LM3478MMX Datasheet

High Efficiency Low-Side N-Channel Controller for Switching Regulator


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.

• LM3478Q in VSSOP-8 package is AEC-Q100 qualified and manufactured on an Automotive Grade Flow
• 8-lead VSSOP-8 and SOIC-8 packages
• Internal push-pull driver with 1A peak current capability
• Current limit and thermal shutdown
• Frequency compensation optimized with a capacitor and a resistor
• Internal soft start
• Current Mode Operation
• Undervoltage Lockout with hysteresis

• Distributed Power Systems
• Battery Chargers
• Offline Power Supplies
• Telecom Power Supplies
• Automotive Power Systems

• 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)



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Manufacturer information


Texas Instruments introduction - Texas Instruments Incorporated (TI) is a global semiconductor design and manufacturing company that develops analog ICs and embedded processors. By employing the world's brightest minds, TI creates innovations that shape the future of technology. TI is helping more than 100,000 customers transform the future, today.

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