Features
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Output voltage specified over temperature
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Excellent load regulation
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Guaranteed 1A output current
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Requires only one external component
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Built-in protection against excess temperature
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Short circuit protected
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General Description
The LM3940 is a 1A low dropout regulator designed to provide 3.3V from a 5V supply.
The LM3940 is ideally suited for systems which contain both 5V and 3.3V logic, with prime power provided from a 5V bus.
Because the LM3940 is a true low dropout regulator, it can hold its 3.3V output in regulation with input voltages as low as
4.5V.
The T0-220 package of the LM3940 means that in most applications the full 1A of load current can be delivered without using
an additional heatsink.
The surface mount TO-263 package uses minimum board space, and gives excellent power dissipation capability when soldered
to a copper plane on the PC board.
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Applications
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Laptop/Desktop Computers
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Logic Systems
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Typical Application
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| Parameters | Values |
|---|
| Output Current |
1000 mA |
| Output Min |
3.3 Volt |
| Input Max Voltage |
7.5 Volt |
| Dropout Voltage |
0.31 Volt |
| Adjustable Output |
No |
| Quiescent Current |
0.11 mA |
| On/Off Pin |
No |
| Error Flag |
No |
| RegType |
LDO |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Output Voltage |
3.3 Volt |
| Output Max |
3.3 Volt |
Typical Performance
click for larger image
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Also Recommended
| LM2677 | Higher Efficiency & Better Transient Response |
| LM2678 | Higher Efficiency & Better Transient Response |
| LP38690▲ | Lower Supplu Current , Stable With Ceramic Capacitor |
| LP38692▲ | Lower Quiescent Current, Stable With Ceramic Output Capacitors & Enable Pin |
| LP3872▲ | Improved Output Current, Fast Response, Lower Supply Current |
Additional Resources
Application Notes
Connection Diagram
click for larger image
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RoHS Compliance Information
