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LM2574N-3.3 ,0.5A, Adjustable Output Voltage, Step-Down Switching RegulatorLM2574/LM2574HV SIMPLE SWITCHER 0.5A Step-Down Voltage RegulatorJune 1999LM2574/LM2574HV™SIMPLE SWI ..
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LM2574HVM-1.2-LM2574HVM-1.5-LM2574HVM-12-LM2574HVM-15-LM2574HVM-3.3-LM2574HVM-5.0-LM2574HVM-ADJ-LM2574HVMX-15-LM2574HVMX-3.3-LM2574HVMX-5.0-LM2574HVN-12-LM2574HVN-15-LM2574HVN-3.3-LM2574HVN-5.0-LM2574HVN-ADJ-LM2574M-12-LM2574M-15-LM2574M-3.3-LM2574M-5.0-LM2574M-ADJ-
SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
LM2574/LM2574HV
SIMPLE SWITCHER™ 0.5A Step-Down Voltage Regulator
General DescriptionThe LM2574 seriesof regulatorsare monolithic integrated
circuitsthat provideallthe active functionsfora step-down
(buck) switching regulator, capableof drivinga 0.5A load
with excellentline and load regulation. These devicesare
availablein fixed output voltagesof 3.3V,5V, 12V, 15V,and adjustable output version.
Requiringa minimum numberof externalcomponents, these
regulatorsare simpletouseand include internal frequency
compensationanda fixed-frequency oscillator.
The LM2574 series offersa high-efficiency replacementfor
popular three-terminal linear regulators. Becauseofits high
efficiency,the copper tracesonthe printed circuit boardare
normallythe only heat sinking needed. standard seriesof inductors optimizedforuse withthe
LM2574are available from several different manufacturers.
This feature greatly simplifiesthe designof switch-mode
power supplies.
Other features includea guaranteed ±4% toleranceonout-
put voltage within specified input voltages and output load
conditions,and ±10%onthe oscillator frequency. External
shutdownis included, featuring50 μA(typical) standbycur-
rent.The output switch includes cycle-by-cycle current limit-
ing,as wellas thermal shutdownforfull protection under
fault conditions.
Features 3.3V,5V, 12V, 15V,and adjustable output versions Adjustable version output voltage range, 1.23Vto37V
(57VforHV version) ±4% max overlineand load
conditions Guaranteed 0.5A output current Wide input voltage range, 40V,upto 60VforHV version Requires only4 external components52 kHz fixed frequency internal oscillator TTL shutdown capability,low power standby mode High efficiency Uses readily available standard inductors Thermal shutdownand currentlimit protection
Applications Simple high-efficiency step-down (buck) regulator Efficient pre-regulatorfor linear regulators On-card switching regulators Positiveto negative converter (Buck-Boost)
Typical Application (Fixed Output Voltage Versions)
Patent Pending
SIMPLESWITCHER™isa trademarkofNationalSemiconductor Corporation
DS011394-1
Note:Pin numbersarefor8-pinDIP package.
June 1999
LM2574/LM2574HV
SIMPLE
SWITCHER
0.5A
Step-Down
oltage
Regulator©1999 National Semiconductor Corporation DS011394
