LM2679 ,SIMPLE SWITCHER ?5A Step-Down Voltage Regulator with Adjustable Current LimitFeaturesn Efficiency up to 92%The LM2679 series of regulators are monolithic integratedcircuits whi ..
LM2679S-12 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limitfeatures include the ability to reduce the input surgecurrentatpower-ONbyaddingasoftstarttimingcapa ..
LM2679S-12 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limitfeatures include the ability to reduce the input surgecurrentatpower-ONbyaddingasoftstarttimingcapa ..
LM2679S-3.3 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitFeaturesn Efficiency up to 92%The LM2679 series of regulators are monolithic integratedcircuits whi ..
LM2679S-5.0 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitLM2679 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitOctober 2003LM26 ..
LM2679S-ADJ ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitFeaturesn Efficiency up to 92%The LM2679 series of regulators are monolithic integratedcircuits whi ..
LM555H/883 ,TimerFEATURES DESCRIPTIONThe LM555 is a highly stable device for generating2• Direct Replacement for SE5 ..
LM555J ,TimerFeaturesn Direct replacement for SE555/NE555The LM555 is a highly stable device for generating accu ..
LM555J/883 ,TimerMICROCIRCUIT DATA SHEETOriginal Creation Date: 08/02/95MJLM555-X REV 1A0Last Update Date: 03/16/01L ..
LM555J/883 ,TimerApplicationsn Precision timingn Pulse generationn Sequential timingn Time delay generationn Pulse w ..
LM556CM ,Dual TimerMICROCIRCUIT DATA SHEETOriginal Creation Date: 08/02/95MNLM556-X REV 0BLLast Update Date: 11/12/98L ..
LM556CMX ,Dual TimerLM556 Dual TimerMarch 2000LM556Dual Timer
LM2679
SIMPLE SWITCHER ?5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679
SIMPLE SWITCHER® 5A Step-Down Voltage Regulator
with Adjustable Current Limit
General DescriptionThe LM2679 seriesof regulators are monolithic integrated
circuits which provideallof the active functions fora
step-down (buck) switching regulator capableof drivingupto loads with excellent line and load regulation characteris-
tics. High efficiency (>90%)is obtained throughthe useofa
low ON-resistance DMOS power switch. The series consists fixed output voltagesof 3.3V,5V and 12V andan adjust-
able output version.
The SIMPLE SWITCHER concept providesfora complete
design usinga minimum numberof external components.A
high fixed frequency oscillator (260KHz) allows the useof
physically smaller sized components.A familyof standard
inductorsfor use withthe LM2679are available from several
manufacturersto greatly simplifythe design process.
Other features include the abilityto reduce the input surge
currentat power-ONby addinga softstart timing capacitorto
gradually turnonthe regulator. The LM2679 series also has
builtin thermal shutdown and resistor programmable current
limitof the power MOSFET switchto protectthe device and
load circuitry under fault conditions. The output voltageis
guaranteedtoa ±2% tolerance. The clock frequencyis
controlledto withina ±11% tolerance.
Features Efficiencyupto 92% Simple and easyto design with (using off-the-shelf
external components) Resistor programmable peak current limit overa range3Ato 7A. 120 mΩ DMOS output switch 3.3V,5V and 12V fixed output and adjustable (1.2Vto
37V) versions ±2%maximum output tolerance overfull line and load
conditions Wide input voltage range:8Vto 40V 260 KHz fixed frequency internal oscillator Softstart capability −40to +125˚C operating junction temperature range
Applications Simpleto design, high efficiency (>90%) step-down
switching regulators Efficient system pre-regulatorfor linear voltage
regulators Battery chargers
Typical ApplicationAugust 2002
LM2679
SIMPLE
SWITCHER
Step-Down
oltage
Regulator
with
Adjustable
Current
Limit
