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LM2825N-5.0 |LM2825N50NSN/a1969avaiIntegrated Power Supply 1A DC-DC Converter
LM2825N-ADJ |LM2825NADJNSN/a200avaiIntegrated Power Supply 1A DC-DC Converter
LM2825HN-ADJ |LM2825HNADJNSCN/a5avaiIntegrated Power Supply 1A DC-DC Converter
LM2825N-12 |LM2825N12TIN/a50avaiIntegrated Power Supply 1A DC-DC Converter
LM2825N-3.3 |LM2825N33TIN/a50avaiIntegrated Power Supply 1A DC-DC Converter


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LM2825HN-ADJ-LM2825N-12-LM2825N-3.3-LM2825N-5.0-LM2825N-ADJ
Integrated Power Supply 1A DC-DC Converter
LM2825
Integrated Power Supply 1A DC-DC Converter
General Description

The LM2825isa complete1A DC-DC Buck converter pack-
agedina 24-lead molded Dual-In-Line integrated circuit
package.
Contained withinthe packageareallthe activeand passive
componentsfora high efficiency step-down (buck) switching
regulator. Availablein fixed output voltagesof 3.3V,5Vand
12V,as wellastwo adjustable versions, these devicescan
provideupto1A ofload current withfully guaranteed electri-
cal specifications.
Self-contained, thisconverteris alsofully protectedfromout-
put fault conditions, suchas excessive load current, short
circuits,or excessive temperatures.
Highlights
No external components required (fixed output voltage
versions) Integrated circuit reliability MTBF over20 million hours Radiated EMI meets ClassB stipulatedby CISPR22 High power density,35 W/in3 24-pinDIP package profile (1.25x 0.54x 0.26 inches)
Features
Minimum design time required 3.3V,5Vand 12V fixed output versions Two adjustable versions allow 1.23Vto 15V outputs Wide input voltage range,upto 40V Low-power standby mode,IQ typically65μA High efficiency, typically 80% ±4% output voltage tolerance Excellentlineand load regulation TTL shutdown capability/programmable Soft-start Thermal shutdownand currentlimit protection −40˚Cto +85˚C ambient temperature range
Applications
Simple high-efficiency step-down (buck) regulator On-card switching regulators Efficient pre-regulatorfor linear regulators Distributed power systems DC/DC module replacement
Standard Application

(Fixed output voltage versions)
Radiated EMI

Radiated emissionof electromagnetic fieldsis measuredat
10m distance. The emission levelsare withinthe ClassB
limits stipulatedby CISPR22.
30... .230 MHz 30dB μV/m
230... .1000 MHz 37dB μV/m...10 GHz 46dB μV/m
Connection Diagram
Ordering Information
Order Number LM2825N-3.3, LM2825N-5.0, LM2825N-12,
LM2825N-ADJor LM2825HN-ADJ
SeeNS Package Number NA24F

DS012661-27
DS012661-1
DS012661-2
“NC(Donotuse)” pins:See Figure11.
Top View

May 1997
LM2825
Integrated
Power
Supply
DC-DC
Converter

©1997NationalSemiconductor Corporation DS012661
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