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LM2731 Datasheet(PDF) 1 Page - Texas Instruments |
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LM2731 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 22 page Efficiency vs Load Current LOAD CURRENT (mA) 3.3 -5V Boost ^z_ s Œ•]}v 0 200 400 600 800 70 80 90 100 LM2731 ³<´ SW FB GND VIN SHDN U1 R3 51K SHDN GND 3.3 VIN C1 2.2PF R2 13.3K CF 470pF D1 MBR0520 R1/40.5K L1/6.8PH C2 22PF 5V OUT 700mA (TYP) Efficiency vs Load Current LOAD CURRENT (mA) 0 100 200 300 400 70 80 90 100 LM2731 ³;´ SW FB GND VIN SHDN U1 R3 51K SHDN GND 5 VIN C1 2.2PF R2 13.3K CF 220pF D1 MBR0520 R1/117K L1/10PH C2 4.7PF 12V OUT 500mA (TYP) 500 5 - 12V Boost ^y_ s Œ•]}v LM2731 www.ti.com SNVS217E – MAY 2004 – REVISED APRIL 2010 LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23 Check for Samples: LM2731 1 FEATURES • Cycle-by-cycle current limiting • Internally compensated 2 • 22V DMOS FET switch • 1.6 MHz (“X”), 0.6 MHz (“Y”) switching APPLICATIONS frequency • White LED Current Source • Low RDS(ON) DMOS FET • PDA’s and Palm-Top Computers • Switch current up to 1.8A • Digital Cameras • Wide input voltage range (2.7V–14V) • Portable Phones and Games • Low shutdown current (<1 µA) • Local Boost Regulator • 5-Lead SOT-23 package • Uses tiny capacitors and inductors 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. Table 1. Switch Frequency X Y 1.6 MHz 0.6 MHz Typical Application Circuit 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2004–2010, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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