®
ACT5830
Rev 2, 20-Jan-11
SINGLE-CELL Li+ BATTERY CHARGER (CHGR)
FUNCTIONAL DESCRIPTIONS CONT’D
state and charging can resume as defined by
Figure 4.
either:
1) Pull nENCHG high, or Setting SUSCHG = [1].
NO BAT State
If the battery is reconnected while operating in the
NO BAT state, the state machine resets the charge
timers and jumps to the PRECONDITION state.
The ACT5830 charger has been designed so that it
will provide system power when there is no battery
present. If the battery is not present at any time
while a valid input voltage (>4V) is applied to
CHG_IN, the ACT5830 will enable the charger and
regulate the output at the voltage programmed by
Reverse Battery
The ACT5830 includes internal circuitry that
eliminates the need for series blocking diodes,
reducing solution size and cost as well as dropout
voltage relative to conventional battery chargers.
When the input supply is removed, when VIN goes
below the ACT5830's under voltage-lockout (UVLO)
voltage, or when VIN drops below VBAT, the
ACT5830 automatically goes into SUSPEND mode
and reconfigures its power switch to minimize
current drain from the battery.
CHGR/VSET[ ], simulating
a
battery-present
condition. The output current of the charger in this
state is default to 1000mA to ensure full operation
of the phone. When operating in this state, the
charge timers are disabled but the thermal
regulation loop is active. It is important for the
application designer to consider both the power
available from the charger as well as the thermal
design in order to ensure proper system operation
in this state. The user can prevent this operation by
Figure 4:
Charger State Diagram
ANY STATE
ANY STATE
VBATID > 2.5V AND
VCHG_IN < VBAT OR
VCHG_IN > UVLO AND
CHGR/SUSCHG[ ] = [0]
VCHG_IN < UVLO OR
CHGR/SUSCHG[ ] = [1]
LDO-MODE
SUSPEND
BATTERY PRESENT AND
VCHG_IN > VBAT AND
VCHG_IN > UVLO AND
CHGR/SUSCHG[ ] = [0]
T > TIMOSET[ ] AND
VBAT < 2.9V
TIMEOUT-FAULT
PRECONDITION
VBAT > 2.9V
Charge Timers
Cleared
FAST-CHARGE
VBAT = VSET[ ]
T > TIMOSET[ ]
TOP-OFF
Charge Timers
not Cleared or
IBAT > ISET[ ]/10
IBAT < ISET[ ]/10
or T > TIMOSET[ ]
DELAY
T > 32ms
SLEEP
VBAT < VSET[ ] – 200mV
Innovative PowerTM
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