Exar – XR76203/205/208: 40V PowerBlox™ 3A/5A/8A Synchronous Step Down COT Regulator

The XR76203, XR76205 and XR76208 are synchronous step down regulators combining the controller, drivers, bootstrap diode and MOSFETs in a single package, supporting point-of-load (POL) supplies of 3A, 5A and 8A, respectively. The devices are designed to provide a wide 5V to 40V input voltage range while providing excellent transient response and output accuracy over the entire voltage range using Exar’s proprietary emulated current mode constant on-time (COT) control loop. The control loop also provides 0.07% load and 0.15% line regulation and maintains constant operating frequency.


  • >0.6V adjustable output voltage
  • Stable ceramic output capacitor operation
  • Constant 100kHz to 800kHz frequency
  • Programmable hiccup current limit with precision enable and power good flag
  • Programmable soft start
  • No loop compensation required
  • Programmable 200ns to 2μs on-time
  • Selectable CCM or CCM/DCM
  • Thermal compensation
  • 30-pin 5 x 5mm QFN package
  • 1k MSRP: $1.85, $2.30 and $2.90 US respectively