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EAGLE Library Object
|Uploaded by:||Juergen Messerer|
|Remarks:||This library is a part of the archive file m-pad-2.1.zip|
Show other files in the archive
|Download options:||Download whole archive|
( 303.9 KiB )Download original file
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( 2,969.6 KiB )
|Description:||Linear Tech's LTC1773 Synchronous Step-Down DC/DC Controller|
The LTC®1773 is a current mode synchronous buck regulator controller that drives external complementary power
MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it
suitable for 1- or 2-cell lithium-ion battery powered applications. Burst ModeTM operation provides high efficiency
at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-
The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-
noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with
an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless
of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization
or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft start is provided by
an external capacitor.
Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components
and board space.
Features: High Efficiency: Up to 95% Constant Frequency 550kHz Operation VIN from 2.65V to 8.5V VOUT from 0.8V to VIN OPTI-LOOPTM Compensation Minimizes COUT Synchronizable up to 750kHz Selectable Burst Mode Operation Low Quiescent Current: 80mA Low Dropout Operation: 100% Duty Cycle Secondary Winding Regulation Soft-Start Current Mode Operation for Excellent Line and Load Transient Response Low Shutdown IQ = 10mA ±1.5% Reference Accuracy Precision 2.5V Undervoltage Lockout Available in 10-Lead MSOP Applications: Cellular Telephones RF PA Supplies Portable Instruments Wireless MODEMS Distributed Power Systems Notebook and Palm Top Computers, PDAs Single and Dual Cell Lithium-Ion Powered Devices
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