LM25116

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM25116 SNVS509E – APRIL 2007 – REVISED SEPTEMBER 2016 LM25116 Wide-Range Synchronous Buck Controller 1 Features 1 Emulated Peak Current Mode Wide Operating Range (Up to 42 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 36 V Precision 1.5% Voltage Reference Programmable Current Limit Programmable Soft Start Programmable Line Undervoltage Lockout Automatic Switch to External Bias Supply 20-Pin HTSSOP Exposed Pad Thermal Shutdown 2 Applications Automotive Infotainment Industrial DC-DC Motor Drivers Automotive USB Adapters Telecom Servers 3 Description The LM25116 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 using an emulated current ramp. Current mode control provides inherent line feedforward, 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 is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-s...