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
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