- 7 -
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. BB Circuit Technical brief
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2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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3.3.2 Charging control
- KM555 uses external charging IC which is BQ25040.
1. Charging method : CC-CV
2. Charger output voltage : 5.1 V
3. Charging time : 2h 20m
4. Charging current : 620 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 : 3.52 V ~ 3.33 V
b. Dedicated : 3.52 V ~ 3.3 V
10. Low battery alarm interval
a. Idle : 10 min
b. Dedicated : 10 min
11. Switch-off voltage : 3.35 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)
[Figure 3.3.2-1] Charging IC (ISL9221)
100K
R304
C302
0.1u
2V62_VIO
VBUS_USB
1.5K
R311
U300
5
6
7
4
8
3
9
2
10
1
11
PGND
IN
BAT
ISET
_PG
VSS1
CHG
LDO
VSS2
EN_SET
IFULL
2V62_VIO
2V62_VIO
1u
C316
C317
1u
VBAT
R320
100K
DNI
R321
820
R322
RPWRON_EN
_PPR
CHG_EN
_CHG_EOC
(25V,K,X5R, 1608)
CHARGING IC
(10V,K,X5R, 1005)
ECZH0001215
Содержание KM555
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