3. TECHNICAL BRIEF
3.10.3.2 Constant Current Charging
Battery Pre-Charge Current
During a charge cycle, if the battery voltage is below the pre-charge threshold, the RT9524 enters the Pre-charge
mode. This feature revives deeply discharged cells and protects battery. Under USB100 Mode, the pre-charge
current is internally set to 95mA. When the RT9524 is under USB500 and ISET Mode, the pre-charge current is
20% of fast-charge current set by external resistor R
ISET.
Battery Fast-Charge Current
ISET Mode
The RT9524 offers ISET pin to program the charge current. The resistor R
ISET is connected to ISET and GND. The
parameter K
ISET is specified in the specification table.
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