The LM3478Q-Q1 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 LM3478Q-Q1 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478Q-Q1 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 LM3478Q-Q1 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.
| Documentación principal | Tipo | Título | Opciones de formato | Fecha |
|---|---|---|---|---|
| * | Data sheet | LM3478Q-Q1 High-Efficiency Controller for Boost, SEPIC and Flyback DC-DC Converters datasheet (Rev. A) | PDF | HTML | 02 jun 2025 |
| Application brief | Avoiding Pulse Skip Operation at Light Load Conditions for Asynchronous Boost Converter Designs | PDF | HTML | 16 sep 2025 |
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This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| VSSOP (DGK) | 8 | Ultra Librarian |
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The LM3478-88 quick start calculator for SEPIC tool supports the initial calculation of the SEPIC power stage and of the necessary external components for a SEPIC converter using LM3478 or LM3488 as regulation IC.
The LM3478-88 quick start calculator for boost tool supports the initial calculation of the boost power stage and of the necessary external components for a boost converter using LM3478 or LM3488 as regulation IC.
Version 1.1.0
The LM3478-88 quick start calculator for Flyback topology supports the initial calculation of the power stage and of the necessary external components for a Flyback converter using LM3478 or LM3488 as regulation IC.