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LM2731XMF-LM2731XMFX-LM2731YMFX
0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
LM2731
0.6/1.6 MHz Boost Converters With 22V Internal FET
Switch in SOT-23
General DescriptionThe LM2731 switching regulators are current-mode boost
converters operatingat fixed frequenciesof 1.6 MHz (“X”
option) and 600 kHz (“Y” option).
The useof SOT-23 package, made possiblebythe minimal
power lossof the internal 1.8A switch, and useof small
inductors and capacitors resultin the industry’s highest
power density. The 22V internal switch makes these solu-
tions perfectfor boostingto voltagesupto 20V.
These parts havea logic-level shutdown pin that canbe
usedto reduce quiescent current and extend battery life.
Protectionis provided through cycle-by-cycle current limiting
and thermal shutdown. Internal compensation simplifies de-
sign and reduces component count.
Switch Frequency1.6 MHz 0.6 MHz
Features 22V DMOS FET switch 1.6 MHz (“X”),0.6 MHz (“Y”) switching frequency Low RDS(ON) DMOS FET Switch currentupto 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 CircuitJuly 2003
LM2731
0.6/1.6
MHz
Boost
Converters
ith
22V
Internal
FET
Switch
SOT
-23
