ACT2861 datasheet(21/97 Pages) QORVO

21 / 97 page

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

21 of 97

www.qorvo.com

ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

the IPRECHG level. The default precharge current is 10%

of the fast charge current which is set by the OLIM re-

sistor. It is adjustable between 5% and 20% of the fast

charge current using the I2C bits IPRECHG[3:0] in reg-

ister 0x19h.

During normal charging, the charger enters PCOND

when the battery voltage is greater than VBATSHORT

for 16ms.

The system continuously monitors the battery voltage

and

if the battery voltage

is greater than the

VBAT_LOW voltage threshold for 16ms, the charger ex-

its the PCOND state and moves to the Fast Charge

state. Note: If the battery voltage is above the

VBAT_LOW voltage when entering this state, the

charger still charges at the IPRECHG current for 16ms

before moving to the Fast Charge state.

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

ning to detect a fault conditions or bad battery. See the

Fast 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 Low Battery Safety Timer timeout or Battery OV fault

during this state causes the charger to move to the Fault

State, and disable charging. An input voltage 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 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 Precondition BAT Temp Suspend

(PCSUSPEND)

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 PCSUSPEND from the PCOND

state. The charger transitions back to the PCOND state

and resumes charging when the temperature returns to

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

PCSUSPEND state by disabling the TH input via I2C.

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

but held at its current value. The timer resumes counting

when charging resumes.

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

indicate a fault condition.

Battery Fast Charge State (FASTCHG)

The Fast Charge state is the state where charger pro-

vides full charging current to the battery. The ACT2861

voltage and temperature protections ensure that the

battery only enters the Fast Charge state when the con-

ditions are safe for fast charging.

During normal charging, the charger enters FASTCHG

when the battery voltage is greater than VBAT_LOW for

16ms.

If the charge current drops below ITERM for 750ms, the

charger assumes the battery is charged and the state

machines moves to either Charge Termination state or

the Charge Full State.

In the FASTCHG state, the charger regulates the con-

stant charging current, ICHG, until the battery voltage

reaches the VBAT_REG voltage. Then it regulates the

battery voltage to a constant voltage. If in voltage regu-

lation mode and current is pulled from the battery caus-

ing its voltage to drop below VBAT_REG, the charger

seamlessly switches back into constant current mode.

When the battery voltage reaches the VBAT_REG volt-

age, the current slowly decays as the battery “tops off”.

When the current drops to the termination current,

ITERM, the battery is fully charged.

The VBAT_REG battery voltage can be adjusted using

the I2C bits VTERM[10:0] bits in registers 0x11h and

0x12h.

The ICHG current can be controlled with the external

resistor on the OLIM pin and by the I2C bits IFCHG[6:0]

in register 0x18h. The I2C current adjustable is pro-

grammed as a percentage of the full current level set by

the OLIM resistor.

The termination current can be adjusted using the I2C

bits ITERM[3:0] in register 0x19h.

In this state, the Low Battery Safety Timer is turned off

and reset. The Fast Charge Safety Timer starts running

at the nominal rate to detect faults with battery charging.

This timer can be adjusted between 30 minutes and 16

hours, using the I2C bits FC_SAFETY_TIMER in regis-

ter 0x1Bh. If a battery temperature fault condition is de-

tected, the charger moves to the FAULT state. See the

Charge Safety Timers section for further details.

A Fast Charge Safety Timer timeout or Battery OV fault

during this state causes the charger to move to the Fault

State, and disable charging. An input voltage UV or OV

condition also moves the state machine into the Fault

state. Finally, a fault on the VREG LDO, which is not

ACT2861 Datasheet(PDF) 21 Page - Qorvo, Inc

ACT2861 Datasheet(HTML) 21 Page - Qorvo, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97

Datasheet Download

Link URL