LG GD910 Service Manual page 33

3. BB Circuit Technical brief
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
℃ ℃
b. -20 ~ 60 : standard charging (up to 4.2 V)
. ℃
c 60 ~ : low charging voltage operation (3.6V ~ 3.9V)
Charger IC
_PPR
_CHG_EOC
_CHG_EN
LGE Internal Use Only
operation (3.6 V ~ 3.9 V) .
USB_VBUS
2V62_VIO
VCHG U300
1
VDC
VDC_BYP
2
VUSB
3
_PPR
USB_BYP
4
_CHG
5
_EN
6
C304 C305
IMIN
2.2u 2.2u
ISL9221
R306
8.2K
[Figure 3.3.2-1] Charging IC (ISL9221)
GD910 service manual
BATTERY
13
PGND
12
11
BAT
10
9
IVDC
C301 C302 C303
8
1u 1u 1u
GND
7
IUSB
R305 R304
18K 18K
- 34 - Copyright © 2009 LG Electronics. Inc. All right reserved.
GD910 service manual
VDD_CHARGE
D300
1
3
2
KDR331V
R302
47K
TA_DETECT
R303
47K
Charging Current : 379mA
EOC Current : 67mA
Only for training and service purposes