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Home ›  LL29 > LM2679S-12-LM2679S-3.3-LM2679S-5.0-LM2679S-ADJ-LM2679S-ADJ.-LM2679SD-3.3-LM2679SD-5.0-LM2679SD-ADJ-LM2679SDX-5.0-LM2679SDX-ADJ-LM2679SX-5.0-LM2679SX-ADJ-LM2679T-12-LM2679T-3.3-LM2679T-5.0-LM2679T-ADJ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
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LM2679S-12 |LM2679S12NSN/a19avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-12 |LM2679S12国半N/a1000avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-3.3 |LM2679S33NSN/a16696avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-5.0 |LM2679S50NSCN/a6540avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-ADJ |LM2679SADJNSCN/a3avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679S-ADJ. |LM2679SADJNSN/a51avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SD-3.3 |LM2679SD33NSN/a45avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SD-5.0 |LM2679SD50NSCN/a14avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SD-ADJ |LM2679SDADJNSN/a450avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SDX-5.0 |LM2679SDX50NSCN/a14avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SDX-ADJ |LM2679SDXADJNSN/a2500avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SX-5.0 |LM2679SX50NSN/a11500avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SX-ADJ |LM2679SXADJNSN/a16696avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679SX-ADJ |LM2679SXADJNATIONALSEMIN/a5000avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-12 |LM2679T12进口国半N/a6173avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-3.3 |LM2679T33NSN/a225avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-5.0 |LM2679T50NSN/a23avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-5.0 |LM2679T50国半N/a63avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-ADJ |LM2679TADJNSN/a225avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679T-ADJ |LM2679TADJNSCN/a20avaiSIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit


LM2679SX-ADJ ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitLM2679 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitOctober 2003LM26 ..
LM2679SX-ADJ ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitLM2679 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitOctober 2003LM26 ..
LM2679T-12 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitLM2679 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitOctober 2003LM26 ..
LM2679T-3.3 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limitfeatures include the ability to reduce the input surgecurrentatpower-ONbyaddingasoftstarttimingcapa ..
LM2679T-5.0 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitFeaturesn Efficiency up to 92%The LM2679 series of regulators are monolithic integratedcircuits whi ..
LM2679T-5.0 ,SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current LimitFeaturesn Efficiency up to 92%The LM2679 series of regulators are monolithic integratedcircuits whi ..
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
LM556CN ,Dual TimerMICROCIRCUIT DATA SHEETOriginal Creation Date: 08/02/95MNLM556-X REV 0BLLast Update Date: 11/12/98L ..
LM556J ,18 V, dual timerGeneral Description The LM556 Dual timing circuit is a highly stable Controller capable of prod ..
LM556J ,18 V, dual timerApplications I Precision timing I Pulse generation I Sequential timing I Time delay gen ..
LM556J-MIL ,Dual TimerLM556 Dual TimerMarch 2000LM556Dual Timer


LM2679S-12-LM2679S-3.3-LM2679S-5.0-LM2679S-ADJ-LM2679S-ADJ.-LM2679SD-3.3-LM2679SD-5.0-LM2679SD-ADJ-LM2679SDX-5.0-LM2679SDX-ADJ-LM2679SX-5.0-LM2679SX-ADJ-LM2679T-12-LM2679T-3.3-LM2679T-5.0-LM2679T-ADJ
SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
LM2679
SIMPLE SWITCHER® 5A Step-Down Voltage Regulator
with Adjustable Current Limit
General Description

The LM2679 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 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 Application

October 2003
LM2679
SIMPLE
SWITCHER
Step-Down
oltage
Regulator
with
Adjustable
Current
Limit
ic,good price


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