Charging Circuit - LG GD310 Service Manual

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
VBUS_USB
RPWRON_EN
C323 C308
1U 1U
ECZH0003503
(25V,K,X5R, 1608)
LGE Internal Use Only
U300
1
IN
2
ISET
3
VSS1
4
LDO
5
IFULL
BQ25040
R319
R318
1.2k 2K
Figure 20. Charging circuit
.
2V62_VIO VBAT
R310
100K
11
PGND
10
BAT
9
_PG
8
CHG
7
VSS2
6
EN_SET
C325
1U
ECZH0001215
(10V,K,X5R, 1005)
- 48 - Copyright © 2009 LG Electronics. Inc. All right reserved.
2V62_VIO 2V62_VIO
R314
R317
DNI 100K
_PPR
_EOC
_CHG_EN
Only for training and service purposes