SLVSAA4G June 2010 – February 2018 TPS65251
By pulling the LOW_P pin high all converters will operate in pulse-skipping mode, greatly reducing the overall power consumption at light and no load conditions. Although each buck converter has a skip comparator that makes sure regulation is not lost when a heavy load is applied and low-power mode is enabled, system design needs to make sure that the LP pin is pulled low for continuous loading in excess of 100 mA.
When low-power is implemented, the peak inductor current used to charge the output capacitor is:
Where TSLEEP_CLK is half of the converter switching period, 2/fSW.
The size of the additional ripple added to the output is:
And the peak output voltage during low-power operation is: