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LM2623 Arkusz danych(PDF) 1 Page - Texas Instruments |
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LM2623 Arkusz danych(HTML) 1 Page - Texas Instruments |
1 / 16 page LM2623 www.ti.com SNVS188G – MAY 2004 – REVISED DECEMBER 2005 LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter Check for Samples: LM2623 1 FEATURES • <2.5µA Guaranteed Supply Current In Shutdown 2 • Good Efficiency Over a Very Wide Load Range • 4mm x 4mm Thermally Enhanced LLP Package • Very Low Output Voltage Ripple Option • Small, Mini-SO-8 Package (Half the Footprint of Standard 8 pin SO Package) APPLICATIONS • 1.09 mm Package Height • Cameras, Pagers and Cell Phones • Up to 2 MHz Switching Frequency • PDAs,Palmtop Computers, GPS devices • .8V to 14V Operating Voltage • White LED Drive, TFT or Scanned LCDs • 1.1V Start-up Voltage • Flash Memory Programming • 1.24V - 14V Adjustable Output Voltage • Hand-Held Instruments • Up to 2A Load Current at low Output Voltages • 1, 2, 3 or 4 Cell Alkaline Systems • 0.17 Ω Internal MOSFET • 1, 2 or 3 Cell Lithium-ion Systems • Up to 90% Regulator Efficiency • 80 µA Typical Operating Current (into VDD pin of supply) DESCRIPTION The LM2623 is a high efficiency, general purpose, step-up DC-DC switching regulator for battery-powered and low input voltage systems. It accepts an input voltage between .8 and 14 volts and converts it into a regulated output voltage between 1.24 and 14 volts. Efficiencies up to 90% are achievable with the LM2623. In order to adapt to a number of applications, the LM2623 allows the designer to vary the output voltage, the operating frequency (300kHz to 2 MHz) and duty cycle (17% to 90%) to optimize the part's performance. The selected values can be fixed or can vary with battery voltage or input to output voltage ratio. The LM2623 uses a very simple, on/off regulation mode to produce good efficiency and stable operation over a wide operating range. It normally regulates by skipping switching cycles when it reaches the regulation limit (Pulse Frequency Modulation). Note: Please read the "Non-Linear Effect" and "Choosing The Correct C3 Capacitor" sub-sections of the Design Procedure section of this data sheet, so that any challenges with designing with this part can be taken into account before a board design/layout is finalized. For Alternative Solutions, See Also: LM2700, LM2622, LM2731, LM2733, and LM2621. 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 © 2004–2005, 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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