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LM2674
SIMPLE SWITCHER ?Power Converter High Efficiency 500 mA Step-Down Voltage Regulator
LM2674
SIMPLE SWITCHER® Power Converter High Efficiency
500 mA Step-Down V oltage Regulator
General DescriptionThe LM2674 seriesof regulators are monolithic integrated
circuits built witha LMDMOS process. These regulators
provideall the active functions fora step-down (buck)
switching regulator, capableof drivinga 500 mA load current
with excellent line and load regulation. These devices are
availablein fixed output voltagesof 3.3V, 5.0V, 12V, andan
adjustable output version.
Requiringa minimum numberof external components, these
regulators are simpleto use and include patented internal
frequency compensation (Patent Nos. 5,382,918 and
5,514,947) anda fixed frequency oscillator.
The LM2674 series operatesata switching frequencyof
260 kHz, thus allowing smaller sized filter components than
what wouldbe needed with lower frequency switching regu-
lators. Becauseofits very high efficiency (>90%),the cop-
per traceson the printed circuit board are the only heat
sinking needed. familyof standard inductorsfor use withthe LM2674 are
available from several different manufacturers. This feature
greatly simplifies the designof switch-mode power supplies
using these advanced ICs. Also includedin the datasheet
are selector guidesfor diodes and capacitors designedto
workin switch-mode power supplies.
Other features includea guaranteed ±1.5% toleranceon
output voltage within specified input voltages and output
load conditions, and ±10%on the oscillator frequency. Ex-
ternal shutdownis included, featuring typically 50 μA
stand-by current. The output switch includes current limiting, wellas thermal shutdownforfull protection under fault
conditions. simplify the LM2674 buck regulator design procedure,
there exists computer design software,
LM267X Made
Simple (version 6.0).
Features Efficiencyupto 96% Availablein SO-8, 8-pin DIP and LLP packages Computer Design Software
LM267X Made Simple(version 6.0) Simple and easyto design with Requires only5 external components Uses readily available standard inductors 3.3V, 5.0V, 12V, and adjustable output versions Adjustable version output voltage range: 1.21Vto 37V ±1.5% max output voltage tolerance over line and load
conditions Guaranteed 500mA output load current 0.25Ω DMOS Output Switch Wide input voltage range:8Vto 40V 260 kHz fixed frequency internal oscillator TTL shutdown capability, low power standby mode Thermal shutdown and current limit protection
Typical Applications Simple High Efficiency (>90%) Step-Down (Buck)
Regulator Efficient Pre-Regulatorfor Linear Regulators Positive-to-Negative Converter
Typical ApplicationMay 2001
LM2674
SIMPLE
SWITCHER
Power
Converter
High
Efficiency
Step-Down
oltage
Regulator
