LM5116 Datasheet | National Semiconductor

Description The LM5116 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 pensation. 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 50k Hz to 1MHz. The LM5116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current sleep mode disables the controller and consumes less than 10µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle by cycle current limit and adjustable line under-voltage lockout. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation. Features - - - - - - - - - - - - - - - Emulated peak current mode Wide operating range up to 100V Low IQ sleep mode (<10µA) Drives standard or logic level MOSFETs Robust 2A peak gate drive Free-run or synchronous operation to 1MHz Optional diode emulation mode Programmable output from 1.215V to 80V Precision 1.5% voltage reference Programmable current limit Programmable soft-start Programmable line under-voltage lockout Automatic switch to external bias supply TSSOP-20EP exposed pad Thermal shutdown Typical Application © 2007 National Semiconductor Corporation .national. Connection Diagram Top View See NS Package Numbers...