ACT2861 datasheet(32/97 Pages) QORVO

32 / 97 page

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

32 of 97

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ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

Input VIN OV (30V) – If VIN is above VIN_OVP

(30V), nIRQ is asserted. This is a level triggered

event. This fault is detected in HIZ mode,

Charge Mode, and OTG Mode.

10. VBAT Above VOTG_VBAT_OV (23.5V) - If VBAT is

above VOTG_VBAT_OV (23.5V), nIRQ is asserted.

This is a level triggered event. 1 must be written

into nIRQ_CLEAR to deassert nIRQ. This fault

is detected in HIZ mode, Charge Mode, and

OTG Mode.

Charge Mode nIRQ Conditions

Input Undervoltage - Any time VIN is below

VIN_UVLO (3.9V) threshold, nIRQ is asserted.

This is a level triggered event. VIN must be in

the valid range and high AND 1 must be written

into nIRQ_CLEAR to deassert nIRQ.

Fast Charge Safety Timer Expired – If the

Low Battery Safety Timer expires or the Fast

Charge Safety Timer expires during charge

mode, nIRQ is asserted. This is level triggered

event. The safety timers must be cleared AND

1 must be written into nIRQ_CLEAR to deassert

nIRQ. The fault timers can be cleared via I2C or

by exiting and re-entering Charge mode.

Charge Completed – When the IC’s Charge

state machine moves from the FASTCHG state

to the CHGFULL or CHGTERM states, nIRQ is

asserted. This is an edge triggered event. 1

must be written into nIRQ_CLEAR to deassert

nIRQ. Note that the state machine can stay in

the CHGFULL or CHGTERM states without re-

asserting nIRQ.

Battery Overvoltage - If the VBAT pin voltage

exceeds the VBAT Overvoltage threshold VBA-

TOVP

during Charge mode, nIRQ is asserted.

This is a level triggered function. The battery

voltage must be below VBAT OVP AND a 1

must be written into nIRQ_CLEAR to deassert

nIRQ.

Battery Temp Suspend – If the battery tem-

perature measured by the TH pin exceeds the

JEITA or Battery Temp registers settings for

Hot or Cold and causes the Charging state ma-

chine to move to a suspend mode, nIRQ is as-

serted. This is an edge triggered event. A 1

must be written into nIRQ_CLEAR to deassert

nIRQ.

OTG Mode nIRQ Conditions

OTG Mode Battery Cutoff – If the VBAT pin

voltage is below the VOTG_VBAT_CUTOFF threshold,

nIRQ is asserted. This is a level triggered event.

VBAT must be in the valid range AND 1 must

be written into nIRQ_CLEAR to deassert nIRQ.

OTG Light Load Disable State - Any time the

IC enters the OTG_LL_DIS state, nIRQ is as-

serted. This is an edge triggered event. A 1

must be written into nIRQ_CLEAR to deassert

nIRQ. The IC does not need to exit the

OTG_LL_DIS state to de-assert nIRQ.

OTG Hiccup Mode / Vout Fault State - Any

time the IC enters the OTG_HICCUP state,

nIRQ is asserted. This is an edge triggered

event. A 1 must be written into nIRQ_CLEAR to

deassert nIRQ.

Battery Temperature – If the battery tempera-

ture measured by the TH pin exceeds the

JEITA or Battery Temp registers settings for

Hot or Cold and causes the OTG state machine

to move to the OTG_RST state, nIRQ is as-

serted. This is an edge triggered event. A 1

must be written into nIRQ_CLEAR to deassert

nIRQ.

Die Thermal Regulation

The ACT286x monitors the internal junction tempera-

ture, TJ, to avoid overheating When TJ exceeds the

maximum thermal regulation limit set by I2C bits TREG

[1:0], the IC reduces the output current to lower the die

temperature. This function works in both Charge mode

and OTG mode. In Charge mode, the IC reduces the

charging current. This has no effect other than to

lengthen the charging time. In OTG mode, it reduces the

output current limit value. If the load current is not re-

duced, the OTG output voltage will drop and generate

an OTG undervoltage fault. The maximum operating

junction temperature is programmable to 80ºC, 100ºC,

or 120ºC to allow the user to optimize their system ther-

mal performance. This function can be disabled by set-

ting TREG[1:0] = 00.

When Thermal Regulation is active in Charge mode, the

Low

Battery

Safety

and

Fast

Charge

Safety

Timers both run at ½ speed to increase the overall

safety timeout window.

SHIP MODE

The ACT2861 contain a SHIP MODE feature that re-

duces battery current consumption to 1uA. This is espe-

cially useful when a battery powered application is

shipped to the store and sits on the shelf for long peri-

ods of time. In SHIP MODE the IC turns off all functions

except the SHIPM pin and the VIN voltage detection cir-

cuitry. The IC state machine always starts in SHIP

MODE state. There are two ways to exit SHIP MODE.

ACT2861 Datasheet(PDF) 32 Page - Qorvo, Inc

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