40 V COT Controller Delivers 0.008%/V Line Regulation

The XR75100 from Exar Corp. is a 40 V Synchronous Step-Down Controller switching controller that supports point-of-load (POL) supplies from industrial 24 Vdc and 24 Vac rectified sources.  The patented emulated current mode Constant On-Time (COT) control scheme provides the fast transient response of conventional COT controllers without any of the compromises. This device delivers core voltage rails for ASICs, FPGAs, DSPs and other various processors in Medical, Automotive, Instrumentation and a wide range of other industrial markets.

The XR75100 with exceptional 0.008%/V line regulation across the entire input voltage range and 1% output accuracy over full temperature range provides increased headroom to engineers for easier design implementations.  Exar's COT control loop enables operation with ceramic output capacitors, eliminating loop compensation and reducing overall component count for ease of system design.  The XR75100 is specified with a wide input voltage range of 5 V to 40 V and delivers an adjustable output voltage from 0.6 V to 30 V. Additionally, the device offers a host of supervisory and protection features for proper sequencing, safe operation under abnormal operating conditions and light load operation.

The XR75100 is available now in a RoHS compliant, green/halogen free space-saving 16-pin 3x3 QFN package and is priced from $1.59 in 1000 piece quantities.