ACT2861 datasheet(22/97 Pages) QORVO

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

22 of 97

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ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

masked with the DIS_CHG_VREG_FLT register moves

the state machine into the Fault state.

If the battery voltage drops below the VBAT_LOW volt-

age for 16ms, the charger goes back into the Battery

Precondition 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.

Fast Charge Temp Suspend (FCSUSPEND)

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. The state

machine only enters FCSUSPEND from the FASTCHG

state. The charger transitions back to the FASTCHG

state and resumes charging when the temperature re-

turns to allowable levels. The system can force the IC

out of the FCSUSPEND state by disabling the TH input

via I2C.

In this state, the Fast Charge Safety Timer is suspended,

but held at its current value. The timer resumes counting

when charging resumes.

During this state the nCHG output blinks at 1HZ to indi-

cate a fault condition.

Charge Full State (CHGFULL)

The Charge Full state functionality is the same as the

FASTCHG state. The charger can stay in the CHGFULL

state indefinitely. It keeps a fully charged battery regu-

lated to the VBAT_REG voltage. If something pulls cur-

rent from the battery, the charger supplies current to

maintain the battery voltage at VBAT_REG. The maxi-

mum charge current is still limited by the external OLIM

resistor and the IFCHG[6:0] register.

During normal charging, the charger enters CHGFULL

state from the FASTCHG state when the charging cur-

rent drops below ITERM for greater than 750ms AND

the I2C bit EN_TERM = 0.

If the charge current exceeds the ITERM current for

16ms,

the

battery

voltage

drops

below

VBAT_GOOD for 16ms, the IC exits the Charge Full

state and moves back to the FASTCHG state.

A Battery Temp or Battery OV fault during this state

causes the charger to move to the Fault state and disa-

ble charging. An input UV or OV condition also moves

the state machine into the Fault state. Finally, a fault on

the VREG LDO, which is not masked with the

DIS_CHG_VREG_FLT register moves the state ma-

chine into the Fault state.

In this state, the Fast Charge Safety Timer and the Low

Battery Safety Timer are reset and held at 0.

During this state the nCHG pin is HIZ to indicate the

charging has completed and the Fast Charge Safety

Timer is reset and held at 0.

Charge Full Suspend (CFSUSPEND)

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. The state

machine only enters CFSUSPEND from the CHGFULL

state. The charger transitions back to the CHGFULL

state and resumes charging when the temperature re-

turns to allowable levels. The system can force the IC

out of the CFSUSPEND state by disabling the TH input

via I2C.

In this state, the Fast Charge Safety Timer is still held

at 0.

During this state the nCHG output blinks at 1HZ to indi-

cate a fault condition.

Battery Termination State (CHGTERM)

In this state, the charger is disabled and does not supply

any current to the battery. It monitors the battery voltage

to check for the condition when the battery voltage

drops to VTERM-VRECHARGE. The VRECHARGE

voltage is typically 100mV or 150mV per cell. Once the

battery voltage drops below the threshold, the IC enters

the Fast Charge state and recharges the battery.

During normal charging, the charger enters this state

when the charging current drops below ITERM for

greater than 750ms AND the I2C bit EN_TERM = 1.

In this state, the Fast Charge Safety Timer and the Low

Battery Safety Timer are reset and held at 0.

ACT2861 Datasheet(PDF) 22 Page - Qorvo, Inc

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