The LM5141 is a synchronous buck controller, intended for high voltage wide
VIN step-down converter applications. The control method is peak current
mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current
limiting, and ease of loop compensation. The LM5141 features slew rate control to simplify the
compliance with EMI requirements.
The LM5141 has two selectable switching frequencies: 2.2 MHz and 440 kHz. Gate Drivers
with Slew Rate Control that can be adjusted to reduce EMI.
In light or no-load conditions, the LM5141 operates in skip cycle mode for improved low
power efficiency. The LM5141 has a high voltage bias regulator with automatic switch-over to an
external bias to reduce the IQ current from VIN.
Additional features include frequency synchronization, cycle-by-cycle current limit, hiccup mode
fault protection for sustained overload, and power good output.
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