LM3478Q - High Efficiency Low-Side N-Channel Controller

Product Overview

National Semiconductor

Part number	LM3478Q
Manufacturer	National Semiconductor
File Size	456.25 KB
Description	High Efficiency Low-Side N-Channel Controller
Datasheet	LM3478Q Datasheet
Note	This datasheet PDF includes multiple part numbers: LM3478Q, LM3478. Please refer to the document for exact specifications by model.
Additional preview pages of the LM3478Q datasheet.

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.

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) Features.
LM3478Q in MSOP-8 package is.

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Published: Nov 6, 2025 |