LM2678 SIMPLE SWITCHER 8V to 40V, 5A High Efficiency Step-Down DC/DC Switching Regulator | TI.com

LM2678 (ACTIVE)

SIMPLE SWITCHER 8V to 40V, 5A High Efficiency Step-Down DC/DC Switching Regulator

 

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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 5-A 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 3.3 V, 5 V, and 12 V and an adjustable output version.

The SIMPLE SWITCHER® concept provides for a complete design using a minimum number of external components. A high fixed frequency oscillator (260 kHz) 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/OFF control input that can power down the regulator to a low 50-µA quiescent current standby condition. The output voltage is ensured to a ±2% tolerance. The clock frequency is controlled to within a ±11% tolerance.

Features

  • Efficiency Up to 92%
  • Simple and Easy to Design Using Off-the-Shelf External Components
  • 120-mΩ DMOS Output Switch
  • 3.3-V, 5-V, and 12-V Fixed Output and Adjustable (1.2 V to 37 V) Versions
  • 50-µA Standby Current When Switched OFF
  • ±2% Maximum Output Tolerance Over Full Line and Load Conditions
  • Wide Input Voltage Range: 8 V to 40 V
  • 260-kHz Fixed Frequency Internal Oscillator
  • –40 to 125°C Operating Junction Temperature Range
  • Create a Custom Design Using the LM2678 With the WEBENCH® Power Designer

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Parametrics Compare all products in Buck converters (integrated switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated outputs (#)
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Control mode
Duty cycle (Max) (%)
Operating temperature range (C)
Rating
Package Group
Type
Package size: mm2:W x L (PKG)
LM2678
8    
40    
1.23    
37    
5    
1    
260    
260    
4.2    
Frequency Synchronization
Over Current Protection    
Voltage Mode    
91    
-40 to 125    
Catalog    
DDPAK/TO-263 | 7
TO-220 | 7
VSON | 14    
Converter    
7DDPAK/TO-263: 154 mm2: 15.24 x 10.1 (DDPAK/TO-263 | 7)
See datasheet (TO-220)
14VSON: 30 mm2: 5 x 6 (VSON | 14)    

Design tool

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM2678

  Min   Max Range
Vin  V 8.0 to 40.0V
Vout  V 1.21 to 40V
Iout  A ≤ 5A
Ambient Temp  °C -40 to 125°C