SLVS839F July 2008 – October 2014 TPS54331
The TPS54331 device is designed to operate in pulse skipping Eco-mode at light load currents to boost light load efficiency. When the peak inductor current is lower than 160 mA (typical), the COMP pin voltage falls to 0.5 V (typical) and the device enters Eco-mode. When the device is in Eco-mode, the COMP pin voltage is clamped at 0.5-V internally which prevents the high-side integrated MOSFET from switching. The peak inductor current must rise above 160 mA for the COMP pin voltage to rise above 0.5 V and exit Eco-mode. Because the integrated current comparator catches the peak inductor current only, the average load current entering Eco-mode varies with the applications and external output filters.