Charging Circuit - LG GM360i Service Manual

3. TECHNICAL BRIEF

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
RPWRON_EN
LG Electronics
LGE Internal Use Only
Single Charging IC for uUSB
Pattern width over 2mm.
V_BUS
1
IN
2
ISET
3
VSS1
4
LDO
5
IFULL
C209 C239
1uF
1uF
Tol. 1%
(650mA) (150mA)
Figure 17 Charging circuit
49/147
VIO_2V62 VIO_2V62
VIO_2V62 VBAT
11
PGND
10
R227
BAT
U201
9
_PG
0
8
CHG
7
R18
VSS2
6
EN_SET
0
C218
1uF
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