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LM3940ISX-3.3/NOPB ,1A Low Dropout Regulator for 5V to 3.3V Conversion 3-DDPAK/TO-263 -40 to 125 SNVS114G–MAY 1999–REVISED FEBRUARY 20155 Pin Configuration and Functions3-Pin4-PinTO-220 PackageSO ..
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LM3940IMP-3.3/NOPB-LM3940IS-3.3/NOPB-LM3940ISX-3.3 NOPB-LM3940ISX-3.3/NOPB-LM3940ISX-3.3NOPB
1A Low Dropout Regulator for 5V to 3.3V Conversion 4-SOT-223 -40 to 125
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LM3940SNVS114G –MAY 1999–REVISED FEBRUARY 2015
LM3940 1-A Low-Dropout Regulator for 5-Vto 3.3-V Conversion Features Input Voltage Range: 4.5Vto 5.5V Output Voltage Specified over Temperature Excellent Load Regulation Specified 1-A Output Current Requires only One External Component Built-in Protection against Excess Temperature Short-Circuit Protected
Applications Laptop and Desktop Computers Logic Systems
DescriptionThe LM3940isa 1-A low-dropout regulator designed provide 3.3V froma 5-V supply.
The LM3940is ideally suited for systems which
contain both 5-V and 3.3-V logic, with prime power
provided froma 5-V bus.
Because the LM3940isa true low dropout regulator, can hold its 3.3-V outputin regulation with input
voltagesas lowas 4.5V.
The TO-220 packageof the LM3940 means thatin
most applications the full1Aof load current can be
delivered without usingan additional heatsink.
The surface mount DDPAK/TO-263 package uses
minimum board space, and gives excellent power
dissipation capability when soldered toa copper
planeon the PC board.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe datasheet.
Simplified Schematic*Requiredif regulatoris located more than1 inch fromthe power supply filter capacitororif battery poweris used.
**See Application and Implementation.
