LTC1709-9

PRODUCTION

LTC1709-9

2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators

PRODUCTION

Part Details

Figure 1. High Current 2-Phase Step-Down Converter slide

Figure 1. High Current 2-Phase Step-Down Converter

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Part Models 2

1ku List Price Starting From $5.97

Features

Single Controller Operates Two Output Stages Antiphase Reducing Required Input Capacitance and Power Supply Induced Noise
Two 5-Bit Desktop VID Codes:

LTC1709-8 For VRM8.4 (V_OUT from 1.3V to 3.5V)
LTC1709-9 For VRM9.0 (V_OUT from 1.1V to 1.85V)

Current Mode Control Ensures Best Current Sharing
True Remote Sensing Differential Amplifier
Power Good Output Indicator
OPTI-LOOP^™ Compensation Minimizes C_OUT
Programmable Fixed Frequency: 150kHz to 300kHz
±1% Output Voltage Accuracy
Wide V_IN Range: 4V to 36V Operation
Adjustable Soft-Start Current Ramping
Internal Current Foldback and Short-Circuit Shutdown
Overvoltage Soft Latch Eliminates Nuisance Trips
Low Shutdown Current: 20µA
Available in 36-Lead Narrow SSOP Package

Additional Details

The LTC1709-8/LTC1709-9 are 2-phase, VID programmable, synchronous step-down switching regulator controllers that drive two all N-channel external power MOSFET stages in a fixed frequency architecture. The 2-phase controller drives its two output stages out of phase at frequencies from 150kHz to 300kHz to minimize the RMS ripple currents in both input and output capacitors. The 2-phase technique effectively multiplies the fundamental frequency by two, improving transient response while operating each channel at an optimum frequency for efficiency. Thermal design is also simplified.

An internal differential amplifier provides true remote sensing of the regulated supply’s positive and negative output terminals as required for high current applications.

The RUN/SS pin provides soft-start and optional timed, short-circuit shutdown. Current foldback limits MOSFET dissipation during short-circuit conditions when the overcurrent latchoff is disabled. OPTI-LOOP compensation allows the transient response to be optimized for a wide range of output capacitors and ESR values. The LTC1709-8/LTC1709-9 implement two different VID tables compliant with VRM8.4 and VRM9.0 respectively.


	Vout Range	VRM
LTC1709	1.3V to 3.5V	VRM8.4
LTC1709-7	0.925V to 2V	Mobile
LTC1709-8	1.3V to 3.5V	VRM8.4
LTC1709-85	1.05V to 1.825V	VRM8.5
LTC1709-9	1.1V to 1.85V	VRM9.0

Applications

Workstations
Internet Servers
Large Memory Arrays
DC Power Distribution 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.

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Ask the ADI community for help.

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FAQs

Sales & Ordering FAQs

Part Models 2

1ku List Price Starting From $5.97

Documentation

Technical Documents 6

The LTC1709-8/LTC1709-9: 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators Data Sheet 02/03/2010

R384 Reliability Data 03/26/2018

DC292A - Demo Manual 09/24/2009

DC311A - Demo Manual 09/24/2009

Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors 08/21/2007

Design Note 225: Low Cost, High Efficiency 42A DC/DC Converter 11/03/2022

Design Resources 2

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
LTC1709EG-9#PBF	36-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC1709EG-9#TRPBF	36-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC1709EG-9#PBF
Pin/Package Drawing
36-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC1709EG-9#TRPBF
Pin/Package Drawing
36-Lead SSOP
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

Nov 18, 2019

- 19_0266

Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC

LTC1709EG-9#PBF

PRODUCTION

LTC1709EG-9#TRPBF

PRODUCTION

pdf

PCN19_0266_Form

xls

Material_Report

Detailed Parts List

Filter by Model

Part Models

Product Lifecycle

PCN

Nov 18, 2019

- 19_0266

Laser Top Mark for SSOP36/44/48 Packages assembled in ADPG and UTAC

LTC1709EG-9#PBF

PRODUCTION

LTC1709EG-9#TRPBF

PRODUCTION

pdf

PCN19_0266_Form

xls

Material_Report

Detailed Parts List

Software & Part Ecosystem

Companion Parts 4

Parts	Product Life Cycle	Description
Digital Power System Managers1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Evaluation Kit

DC292B-C

LTC1709EG-9 | High Current VRM 9.0 CPU Power Supply, 12VIN, 1.6VOUT @ 45A, (mostly Surface Mount Caps)

DC292B-C

LTC1709EG-9 | High Current VRM 9.0 CPU Power Supply, 12VIN, 1.6VOUT @ 45A, (mostly Surface Mount Caps)

Buy Now View Details

Product Detail

DC292B-C: Demo Board for the LTC1709-9 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators.

Resources

PDF

DC292A - Demo Manual

171.00K

ZIP

DC292A - Design File

829.00K

PDF

DC292A - Schematic

164.00K

DC311A

LTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, VIN = 12V, VOUT = 1.1V~1.8V @ 60A

DC311A

LTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, VIN = 12V, VOUT = 1.1V~1.8V @ 60A

Buy Now View Details

Product Detail

DC311A Demo Board for:
LTC1629 PolyPhase, High Efficiency, Synchronous Step-Down Switching Regulator
LTC1709-9 2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulators

Resources

PDF

DC311A - Demo Manual

20.00K

ZIP

DC311A - Design File

2.00M

PDF

DC311A - Schematic

91.00K

DC292B-C

LTC1709EG-9 | High Current VRM 9.0 CPU Power Supply, 12VIN, 1.6VOUT @ 45A, (mostly Surface Mount Caps)

DC311A

LTC1709-9EG / LTC1629CG | 4-Phase High Current Power Supply, VIN = 12V, VOUT = 1.1V~1.8V @ 60A

Tools & Simulations

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.