LM2678T-5.0 ,SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage RegulatorFeaturesn Efficiency up to 92%The LM2678 series of regulators are monolithic integratedcircuits whi ..
LM2678T-ADJ ,SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage RegulatorLM2678 SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage RegulatorOctober 2003LM2678®SIMPLE SWIT ..
LM2678T-ADJ. ,SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage RegulatorLM2678 SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage RegulatorOctober 2003LM2678®SIMPLE SWIT ..
LM2678T-ADJ/NOPB ,SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator 7-TO-220 -40 to 125Block Diagram... 104 Revision HistoryNOTE: Page numbers for previous revisions may differ from page ..
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 ..
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
LM2678S-12-LM2678S-3.3-LM2678S-5.0-LM2678S-ADJ-LM2678S-ADJ.-LM2678SD-3.3-LM2678SD-5.0-LM2678SD-ADJ-LM2678SDX-ADJ-LM2678SX-12-LM2678SX-3.3-LM2678SX-5.0-LM2678SX-ADJ-LM2678T-12-LM2678T-12.-LM2678T-3.3-LM2678T-5.0-LM2678T-ADJ-LM2678T-ADJ.
SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
LM2678
SIMPLE SWITCHER® High Efficiency 5A Step-Down
Voltage Regulator
General DescriptionThe LM2678 seriesof regulators are monolithic integrated
circuits which provideallof the active functionsfora step-
down (buck) switching regulator capableof drivingupto5A
loads with excellent line and load regulation characteristics.
High efficiency (>90%)is obtained through the useofa low
ON-resistance DMOS power switch. The series consistsof
fixed output voltagesof 3.3V,5V and 12V andan adjustable
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 LM2678are available from several
manufacturersto greatly simplifythe design process.
The LM2678 series also has builtin thermal shutdown,
current limiting andan ON/OFF control input that can power
downthe regulatortoa low 50µA quiescent current standby
condition. The output voltageis guaranteedtoa ±2% toler-
ance. The clock frequencyis controlledto withina ±11%
tolerance.
Features Efficiencyupto 92% Simple and easyto design with (using off-the-shelf
external components) 120 mΩ DMOS output switch 3.3V,5V and 12V fixed output and adjustable (1.2Vto
37V) versions 50µA standby current when switched OFF ±2%maximum output tolerance overfull line and load
conditions Wide input voltage range:8Vto 40V 260 KHz fixed frequency internal oscillator −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 ApplicationOctober 2003
LM2678
SIMPLE
SWITCHER
High
Efficiency
Step-Down
oltage
Regulator
