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LGE Internal Use Only
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL BRIEF
GS290 Operational Description Revision B
LG Electronics
47/136
LGE Property
3.13. charging circuit
The bq25040 is a highly integrated Li-ion linear battery charger targeted at space-limited portable applications.
It operates
from either a USB port or AC adapter and charges a single cell Li-Ion battery with up to 1.2A of charge current.
The high input
voltage range with input over-voltage protection supports low-cost unregulated adapters.
MAIN FEATURES
• 30V input rating, with Over-Voltage Protection
(OVP)
• Input Voltage Dynamic Power Management
Feature
• 50mA integrated low dropout linear regulator
(LDO)
• 1% Battery Regulation Accuracy
• 10% Charge Current Accuracy
• Pin selectable USB 100mA and 500mA
maximum input current limit
• 4.2V @ 2.3A Test Jig mode
• Thermal Regulation Protection for Output Current
Control
• Low Battery Leakage Current, BAT Short-Circuit
Protection
Figure 17 Charging circuit
K3.
3
60
2
R
BQ25040
U201
5
6
7
4
8
3
9
2
10
1
11
PGND
IN
BAT
ISET
_PG
VSS1
CHG
LDO
VSS2
EN_SET
IFULL
1u
C210
1u
C212
VIO_2V62
VIO_2V62
50
2
R
I
N
D
C224
1u
VBAT
VIO_2V62
V_BUS
K0
01
32
2
R
02
8
70
2
R
K0
01
42
2
R
_CHG_EOC
_PPR
_CHG_EN
RPWRON_EN
Single Charging IC for uUSB
)
%
1
(
(645mA)
)
%
1
(
(105mA)
