SLVS875C January 2009 – November 2014 TPS54332
The 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 pulse skip threshold, 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.