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LM2678
  • LM2678
  • LM2678
  • LM2678
  • LM2678
  • LM2678

LM2678

ACTIVE

8V to 40V, 5A SIMPLE SWITCHER® buck converter with high efficiency

Texas Instruments LM2678 Product Info

1 April 2026 4

Parameters

Rating

Catalog

Topology

Buck

Iout (max) (A)

5

Vin (max) (V)

40

Vin (min) (V)

8

Vout (max) (V)

37

Vout (min) (V)

1.23

Features

Frequency synchronization, Over Current Protection

Control mode

Voltage mode

Operating temperature range (°C)

-40 to 125

Iq (typ) (A)

0.0042

Duty cycle (max) (%)

91

Package

TO-220 (NDZ)-7-82.6008 mm² 10.16 x 8.13

Features

  • Efficiency up to 92%
  • Simple and easy to design using off-the-shelf external components
  • 120mΩ DMOS output switch
  • 3.3V, 5V, and 12V fixed output and adjustable (1.2V to 37V) versions
  • 50µA standby current when switched OFF
  • ±2% maximum output tolerance over full line and load conditions
  • 8V to 40V wide input voltage range
  • 260kHz fixed frequency internal oscillator
  • −40 to 125°C operating junction temperature range
  • Create a custom design using the LM2678 with the WEBENCH Power Designer
  • Efficiency up to 92%
  • Simple and easy to design using off-the-shelf external components
  • 120mΩ DMOS output switch
  • 3.3V, 5V, and 12V fixed output and adjustable (1.2V to 37V) versions
  • 50µA standby current when switched OFF
  • ±2% maximum output tolerance over full line and load conditions
  • 8V to 40V wide input voltage range
  • 260kHz fixed frequency internal oscillator
  • −40 to 125°C operating junction temperature range
  • Create a custom design using the LM2678 with the WEBENCH Power Designer

Description

The LM2678 series of regulators are monolithic, integrated circuits, which provide all of the active functions for a step-down (buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High efficiency (>90%) is obtained through the use of a low ON-resistance DMOS power switch. The series consists of fixed output voltages of 3.3V, 5V, and 12V and an adjustable output version.

The SIMPLE SWITCHER power converter concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260kHz) allows the use of physically smaller sized components. A family of standard inductors for use with the LM2678 are available from several manufacturers to greatly simplify the design process.

The LM2678 series also has built-in thermal shutdown, current limiting, and an ON and OFF control input that can power down the regulator to a low 50µA quiescent current standby condition. The output voltage is specified to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

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