The OB2538AP is an adjustable step-down interpolator switch-mode power supply controller manufactured by On-Bright. It is a RoHS-compliant, 8-Pin DIP switch with a range of features that make it suitable for regulating and controlling the power supply of many types of applications. The OB2538AP has a wide 4.5V to 28V input voltage range and a 0.4V reference voltage that help provide accurate output power levels and better EMI performance. In addition, this switch-mode power supply controller offers built-in overvoltage protection and programmable current limit protection to ensure stable output current. Other features include a fast transient response, low standby current consumption, and width modulation capabilities. This product is designed to provide efficient operation and reduce system cost compared to linear regulators.