LTC3608

PRODUCTION

18V, 8A Monolithic Synchronous Step-Down DC/DC Converter

Part Models: 4
1ku List Price: Starting From $8.95

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Overview

8A Output Current
Wide V_IN Range = 4V to 18V
Internal N-Channel MOSFETs
True Current Mode Control
Optimized for High Step-Down Ratios
t_ON(MIN) ≤ 100nsec
Extremely Fast Transient Response
Stable with Ceramic C_OUT
±1% 0.6V Voltage Reference
Power Good Output Voltage Monitor
Adjustable On-Time/Switching Frequency
Adjustable Current Limit
Programmable Soft-Start
Output Overvoltage Protection
Optional Short-Circuit Shutdown Timer
Low Shutdown I_Q: 15μA
Available in a 7mm × 8mm 52-Lead QFN Package

The LTC3608 is a high efficiency, monolithic synchronous step-down DC/DC converter that can deliver up to 8A output current from a 4V to 18V (20V maximum) input supply. It uses a valley current control architecture to deliver very low duty cycle operation at high frequency with excellent transient response. The operating frequency is selected by an external resistor and is compensated for variations in V_IN and V_OUT.

The LTC3608 can be configured for discontinuous or forced continuous operation at light load. Forced continuous operation reduces noise and RF interference while discontinuous mode provides high efficiency by reducing switching losses at light loads.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and an optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit is user programmable. A power good output voltage monitor indicates when the output is in regulation. The LTC3608 is available in a compact 7mm × 8mm QFN package.

Applications

Point of Load Regulation
Distributed Power Systems

Part Models: 4
1ku List Price: Starting From $8.95

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
LTC3608EWKG#PBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3608EWKG#TRPBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3608IWKG#PBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3608IWKG#TRPBF	52-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Switching Regulators & Controllers 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

Tools & Simulations

LTspice 1

LTC3608 Demo Circuit - 18V, 8A Synchronous Step-Down Converter (12V to 2.5V @ 8A)

Models for the following parts are available in LTspice:

LTC3608

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.

Evaluation Kits

LTC3608EWKG Demo Board | Monolithic, 5V ≤ VIN ≤ 20V, VOUT = 1.5V/1.8V/2.5V/3.3V @ 8A

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Product Details

Demonstration circuit 1320 is a high power density step-down DC/DC converter featuring the LTC3608EWKG (DC1320A-A) or the LTC3609EWKG (DC1320A-B) high current, high input voltage monolithic DC/DC step-down converter. The input voltage of the DC1320A-A is from 5V to 20V and it provides a jumper-selectable output voltage of 1.5V, 1.8V, 2.5V, or 3.3V @ 8A.

Resources

DC1320A - Design Files
5/14/2012

DC1320A - Demo Manual
5/14/2012

DC1320A - Schematic
5/14/2012

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

LTC3026-1

LTC3025-1
LTC3025-2
LTC3025-3
LTC3025-4

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

LTC3025-1
LTC3025-2
LTC3025-3
LTC3025-4

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