG Electronics. Inc. All right reserved.
- 51 -
Only for training and service purposes
3. TECHNICAL BRIEF
VBUS_OVP
VBAT
VCHG_OVP
C310
C311
C312
1u
1u
1u
(080714)
LGE Internal Use Only
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