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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
LG Electronics
44/115
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
3.3K
R301
EUSY0388501
U301
BQ25040
5
6
7
4
8
3
9
2
10
1
11
PGND
IN
BAT
ISET
_PG
VSS1
CHG
LDO
VSS2
EN_SET
IFULL
1u
C303
C304
1u
100K
R305 R306
100K DNI
R307
0.1u
C312
820
R326
VBAT
_PPR
_CHG_EN
VCHG_OUT
VBUS_VCHG
2V62_VIO
_CHG_EOC
(645mA) (100mA)
Single Charging IC for uUSB
(1%)
(1%)
(1608,25V,K,X5R)
(1608,25V,K,X5R)
Содержание GT350
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