LM2678
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SNVS029I –MARCH 2000–REVISED APRIL 2013
LM2678 SIMPLE SWITCHER
®
High Efficiency 5A Step-Down Voltage Regulator
Check for Samples: LM2678
1
FEATURES
DESCRIPTION
The LM2678 series of regulators are monolithic
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• Efficiency Up to 92%
integrated circuits which provide all of the active
• Simple and Easy to Design with (Using Off-
functions for a step-down (buck) switching regulator
The-Shelf External Components)
capable of driving up to 5A loads with excellent line
• 120 mΩ DMOS Output Switch
and load regulation characteristics. High efficiency
(>90%) is obtained through the use of a low ON-
• 3.3V, 5V and 12V Fixed Output and Adjustable
resistance DMOS power switch. The series consists
(1.2V to 37V ) Versions
of fixed output voltages of 3.3V, 5V and 12V and an
• 50μA Standby Current When Switched OFF
adjustable output version.
• ±2% Maximum Output Tolerance Over Full
The SIMPLE SWITCHER
®
concept provides for a
Line and Load Conditions
complete design using a minimum number of external
• Wide Input Voltage Range: 8V to 40V
components. A high fixed frequency oscillator
(260KHz) allows the use of physically smaller sized
• 260 KHz Fixed Frequency Internal Oscillator
components. A family of standard inductors for use
• −40 to +125°C Operating Junction Temperature
with the LM2678 are available from several
Range
manufacturers to greatly simplify the design process.
The LM2678 series also has built in thermal
APPLICATIONS
shutdown, current limiting and an ON/OFF control
• Simple to Design, High Efficiency (>90%) Step-
input that can power down the regulator to a low
Down Switching Regulators
50μA quiescent current standby condition. The output
voltage is ensured to a ±2% tolerance. The clock
• Efficient System Pre-Regulator for Linear
frequency is controlled to within a ±11% tolerance.
Voltage Regulators
• Battery Chargers
Typical Application
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SIMPLE SWITCHER, Switchers Made Simple are registered trademarks of Texas Instruments.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2000–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
