LM2623 Datasheet | Texas Instruments

Features - 1 Good Efficiency Over a Very Wide Load Range - Very Low Output Voltage Ripple - Up to 2-MHz Switching Frequency - 0.8-V to 14-V Operating Voltage - 1.1-V Start-up Voltage - 1.24-V to 14-V Adjustable Output Voltage - Up to 2-A Load Current at Low Output Voltages - 0.17-Ω Internal MOSFET - Up to 90% Regulator Efficiency - 80-µA Typical Operating Current (Into VDD Pin of Supply) - < 2.5-µA Ensured Supply Current In Shutdown - Small 8-Pin VSSOP Package (Half the Footprint of Standard 8-Pin SOIC Package); 1.09-mm Package Height - 4-mm × 4-mm Thermally Enhanced WSON Package Option 2 Applications - Cameras, Pagers and Cell Phones - PDAs, Palmtop puters, GPS devices - White LED Drive, TFT, or Scanned LCDs - Flash Memory Programming - Hand-Held Instruments - 1, 2, 3, or 4 Cell Alkaline Systems - 1, 2, or 3 Cell Lithium-ion Systems 3 Description The LM2623 is a high-efficiency, general-purpose, step-up DC-DC switching regulator for batterypowered and low input voltage systems. It accepts an input voltage between 0.8 V and 14 V and converts it into a regulated output voltage between 1.24 V and 14 V. 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 (300 k Hz 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: See Non-Linear Effect and Choosing The Correct C3 Capacitor 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...