The LM5117PMH/NOPB is a 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 operating frequency is programmable from 50 to 750kHz. The LM5117 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 that allows external bias supply further improves efficiency.
● Emulated peak current mode control
● Robust 3.3A Peak gate drives
● Adaptive dead-time output driver control
● Optional diode emulation mode
● Programmable output from 0.8V
● Precision 1.5% Voltage reference
● Analog current monitor
● Programmable current limit
● Hiccup mode overcurrent protection
● Programmable soft-start and tracking
● Programmable line undervoltage lockout
● Programmable switchover to external bias supply
● Thermal shutdown
● Green product and no Sb/Br
●Device has limited built-in ESD protection, leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
