The LM3481 device is a versatile Low-Side N-FET high-performance controller for switching
regulators. The device is suitable for use in topologies requiring a low-side FET, such as boost,
flyback, SEPIC, and so on. The LM3481 device can be operated at extremely high switching
frequencies to reduce the overall solution size. The switching frequency of the LM3481 device can
be adjusted to any value between 100kHz and 1MHz by using a single external resistor or by
synchronizing it to an external clock. Current mode control provides superior bandwidth and
transient response in addition to cycle-by-cycle current limiting. Current limit can be programmed
with a single external resistor.
The LM3481 device has built-in protection features such as thermal shutdown,
short-circuit protection and overvoltage protection. Power-saving shutdown mode reduces the total
supply current to 5 µA and allows power supply sequencing. Internal soft-start limits the inrush
current at start-up.
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