US 12,355,351 B2
Low power boost converter startup with soft start and output voltage overshoot limiting
Srikanth Govindarajulu, Austin, TX (US); Hatem M. Osman, Austin, TX (US); and Michael D. Mulligan, Austin, TX (US)
Assigned to Silicon Laboratories Inc., Austin, TX (US)
Filed by Silicon Laboratories Inc., Austin, TX (US)
Filed on May 31, 2022, as Appl. No. 17/828,993.
Prior Publication US 2023/0387800 A1, Nov. 30, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/36 (2007.01)
CPC H02M 3/158 (2013.01) [H02M 1/36 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating a DC-DC converter circuit comprising:
in response to detecting a startup condition, charging an output capacitance coupled to an output node of the DC-DC converter circuit at a first rate in a first phase of a multi-phase startup mode of operation of the DC-DC converter circuit; and
in response to an indication of an output voltage on the output node approaching an input voltage on an input node of the DC-DC converter circuit, controlling a current through an inductor using an oscillating signal in a second phase of the multi-phase startup mode of operation, thereby adjusting the output voltage to equal a target voltage level.