6_TO_25_V_INPUT_5_V_125_A_DC_TO_DC_CONVERTER

Published:2009/7/13 2:33:00 Author:May | From:SeekIC

One of the keys to success for many portable devices is small size. In many cases, the requirement for a wide battery supply voltage range and high-current, regulated 5-V output seems incompatible with the size requirement. The 500-kHz LT1376, shown in this circuit, provides a powerful, compact power supply. Operating at such a high frequency permits the use of a very small 5-μH surface-mount inductor and a surface-mount output capacitor. In addition, the intemal switch has just 0.4 Ω of ON resistance, which reduces power loss and boosts efficiency to 88 percent. A special boost pin and circuitry reduces the minimum operating supply voltage in step-down applications. The maximum current rating of the switch is 1.5 A. The input voltage range extends from 6 to 25 V and is well matched for many battery-pack assemblies. The typical supply current is 4 mA, whereas the shutdown current is just 20 μA.



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