BQ25713 datasheet(30/111 Pages) TI2

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8.3.8 Device HIZ State

When input source is present, the charger can enter HIZ mode (converter shuts off) when ILIM_HIZ pin voltage

is below 0.4 V or EN_HIZ is set to 1b. The charger is in the low quiescent current mode with REGN LDO

enabled, ADC circuits are disactivated to reduce quiescent current. In order to exit HIZ mode, ILIM_HIZ pin

voltage has to be higher than 0.8 V and EN_HIZ bit has to be set to 0b.

8.3.9 USB On-The-Go (OTG)

The device supports USB OTG operation to deliver power from the battery to other portable devices through

USB port. The OTG mode output voltage is set in OTGVoltage register REG0x07/06() with 8-mV LSB range

from 3.0 V to 24 V. The OTG mode output current is set in OTGCurrent register REG0x09() with 100-mA LSB

range from 0 A to 12.7 A under 5-mΩ input current sensing. Both OTG voltage and OTG current are qualified for

USB-C™ programed power supply (PPS) specification in terms of resolution and accuracy. The OTG mode can

be enabled following below steps:

• Set target OTG current limit in OTGCurrent register, VBUS is below VVBUS_CONVENZ.

• Set OTG_VAP_MODE = 1b and EN_OTG = 1b.

• OTG/VAP/FRS pin is pulled high.

• 15 ms after the above conditions are valid, converter starts and VBUS ramps up to target voltage. CHRG_OK

pin goes HIGH if OTG_ON_CHRGOK= 1b.

OTG/VAP/FRS pin is used as multi-function to enable OTG and FRS mode.

8.3.10 Converter Operation

The charger operates in buck, buck-boost and boost mode under different VBUS and VSYS combination. The

buck-boost can operate seamlessly across the three operation modes. The 4 main switches operating status

under continuous conduction mode (CCM) are listed below for reference.

Table 8-3. MOSFET Operation

MODE

BUCK

BUCK-BOOST

BOOST

Switching

OFF

Switching

8.3.11 Inductance Detection Through IADPT Pin

The charger reads both converter operation frequency and the inductance value through the resistance tied to

IADPT pin before the converter starts up. The resistances recommended for 2.2-μH (800 kHz), 3.3-μH (800 kHz)

and 4.7-μH (400 kHz) inductance refers to Table 8-4. A surface mount chip resistor with ±3% or better tolerance

must to be used for an accurate inductance detection.

Table 8-4. Inductor Detection through IADPT Resistance

INDUCTOR IN USE

RESISTOR ON IADPT PIN

2.2 µH (recommended for 800 kHz)

137 kΩ or 140 kΩ

3.3 µH (recommended for 800 kHz)

169 kΩ

4.7 µH (recommended for 400 kHz)

191 kΩ or 187 kΩ

8.3.12 Converter Compensation

The charger employs two compensation pins COMP1 and COMP2 for converter compensation purpose,

appropriate RC network is needed to guarantee converter steady state and transient operation. Under different

operation frequency corresponding RC network value needs to be configured respectively as shown in below

table. The definition of these RC components can be referred to Figure 8-2. It is not recommended to change the

compensation network value due to the complexity of various operation modes.

BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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