LINEAR_TECHNOLOGY_POWER_SOLUTIONS

Published:2009/7/13 2:49:00 Author:May | From:SeekIC

An increasing number of portable devices need 5-V-to-3.3-V converters. High efficiency at up to 1 A is needed to power 3.3-V ICs, such as power-hungry high-speed microprocessors. The LTC1265-3.3 high-efficiency switching regulator circuit shown generates up to 1 A at 3.3 V. The LTC1265-3.3 utilizes a constant OFF-time current-mode architecture for excellent line and load regulation and contains an internal P-channel power MOSFET with 0.3 Ω ON resistance, as well as a low-battery detector. The output current is user-programmable by selection of the current sense resistor Rsense according to the formula Iout = 100 mV /Rsense. Short-circuit protection is inherent in the current-iiiode architecture and limits the maximum current. The LTC1265 draws only 160 μA quiescent current under no load and just 5 μA when placed in shutdown.



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