ZHCSK69F August 2019 – November 2021 TPSM82821 , TPSM82821A , TPSM82822 , TPSM82822A , TPSM82823 , TPSM82823A
PRODUCTION DATA
The switch current limit prevents the device from high inductor current and from drawing excessive current from the battery or input voltage rail. Excessive current can occur with a shorted or saturated inductor or a heavy load or shorted output circuit condition. If the inductor current reaches the threshold of ILIMF, the high-side MOSFET is turned off and the low-side MOSFET remains off while the inductor current flows through its body diode and quickly ramps down.
When this switch current limit is triggered 32 times, the device stops switching. The device then automatically starts a new start-up after a typical delay time of 128 μs has passed. This is named HICCUP short-circuit protection. The device repeats this mode until the high load condition disappears.