Features
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22V DMOS FET switch
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1.6 MHz (“X”), 0.6 MHz (“Y”) switching frequency
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Low RDS(ON) DMOS FET
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Switch current up to 1.8A
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Wide input voltage range (2.7V–14V)
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Low shutdown current (<1 µA)
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5-Lead SOT-23 package
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Uses tiny capacitors and inductors
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Cycle-by-cycle current limiting
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Internally compensated
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General Description
The LM2731 switching regulators are current-mode boost converters operating at fixed frequencies of 1.6 MHz (“X” option) and
600 kHz (“Y” option).
The use of SOT-23 package, made possible by the minimal power loss of the internal 1.8A switch, and use of small inductors
and capacitors result in the industry's highest power density. More...
Applications
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White LED Current Source
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PDA’s and Palm-Top Computers
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Digital Cameras
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Portable Phones and Games
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Local Boost Regulator
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Typical Application
click for larger image
| Parameters | Values |
|---|
| Output Range |
1.23V to 22V |
| Switch Current |
1.5 Amp |
| Input Min Voltage |
2.7 Volt |
| Input Max Voltage |
14 Volt |
| Frequency Max |
600, 1600 kHz |
| Output Min |
1.23 Volt |
| Output Max |
22 Volt |
| Efficiency (peak) |
90 % |
| Sync Pin |
No |
| Adj Switch Frequency |
No |
| Frequency Min |
600, 1600 kHz |
| On/Off Pin |
Yes |
| Error Flag |
No |
| PWM Mode |
Current |
| Topology |
Boost |
| Step-Up |
Yes |
| Inverting |
No |
| Flyback |
No |
| RegType |
Switching Regulator |
| Adjustable Output |
Yes |
| Temperature Min |
-40 deg C |
| Temperature Max |
125 deg C |
| Automotive |
Yes |
| PowerWise |
No |
Typical Performance
click for larger image
| |
WEBENCH Live Simulation!
Also Recommended
| LM2733▲ | Has A 40V / 1A Internal FET SOT-23 Package |
| LM2735▲ | Increased Switch Current At 2.1A |
Additional Resources
Design Tools
Application Notes
Block Diagram
click for larger image
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RoHS Compliance Information
