Only For Training And Service Purposes - LG KP270 Service Manual

3. TECHNICAL BRIEF
3.3.2 Charging control
• KP270 is use external charging IC
• Charging IC is ISL9221
1. Charging method : CC-CV
2. Charger output voltage : 5.1 V
3. Charging time : 2h 10m
4. Charging current : 600 mA
5. CV voltage : 4.2 V
6. Cutoff current : 117 mA
7. Full charge indication current (icon stop current) : 117 mA
8. Recharge voltage : 4.15 V
9. Low battery alarm
a. Idle : 3.45 V ~ 3.31 V
b. Dedicated : 3.45 V ~ 3.3 V
10. Low battery alarm interval
a. Idle : 3 min
b. Dedicated : 1 min
11. Switch-off voltage : 3.31 V
12. Charging temperature adc range
a. ~ -20°C : low charging voltage operation (3.6 V ~ 3.9 V) .
b. -20°C ~ 60°C : standard charging (up to 4.2 V)
c. 60°C~ : low charging voltage operation (3.6V ~ 3.9V)
CHARGING IC
_EOC
CHG_EN
LGE Internal Use Only
USB_VCHG
VCHG
2V62_VIO
2V11_RTC
U203
1
R226
VDC
R227
100K
2
100K
VUSB
3
_PPR _PPR
4
_CHG
5
_EN
6
IMIN
117mA
C242
C243 R228
1u 1u
4.7K
1%
[Figure 3.3.2-1] Charging IC (ISL9221)
- 32 -
ISL9221
13
PGND
12
VDC_BYP
11
BAT
10
USB_BYP
9
IVDC
8
GND
7
IUSB
378mA 600mA
R230
R229 C244 C245
18K 1u 1u
11.3K
1%
1%
Copyright © 2008 LG Electronics. Inc. All right reserved.

Only for training and service purposes

VBAT
OVP_VCHG
OVP_VUSB
C246
1u