Single Synchronous Buck Controller


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The RT8209L/M PWM controller provides high efficiency, excellent transient response, and high DC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core, I/O, and chipset RAM supplies in notebook computers.
The constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides 100ns "instant-on" response to load transients while maintaining a relatively constant switching frequency.
The RT8209L/M achieves high efficiency at a reduced cost by eliminating the current sense resistor found in traditional current mode PWMs. Efficiency is further enhanced by its ability to drive very large synchronous rectifier MOSFETs. The buck conversion allows this device to directly step down high voltage batteries for low voltage supplies as low as 0.75V. The RT8209L is in a WQFN-16L 3x3 package, the RT8209M is in a WQFN-14L 3.5x3.5 package.


  • Notebook Computers
  • System Power Supplies
  • I/O Supplies
  • Notebooks
TitleLast UpdateShareDownload
Single Synchronous Buck Controller2010/06/23