System Controls
Power delivery and system controls functions ensure electronic systems and equipments operate at the anticipated performance level and within the required safety margins. While stable voltage references guarantee accurate power generation, system supervisors monitor one or several voltage rails for abnormal operations. Power switches are key elements of power distribution providing on/off functionalities along ensuring over current protection for the equipment and peripheral systems.
Exar Corporation offers a broad range of USB VBUS power distribution switches supporting both the USB 2.0 and latest USB 3.0 specifications. These devices, the SP/XRP252x series, are offered in single and dual channels configuration for maximum design flexibility. The XRP2527 and XRP2528 are generic single and dual channels power distribution switches capable of operating at input voltage as low as 1.8V supporting the typical 1.8V, 2.5V, 3.3V and 5V power rails. Current limit for each channel is programmable from 300mA up to 1A through an external resistor and achieves better than 8% accuracy.
Precision adjustable shunt regulators provide a highly stable voltage reference as low as 1.24V. The XRP431L, a temperature compensated 1.24V to 18V precise adjustable shunt regulator with better than 0.5% accuracy, is offered in a space saving SOT23 package and only requires a mere 100µA to operate.