ACT5880 datasheet(80/87 Pages) ACTIVE-SEMI

80 / 87 page

ACT5880

Rev 2, 03-Sep-13

- 80 -

www.active-semi.com

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rise far beyond a thermal threshold of nominal

100°C. The current reduction is about 50mA/°C for

die temperature over the threshold. This feature

prevents the ACT5880 from excessive junction

temperature and makes it more accommodating of

aggressive thermal designs without risk of damage.

When the thermal regulation reduces the current, it

takes longer time to charge the battery. The thermal

regulation is counted in end of charge detection,

which assures that the battery could be charged to

the same status as a normal charged battery when

the end of charge detected.

Figure 17:

The Charging Profile of the ACT5880 Charger.

Charger State-Machine

The I and V parameter changes, input condition and

the time-out outputs of 2 timers trigger the state

transitions.

State Transition Table

The LDO mode is a lonely state when the BATID

detection is configured and the BATID reads invalid.

The other states are subset available when the

BATID reads valid or the BATID detection is not

configured. Refer to Table 11 for transition details.

Pre-condition State

When the VVBAT is less than the precondition

threshold voltage, the cell is charged at a reduced

current of either 45mA or 10% of the fast charge

current, whichever is the greater.

Fast-Charge State

When VVBAT is greater than the precondition

threshold and before it reaches to the battery

regulation voltage, or over 200mV falls down from

the battery regulation voltage, the charger operates

in fast-charge state, when the cell is charged with

the fast charge current, or a less current restricted

by the thermal regulation and power source

capability. Once the VVBAT reaches the battery

regulation voltage; the state machine jumps into

Top-Off State.

Table 11:

The State Transition Summary.

Note: The PTV stands for pre-condition threshold voltage, the

BRV stands for battery regulation voltage, the ICHG stands for

charge path current and the IEOC stands for end of charge

current.

Top-Off State

In the Top-Off state, the cell is charged in constant

voltage mode where the VVBAT is regulated at

battery regulation voltage, which equals to the

charge termination voltage specified in battery

specification. The charge current goes less and less

from the fast charge current as the charging is on

and on, against the chemical and physical

composition changes in the cell. Once the charge

current goes less than the end of charge current

threshold, the state machine jumps into Sleep State

while the cell is recognized as full charged, the

state is also the state of Sleep.

Precondition

Fast charge

Top-off

Suspend

(or floating)

Endof charge

threshold

(current)

Precondition

threshold

(voltage )

VBAT regulation

(voltage)

Top-off start

(voltage)

Precondition regulation

(current)

Fast charge

regulation (current)

ICHARGE

VVBAT

Current=0

Expended scale

CURRENT

STATE

NEXT STATE

CONDITIONS

Any state

Sleep

VCHGIN<VVBAT,

SUSCHG=1 or

(total charge timer

time-out)

Any state

Temp-Fault

Battery Temp Out

of Range

Temp-Fault

Sleep

Battery Temp is OK

Pre-condition

Time-Fault

Pre-condition timer

times-out.

Time-Fault

Sleep

Presumably battery

replaced.

Sleep

Fast-Charge

SUSCHG=0, VCHGIN

valid and VVBAT<

(BRV-200mV)

Pre-condition

Fast-Charge

VVBAT>PTV, not

Temp-Fault.

Fast-Charge

Top-Off

VVBAT=BRV and not

(Total Charge Time-

Out )

Top-Off

Sleep

ICHG=IEOC and

not (Charge Time-

Out )

Sleep

Pre-condition

VVBAT<PTV

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