LTC1773

PRODUCTION

LTC1773

Synchronous Step-Down DC/DC Controller

PRODUCTION

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1ku List Price Starting From $3.15

Features

High Efficiency: Up to 95%
Constant Frequency 550kHz Operation
V_IN from 2.65V to 8.5V
V_OUT from 0.8V to V_IN
OPTI-LOOP^® Compensation Minimizes C_OUT
Synchronizable up to 750kHz
Selectable Burst Mode Operation
Low Quiescent Current: 80µA
Low Dropout Operation: 100% Duty Cycle
Secondary Winding Regulation
Soft-Start
Current Mode Operation for Excellent Line and Load Transient Response
Low Quiescent Current: 80µA
Low Shutdown I_Q = 10µA
±1.5% Reference Accuracy
Precision 2.5V Undervoltage Lockout
Available in 10-Lead MSOP

Additional Details

The LTC1773 is a current mode synchronous buck regulator controller that drives external complementary power MOSFETs using a fixed frequency architecture. The operating supply range is from 2.65V to 8.5V, making it suitable for 1- or 2-cell lithium-ion battery powered applications. Burst Mode^® operation provides high efficiency at low load currents. 100% duty cycle provides low dropout operation which extends operating time in battery-operated systems.

The operating frequency is internally set at 550kHz, allowing the use of small surface mount inductors. For switching-noise sensitive applications, it can be synchronized up to 750kHz. Peak current limit is user programmable with an external high side sense resistor. A SYNC/FCB control pin guarantees regulation of secondary windings regardless of load on the main output by forcing continuous operation. Burst Mode operation is inhibited during synchronization or when the SYNC/FCB pin is pulled low to reduce noise and RF interference. Soft-start is provided by an external capacitor.

Synchronous rectification increases efficiency and eliminates the need for a Schottky diode, saving components and board space. The LTC1773 comes in a 10-lead MSOP package.

Applications

Cellular Telephones
RF PA Supply
Portable Instruments
Wireless MODEMS
Distributed Power Systems
Notebook and Palm Top Computers, PDAs
Single and Dual Cell Lithium-Ion Powered Devices

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Ask a Question

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

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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 2

1ku List Price Starting From $3.15

Technical Documents 5

LTC1773: Synchronous Step-Down DC/DC Controller Data Sheet 08/23/2007

R384 Reliability Data 03/26/2018

DC309A - Demo Manual 09/24/2009

DC431A - Demo Manual 09/24/2009

DN295 - High Efficiency Adaptable Power Supply for XENPAK 10Gb/s Ethernet Transceivers 03/21/2014

Design Resources 2

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
LTC1773EMS#PBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1773EMS#TRPBF	10-Lead MSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1773EMS#PBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1773EMS#TRPBF
Pin/Package Drawing
10-Lead MSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

PCN/PDN Information

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Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0004

Epoxy Change from Henkel 8290 to 8290A for MSOP (3)

LTC1773EMS#PBF

PRODUCTION

LTC1773EMS#TRPBF

PRODUCTION

pdf

PCN24_0004_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Feb 4, 2020

- 20_0130

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC1773EMS#PBF

PRODUCTION

LTC1773EMS#TRPBF

PRODUCTION

pdf

PCN20_0130_Form

xls

Material_Report

Filter by Model

Part Models

Product Lifecycle

PCN

Jun 5, 2024

- 24_0004

Epoxy Change from Henkel 8290 to 8290A for MSOP (3)

LTC1773EMS#PBF

PRODUCTION

LTC1773EMS#TRPBF

PRODUCTION

pdf

PCN24_0004_Form

xls

Material_Report

pdf

Qualification Results Summary

xlsm

Delta Qualification Matrix

Feb 4, 2020

- 20_0130

Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC

LTC1773EMS#PBF

PRODUCTION

LTC1773EMS#TRPBF

PRODUCTION

pdf

PCN20_0130_Form

xls

Material_Report

Companion Parts 4

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Silicon Oscillators2
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LTC6909	PRODUCTION	1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation

DC309A

LTC1773EMS | 3A Synchronous Buck Regulator, 2.8V to 8.5V Input, 1.5V/1.8V/2.5V/3.3V @ 2.5A avg/3A Peak

DC309A

LTC1773EMS | 3A Synchronous Buck Regulator, 2.8V to 8.5V Input, 1.5V/1.8V/2.5V/3.3V @ 2.5A avg/3A Peak

Buy Now View Details

Product Detail

DC309A: Demo Board for LTC1773 Synchronous Step-Down DC/DC Controller.

Resources

PDF

DC309A - Demo Manual

252.00K

ZIP

DC309A - Design File

407.00K

PDF

DC309A - Schematic

21.00K

DC431A

LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A

DC431A

LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A

Buy Now View Details

Product Detail

DC431A Demo Board for:
LT1725 General Purpose Isolated Flyback Controller
LTC1773 Synchronous Step-Down DC/DC Controller

Resources

PDF

DC431A - Schematic

31.00K

ZIP

DC431A - Design File

1.00M

PDF

DC431A - Demo Manual

522.00K

DC309A

LTC1773EMS | 3A Synchronous Buck Regulator, 2.8V to 8.5V Input, 1.5V/1.8V/2.5V/3.3V @ 2.5A avg/3A Peak

DC431A

LT1725CGN LTC1773EMS | Telecom Input, Isolated 3 Output DC/DC Converter, +36V to +72V Input, VOUT = 5V/1A, 3.3V/5A, 2.5V/4A

LTspice 1

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