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LM2574
Series SIMPLE SWITCHER 0.5A Step-Down Voltage Regulator
TL/H/11394
LM2574/LM2574HV
Series
SIMPLE
SWITCHER
0.5A
Step-Down
Voltage
Regulator
March 1995
LM2574/LM2574HV Series
SIMPLE SWITCHERTM 0.5A Step-Down Voltage Regulator
General Description
The 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 external components,
these regulatorsare simpletouseand include internalfre-
quency compensationanda fixed-frequency oscillator.
The LM2574 series offersa high-efficiency replacementfor
popular three-terminal linear regulators. Becauseofits high
efficiency,the copper tracesonthe printed circuitboardare
normallythe only heat sinking needed. standard seriesof inductors optimizedfor use withthe
LM2574are available from several different manufacturers.
This feature greatly simplifiesthe designof switch-mode
power supplies.
Otherfeatures includea guaranteed g4% tolerance onout-
put voltage within specified input voltagesand output load
conditions,and g10%onthe oscillator frequency. External
shutdownis included, featuring50mA (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,
1.23Vto 37V (57VforHV version) g4% max overline
and load conditions Guaranteed 0.5A output current Wide input voltage range, 40V,upto 60V
forHV 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 current limit 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)
TL/H/11394–1
Note: Pinnumbersarefor8-pinDIP package.
Connection Diagrams
8-LeadDIP(N)
TL/H/11394–2
Top View
14-Lead Wide
Surface Mount (WM)
TL/H/11394–3
TopView
*No internal
connection,but
shouldbe soldered PCboardfor
bestheat transfer.
Order NumberLM2574-3.3HVN, LM2574HVN-5.0,
LM2574HVN-12, LM2574HVN-15, LM2574HVN-ADJ,
LM2574N-3.3,LM2574N-5.0, LM2574N-12,
LM2574N-15or LM2574N-ADJ
SeeNS Package Number N08A Order Number LM2574HVM-3.3,LM2574HVM-5.0,
LM2574HVM-12,LM2574HVM-15,LM2574HVM-ADJ,
LM2574M-3.3LM2574M-5.0,LM2574M-12,
LM2574M-15orLM2574M-ADJ
See NSPackage Number M14B
Patent Pending
SIMPLE SWITCHERTM isatrademarkofNational SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
