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.