Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

The LTC1772B 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.

The LTC1772B provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. In shutdown, the device draws a mere 8µA.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor.

The LTC1772B is available in a small footprint 6-lead SOT-23.

For a Burst Mode operation enabled version of the LTC1772B, please refer to the LTC1772 data sheet.

Burst Mode

LTC1772

Yes

LTC1772B

No

Applications

* One or Two Lithium-Ion-Powered Applications

* Cellular Telephones

* Wireless Devices

* Portable Computers

* Distributed 3.3V, 2.5V or 1.8V Power Systems

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LTC1772B

Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

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Data Sheet

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LTC1772B: Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 Data Sheet

05/09/2008

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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LTC1772BES6#TRMPBF

6-Lead TSOT-23

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SamacSys

LTC1772BES6#TRPBF

6-Lead TSOT-23

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SamacSys

LTC1772BIS6#TRMPBF

6-Lead TSOT-23

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Material Declaration

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Reliability Report

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Package Resources

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Ultra Librarian

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SamacSys

LTC1772BIS6#TRPBF

6-Lead TSOT-23

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Material Declaration

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SamacSys

Data Sheet

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Power System Management (PSM) & Sequencers

1

LTC2974

RECOMMENDED FOR NEW DESIGNS

4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

Switching Regulators & Controllers

1

LTC3880

RECOMMENDED FOR NEW DESIGNS

Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

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LTspice

Models for the following parts are available in LTspice:

* LTC1772

* LTC1772B

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

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2 Years Ago

LTC1772B Undervoltage Lockout

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* Burst Mode® Operation Disabled for Lower Output Ripple at Light Loads

* High Efficiency: Up to 94%

* High Output Currents Easily Achieved

* Wide VIN Range: 2.5V to 9.8V

* Constant Frequency 550kHz Operation