LTC1772

PRODUCTION

LTC1772

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

PRODUCTION

Part Details

Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator slide

Figure 1. High Efficiency, High Output Current 2.5V/2A Regulator

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Part Models 8

1ku List Price Starting From $2.59

Features

High Efficiency: Up to 94%
High Output Currents Easily Achieved
Wide V_IN Range: 2.5V to 9.8V
Constant Frequency 550kHz Operation
Burst Mode^® Operation at Light Load
Low Dropout: 100% Duty Cycle
Tiny 6-Lead SOT-23 Package
0.8V Reference Allows Low Output Voltages
Current Mode Operation for Excellent Line and Load
Transient Response
Low Quiescent Current: 270µA
Shutdown Mode Draws Only 8µA Supply Current
±2.5% Reference Accuracy

Additional Details

The LTC1772 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 LTC1772 when the input voltage falls below 2.0V.

The LTC1772 provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode operation, which enhances efficiency at low output current.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).In shutdown, the device draws a mere 8µA. High constant operating frequency of 550kHz allows the use of a small external inductor.

The LTC1772 is available in a small footprint 6-lead SOT-23.


	Burst Mode
LTC1772	Yes
LTC1772B	No

Applications

One or Two Lithium-Ion-Powered Applications
Cellular Telephones
Wireless Modems
Portable Computers
Distributed 3.3V, 2.5V or 1.8V Power Systems
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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 8

1ku List Price Starting From $2.59

Documentation

Technical Documents 4

LTC1772: Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23 Data Sheet 08/30/2007

R402 Reliability Data 03/27/2018

DC279A - Demo Manual 09/24/2009

DC270A - Demo Manual 09/24/2009

Design Resources 8

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
LTC1772CS6#TRMPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772CS6#TRPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772ES6#TRMPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772ES6#TRPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772HS6#TRMPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772HS6#TRPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772IS6#TRMPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1772IS6#TRPBF	6-Lead TSOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1772CS6#TRMPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772CS6#TRPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772ES6#TRMPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772ES6#TRPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772HS6#TRMPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772HS6#TRPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772IS6#TRMPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC1772IS6#TRPBF
Pin/Package Drawing
6-Lead TSOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Software & Part Ecosystem

Companion Parts 3

Parts	Product Life Cycle	Description
Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
External Power Switch Buck Controllers1
LTC3801	PRODUCTION	Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Evaluation Kit

DC270A

LTC1772CS6 | 1 Amp, SOT-23 DC/DC Converter, 2.5 to 9.8VIN, 2.5VOUT

DC270A

LTC1772CS6 | 1 Amp, SOT-23 DC/DC Converter, 2.5 to 9.8VIN, 2.5VOUT

Buy Now View Details

Product Detail

DC270A: Demo Board for the LTC1772 Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23.

Resources

PDF

DC270A - Schematic

17.00K

PDF

DC270A - Demo Manual

189.00K

ZIP

DC270A - Design File

48.00K

DC279A-B

LTC1736, LTC1772, LTC1762 | Low Cost VRM (Intel), 7.5 to 24VIN, 1.3V to 1.6VOUT @ 14A, 1.5VOUT @ 0.12 to 2.5A, 2.5VOUT @ 0.15A

DC279A-B

LTC1736, LTC1772, LTC1762 | Low Cost VRM (Intel), 7.5 to 24VIN, 1.3V to 1.6VOUT @ 14A, 1.5VOUT @ 0.12 to 2.5A, 2.5VOUT @ 0.15A

Buy Now View Details

Product Detail

DC279A-B Demo Board for:

LTC1736 5-Bit Adjustable High Efficiency Synchronous Step-Down Switching Regulator

LT1762 150mA, Low Noise, LDO Micropower Regulators

LTC1772 Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

Resources

PDF

DC279A - Demo Manual

59.00K

ZIP

DC279A - Design File

267.00K

PDF

DC279A - Schematic

104.00K

DC270A

LTC1772CS6 | 1 Amp, SOT-23 DC/DC Converter, 2.5 to 9.8VIN, 2.5VOUT

DC279A-B

LTC1736, LTC1772, LTC1762 | Low Cost VRM (Intel), 7.5 to 24VIN, 1.3V to 1.6VOUT @ 14A, 1.5VOUT @ 0.12 to 2.5A, 2.5VOUT @ 0.15A

Tools & Simulations

LTspice 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.