LM5116

Product Folder Order Now Technical Documents Tools & Software Support & Community Reference Design LM5116 SNVS499H – FEBRUARY 2007 – REVISED JULY 2015 LM5116 Wide Range Synchronous Buck Controller 1 Features 1 Emulated Peak Current Mode Wide Operating Range Up to 100 V Low IQ Shutdown (< 10 µA) Drives Standard or Logic Level MOSFETs Robust 3.5-A Peak Gate Drive Free-run or Synchronous Operation to 1 MHz Optional Diode Emulation Mode Programmable Output from 1.215 V to 80 V Precision 1.5% Voltage Reference Programmable Current Limit Programmable Soft-Start Programmable Line Undervoltage Lockout Automatic Switch to External Bias Supply HTSSOP-20 Exposed Pad Thermal Shutdown Create a Custom Design Using the LM5116 with the WEBENCH Power Designer 2 Applications Automotive Infotainment Industrial DC-DC Motor Drivers Automotive USB Adapters Telecom Servers 3 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-bycycle 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 ...