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LM2577S-15 |LM2577S15N/a10avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577S-15 |LM2577S15NSN/a291avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577SADJNSN/a1760avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577N-15 |LM2577N15NSN/a20avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577N-ADJ |LM2577NADJNSN/a51avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577S-12 |LM2577S12N/a67avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577M-12 |LM2577M12NSN/a1005avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577M-15 |LM2577M15NSN/a1937avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577M-ADJ |LM2577MADJNSN/a7422avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577MX-12 |LM2577MX12NSN/a552avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577MX-15 |LM2577MX15NSN/a1300avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577MX-ADJ |LM2577MXADJNSN/a7422avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577N-12 |LM2577N12NSN/a98avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577N-12 |LM2577N12NSCN/a250avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577S-ADJ |LM2577SADJNSN/a1407avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577SX-15 |LM2577SX15NSN/a500avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577SX-ADJ |LM2577SXADJNS,NSN/a500avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577T-12 |LM2577T12N/a28avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577T-15 |LM2577T15NSN/a159avaiSIMPLE SWITCHER Step-Up Voltage Regulator
LM2577T-ADJ |LM2577TADJNSCN/a90avaiSIMPLE SWITCHER Step-Up Voltage Regulator


LM2577MX-12 ,SIMPLE SWITCHER Step-Up Voltage Regulatorfeatures include a 52 kHzn Flyback and forward regulatorsfixed-frequency oscillator that requires n ..
LM2577MX-15 ,SIMPLE SWITCHER Step-Up Voltage Regulatorfeatures include a 52 kHzn Flyback and forward regulatorsfixed-frequency oscillator that requires n ..
LM2577MX-ADJ ,SIMPLE SWITCHER Step-Up Voltage RegulatorElectrical Characteristics— LM1577-12, LM2577-12=Specifications with standard type face are for T 2 ..
LM2577N-12 ,SIMPLE SWITCHER Step-Up Voltage RegulatorElectrical Characteristics— LM1577-12, LM2577-12=Specifications with standard type face are for T 2 ..
LM2577N-12 ,SIMPLE SWITCHER Step-Up Voltage RegulatorFeaturesn Requires few external componentsThe LM1577/LM2577 are monolithic integrated circuits that ..
LM2577N-15 ,SIMPLE SWITCHER Step-Up Voltage RegulatorElectrical Characteristics— LM1577-12, LM2577-12 (Continued)=Specifications with standard type face ..
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LM2577M-12-LM2577M-15-LM2577M-ADJ-LM2577MX-12-LM2577MX-15-LM2577MX-ADJ-LM2577N-12-LM2577N-15-LM2577N-ADJ-LM2577S-12-LM2577S-15-LM2577SADJ-LM2577S-ADJ-LM2577SX-15-LM2577SX-ADJ-LM2577T-12-LM2577T-15-LM2577T-ADJ
SIMPLE SWITCHER Step-Up Voltage Regulator
LM1577/LM2577 Series
SIMPLE SWITCHER® Step-Up Voltage Regulator
General Description

The LM1577/LM2577are monolithic integrated circuitsthat
provideallofthe power and control functionsfor step-up
(boost), flyback,and forward converter switching regulators.
The deviceis availablein three different output voltagever-
sions: 12V, 15V,and adjustable.
Requiringa minimum numberof externalcomponents, these
regulatorsare cost effective,and simpleto use. Listedinthis
data sheetarea familyof standard inductors and flyback
transformers designedto work with these switching regula-
tors.
Includedonthe chipisa 3.0A NPN switchandits associated
protection circuitry, consisting ofcurrent andthermallimiting,
and undervoltage lockout. Other features includea52 kHz
fixed-frequency oscillatorthat requiresno external compo-
nents,asoft start modeto reduce in-rush current during
start-up,and current mode controlfor improved rejectionof
input voltageand output load transients.
Features
Requiresfew external components NPN output switches 3.0A,can standoff 65V Wide input voltage range: 3.5Vto 40V Current-mode operationfor improved transient
response,line regulation,and currentlimit52 kHz internal oscillator Soft-start function reduces in-rush current during start-up Output switch protectedby current limit, under-voltage
lockout,and thermal shutdown
Typical Applications
Simple boost regulator Flybackand forward regulators Multiple-output regulator
Typical Application
Ordering Information
Temperature
Range
Package
Type
Output Voltage NSC
12V 15V ADJ Package Package
Drawing

−40˚C≤TA≤ +125˚C 24-Pin Surface Mount LM2577M-12 LM2577M-15 LM2577M-ADJ M24B SO
16-Pin MoldedDIP LM2577N-12 LM2577N-15 LM2577N-ADJ N16A N
5-Lead Surface Mount LM2577S-12 LM2577S-15 LM2577S-ADJ TS5B TO-263
5-Straight Leads LM2577T-12 LM2577T-15 LM2577T-ADJ T05A TO-220
5-Bent Staggered LM2577T-12 LM2577T-15 LM2577T-ADJ T05D TO-220
Leads Flow LB03 Flow LB03 Flow LB03
−55˚C≤TA≤ +150˚C 4-Pin TO-3 LM1577K-12/883 LM1577K-15/883 LM1577K-
ADJ/883
K04A TO-3
SIMPLESWITCHER®isaregistered trademarkofNationalSemiconductor Corporation.
DS011468-1
Note:
Pin numbers shownarefor TO-220(T) package.
June 1999
LM1577/LM2577
Series
SIMPLE
SWITCHER
Step-Up
oltage
Regulator

©1999 National Semiconductor Corporation DS011468
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