BQ25713 datasheet(33/111 Pages) TI2

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8.3.18 Input Current Optimizer (ICO)

For a recognized input adapter, IINDPM can be configured precisely to prevent adapter collapasing. When a

third party unknown adapter is used, then input voltage regulation (VINDPM) feature can be leveraged to prevent

input crash. With the increasing of input current, voltage drops along the input cable also increases and voltage

measured it charger input port decreases accordingly. VINDPM feature can limit input power from adapter by

regulating VBUS at certain value configured at InputVoltage register(0x0Bh/0Ah[]). However, the adapter may

still overheat when it is kept running at its voltage limit for a long period of time. Therefore, it is preferred to

operate the third party adapter slightly under its current rating. The Input Current Optimizer (ICO) feature can

automatically maximize the power of unknown input adapter without continuously working under VINDPM. Note

the ICO feature can only be employed when the adapter input current limit is at least 500 mA. Please contact

factory for more detail information about ICO feature.

8.3.19 Two-Level Adapter Current Limit (Peak Power Mode)

Usually adapter can supply current higher than DC rating for a few milliseconds to tens of milliseconds. The

charger employs two-level input current limit, or peak power mode, to fully utilize the overloading capability

and minimize battery discharge during system load transient. The level 1 current limit, or ILIM1, is the same as

adapter DC current, set in IIN_DPM register. The level 2 overloading current, or ILIM2, is set in ILIM2_VTH, as a

percentage of ILIM1.

When the charger detects input current surge and battery discharge due to load transient (both the adapter

and battery support the system together), or when the charger detects the system voltage starts to drop below

VSYS_MIN setting due to load transient (only the adapter supports the system), the charger will first apply ILIM2

for TOVLD (PKPWR_TOVLD_DEG register bits), and then ILIM1 for up to TMAX – TOVLD time. TMAX is programmed

in PKPWR_TMAX register bits. After TMAX, if the load is still high, another peak power cycle starts. Charging is

disabled during TMAX and TOVLD already expires; once TMAX, expires, a new cycle starts and resumes charging

automatically.

To prepare entering peak power follow below steps:

• Set EN_IIN_DPM=1b to enable input current dynamic power management.

• Set EN_EXTILIM=0b to disable external current limit.

• Set register IIN_HOST based on adapter output current rating as the level 1 current limit(ILIM1)

• Set register bits ILIM2_VTH according to the adapter overload capability as the level 2 current limit(ILIM2) .

• Set register bits PKPWR_TOVLD_DEG as ILIM2 effective duration time for each peak power mode operation

cycle based on adapter capability.

• Set register bits PKPWR_TMAX as each peak power mode operation cycling time based on adapter

capability.

Depends on the battery existence and charge status peak power mode can be finally enabled with two different

approaches:

• When battery is depleted in which VBAT is lower than VSYS_MIN setting or battery is removed, host need

to set EN_PKPWR_VSYS=1b to enable peak power mode triggered by system voltage undershoot. The

under-shoot threshold is the VSYS_MIN register setting which is the system regulation point before load

transient happens. Typical application waveform refer to Figure 9-22.

• When battery is not depleted in which VBAT is higher than VSYS_MIN setting, host need to set

EN_PKPWR_IIN_DPM=1b to enable peak power mode triggered by input current overshoot. The overshoot

threshold is IIN_DPM register which is same as the level 1 current limit (ILIM1). Typical application waveform

refer to Figure 9-23.

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BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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