BQ25713 datasheet(28/111 Pages) TI2

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IDCHG_TH2

IDCHG_DEG1

IDCHG_TH1

/PROCHOT

IDCHG_DEG1

IDCHG_DEG2

Figure 8-1. Two-Level Battery Discharging Current Trigger PROCHOT Diagram

8.3.3 Fast Role Swap Feature

Fast Role Swap (FRS) means charger quickly swaps from power sink role to power source role to provide an

OTG output voltage to accessories when the original power source is disconnected. This feature is defined to

transfer the charger from forward mode to OTG mode quickly without dropping VBUS voltage per USB-C PD

specification requirement.Please contact factory for more detail information about FRS mode.

8.3.4 CHRG_OK Indicator

CHRG_OK is an active HIGH open drain indicator. It indicates the charger is in normal operation when the

following conditions are valid:

• VBUS is above VVBUS_CONVEN

• VBUS is below VACOV_FALL

• No faults triggered such as: SYSOVP/SYSUVP/ACOC/TSHUT/BATOVP/BATOC/force converter off.

8.3.5 Input and Charge Current Sensing

The charger supports 10 mΩ and 5 mΩ for both input current sensing and charge current sensing. By default, 5

mΩ is enabled by POR setting RSNS_RAC=1b and RSNS_RSR=1b, if 10-mΩ sensing is used please configure

RSNS_RAC=0b and RSNS_RSR=0b. Lower current sensing resistor can help improve overall charge efficiency

especially under heavy load. At same time PSYS,IADPT,IBAT pin accuracy and IINDPM/ICHG/IOTG regulation

accuracy get worse due to effective signal reduction in comparison to error signal components.

When RSNS_RAC=RSNS_RSR=0b and 10 mΩ is used for both input and charge current sensing, the pre-

charge current clamp is 384 mA (2 A for 1S if VSYS_MIN>VBAT>3 V ), the maximum IIN_HOST setting is

clamped at 6.35 A, and the maximum charge current is clamped at 8.128 A.

When RSNS_RAC=RSNS_RSR=1b and 5 mΩ is used for both input and charge current sensing, the charger

will internally compensate pre-charge current clamp to be 384 mA (2 A for 1S if VSYS_MIN>VBAT>3 V )

under 5-mΩ current sensing which keeps consistent between 10 mΩ and 5 mΩ. Under 5-mΩ current sensing

application charge current range is doubled to 16.256 A. Based on EN_FAST_5MOHM register bit status and

IADPT pin resistor the maximum input current can be configured referring to Table 8-1:

For defined current sense resistors (10 mΩ/5 mΩ), PSYS function is still valid when unsymmetrical input current

sense and charge current sense resistors are used. But RSNS_RAC and RSNS_RSR bit status have to be

consistent with practical resistors used in the system.

BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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BQ25713 Datasheet(PDF) 28 Page - Texas Instruments