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FT441 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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FT441 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 10 page  Fremont Micro Devices FT441 www.fremontmicro.com Page 1 of 10 DS441-A2 1.5MHz, 900mA Synchronous Step-Down Converter FEATURES High Efficiency - Up to 95% Guaranteed 900mA Output Current 2.5V to 5.5V Input Voltage Range 1.5MHz Constant Frequency Operation No external Schottky Diode Needed Adjustable Output Voltages From 0.6V to VIN Fixed Output Voltage Options Available 100% Duty Cycle Low-Dropout Operation 0.1μA Shutdown Current SOT23-5 Package TYPICAL APPLICATIONS Cellular phones DSP Core Supplies XDSL Applications USB Powered Modems Digital Still Cameras Portable Instruments PC Cards and Notebooks DESCRIPTION The FT441 is a 1.5MHz constant frequency, slope compensated current mode step down converter. It is ideal for portable equipment requiring very high current up to 0.9A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The FT441 integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The FT441 automatically turns off the synchronous rectifier to increase efficiency while enters discontinuous PWM mode. The FT441 can run at 100% duty cycle for low dropout operation, maximizing battery life in portable application. FT441 consumes less than 1uA when enter shutdown mode. The FT441 is available in a fixed output voltages of 1.2V, 1.5V, and 1.8V, and is also available in an adjustable output voltage version capable of generating output voltages from 0.6V to VIN .The FT441 is available in a 5-pin SOT23-5 package. |
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