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on. When VBUS pin voltage falls below VACOV_FALL for more than 1 ms, it is considered as adapter voltage

returns back to normal voltage. CHRG_OK pin is pulled high by external pull-up resistor. The converter resumes

if enable conditions are valid.

8.3.21.3 Input Overcurrent Protection (ACOC)

If the input current exceeds the 1.33× or 2× of ILIM2_VTH set point ACOC_TH (adjustable through ACOC_VTH),

after 250-μs rising edge de-glitch time converter stops switching because of input overcurrent protection

(ACOC). ACOC is a non-latch fault, if input current falls below set point, after 250-ms falling edge de-glitch

time converter starts switching again. ACOC is disabled by default and need to be enabled by configuring

EN_ACOC=1b. When ACOC is triggered, its corresponding status bit Fault ACOC will be set and it can be

cleared by host read.

8.3.21.4 System Overvoltage Protection (SYSOVP)

When the converter starts up, the BQ25730 reads CELL_BATPRESZ pin configuration and sets ChargeVoltage()

and SYSOVP threshold (1s – 6 V, 2s – 12 V, 3s/4s – 19.5 V and 5s – 25 V ). Before ChargeVoltage() is written

by the host, the battery configuration will change with CELL pin voltage. When SYSOVP happens, the device

latches off the converter. Fault SYSOVP status bit is set to 1. The user can clear latch-off by either writing 0

to the Fault SYSOVP status bit or removing and plugging in the adapter again. After latch-off is cleared, the

converter starts again.

8.3.21.5 Battery Overvoltage Protection (BATOVP)

Battery overvoltage may happen when user plugs in a wrong battery or a wrong regulation voltage is written

into ChargeVoltage() register. The BATOVP rising threshold is 104% of regulation voltage set in ChargeVoltage()

condition is triggered: if charge is enabled (charge current is not 0A) converter should shut down with both

HS MOSFET and LS MOSFET turned off; if charge is disabled the converter should keep operating without

disturbance until battery rise up system voltage to be high enough trigger SYSOVP. There is no user status bit

to monitor. Note VBAT voltage used for BATOVP detection is based on SRN pin measurement. When BATOVP

is triggered with charge enabled, 40-mA discharge current is added on VSYS pin will help discharge battery

voltage.

8.3.21.6 Battery Discharge Overcurrent Protection (BATOC)

The charger monitors the battery discharge current to provide the battery overcurrent protection (BATOC)

through voltage across SRN and SRP. BATOC can be enabled by configuring EN_BATOC=1b. BATOC threshold

is selected either 133% of IDCHG_TH2 or 200% IDCHG_TH2 through BATOC_VTH bit. The threshold is also

clamped between 100 mV and 360 mV SRN-SRP cross voltage.

When discharge current is higher than the threshold after 250-μs deglitch time, BATOC fault is triggered, status

bit Fault BATOC is set accordingly. Converter shuts down when BATOC is asserted to disable OTG operation

and reduce discharge current. BATFET status is not impacted if need to supplement power to system.

BATOC is not a latch fault, therefore after BATOC fault is removed, with 250-ms relax time, converter resume

switching automatically. But status bit Fault BATOC is only cleared by host read.

8.3.21.7 Battery Short Protection (BATSP)

For multicell operation, if BAT voltage falls below VSYS_MIN during charging, the maximum charger current

is limited to 384 mA. For single-cell operation, if BAT voltage falls below 3.0 V during charging, the maximum

charge current is limited to 384 mA; if BAT voltage is between 3.0 V and VSYS_MIN then maximum charge

current is limited to 2 A. Note VBAT voltage used for battery short detection is based on SRN pin measurement.

8.3.21.8 System Undervoltage Lockout (VSYS_UVP) and Hiccup Mode

The charger VSYS_UVP is enabled by POR ( VSYS_UVP_ENZ=0b) and can be disabled by writing

VSYS_UVP_ENZ=1b. This protection is mainly defined to protect converter from system short circuit under

both startup and steady state process. VSYS pin is used to monitor the system voltage, when VSYS is lower

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BQ25730

SLUSE65A – FEBRUARY 2021 – REVISED JANUARY 2024

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