500_kHz_5_V_TO_12_V_400_mA_DC_TO_DC_CONVERTER

Published:2009/7/13 2:14:00 Author:May | From:SeekIC

In some 5-V-only systems, it is necessary to generate a local 12-V supply to power op amps, data-acquisition circuitry, or devices, such as small motors. The LT1372 is a 500-kHz high-efftciency switching power regulator that provides this capability, as shown in this circuit. The 500-kHz switching frequency reduces the size of the magnetics significantly over that in lower-frequency designs; they consume just 0.5 in2 oftotal board space. The internal switches are current-limited to 1.5 A. In addition, the quiescent current gf LT1372 is just 4 mA, which, along with very low switch losses, provides up to 89 percent efficiency in this application. Other features of the LT1372 include synchronization of the switching action to a system clock source and shutdown capability, reducing supply currents to just 12 μA. Also, the LT1372 has two feedback inputs that allow regulation of either positive or negative output voltages.



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