ACT2861 datasheet(19/97 Pages) QORVO

19 / 97 page

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

19 of 97

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ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

When modifying only certain bits within a register, take

care to not inadvertently change other bits. Inadvert-

ently changing register contents can lead to unexpected

IC behavior.

STATE MACHINE

ACT2861 contains an internal state machine with four

internal states: SHIP MODE, HIZ, OTG MODE, and

CHARGE MODE.

SHIP MODE State

SHIP MODE is the IC’s lowest power state. The

ACT2861 always starts up in SHIP MODE. This mode

is designed to reduce battery current during shipping. In

this state, the IC is completely disabled except for the

SHIPM pin and the input voltage detection circuitry. This

results in 1uA of quiescent current from the battery. The

IC can enter SHIP MODE via I2C, the SHIPM pin, or af-

ter a full power down of both input and battery voltage.

See the SHIP MODE section for more details.

HIZ State

HIZ mode is a low power state with the switching con-

verter disabled. In this mode, I2C is active and the IC

configuration can be changed. The IC enters HIZ from

SHIP MODE and then either stays in HIZ or transitions

to OTG MODE or CHARGE MODE depending on the

external voltages, the EN_CHG pin, and the nOTG pin

settings. Note that the HIZ Register overrides the

EN_CHG and nOTG pin settings and holds the IC in HIZ

mode. See the HIZ section for more details.

CHARGE MODE

In CHARGE MODE, the ACT2861 transfers power from

VIN to VBAT to charge the battery. The IC follows the

Charge State Machine. While in CHARGE MODE, the

nOTG pin is ignored until charge mode is disabled. See

the CHARGE MODE section for more details.

OTG MODE

In OTG MODE, the ACT2861 transfers power from

VBAT to VIN to provide a regulated supply from the

battery. The IC enters this mode with the nOTG Pin or

the OTG_EN_OVERRIDE register. Once in OTG Mode,

the IC follows the OTG State Machine. While in OTG

MODE, the EN_CHG input is ignored. See the OTG

MODE section for more details.

CHARGE STATE MACHINE

When the ACT2861 is in CHARGE MODE, it follows a

dedicated charging state machine that autonomously

handles complete battery charge control. This state ma-

chine is pre-configured for Li-Ion batteries. The

ACT2861 can be configured to charge any battery to-

pology using I2C.

Reset State (RESET)

All charging starts in the RESET State. In this state, all

charging is completely disabled. The IC waits until the

VIN voltage is within specification and then starts the

Startup Delay timer. This timer is controlled by I2C bits

VIN_STRT_DLY[1:0] in register 0x0Dh.

During this state the nCHG pin is pulled low to indicate

charging is in progress.

The Low Battery Safety timer and the Fast Charge

Safety Timer are both held in reset in this state.

Dead Battery Condition State (SCOND_DB)

This charging state protects against dead batteries or

battery packs where the internal battery FET has

opened. The ACT2861 always enters this state after a

valid input voltage is applied and the Startup Delay timer

is expired. If the total battery voltage is less than 3V, the

IC stays in this state and sources 10mA to the battery.

In many cases, the internal battery FET is opened and

the 10mA source current will reset the battery FET. The

IC exits this state when the battery voltage increases

above 3V for > 256us. The Low Battery Safety Timer

runs in this mode.

During this state the nCHG pin is pulled low to indicate

charging is in progress.

Battery Short Condition State (SCOND)

This state also protects against dead batteries. It pro-

vides a reduced charge current to protect over-dis-

charged batteries. The default charging current is

100 mA, but this can be modified via I2C bits

VBAT_SHORT_CURRENT in register 0 x 0 Bh.

During normal charging, the charger enters SCOND

when the battery voltage is greater than 3V for 16ms.

ACT2861 Datasheet(PDF) 19 Page - Qorvo, Inc

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