LTC3633

PRODUCTION

LTC3633

Dual Channel 3A, 15V Monolithic Synchronous Step-Down Regulator

PRODUCTION

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Part Models 8

1ku List Price Starting From $5.07

Features

3.6V to 15V Input Voltage Range
3A Output Current per Channel
Up to 95% Efficiency
Low Duty Cycle Operation: 5% at 2.25MHz
Selectable 0°/180° Phase Shift Between Channels
Adjustable Switching Frequency: 500kHz to 4MHz
External Frequency Synchronization
Current Mode Operation for Excellent Line and Load Transient Response
0.6V Reference Allows Low Output Voltages
User Selectable Burst Mode^® Operation or Forced Continuous Operation
Output Voltage Tracking and Soft-Start Capability
Short-Circuit Protected
Overvoltage Input and Overtemperature Protection
Low Power 2.5V Linear Regulator Output
Power Good Status Outputs
Available in (4mm × 5mm) QFN-28 and 28-Lead TSSOP Packages

Additional Details

The LTC3633 is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time, current mode architecture, with phase lockable switching frequency. The two channels can run 180° out of phase, which relaxes the requirements for input and output capacitance. The operating supply voltage range is from 3.6V to 15V, making it suitable for dual cell lithium-ion batteries as well as point of load power supply applications from a 12V or 5V supply.

The operating frequency is programmable and synchronizable from 500kHz to 4MHz with an external resistor. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequency while demanding fast transient response. An internal phase lock loop servos the on-time of the internal one-shot timer to match the frequency of the internal clock or an applied external clock.

The LTC3633 can select between forced continuous mode and high efficiency Burst Mode operation.

Applications

Distributed Power Systems
Battery Powered Instruments
Point of Load Power Supplies

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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 $5.07

Technical Documents 5

LTC3633: Dual Channel 3A, 15V Monolithic Synchronous Step-Down Regulator Data Sheet 05/22/2015

R539 Reliability Data 03/26/2018

DC1347B - Demo Manual 12/02/2011

DN1020 - Dual Output Monolithic Synchronous Buck Regulator Operates from 3.6V to 15V Inputs and Delivers 3A Per Channel 11/10/2010

Design Note 1020: Dual Output Monolithic Synchronous Buck Regulator Operates from 3.6V to 15V Inputs and Delivers 3A Per Channel 09/06/2022

Reference Materials 1

μModule Power Products Simplify Power 04/11/2018

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
LTC3633EFE#PBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633EFE#TRPBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633EUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633EUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633IFE#PBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633IFE#TRPBF	28-Lead TSSOP w/ EP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633IUFD#PBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3633IUFD#TRPBF	28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3633EFE#PBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633EFE#TRPBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633EUFD#PBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633EUFD#TRPBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633IFE#PBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633IFE#TRPBF
Pin/Package Drawing
28-Lead TSSOP w/ EP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633IUFD#PBF
Pin/Package Drawing
28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3633IUFD#TRPBF
Pin/Package Drawing
28-Lead QFN (4mm 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

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3633EFE#PBF

PRODUCTION

LTC3633EFE#TRPBF

PRODUCTION

LTC3633IFE#PBF

PRODUCTION

LTC3633IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Filter by Model

Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3633EFE#PBF

PRODUCTION

LTC3633EFE#TRPBF

PRODUCTION

LTC3633IFE#PBF

PRODUCTION

LTC3633IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

xls

Material_Report

xlsm

Delta Qualification Matrix

Companion Parts 2

Parts	Product Life Cycle	Description
Multiple Output Buck Regulators2
LTC3633A LTC3633A-1		Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator
LTC3633A-2 LTC3633A-3		Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator

DC1347B

LTC3633EUFD Demo Board | 3.6V ≤ VIN ≤ 15V, VOUT1 = 1.2V/1.5V/1.8V @ 3A, VOUT2 = 2.5V/3.3V/5V @ 3A

DC1347B

LTC3633EUFD Demo Board | 3.6V ≤ VIN ≤ 15V, VOUT1 = 1.2V/1.5V/1.8V @ 3A, VOUT2 = 2.5V/3.3V/5V @ 3A

Buy Now View Details

Product Detail

Demonstration circuit DC1347 is a dual output regulator consisting of two constant-frequency step-down converters, based on the LTC3633 monolithic dual channel synchronous buck regulator. The DC1347 has an input voltage range of 3.6V to 15V, with each regulator capable of delivering up to 3A of output current.

Resources

PDF

DC1347B - Demo Manual

490.00K

PDF

DC1347B - Schematic

72.00K

ZIP

DC1347B - Design Files

3.00M

DC1347B

LTC3633EUFD Demo Board | 3.6V ≤ VIN ≤ 15V, VOUT1 = 1.2V/1.5V/1.8V @ 3A, VOUT2 = 2.5V/3.3V/5V @ 3A

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.

Lt Spice

LTC3633 - Step-Down (Buck) Regulators

3.33 K

Lt Spice

LTC3633 Demo Circuit - 3.3V/1.8V Buck Regulator with 2.5V LDO Output

4.00K

LTpowerCAD 1

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

To open the project file for this circuit:

Step 1: Download and install LTpowerCAD on your computer.

Step 2: Click on the link(s) in the section below to download part-specific project files.

Step 3: If the project file doesn't run, right-click the link and select "Save Target As." Then start the LTpowerCAD tool and open the project file by selecing "Open Project" from the "File" menu.

LTpowerCAD download and documentation

Simulation Model

LTpowerCAD

LTC3633 Project - Dual 3A Monolithic Buck Regulator (3.6-15V to 1.5V & 2.5V @ 3A)

Xilinx Basys 3 Artix-7 FPGA Board

Download

Xilinx Basys 3 Artix-7 FPGA Board

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design

Part Used 2

LTC3621

LTC3633

Altera Arria V GX Starter Kit

Download

Altera Arria V GX Starter Kit

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design

Part Used 4

LTC3605

LTC3025

LTC3633

LTC3880

Terasic DE1-SoC Development Kit

Download

Terasic DE1-SoC Development Kit

Circuits from the lab

Features and Benefits

Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
Our reference designs are supported by an intuitive design tool set and IP
Our team can provide designs for quick prototypes that can speed time to market in the most complex applications

View Detailed Reference Design