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3. TECHNICAL BRIEF
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3.10.3.2. 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.
Figure. PM7540 Charging Flow (CC Charging)
3.10.3.3. 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.
3.10.3.4. GT540 Charging Specification
• 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
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