LM2731

LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 July 2003 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” option) 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 inductors and capacitors result in the industry’s highest power density. The 22V internal switch makes these solutions perfect 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 design and reduces component count. Switch Frequency X 1.6 MHz Y 0.6 MHz Features n n n n n n n n n n 22V DMOS FET switch 1.6 MHz (“X”), 0.6 MHz (“Y”) switching frequency Low RDS(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 n n n n n White LED Current Source PDA’s and Palm-Top Computers Digital Cameras Portable Phones and Games Local Boost Regulator Typical Application Circuit 20059110 20059130 © 2003 National Semiconductor Corporation DS200591 www.national.com LM...