LM2731 Datasheet | National Semiconductor

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 k Hz (“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 pensation simplifies design and reduces ponent 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 pensated Applications n n n n n White LED Current Source PDA’s and Palm-Top puters Digital Cameras Portable Phones and Games Local Boost Regulator Typical Application Circuit © 2003 National Semiconductor Corporation DS200591 .national. Typical Application Circuit (Continued) White LED Flash Application .national. Connection Diagram Top View 5-Lead SOT-23 Package See NS Package Number MF05A Ordering Information Order Number Package Type Package Drawing LM2731XMF LM2731XMFX LM2731YMF LM2731YMFX SOT23-5 MF05A Supplied As 1K Tape and Reel 3K Tape and Reel 1K Tape and Reel 3K Tape and Reel Package ID S51A S51A S51B S51B Pin Description Pin 1 2 3 4 5 Name SW GND...