LTC3770

PRODUCTION

LTC3770

Fast No R_SENSE^™ Step-Down Synchronous Controller with Margining, Tracking and PLL

PRODUCTION

High Efﬁciency Step-Down Converter slide

Efﬁciency and Power Loss vs Load Current slide

Efﬁciency and Power Loss vs Load Current

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Part Models 4

1ku List Price Starting From $4.73

Features

Wide V_IN Range: 4V to 32V
±0.67% 0.6V Reference Voltage
Output Voltage Tracking Capability
Programmable Margining
Sense Resistor Optional
True Current Mode Control
2% to 90% Duty Cycle at 200kHz
t_ON(MIN) ≤ 100ns
Phase Lock Loop Frequency Synchronization
Powerful Dual N-Channel MOSFET Driver
Adjustable Cycle-by-Cycle Current Limit
Adjustable Switching Frequency
Programmable Soft-Start
Current Foldback Protection (Disabled at Start-Up)
Output Overvoltage Protection
Micropower Shutdown: I_Q < 30µA
Power Good Output Voltage Monitor Tracks the Reference Input Pin
Available in (5mm × 5mm) QFN and 28-Lead SSOP Packages

Additional Details

The LTC3770 is a synchronous step-down switching regulator controller with output voltage up/down tracking capability and voltage margining. Its advanced functions and high accuracy reference are ideal for powering high performance server, ASIC and computer memory systems.

The LTC3770 uses a constant on-time, valley current mode control architecture to deliver very low duty factors without requiring a sense resistor. The operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-lock loop allows the IC to be synchronized to an external clock.

Fault protection is provided by an overvoltage comparator and input undervoltage lockout. The regulator current limit is user programmable. A wide supply range allows voltages as high as 32V to be stepped down to as low as a 0.6V output. Power supply sequencing is accomplished using an external soft-start timing capacitor.

Applications

Distributed Power Systems
Server Power Supply

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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 $4.73

Technical Documents 4

LTC3770: Fast No RSENSE Step-Down Synchronous Controller with Margining, Tracking and PLL Data Sheet 02/04/2009

R384 Reliability Data 03/26/2018

DC774A - Demo Manual 09/24/2009

Design Note 364: High Accuracy Synchronous Step-Down Controller Provides Output Tracking and Programmable Margining 11/06/2022

Reference Materials 1

LTC3770 - Fast DC/DC Controller with Margining, Tracking and PLL Capability 01/19/2005

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
LTC3770EG#PBF	28-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3770EG#TRPBF	28-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3770EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3770EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3770EG#PBF
Pin/Package Drawing
28-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3770EG#TRPBF
Pin/Package Drawing
28-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3770EUH#PBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3770EUH#TRPBF
Pin/Package Drawing
32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

Filter by Model

Part Models

Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC3770EG#PBF

PRODUCTION

LTC3770EG#TRPBF

PRODUCTION

pdf

PCN22_0171_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3770EUH#PBF

PRODUCTION

LTC3770EUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Filter by Model

Part Models

Product Lifecycle

PCN

Aug 6, 2022

- 22_0171

Laser Top Mark Conversion for SSOP Packages Assembled in PNG

LTC3770EG#PBF

PRODUCTION

LTC3770EG#TRPBF

PRODUCTION

pdf

PCN22_0171_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3770EUH#PBF

PRODUCTION

LTC3770EUH#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

xls

Material_Report

pdf

Detailed Change Description

pdf

Qualification Results Summary

Companion Parts 4

Parts	Product Life Cycle	Description
µModule Buck Regulators1
LTM4601A LTM4601A-1		12A μModule (Power Module) Regulators with PLL, Output Tracking and Margining
Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Silicon Oscillators1
LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

DC774A

LTC3770EUF Demo Board | Margining & Tracking, 5V ≤ VIN ≤ 28V, VOUT = 2.5V @ 10A

DC774A

LTC3770EUF Demo Board | Margining & Tracking, 5V ≤ VIN ≤ 28V, VOUT = 2.5V @ 10A

Buy Now View Details

Product Detail

Demonstration circuit 774 is a high efficiency synchronous step-down DC/DC converter featuring the LTC3770EUH No R_SENSE controller. It operates with a 5V to 28V input voltage range and provides a 2.5V output at up to 10A.

Resources

PDF

DC774A - Demo Manual

199.00K

PDF

DC774A - Schematic

121.00K

ZIP

DC774A - Design File

1.00M

DC774A

LTC3770EUF Demo Board | Margining & Tracking, 5V ≤ VIN ≤ 28V, VOUT = 2.5V @ 10A

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.