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LM2678S-5.0/NOPB |LM2678S50NOPBNSN/a220avaiSIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-DDPAK/TO-263 -40 to 125
LM2678SX-5.0/NOPB |LM2678SX50NOPB进口原装N/a30avaiSIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-DDPAK/TO-263 -40 to 125
LM2678SX-5.0/NOPB |LM2678SX50NOPBN/AN/a50avaiSIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-DDPAK/TO-263 -40 to 125
LM2678SX-5.0/NOPB |LM2678SX50NOPBNSN/a10avaiSIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-DDPAK/TO-263 -40 to 125
LM2678SX-5.0/NOPB |LM2678SX50NOPBNSCN/a2000avaiSIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-DDPAK/TO-263 -40 to 125
LM2678T-ADJ/NOPB |LM2678TADJNOPBNSCN/a8000avaiSIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-TO-220 -40 to 125


LM2678T-ADJ/NOPB ,SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-TO-220 -40 to 125Block Diagram... 104 Revision HistoryNOTE: Page numbers for previous revisions may differ from page ..
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LM2678S-5.0/NOPB-LM2678SX-5.0/NOPB-LM2678T-ADJ/NOPB
SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-DDPAK/TO-263 -40 to 125
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LM2678

SNVS029K –MARCH 2000–REVISED FEBRUARY 2017
LM2678 SIMPLE SWITCHER® High Efficiency 5-A Step-Down Voltage Regulator Features
Efficiency Upto 92% Simple and Easyto Design Using Off-the-Shelf
External Components 120-mΩ DMOS Output Switch 3.3-V, 5-V, and 12-V Fixed Output and Adjustable
(1.2Vto37V) Versions 50-μA Standby Current When Switched OFF ±2% Maximum Output Tolerance Over Full Line
and Load Conditions Wide Input Voltage Range:8Vto40V 260-kHz Fixed Frequency Internal Oscillator −40to 125°C Operating Junction Temperature
Range Createa Custom Design Using the LM2678 With
the WEBENCH® Power Designer Applications Simple-to-Design, High Efficiency (>90%) Step-
Down Switching Regulators Efficient System Preregulator for Linear Voltage
Regulators Battery Chargers Description
The LM2678 series of regulators are monolithic
integrated circuits which provide all of the active
functions fora step-down (buck) switching regulator
capableof driving upto 5-A loads with excellent line
and load regulation characteristics. High efficiency
(>90%)is obtained through the useofa low ON-
resistance DMOS power switch. The series consists fixed output voltagesof 3.3V,5V, and 12V and adjustable output version.
The SIMPLE SWITCHER® concept provides fora
complete design usinga minimum numberof external
components. A high fixed frequency oscillator
(260 kHz) allows the useof physically smaller sized
components.A familyof standard inductors for use
with the LM2678 are available from several
manufacturersto 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 regulatortoa low 50- quiescent current standby condition. The output
voltageis ensuredtoa ±2% tolerance. The clock
frequencyis controlledto withina ±11% tolerance.
Device Information(1)

(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Typical Application
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