SNVS625G February 2011 – March 2022 LM21215
PRODUCTION DATA
In the unfortunate event that the output is shorted with a low impedance to ground, the LM21215 limits the current into the short by resetting the device. A short-circuit condition is sensed by a current-limit condition coinciding with a voltage on the FB pin that is lower than 100 mV. When this condition occurs, the device begins its reset sequence, turning off both power FETs and discharging the soft-start capacitor after tRESETSS (nominally 110 µs). The device will then attempt to restart. If the short-circuit condition still exists, it will reset again, and repeat until the short-circuit is cleared. The reset prevents excess current flowing through the FETs in a highly inefficient manner, potentially causing thermal damage to the device or the bus supply.