Exar – XR75100: 40V Synchronous Step Down COT Controller Simplifies Point-of-Load Supply Designs

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The XR75100 is a synchronous step down controller for point-of-load supplies up to 20A. A wide 5V to 40V input voltage range allows for single supply operation from industry standard 12V, 18V, and 24V DC and AC rails. The patented emulated current mode Constant On-Time (COT) control scheme provides extremely fast line and load transient response using ceramic output capacitors. It requires no loop compensation hence simplifying circuit implementation and reducing overall component count.

FEATURES

  • 20A capable step down controller
  • Integrated high current 2A/3A drivers
  • No loop compensation required
  • Ceramic output capacitor stable operation
  • Constant 100kHz to 800kHz frequency
  • Programmable current limit
  • 5.5V to 40V input voltage range
  • 0.6V adjustable output voltage
  • <0.01%/V line regulation
  • Programmable 200ns-2μs on-time
  • Selectable CCM or CCM/DCM operation
  • 1k MSRP: $1.59

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