BQ25872 Datasheet, PDF (21/68 Pages) Texas Instruments – Battery Switch Charger

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bq25872
SLUSCQ6 – OCTOBER 2016
Feature Description (continued)
8.3.5.4 IBUS and VBUS Protection
Over-current protection on VBUS (IBUS_OCP) monitors the current flow from VBUS to VOUT pins. IBUS_OCP
protection is always active when the battery switch is enabled, and the protection has a deglitch time that
depends on the OCP_RES setting as described below.
If OCP_RES = ‘0’ (blanking mode), the device will wait t_{IBUS_OCP_BLANK} before disabling the battery switch within
t_{OFF_FET} and setting CHG_EN to ‘0’. When the battery switch is disabled, IBUS_OCP_FLT is set to ‘1’. If during
the t_{IBUS_OCP_BLANK} duration a short circuit protection scenario occurs, then the device will follow the behavior as
listed in short circuit protection (SCP). Once the battery switch is disabled, CHG_EN is set to ‘0’ and host
intervention is required to set CHG_EN to ‘1’ to enable the battery switch again.
IBUS_OCP
I_SCP
IBUS_OCP
t_SCP
I_SCP
IBUS
IBUS
t_{OFF_FET}
VOUT
VOUT
t_{IBUS_OCP_BLANK}
t_{IBUS_OCP_BLANK}
time starts here
Figure 11. IBUS OCP and SCP
t_{OFF_FET}
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