US 11,990,832 B2
Multi-mode transition for a DC-DC converter
Mahraj Sivaraj, Cedar Park, TX (US); and John Pigott, Phoenix, AZ (US)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Mar. 14, 2022, as Appl. No. 17/694,520.
Prior Publication US 2023/0291301 A1, Sep. 14, 2023
Int. Cl. H02M 1/08 (2006.01); H02M 1/088 (2006.01); H02M 3/158 (2006.01)
CPC H02M 1/088 (2013.01) [H02M 3/158 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multi-mode transition circuit for a DC-DC converter, the multi-mode transition circuit comprising:
a transconductance amplifier operably connected to a first resistor-capacitor (RC) network and a plurality of switches;
a comparator operably connected to a second RC network, wherein the first and second RC networks are operably connected to a reference voltage;
a multiplexer operably connected to the transconductance amplifier and the comparator; and
an operation mode selector configured to enable or disable the transconductance amplifier and turn on or off the switches in a sequence when transitioning between a pulse-frequency modulation (PFM) mode and a pulse-width modulation (PWM) mode.