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LM2673S-12-LM2673S-3.3-LM2673-S-5.0-LM2673S-5.0-LM2673S-ADJ-LM2673SD-12-LM2673SD-3.3-LM2673SD-5.0-LM2673SD-ADJ-LM2673SX-5.0-LM2673SX-ADJ-LM2673T-12-LM2673T-ADJ
SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current Limit
LM2673
SIMPLE SWITCHER® 3A Step-Down Voltage Regulator
with Adjustable Current Limit
General DescriptionThe LM2673 seriesof regulators are monolithic integrated
circuits which provideallof the active functionsfora step-
down (buck) switching regulator capableof drivingupto3A
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 LM2673are 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 LM2673 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 94% Simple and easyto design with (using off-the-shelf
external components) Resistor programmable peak current limit overa range2Ato 5A. 150 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 ApplicationOctober 2003
LM2673
SIMPLE
SWITCHER
Step-Down
oltage
Regulator
with
Adjustable
Current
Limit
