LTC1772B

PRODUCTION

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

Part Models: 4
1ku List Price: Starting From $2.27

Viewing:

Part Details

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

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

Part Models: 4
1ku List Price: Starting From $2.27

Documentation

Data Sheet 1

LTC1772B: Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 Data Sheet 05/09/2008

Reliability Data 1

R402 Reliability Data 03/27/2018

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.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC1772BES6#TRMPBF	6-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1772BES6#TRPBF	6-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1772BIS6#TRMPBF	6-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC1772BIS6#TRPBF	6-Lead TSOT-23	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 1

LTC1772B - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC1772
LTC1772B

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.

Latest Discussions

5 Years Ago