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3.11 Battery Charger Interface
From External Source
From External Source
(Wall Adaptor or Computer)
(Wall Adaptor or Computer)
2V93_VEXT
VUSBIN
VCHARGE
CHG_PPR
CHG_IND
CHG_EN
C220
1u
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 ISL9221 adds an additional feature in providing a limited amount of current to system architecture
while protecting the system from destructively high voltage.
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
External Charger
U202
ISL9221
13
PGND
1
VDC
12
VDC_BYP
2
VUSB
11
BAT
3
_PPR
10
USB_BYP
4
_CHG
9
IVDC
5
_EN
8
GND
6
IMIN
7
IUSB
C221
1u
Figure 3-11-1 BATTERY CHARGER BLOCK
VBAT
CHG_ABB
C222
1u
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 43 -
3. TECHNICAL BRIEF
VBUS_USB
R216
10K
R217
15K
C223
C224
1u
1u
LGE Internal Use Only
USB_DET
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