- 48 -
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. Technical Brief
3.14. Charging circuit
BQ25040 accepts two power inputs, normally one from a USB (Universal Serial Bus) port and the other
from a desktop cradle.
The BQ25040 features 30V maximum voltages for the cradle. Due to the 30V rating for the cradle input,
low-cost, large output tolerance adapters can be used safely
.
Figure 20. Charging circuit
C308
1U
2V62_VIO
R310
100K
2V62_VIO
2V62_VIO
R314
100K
C323
1U
VBUS_USB
U300
BQ25040
5
6
7
4
8
3
9
2
10
1
11
PGND
IN
BAT
ISET
_PG
VSS1
CHG
LDO
VSS2
EN_SET
IFULL
DNI
R317
1U
C325
VBAT
R318
1.2k
R319
2K
_PPR
_CHG_EN
_EOC
RPWRON_EN
(10V,K,X5R, 1005)
ECZH0001215
(25V,K,X5R, 1608)
ECZH0003503