LM5117PMHX/NOPB Wide Input Range Synchronous Buck Controller HTSSOP20 spot stock

Product Descriptions

The LM5117 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 is programmable from 50 kHz to 750 kHz. The LM5117 drives external  highside 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 high voltage bias regulator that allows external  bias supply further improves efficiency. The LM5117’s unique analog telemetry feature provides average  output    current    information.    Additional features  include  thermal     shutdown,    frequency synchronization,   hiccup mode current   limit,   and adjustable line undervoltage lockout.

Product Features

•   LM5117-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 5.5 V to 65 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 Overcurrent Protection

•   Programmable Soft-Start and Tracking

•   Programmable Line Undervoltage Lockout

•   Programmable Switchover to External Bias Supply

•   Thermal Shutdown

Product Application

•   Automotive Infotainment

•   Industrial DC-DC Motor Drivers

•   Automotive USB Power

•   Telecom Server

Product Specification

Product Photo

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