ACT5830 datasheet(40/41 Pages) ACTIVE-SEMI

40 / 41 page

SINGLE-CELL Li+ BATTERY CHARGER (CHGR)

ACT5830

Rev 2, 20-Jan-11

Innovative Power

- 40 -

www.active-semi.com

ActivePMU

TM is a trademark of Active-Semi.

2CTM is a trademark of NXP.

FUNCTIONAL DESCRIPTIONS CONT’D

state and charging can resume as defined by

Figure 4.

NO BAT 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

CHGR/VSET[

simulating

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

either:

1) Pull nENCHG high, or Setting SUSCHG = [1].

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.

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.

Figure 4:

Charger State Diagram

PRECONDITION

FAST-CHARGE

TOP-OFF

DELAY

ANY STATE

VCHG_IN < VBAT OR

VCHG_IN < UVLO OR

CHGR/SUSCHG[ ] = [1]

VBAT > 2.9V

VBAT = VSET[ ]

VBAT < VSET[ ] – 200mV

IBAT < ISET[ ]/10

or T > TIMOSET[ ]

TIMEOUT-FAULT

T > TIMOSET[ ] AND

VBAT < 2.9V

SLEEP

T > TIMOSET[ ]

T > 32ms

BATTERY PRESENT AND

VCHG_IN > VBAT AND

VCHG_IN > UVLO AND

CHGR/SUSCHG[ ] = [0]

LDO-MODE

SUSPEND

TID <

2.0

VBATID > 2.5V AND

VCHG_IN > UVLO AND

CHGR/SUSCHG[ ] = [0]

ANY STATE

IBAT > ISET[ ]/10

Charge Timers

Cleared

Charge Timers

not Cleared or

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