LTC3733

PRODUCTION

3-Phase, Buck Controllers for AMD CPUs

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Overview

  • 3-Phase Controller with Onboard MOSFET Drivers
  • Current Mode Control Ensures Current Sharing
  • Differential Amplifier Accurately Senses VOUT
  • ±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 COUT
  • 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

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
LTC3733
3-Phase, Buck Controllers for AMD CPUs
Figure 1. High Current Triple Phase Step-Down Converter Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Data Sheet

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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
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3733
  • LTC3733-1
LTspice

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

eval board
schematic 1
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 Details

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.
DC648A
LTC3733CG Demo Board | 3-Phase, AMD Hammer Processor Power Supply, VIN = 7V to 21V, VOUT = 0.8V to 1.55V @ 65A
DC648A - Schematic

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