LM2731_07 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23

July 2007
LM2731
0.6/1.6 MHz Boost Converters With 22V Internal FET Switch
in SOT-23
General Description
The LM2731 switching regulators are current-mode boost
converters operating at fixed frequencies of 1.6 MHz (“X” op-
tion) 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 in-
ductors and capacitors result in the industry's highest power
density. The 22V internal switch makes these solutions per-
fect for boosting to voltages up to 20V.
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 de-
sign and reduces component count.
Switch Frequency
X
Y
1.6 MHz 0.6 MHz
Features
■ ^{22V DMOS FET switch}
■ ^{1.6 MHz (“X”), 0.6 MHz (“Y”) switching frequency}
■ ^{Low R}_DS^{(ON) DMOS FET}
■ ^{Switch current up to 1.8A}
■ ^{Wide input voltage range (2.7V–14V)}
■ ^{Low shutdown current (<1 µA)}
■ ^{5-Lead SOT-23 package}
■ ^{Uses tiny capacitors and inductors}
■ ^{Cycle-by-cycle current limiting}
■ ^{Internally compensated}
Applications
■ ^{White LED Current Source}
■ ^{PDA’s and Palm-Top Computers}
■ ^{Digital Cameras}
■ ^{Portable Phones and Games}
■ ^{Local Boost Regulator}
Typical Application Circuit
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