LG -P990 Service Manual page 50

3.10.3.2 Constant Current Charging
Battery Pre-Charge Current
3.3.10.2 Constant Current Charging
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
Battery Pre-Charge Current
current is internally set to 95mA. When the RT9524 is under USB500 and ISET Mode, the pre-charge current is
During a charge cycle, if the battery voltage is below the pre-charge threshold, the PT954 enters the pre-charge
mode. This feature revives deeply discharged cells and protects battery. Under USB 100 Mode, the pre-chaege
20% of fast-charge current set by external resistor R
current is internally set to 95mA. When the RT954 is under USB500 and ISET Mode, the pre-charge current is 0%
of fast-charge current set by external resistor R
Battery Fast-Charge Current
ISET Mode
Battery Fast-Charge Current
ISET Mode
The RT9524 offers ISET pin to program the charge current. The resistor R
The RT954 offers ISET pin to program the charge cyrrent. The resistor R
parameter K is specified in the specification table.
ISET
The parameter K is specified in the specification table.
iset
530
I charge =
R
iset
LGE Internal Use Only
.
ISET
.
iset
ISET
iset
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3. TECHNICAL BRIEF
is connected to ISET and GND. The
is connected to ISET and GND.
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