1 Features
1• 40-V DMOS FET switch
• 1.6-MHz (“X”), 0.6 MHz (“Y”) Switching frequency
• Low RDS(ON) DMOS FET
• Switch current up to 1 A
• Wide input voltage 2.7 V to 14 V
• Low shutdown current (< 1 μA)
• 5-Pin SOT-23 package
• Uses tiny capacitors and inductors
• Cycle-by-cycle current limiting
• Internally compensated

2 Applications
• White LED current source
• PDAs and palm-top computers
• Digital cameras
• Portable phones and games
• Local boost regulator

3 Description
The LM2733 switching regulators are current-mode
boost converters operating fixed frequency 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-A switch and use
of small inductors and capacitors, results in the
industry's highest power density. The 40-V internal
switch makes these solutions perfect for boosting to
voltages of 16 V or greater.
These parts have a logic-level shutdown pin that can
be used to reduce quiescent current and extend
battery life.
Protection is provided through cycle-by-cycle current
limiting and thermal shutdown. Internal compensation
simplifies design and reduces component count.