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LM2623MMX Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM2623MMX Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 11 page LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter General Description The LM2623 is a high efficiency, general purpose, step-up DC-DC switching regulator for battery-powered and low in- put 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 regu- lation mode to produce good efficiency and stable operation over a wide operating range. It normally regulates by skip- ping 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 Pro- cedure 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. Features n Good Efficiency Over a Very Wide Load Range n Very Low Output Voltage Ripple n Small, Mini-SO-8 Package (Half the Footprint of Standard 8 pin SO Package) n 1.09 mm Package Height n Up to 2 MHz Switching Frequency n .8V to 14V Operating Voltage n 1.1V Start-up Voltage n 1.24V - 14V Adjustable Output Voltage n Up to 2A Load Current at low Output Voltages n 0.17 Ω Internal MOSFET n Up to 90% Regulator Efficiency n 80 µA Typical Operating Current (into V DD pin of supply) n < 2.5µA Guaranteed Supply Current In Shutdown n 4mm x 4mm Thermally Enhanced LLP Package Option Applications n Cameras, Pagers and Cell Phones n PDAs,Palmtop Computers, GPS devices n White LED Drive, TFT or Scanned LCDs n Flash Memory Programming n Hand-Held Instruments n 1, 2, 3 or 4 Cell Alkaline Systems n 1, 2 or 3 Cell Lithium-ion Systems Typical Application Circuit 20038801 January 2004 © 2004 National Semiconductor Corporation DS200388 www.national.com |
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