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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)
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
[Figure 3.3.2-1] Charging IC (ISL9221)
1%
1%
1%
CHARGING IC
378mA
600mA
117mA
C243
1u
2V11_RTC
2V62_VIO
1u
C245
1u
C244
R227
100K
12
2
VUSB
_CHG
4
_EN
5
3
_PPR
ISL9221
BAT
11
8
GND
6
IMIN
IUSB
7
IVDC
9
13
PGND
10
USB_BYP
VDC
1
VDC_BYP
U203
18K
R230
VBAT
R229
11.3K
1u
C242
R226
100K
4.7K
VCHG
R228
C246
1u
USB_VCHG
_PPR
OVP_VUSB
OVP_VCHG
CHG_EN
_EOC
Содержание KP275
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