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LM2734 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2734 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 22 page  LM2734 Thin SOT23 1A Load Step-Down DC-DC Regulator General Description The LM2734 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23 package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regu- lation in the smallest possible PCB area. With a minimum of external components and online design support through WEBENCH™, the LM2734 is easy to use. The ability to drive 1A loads with an internal 300m Ω NMOS switch using state-of-the-art 0.5µm BiCMOS technology re- sults in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 20V input operating range down to the minimum output voltage of 0.8V. Switching frequency is internally set to 550kHz (LM2734Y) or 1.6MHz (LM2734X), allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2734 utilizes current-mode control and in- ternal compensation to provide high-performance regulation over a wide range of operating conditions. Additional fea- tures include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection. Features n Thin SOT23-6 package n 3.0V to 20V input voltage range n 0.8V to 18V output voltage range n 1A output current n 550kHz (LM2734Y) and 1.6MHz (LM2734X) switching frequencies n 300m Ω NMOS switch n 30nA shutdown current n 0.8V, 2% internal voltage reference n Internal soft-start n Current-Mode, PWM operation n WEBENCH online design tool Applications n Local Point of Load Regulation n Core Power in HDDs n Set-Top Boxes n Battery Powered Devices n USB Powered Devices n DSL Modems n Notebook Computers Typical Application Circuit Efficiency vs Load Current V IN = 5V, VOUT = 3.3V 20102301 20102345 WEBENCH™ is a trademark of Transim. October 2004 © 2004 National Semiconductor Corporation DS201023 www.national.com |
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