ZHCSI54A September 2016 – May 2018 BQ25890H
PRODUCTION DATA.
The charger device closely monitors the RBFET (Q1), and LSFET (Q3) current to ensure safe boost ode operation. During overcurrent condition when output current exceed (IOTG_OCP) the device operates in hiccup mode for protection. While in hiccup mode cycle, the device turns off RBFET for tOTG_OCP_OFF (30 ms typical) and turns on RBFET for tOTG_OCP_ON (250 µs typical) in an attempt to restart. If the overcurrent condition is removed, the boost converter returns to normal operation. When overcurrent condition continues to exist, the device repeats the hiccup cycle until overcurrent condition is removed. When overcurrent condition is detected the fault register bit BOOST_FAULT is set high to indicate fault in boost operation. An INT is also asserted to the host.