LTC1649

PRODUCTION

LTC1649

3.3V Input High Power Step-Down Switching Regulator Controller

PRODUCTION

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Part Models 4

1ku List Price Starting From $5.88

Features

High Power 3.3V to 1.XV-2.XV Switching Regulator Controller: Up to 20A Output
All N-Channel External MOSFETs
Provides 5V MOSFET Gate Drive with 3.3V Input
Constant Frequency Operation Minimizes Inductor Size
Excellent Output Regulation: ±1% Over Line, Load and Temperature Variations
High Efficiency: Over 90% Possible
No Low-Value Sense Resistor Needed
Available in 16-Lead SO Package

Additional Details

The LTC1649 is a high power, high efficiency switching regulator controller optimized for use with very low supply voltages. It operates from 2.7V to 5V input, and provides a regulated output voltage from 1.26V to 2.5V at up to 20A load current. A typical 3.3V to 2.5V application features efficiency above 90% from 1A to 10A load. The LTC1649 uses a pair of standard 5V logic-level N-channel external MOSFETs, eliminating the need for expensive P-channel or super-low-threshold devices.

The LTC1649 shares its internal switching architecture with the LTC1430, and features the same ±1% line, load and temperature regulation characteristics. Current limit is user-adjustable without requiring an external low-value sense resistor. The LTC1649 uses a 200kHz switching frequency and voltage mode control, minimizing external component count and size. Shutdown mode drops the quiescent current to below 10µA.

The LTC1649 is available in the 16-pin narrow SO package.

Applications

3.3V Input Power Supply for Low Voltage Microprocessors and Logic
Low Input Voltage Power Supplies
High Power, Low Voltage Regulators
Local Regulation for Multiple Voltage Distributed Power Systems

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Ask a Question

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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.

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FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $5.88

Technical Documents 3

LTC1649: 3.3V Input High Power Step-Down Switching Regulator Controller Data Sheet 08/29/2007

R302 Reliability Data 03/22/2018

DC202A - Demo Manual 09/24/2009

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
LTC1649CS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1649CS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1649IS#PBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1649IS#TRPBF	16-Lead SOIC (Narrow 0.15 Inch)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1649CS#PBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1649CS#TRPBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1649IS#PBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1649IS#TRPBF
Pin/Package Drawing
16-Lead SOIC (Narrow 0.15 Inch)
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

Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LTC1649CS#PBF

PRODUCTION

LTC1649CS#TRPBF

PRODUCTION

LTC1649IS#PBF

PRODUCTION

LTC1649IS#TRPBF

PRODUCTION

pdf

PCN22_0252_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LTC1649CS#PBF

PRODUCTION

LTC1649CS#TRPBF

PRODUCTION

LTC1649IS#PBF

PRODUCTION

LTC1649IS#TRPBF

PRODUCTION

pdf

PCN22_0173_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Oct 12, 2022

- 22_0252

Epoxy Change from Henkel 8290 to 8290A for 16-Lead SOIC Package

LTC1649CS#PBF

PRODUCTION

LTC1649CS#TRPBF

PRODUCTION

LTC1649IS#PBF

PRODUCTION

LTC1649IS#TRPBF

PRODUCTION

pdf

PCN22_0252_Form

xls

Material_Report

pdf

Qualification Results Summary

Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LTC1649CS#PBF

PRODUCTION

LTC1649CS#TRPBF

PRODUCTION

LTC1649IS#PBF

PRODUCTION

LTC1649IS#TRPBF

PRODUCTION

pdf

PCN22_0173_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Companion Parts 1

Parts	Product Life Cycle	Description
External Power Switch Buck Controllers1
LTC3713	PRODUCTION	Low Input Voltage, High Power, No R_SENSE^™ Synchronous Buck DC/DC Controller

DC202A

LTC1649CS | LOW INPUT VOLTAGE SWITCHING REGULATOR, VIN = 3.3V VOUT = 1.8V to 2.5V @ 15A (thru-hole caps)

DC202A

LTC1649CS | LOW INPUT VOLTAGE SWITCHING REGULATOR, VIN = 3.3V VOUT = 1.8V to 2.5V @ 15A (thru-hole caps)

Buy Now View Details

Product Detail

DC202A: Demo Board for the LTC1649 3.3V Input High Power Step-Down Switching Regulator Controller.

Resources

PDF

DC202A - Demo Manual

350.00K

ZIP

DC202A - Design File

1.00M

PDF

DC202A - Schematic

66.00K

DC202A

LTC1649CS | LOW INPUT VOLTAGE SWITCHING REGULATOR, VIN = 3.3V VOUT = 1.8V to 2.5V @ 15A (thru-hole caps)

LTspice 1

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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.