Datasheet
Package Availability, Models, Samples & Pricing
General 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 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 50kHz 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 shutdown
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.
Design Tools
Application Notes
[Information as of 29-Aug-2008]
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RoHS Compliance Information
