Exar Corporation introduces a new line of 40 V switching regulators to add to its popular PowerBlox™ family of DC/DC converter products. The XR76203, XR76205 and XR76208 are synchronous step-down regulators supporting point-of-load (POL) supplies of 3 A, 5 A and 8 A, respectively. The devices are designed to provide a wide 5 V to 40 V 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. These devices deliver power to a wide range of industrial and networking equipment typically powered by well regulated 24 VDC, classical telecom 18 V to 36 V or 24 VAC supplies.
With a proprietary emulated current mode COT control scheme, the XR76203, XR76205 and XR76208 provide extremely fast line and load transient response using ceramic output capacitors. They require no loop compensation, simplifying circuit implementation and reducing overall component count. The control loop also provides 0.07% load and 0.15% line regulation and maintains constant operating frequency. A selectable power saving mode allows the user to operate in discontinuous mode (DCM) at light current loads, significantly increasing the converter efficiency. A host of protection features, including overcurrent, over-temperature, short-circuit and UVLO, helps achieve safe operation under abnormal operating conditions.
The XR76203, XR76205 and XR76208 are available in RoHS compliant, green/halogen free, space-saving 30-pin 5mm x 5mm QFN packages. The XR76203, XR76205 and XR76208 are priced at $1.85, $2.30 and $2.90, respectively in 1,000-piece quantities. For more information, visit.
Summary of features:
- Integrated controller, drivers, bootstrap diode and MOSFETs
- Wide 5 V to 40 V input voltage range
- Patented constant on-time control
- Stable with ceramic output capacitors
- Exceptional line/load regulation
