LTC3605A

PRODUCTION

LTC3605A

20V, 5A Synchronous Step-Down Regulator

PRODUCTION

Part Details

High Efficiency 1MHz, 5A Step-Down Regulator slide

High Efficiency 1MHz, 5A Step-Down Regulator

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Part Models 4

1ku List Price Starting From $5.07

Features

High Efficiency: Up to 96%
5A Output Current
4V to 20V V_IN Range
Integrated Power N-Channel MOSFETs (70mΩ Top and 35mΩ Bottom)
Adjustable Frequency 800kHz to 4MHz
PolyPhase^® Operation (Up to 12 Phases)
Output Tracking
0.6V ±1% Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Shutdown Mode Draws Less Than 15μA Supply Current
LTC3605: 15V Absolute Maximum V_IN
LTC3605A: 22V Absolute Maximum V_IN
The LTC3605A Is Pin Compatible with the LTC3605
Available in 24-Pin (4mm × 4mm) QFN Package

Additional Details

The LTC3605A is a high efficiency, monolithic synchronous buck regulator using a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC3605A regulators to run out of phase while using minimal input and output capacitance. The operating supply voltage range is from 20V down to 4V, making it suitable for dual, triple or quadruple lithium-ion battery inputs as well as point of load power supply applications from a 12V or 5V rail.

The operating frequency is programmable from 800kHz to 4MHz with an external resistor. The high frequency capability allows the use of small surface mount inductors. For switching noise sensitive applications, it can be externally synchronized from 800kHz to 4MHz. The PHMODE pin allows user control of the phase of the outgoing clock signal. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that are operating at high frequency while demanding fast transient response. Two internal phase-lock loops synchronize the internal oscillator to the external clock and also servos the regulator on-time to lock on to either the internal clock or the external clock if it’s present.


	Input Voltage Range
LTC3605	4V to 15V
LTC3605A	4V to 20V

Applications

Point of Load Power Supply
Portable Instruments
Distributed Power Systems
Battery-Powered Equipment

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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 $5.07

Documentation

Technical Documents 3

LTC3605A: 20V, 5A Synchronous Step-Down Regulator Data Sheet 09/20/2016

R539 Reliability Data 03/26/2018

DC1897B - Demo Manual 04/09/2014

Reference Materials 1

Power Management Solutions for NXP Processors 04/09/2018

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
LTC3605AEUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3605AEUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3605AIUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3605AIUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3605AEUF#PBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3605AEUF#TRPBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3605AIUF#PBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3605AIUF#TRPBF
Pin/Package Drawing
24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

Software & Part Ecosystem

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Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Evaluation Kit

DC1897B

LTC3605A Demo Board | 4V to 20V Input, VOUT = 2.5V/3.3V/5V/Adj at 5A

DC1897B

LTC3605A Demo Board | 4V to 20V Input, VOUT = 2.5V/3.3V/5V/Adj at 5A

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Product Detail

Demonstration circuit 1897 is a step-down converter, using the LTC3605A monolithic synchronous buck regulator. The DC1897B has a maximum input voltage of 20V, and is capable of delivering up to 5A of output current at a minimum input voltage of 4V. The output voltage of the DC1897B can be set as low as 0.6V, the reference voltage of the LTC3605A. It has a jumper that allows the output to be set at 2.5V, 3.3V or 5V. The LTC3605A has a phase-lock-loop circuit, allowing high current multiphase operation of several DC1897Bs in parallel.

Resources

ZIP

DC1897B - Design Files

2.00M

PDF

DC1897B - Demo Manual

614.00K

PDF

DC1897B - Schematic

50.00K

DC1897B

LTC3605A Demo Board | 4V to 20V Input, VOUT = 2.5V/3.3V/5V/Adj at 5A

Tools & Simulations

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

LTC3605A Demo Circuit - High Efficiency 1MHz Buck Regulator (4-20V to 1.8V @ 5A)

3.00K

Lt Spice

LTC3605A - Step-Down (Buck) Regulators

2.55 K

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

LTC3605A Project - 5A, 20V Monolithic Buck Regulator (4-20V to 2.5V @ 5A)

Reference Designs

Monolithic Power Tree Solution for the ZU7 FPGA

ZCU104

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

Download

ZCU104

Circuits from the lab

Zynq UltraScale+ MPSoC ZCU104 Paper Reference Design

Features and Benefits

The ZCU104 Evaluation Kit enables designers to jumpstart designs for embedded vision applications such as surveillance, Advanced Driver Assisted Systems (ADAS), machine vision, Augmented Reality (AR), drones and medical imaging.

The ADI Power delivery solutions support multiple reference designs using DC/DC module and monolithic solutions. ADI offers several options for powering the Zu7 FPGA.

Our module-based solutions combine a small footprint, while maximizing efficiency and tight regulation. Our monolithic based solutions support a lower cost optimized power delivery solution for mass production.

ADI provides supporting documentation to enable you to validate the power solution for your application seamlessly.

For a complete list power designs and use cases, please contact your local FAE.

Please refer to the circuit descriptions below that best support your design.

View Detailed Reference Design

Part Used 10

ADP1752

LTM4623

LTM4657

LTM4676A

LTM4622

ADP1753

LT3045

LTC3633A
LTC3633A-1

LT8652S

LTC3605A

nxp-freescale-qoriq-t1023rd

Download

nxp-freescale-qoriq-t1023rd

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