LM25119PSQE/NOPB

DC/DC контроллер, токовый режим, 4.5В до 42В, 2 выхода, синхронный понижающий, 750кГц, LLP-32.

The LM25119PSQE/NOPB is a dual Synchronous Buck Controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current-mode control utilizing an emulated current ramp. current-mode control provides inherent line feed-forward, cycle-by- cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 to 750kHz. The LM25119 drives external high-side and low-side NMOS power switches with adaptive dead- time control. User-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency.