LTC3733

PRODUCTION

LTC3733

3-Phase, Buck Controllers for AMD CPUs

PRODUCTION

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

Figure 1. High Current Triple Phase Step-Down Converter

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Part Models 4

1ku List Price Starting From $5.24

Features

3-Phase Controller with Onboard MOSFET Drivers
Current Mode Control Ensures Current Sharing
Differential Amplifier Accurately Senses V_OUT
±5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs
Reduced Input and Output Capacitance
Supports Active Voltage Positioning
VID Programmable Output Voltage from 0.8V to 1.55V (AMD Opteron^™ CPU)
6-Phase, 90A to 120A Operation
Output Power Good Indicator with Adaptive Blanking
210kHz to 530kHz Per Phase, PLL, Fixed Frequency
Synchronizable (LTC3733-1)
PWM, Stage Shedding or Burst Mode^® Operation
OPTI-LOOP^® Compensation Minimizes C_OUT
Adjustable Soft-Start Current Ramping
Short-Circuit Shutdown Timer with Defeat Option
No_CPU Detection
36-Lead Narrow SSOP and 38-Lead (5mm × 7mm) QFN

Additional Details

The LTC3733 family are PolyPhase^® synchronous stepdown switching regulator controllers that drive all N-channel external power MOSFET stages in a phase-lockable, fixed frequency architecture. The 3-phase controller drives its output stages with 120° phase separation at frequencies of up to 530kHz per phase to minimize the RMS current dissipated by the ESR of both the input and output filter capacitors. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each phase at an optimal frequency for efficiency and ease of thermal design. Light load efficiency is optimized by using a choice of output stage shedding or Burst Mode technology.

A differential amplifier provides true remote sensing of both the high and low sides of the output voltage at load points.

Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. A foldback current circuit also provides protection for the external MOSFETs under short-circuit or overload conditions. An all-“1” VID detector turns off the regulator after 1µs timeout.

Applications

High Performance Notebook Computers
Servers, Desktop Computers and Workstations

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Support

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Visit the ADI Support Page

Ask the ADI community for help.

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FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $5.24

Technical Documents 4

LTC3733: 3-Phase, Buck Controllers for AMD CPUs Data Sheet 08/24/2007

R384 Reliability Data 03/26/2018

DC648A - Demo Manual 09/24/2009

Design Note 326: 3-Phase LTC3733 Provides High Performance Power Solutions for AMD Opteron and Athlon 64 Processors 11/01/2003

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
LTC3733CG#PBF	36-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3733CG#TRPBF	36-Lead SSOP	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3733CUHF-1#PBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3733CUHF-1#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3733CG#PBF
Pin/Package Drawing
36-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3733CG#TRPBF
Pin/Package Drawing
36-Lead SSOP
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3733CUHF-1#PBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

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

LTC3733CUHF-1#TRPBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm 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

Nov 18, 2019

- 19_0266

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

LTC3733CG#PBF

PRODUCTION

LTC3733CG#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

LTC3733CG#PBF

PRODUCTION

LTC3733CG#TRPBF

PRODUCTION

pdf

PCN19_0266_Form

xls

Material_Report

Detailed Parts List

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

DC648A

LTC3733CG Demo Board | 3-Phase, AMD Hammer Processor Power Supply, VIN = 7V to 21V, VOUT = 0.8V to 1.55V @ 65A

DC648A

LTC3733CG Demo Board | 3-Phase, AMD Hammer Processor Power Supply, VIN = 7V to 21V, VOUT = 0.8V to 1.55V @ 65A

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Product Detail

Demonstration circuit 648 is a high current step-down PolyPhaseTM supply featuring the LTC3733 three-phase synchronous buck controller. It provides high performance power solutions for AMD OpteronTM and AthlonTM 64 processors. The switching frequency range of the LTC3733 is 210kHz to 530kHz. The input supply voltage range is 7V to 21V and the nominal VID programmable output voltage is 0.8V-1.55V. The demo board can supply 65A of output current.

Resources

PDF

DC648A - Demo Manual

494.00K

ZIP

DC648A - Design File

2.00M

PDF

DC648A - Schematic

220.00K

DC648A

LTC3733CG Demo Board | 3-Phase, AMD Hammer Processor Power Supply, VIN = 7V to 21V, VOUT = 0.8V to 1.55V @ 65A

LTspice 1

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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.