500_kHz_33_V_TO_12_V_DC_CONVERTER

Published:2009/7/13 1:43:00 Author:May | From:SeekIC

The LT1309 500-kHz micropower dc-to-dc converter circuit shown provides a compact 12-V supply. High-frequency operation permits the use of low-inductance and low-capacitance values for surface-mount parts. The LT1309 provides 60 mA of output current at 12 V, required for 8-bit-wide flash memory chips. In addition, when the flash memory card is removed, the LT1309 can be shut down by the system, reducing current draw to 6 μA. A soft-start feature allows the output voltage to ramp up to 12 V over a period of time, minimizing inrush current needed from the 3.3-V supply to charge the PCMCIA input capacitance. An active-low VPP VALID output signals the system that the 12-V supply is within regulation after being switched on.



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