Design Note 91: 5V to 3.3V Circuit Collection
The LTC1174-3.3 current mode DC/DC converter provides efficiencies better than 90% over a wide load current range while requiring only 1μA in Shutdown.
Figure 1. High Efficiency 3.3V Regulator.
The LT1121-3.3 low dropout linear regulator provides up to 150mA output current with 30μA quiescent current.
Figure 2. 3.3V Battery-Powered Supply with Shutdown.
The LT1129-3.3 low dropout linear regulator provides more output current (to 700mA) with only a slight increase in quiescent current (50μA).
Figure 3. 3.3V Supply with Shutdown.
Linear regulator circuits provide simple solutions with superior transient performance for desktop resident Pentium processor-based systems.
Figure 4. LT1585 Linear Regulator Optimized for Desktop Pentium Processor Applications.
This circuit achieves >90% efficiency using an LTC1148 synchronous switching regulator which consumes a mere 180μA quiescent current.
Figure 5. LTC1148 5V to 3.38V Pentium Power Solution 3.5A Output Current.
The LTC1266 drives N-channel MOSFETs directly and provides 7A output current at efficiencies greater than 90%.
Figure 6. LTC1266 Switching Regulator Converts 5V to 3.38V at 7A for Pentium and Other High Speed μPs.
LTC1266 Switching Regulator Converts 5V to 3.38V at 7A for Pentium and Other High Speed μPs.
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