ABLIC Inc. DC DC Switching Controllers S-8521B15MC-ATAT2U

The S-8521B15MC-ATAT2U is a step-down switching regulator controller from the S-8520/8521 series by Quarktwin Technology Ltd. It features PWM/ PFM switching control, allowing for efficient operation under varying load conditions. The input voltage range is from 2.5 V to 16 V, with an output voltage that can be selected between 1.5 V and 6.0 V in 0.1 V increments. The device has a low current consumption of 60 µA during operation and only 0.5 µA during shutdown, making it suitable for battery-powered applications. The S-8521 series operates with a duty ratio of 25% to 100% in PWM mode and can switch to PFM mode under light load conditions. It includes a soft-start function to prevent overshoot at startup and has built-in overload protection. The package is compact, in SOT-23-5 form, which is advantageous for space-constrained designs. This controller is ideal for applications such as on-board power supplies for mobile devices, audio equipment, and microcomputers.