LM2623AMM/NOPB

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 KHz 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).

Applications

• Cameras, Pagers and Cell Phones
• PDAs, Palmtop Computers, 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

Key features

• 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