The SF5887SGT is a switching controller manufactured by the company Sifirst. It is an 8-pin, surface-mount SOP8 package with RoHS compliance. The device is suitable for use in boosting and buck converters. It works by taking input from the current sense resistor, and then adjusts the duty cycle through a comparison of the error amplifier output and a reference voltage input. The output is then used to drive an external MOSFET in order to regulate the output voltage. The device also comes with integrated soft-start, short-circuit protection, thermal protection, and undervoltage lock-out. Additionally, it also comes with programmable oscillator frequency, frequency synchronization, peak current limit, and overcurrent protection.