Texas Instruments LM3478 Low-Side MOSFET Controller IC 1A VSSOP-8

Texas Instruments LM3478 Low-Side MOSFET Controller IC is a 1A low-side N-channel MOSFET controller for switching regulator designs, supplied in a VSSOP-8 package. It suits power management designs that require precise control and built-in protection features.

Overview

The LM3478 is designed for switching regulator applications and is well suited to topologies that use a low-side MOSFET, including boost, flyback, and SEPIC converters. It can operate at switching frequencies of up to 1 MHz, which allows external inductors and capacitors to be reduced in size for a more compact overall solution.

Key Features

• The switching frequency is adjustable between 100 kHz and 1 MHz using a single external resistor.
• Current mode control architecture with cycle-by-cycle current limiting.
• The output current can be programmed using a single external resistor.
• Built-in thermal shutdown, short-circuit protection, and over-voltage protection.
• Power-saving shutdown mode that reduces total supply current to 5 µA and facilitates power supply sequencing.
• Internal soft-start function that limits inrush current at start-up.
• Internal push-pull driver with 1A peak current capability.
• Under-voltage lockout with hysteresis.
• Internal voltage reference with ±2.5% accuracy over temperature.

Dimensions and Weight

• Dimensions (W x D x H): 3.3 x 1.5 x 4.3
• Weight: 0.08 gm

Suited to boost, flyback, and SEPIC converter designs, the Texas Instruments LM3478 Low-Side MOSFET Controller IC combines adjustable switching frequency, programmable output current, and integrated protection features for switching regulator applications.