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LTC1772B - Constant Frequency Current Mode Step-Down DC/DC Controller

General Description

The LTC®1772B is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation.

The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772B when the input voltage falls below 2.0V.

Key Features

  • n Burst Mode® Operation Disabled for Lower Output Ripple at Light Loads n High Efficiency: Up to 94% n High Output Currents Easily Achieved n Wide VIN Range: 2.5V to 9.8V n Constant Frequency 550kHz Operation n Low Dropout: 100% Duty Cycle n Output Voltage Down to 0.8V n Current Mode Operation for Excellent Line and Load Transient Response n Shutdown Mode Draws Only 8µA Supply Current n Tiny 6-Lead TSOT-23 Package.

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The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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LTC1772B Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 FEATURES n Burst Mode® Operation Disabled for Lower Output Ripple at Light Loads n High Efficiency: Up to 94% n High Output Currents Easily Achieved n Wide VIN Range: 2.5V to 9.8V n Constant Frequency 550kHz Operation n Low Dropout: 100% Duty Cycle n Output Voltage Down to 0.8V n Current Mode Operation for Excellent Line and Load Transient Response n Shutdown Mode Draws Only 8µA Supply Current n Tiny 6-Lead TSOT-23 Package APPLICATIONS n One or Two Lithium-Ion-Powered Applications n Cellular Telephones n Wireless Devices n Portable Computers n Distributed 3.3V, 2.5V or 1.