LG GD910 - Calls; Making, Receiving, and Managing Calls

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Only for training and service purposes
3. BB Circuit Technical brief
GD910 service manual
3.3.2 Charging control
- GD910 uses external charging IC which is ISL9221
1. Charging method : CC-CV
2. Charger output voltage : 5.1 V
3. Charging time : 2h 30m
4. Charging current : 379 mA
5. CV voltage : 4.2 V
6. Cutoff current : 65mA
7. Full charge indication current (icon stop current) : 65mA
8. Recharge voltage : 4.15 V
9. Low battery alarm
a. Idle : 3.54 V ~ 3.34 V
b. Dedicated : 3.54 V ~ 3.34 V
10. Low battery alarm interval
a. Idle : 3 min
b. Dedicated : 1 min
11. Switch-off voltage : 3.34 V
12. Charging temperature adc range
a. ~ -20 : low charging voltage operation (3.6 V ~ 3.9 V) .
b. -20 ~ 60 : standard charging (up to 4.2 V) 
c
. 60 ~ : low charging voltage operation (3.6V ~ 3.9V) 
GD910 service manual
[Figure 3.3.2-1] Charging IC (ISL9221)
EOC Current : 67mA
Charging Current : 379mA
Charger IC
VCHG
R301 100K
2.2u
2V62_VIO
USB_VBUS
C304
47K
R302
47K
R303
2
D300
KDR331V
3
1
BATTERY
C301
1u
1u
11
8
GND
6
IMIN
7
IUSB
9
IVDC
PGND
13
USB_BYP
10
1
VDC
12
VDC_BYP
VUSB
2
4
_CHG
5
_EN
_PPR
3
C303
ISL9221
U300
BAT
C302
R304
18K
1u
C305
2.2u
VDD_CHARGE
18K
R305
100KR300
R306
8.2K
_CHG_EN
TA_DETECT
_PPR
_CHG_EOC