ACT2813 datasheet(10/23 Pages) ACTIVE-SEMI

10 / 23 page

Rev 2, 19-May-15

Innovative PowerTM

- 10 -

www.active-semi.com

ACT2813/ACT2813C

Figure 2:

ACT2813C System Operation Flow Chart

Latch-Off

ACT2813/ACT2813C has latch off function. If

discharging stops due to battery cut-off, and latch

off will be triggered, it would prevent battery from

discharging again, latch-off is released when input

power is recycled.

Switching Battery Charger

ACT2813/ACT2813C is configured in charge mode

(buck mode) when VIN is valid. In this mode, the

battery is charged with preconditioning, fast charge,

top-off and end of charge (EOC). The typical charge

management is shown in Figure 3 and Figure 4.

CC/CV Regulation Loop

There are CC/CV regulation loops built in ACT2813/

ACT2813C, which regulates either current or

voltage as necessary to ensure fast and safe

charging of the battery. In a normal charge cycle,

this loop regulates the current to the value set by

the external resistor at the ICST pin. Charging

continues at this current until the battery cell voltage

reaches the termination voltage. At this point the

CV loop takes over, and charge current is allowed

to decrease as necessary to maintain charging at

the termination voltage.

Precondition Charge

A new charging cycle begins with the precondition

state, and operation continues in this state until VBAT

exceeds the precondition threshold voltage. When

operating in precondition state, the cell is charged

at a reduced current, 10% of the programmed

maximum fast charge constant current. Once VBAT

reaches the precondition threshold voltage the state

machine jumps to the fast charge state.

Fast Charge

battery

voltage

above

preconditioning

threshold, buck converter charges battery with

constant current. In fast charge state, the ACT2813/

ACT2813C charges at the current set by the

external resistor connected at the ICST pin. During

a normal charge cycle fast charge continues in CC

mode until VBAT reaches the charge termination

voltage, at which point the ACT2813/ACT2813C

charges in top off state.

Top Off

With the battery voltage approaches the EOC

voltage, charge current decreases as charging

continues. In the top off state, the cell is charged in

constant voltage (CV) mode. During a normal

charging cycle charging proceeds until the charge

current decreases below the end of charge (EOC)

threshold, defined as 15% of fast charge current.

When this happens, the state machine terminates

the charge cycle and jumps to the EOC state.

End of Charge

When charges current decreases to 15% of set fast

charge current, the buck converter goes into end of

charge mode and keep monitoring the battery

voltage.

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