NJR (New Japan Radio) NJW4171 Switching Regulator ICs for buck converter are designed with an integrated highly-effective 40V/2.5A MOSFET. These ICs include two lineups, the A-version has PWM/PFM mode to ensure high-efficiency at light load and the B-version has forced PWM mode. The NJW4171 switching regulator ICs feature wide input voltage ranging from 3.4V to 40V and can correspond to supply voltage drop like cold-crank. These regulator ICs also feature a 100% maximum duty cycle to maintain a stable output voltage even if the supply voltage drops. The NJW4171 switching regulator ICs offer wide oscillating frequency ranging from 100kHz to 2.4MHz and are ideally used in automotive, infotainment, and industrial applications.