FT441 Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 1.5MHz, 900mA Synchronous Step-Down Converter

Fremont Micro Devices
FT441
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.
www.fremontmicro.com
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