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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
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