LM25117

Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM25117, LM25117-Q1 SNVS714F – APRIL 2011 – REVISED AUGUST 2015 LM25117/Q1 Wide Input Range Synchronous Buck Controller With Analog Current Monitor 1 Features 1 LM25117-Q1 is Qualified for Automotive Applications AEC-Q100 Qualified With the Following Results: – Device Temperature Grade 1: -40°C to 125°C Ambient Operating Temperature Range Emulated Peak Current Mode Control Wide Operating Range from 4.5 V to 42 V Robust 3.3 A Peak Gate Drives Adaptive Dead-time Output Driver Control Free-run or Synchronizable Clock up to 750 kHz Optional Diode Emulation Mode Programmable Output from 0.8 V Precision 1.5% Voltage Reference Analog Current Monitor Programmable Current Limit Hiccup Mode Over Current Protection Programmable Soft-start and Tracking Programmable Line Undervoltage Lockout Programmable Switch-over to External Bias Supply Thermal Shutdown 2 Applications Automotive Infotainment Industrial DC-DC Motor Drivers Automotive USB Power Telecom Server 3 Description The LM25117 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 re...