LM2623,pdf,datasheet (General

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 Als LM2700, LM2622, LM2731, LM2733, and LM2621.