LTC3772

PRODUCTION

LTC3772

Micropower No R_SENSE Constant Frequency Step-Down DC/DC Controller

PRODUCTION

550kHz Micropower Step-Down DC/DC Converter slide

Efficiency and Power Loss vs Load Current slide

550kHz Micropower Step-Down DC/DC Converter

Efficiency and Power Loss vs Load Current

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Part Models 4

1ku List Price Starting From $2.27

Features

No Current Sense Resistor Required
40µA No-Load Quiescent Current
High Output Currents Easily Achieved
Internal Soft-Start Ramps V_OUT
Wide V_IN Range: 2.75V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Low Ripple Burst Mode^® Operation at Light Load
Output Voltage as Low as 0.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Only 8µA Supply Current in Shutdown
Low Profile 8-Lead SOT-23 (1mm) and (3mm × 2mm) DFN (0.75mm) Packages

Additional Details

The LTC3772 is a constant frequency current mode step-down DC/DC controller in a low profile 8-lead SOT-23 (ThinSOT^™) and a 3mm × 2mm DFN package. The No R_SENSE^™ architecture eliminates the need for a current sense resistor, improving efficiency and saving board space.

The LTC3772 automatically switches into Burst Mode operation at light loads to increase efficiency at low output current. It consumes only 40µA of quiescent current under a no-load condition.

The LTC3772 incorporates an undervoltage lockout feature that shuts down the device when the input voltage falls below 2V. To maximize the runtime from a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor and capacitors. An internal soft-start smoothly ramps the output voltage from zero to its regulation point.


	Burst Mode
LTC3772	Yes
LTC3772B	No

Applications

1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed 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 4

1ku List Price Starting From $2.27

Technical Documents 3

LTC3772: Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller Data Sheet 11/09/2007

R421 Reliability Data 03/23/2018

DC836A - Demo Manual 09/24/2009

Reference Materials 1

Micropower No RSENSE Constant Frequency Step-Down DC/DC Controller in 2mm x 3mm DFN 04/27/2005

Design Resources 4

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
LTC3772EDDB#TRMPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3772EDDB#TRPBF	8-Lead DFN (3mm x 2mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3772ETS8#TRMPBF	8-Lead SOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3772ETS8#TRPBF	8-Lead SOT-23	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3772EDDB#TRMPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3772EDDB#TRPBF
Pin/Package Drawing
8-Lead DFN (3mm x 2mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3772ETS8#TRMPBF
Pin/Package Drawing
8-Lead SOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3772ETS8#TRPBF
Pin/Package Drawing
8-Lead SOT-23
Documentation

HTML Material Declaration

HTML Reliablity Data

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

Companion Parts 3

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DC836A

LTC3772EDDB Demo Board | VIN = 2.75V to 8V, VOUT = 1.8V/2.5V/3.3V @ 2A

DC836A

LTC3772EDDB Demo Board | VIN = 2.75V to 8V, VOUT = 1.8V/2.5V/3.3V @ 2A

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Product Detail

Demonstration circuit 836 is a No R_SENSE^™ constant frequency step-down DC/DC converter featuring the LTC3772 Burst-Mode capable, nonsynchronous controller in a 3mm × 2mm DFN package. The demo board has an input voltage range of 2.75V to 8V and provides 2A at one of the three jumper-selectable output voltages: 1.8V, 2.5V or 3.3V.

Resources

PDF

DC836A - Schematic

26.00K

ZIP

DC836A - Design File

439.00K

PDF

DC836A - Demo Manual

122.00K

DC836A

LTC3772EDDB Demo Board | VIN = 2.75V to 8V, VOUT = 1.8V/2.5V/3.3V @ 2A

LTspice 2

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.