ACT2861 datasheet(38/97 Pages) QORVO

38 / 97 page

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

38 of 97

www.qorvo.com

ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

NTC

REF_60

REF_50

REF_45

REF_0

REF_10

NTC

10KΩ @

25C

ENABLE

Figure 13: TH Pin Resistor Network

JEITA Battery Temperature Control

To improve the safety of charging Li-ion batteries, the

JEITA guideline was released on April 20, 2007. The

guideline emphasizes the importance of avoiding a high

charge current and high charge voltage at both extreme

low and high temperature ranges. To comply with JEITA

battery charging requirements, and to improve battery

reliability and safety, the ACT2861 reduces the termina-

tion voltage and/or the charging current when the bat-

tery is at temperature extremes. When the battery tem-

perature is outside the normal charging range, IC either

reduces the safety timer speeds or stops the timers until

the temperature goes back into the normal charging

range. When stopped, the timers are not reset. They

hold their value and resume normal counting when

charging restarts. Refer to the Safety Timer Speed Set-

tings table for specific details.

The ACT2861 contains default JEITA voltage, current,

and temperature limits. These voltage and current set-

tings are configurable via I2C. The temperature limits

are fixed. To use the JEITA limits, enable thermal mon-

itoring with bit DIS_TH = 0 and set I2C bit DIS_JEITA in

Mode T0 - Tbattery < 0degC: All battery charging is sus-

pended until the temperature goes back above 0deg C.

Both the Fast Charge Safety Timer and the Low Battery

Safety Timers are suspended. The T0 temperature is

fixed at 0deg C and cannot be changed.

Mode T1-T2 – 0degC < Tbattery < 10degC: Battery

charging in this region is a function of the I2C bits

JEITA_ISETC in register 0x1Ch. Depending on these

fully suspended to not changed. Termination voltage is

not changed. ISHRT and IPRECHARGE currents are not af-

fected. Table 5 shows the resulting charge functionality

and safety timer settings.

Mode T3-T5 – 45degC < Tbattery < 60degC: Battery

charging in this region is a function of the I2C bits

JEITA_ISETH and JEITA_VSETH in register 0x1Ch.

When JEITA_VSETH is a non-zero value, the IC re-

duces the termination voltage by 200mV to 750mV be-

low

the

normal

termination

voltage.

When

JEITA_VSETH = 000 and JEITA_ISETH = 0, fast

charge current is set to 50% of default. When

JEITA_ISETH = 1, charging current and termination

voltage are not changed. ISHRT and IPRECHARGE currents

are not affected.

Mode T6 – Tbattery > 60degC: All battery charging is sus-

pended until the temperature goes back below 60deg C.

Both the Fast Charge Safety Timer and the Low Battery

Safety Timers are suspended. The T6 temperature is

fixed at 60deg C and cannot be changed.

Table 5 shows the resulting charge functionality and

safety timer settings. Figure 13 shows this in graphical

form.

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