The LM3478 is a versatile Low-Side N-Channel MOSFET
controller for switching regulators. It is suitable for use in
topologies requiring a low side MOSFET, such as boost, flyback,
SEPIC, etc. Moreover, the LM3478 can be operated at
extremely high switching frequency in order to reduce the
overall solution size. The switching frequency of the LM3478
can be adjusted to any value between 100kHz and 1MHz by
using a single external resistor. Current mode control provides
superior bandwidth and transient response, besides
cycle-by-cycle current limiting. Output current can be programmed
with a single external resistor.
The LM3478 has built in features such as thermal shutdown,
short-circuit protection, over voltage protection, etc. Power
saving shutdown mode reduces the total supply current to
5μA and allows power supply sequencing. Internal soft-start
limits the inrush current at start-up.
Key Specifications
■ Wide supply voltage range of 2.97V to 40V
■ 100kHz to 1MHz Adjustable clock frequency
■ ±2.5% (over temperature) internal reference
■ 10μA shutdown current (over temperature)