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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. Technical Brief
Constant Current Charging
The PM7540 IC supports constant current charging of the main battery by controlling the charger pass
transistor and the battery transistor. The constant current charging continues until the battery reaches its
target voltage, 4.2V.
Constant Voltage Charging
Constant voltage charging begins when the battery voltage reaches a target voltage, 4.2V.
The end of constant voltage charging is commonly detected 10% of the full charging
current.
• Charging Method : CC & CV (Constant Current & Constant Voltage)
• Maximum Charging Voltage : 4.2V
• Maximum Charging Current : 700mA
• Nominal Battery Capacity : 1500mAh
• Charging time : Max. 3h 30m
• Full charge indication current (icon stop current) : 50mA
• Cut-off voltage : 3.20V
@ Battery icon display
Battery Bar Specification
BAR 6 (Full) 90% over
Remain %
BAR 6 --> 5 90% Æ 89%
BAR 5 --> 4 70% Æ 69%
BAR 4 --> 3 50% Æ 49%
BAR 3 --> 2 30% Æ 29%
BAR 2 --> 1 15% Æ 14%
BAR 1 --> 0 5% Æ 4%
Low Battery Pop-up
4% ~ 15% : One Time popup (No
call)
Critical Low Battery Pop-up
0% ~ 3% : Level chage popup
(No call)
POWER OFF 0%
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