ACT2861 datasheet(20/97 Pages) QORVO

20 / 97 page

Data Sheet Rev. F, April 2022 | Subject to change without notice

20 of 97

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ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

Figure 3: Operating Modes State Machine

The system continuously monitors the battery voltage

and

if the battery voltage

is greater than the

VBATSHORT voltage threshold for 16ms, the charger

exits the SCOND state and moves to the Precondition

state.

The

battery

short

detection

voltage,

VBAT_SHORT, is adjustable by I2C bits VBAT_SHORT

in register 0x0Bh. Note: If the battery voltage is above

the VBATSHORT voltage when entering this state, the

charger still charges at the ISHRT current for 16ms be-

fore moving to the Precondition state.

During this state, the Low Battery Safety Timer is run-

ning to detect fault conditions or bad battery. See the

Charge Safety Timers section for further details. The

Low Battery Safety Timer is a cumulative timer for the

SCOND, and PCOND states and is fixed at 2 hours.

A Safety Timer timeout or Battery OV during this state

causes the charger to move to the Fault State, which

disables charging. An input voltage OV or UV condition

also moves the state machine into the Fault state. Fi-

nally, a fault on the VREG LDO, which is not masked

with the DIS_CHG_VREG_FLT register also moves the

state machine into the Fault state.

During this state, the VIN voltage and VIN Current reg-

ulation loops are active to ensure the input supply power

ratings are not exceeded. Additionally, the thermal reg-

ulation loop is active to keep the ACT2861 junction tem-

perature at or below the desired maximum junction tem-

perature. See the appropriate sections for more details.

During this state the nCHG pin is pulled low to indicate

charging is in progress.

Battery Short Condition Temp Suspend

(SCSUSPEND)

This state prevents charging when the battery tempera-

ture measured by the TH pin exceeds the JEITA or Bat-

tery Temp registers settings for Hot or Cold. All switch-

ing stops and charging is suspended. The state ma-

chine only enters SCSUSPEND from the SCOND state.

The charger transitions back to the SCOND state and

resumes charging when the temperature returns to al-

lowable levels. The system can force the IC out of the

SCSUSPEND state by disabling the TH input via I2C.

In this state, the Low Battery Safety Timer is suspended,

but held at its current value, in SCSUSPEND state. The

timer resumes counting when charging resumes.

During this state the nCHG output pin blinks at 1 HZ to

indicate a fault condition.

Battery Precondition Condition State (PCOND)

The PCOND state preconditions the battery with a low

charge current to avoid damage to fully discharged bat-

teries. In this state the charger charges the battery at

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