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LM3478Q-Q1
  • LM3478Q-Q1
  • LM3478Q-Q1
  • LM3478Q-Q1
  • LM3478Q-Q1

LM3478Q-Q1

ACTIVE

40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current

Texas Instruments LM3478Q-Q1 Product Info

1 April 2026 3

Parameters

Rating

Automotive

Topology

Boost, Flyback, Forward, SEPIC

Vin (max) (V)

40

Vin (min) (V)

2.97

Vout (max) (V)

500

Vout (min) (V)

1.26

Control mode

current mode

Features

Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Nonsynchronous rectification, Prebias startup

Duty cycle (max) (%)

100

Iq (typ) (A)

0.0027

Operating temperature range (°C)

-40 to 125

Package

VSSOP (DGK)-8-14.7 mm² 3 x 4.9

Features

  • LM3478Q-Q1 is AEC-Q100 qualified and manufactured on an automotive grade flow
  • 8-lead VSSOP-8
  • 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
  • Key specifications:
    • Wide supply voltage range of 2.97V to 40V
    • 100kHz to 1MHz adjustable clock frequency
    • ±2.5% (overtemperature) internal reference
    • 10µA shutdown current (overtemperature)
  • Create a custom design using the LM3478Q-Q1 with the WEBENCH Power Designer
  • LM3478Q-Q1 is AEC-Q100 qualified and manufactured on an automotive grade flow
  • 8-lead VSSOP-8
  • 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
  • Key specifications:
    • Wide supply voltage range of 2.97V to 40V
    • 100kHz to 1MHz adjustable clock frequency
    • ±2.5% (overtemperature) internal reference
    • 10µA shutdown current (overtemperature)
  • Create a custom design using the LM3478Q-Q1 with the WEBENCH Power Designer

Description

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.

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