LTC3605

PRODUCTION

15V, 5A Synchronous Step-Down Regulator

Data Sheet (Rev. I) Product Selection Table

Part Models: 8
1ku List Price: Starting From $5.07

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Part Details

High Efficiency: Up to 96%
5A Output Current
4V to 15V 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
Available in 24-Pin (4mm × 4mm) QFN Package
AEC-Q100 Qualified for Automotive Applications

The LTC3605 is a high efficiency, monolithic synchronous buck regulator using a phase lockable controlled on-time constant frequency, current mode architecture. PolyPhase operation allows multiple LTC3605 regulators to run out of phase while using minimal input and output capacitance. The operating supply voltage range is from 15V down to 4V, making it suitable for dual 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

Part Models: 8
1ku List Price: Starting From $5.07

Documentation

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
LTC3605EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605EUF#WPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605EUF#WTRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605IUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605IUF#WPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3605IUF#WTRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Silicon Oscillators 1
LTC6908		Resistor Set SOT-23 Oscillator with Spread Spectrum Modulation
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTC3605
LTC3605A

LTpowerCAD 1

LTC3605 Project - 15V, 5A Monolithic Buck Regulator (5-14V to 3.3V @ 5A)

Design tools for the following parts are available in LTpowerCAD:

LTC3605
LTC3605A

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.

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.

Evaluation Kits

LTC3605EUF Demo Board | 4V ≤ VIN ≤ 15V, VOUT = 2.5V/3.3V/5V @ 5A

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Product Details

Demonstration circuit 1215 is a step-down converter, using the LTC3605 monolithic synchronous buck regulator. The DC1215A has a maximum input voltage 15V, and is capable of delivering up to 5A of output current at a minimum input voltage of 4V. The output voltage of the DC1215A can be set as low as 0.6V, the reference voltage of the LTC3605.

Resources

DC1215A - Demo Manual
9/24/2009

DC1215A - Design File
9/24/2009

DC1215A - Schematic
9/24/2009

Reference Designs

View Detailed Reference Design

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

Part Used

View Detailed Reference Design

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

Part Used

View Detailed Reference Design

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

Part Used

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View Detailed Reference Design

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

Part Used

View Detailed Reference Design

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

Part Used

View Detailed Reference Design

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

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View Detailed Reference Design

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

Part Used

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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Product Selector Card 1

Webcast 3

Software Resources

Can't find the software or driver you need?

Hardware Ecosystem

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

Evaluation Kits

Product Details

Resources

Reference Designs

Features and Benefits

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