LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
July 2003
LM2623 General Purpose, Gated Oscillat...
LM2623 General Purpose, Gated Oscillator Based, DC/DC Boost Converter
July 2003
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 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.
Features
n Good Efficiency Over a Very Wide Load Range n Very Low Output
Voltage Ripple n Small, Mi...