LTC3738
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LTC3738

3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning

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Part Models 2
1ku List Price Starting From $5.59
Features
  • 3-Phase Controller with Onboard MOSFET Drivers
  • Programmable Active Voltage Positioning (AVP) with True Current Sensing
  • Programmable External Thermal Detection or Internal Thermal Sensing
  • Precise Output Current Matching Optimizes Thermal Performance and Solution Size
  • Supports Starting into Precharged VOUTS
  • Differential Amplifier Accurately Senses VOUT
  • PWM, Pulse Skip and Stage Shedding™ Operation
  • Synchronizable
  • 210kHz to 530kHz Per Phase, Fixed Frequency
  • Output Power Good Indicator with Adaptive Blanking
  • Adjustable Soft-Start Current Ramping
  • Short-Circuit Shutdown Timer with Defeat Option
  • OPTI-LOOP® Compensation Minimizes COUT
  • 38-Lead (5mm × 7mm) QFN Package
Additional Details
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The LTC3738 is a 3-phase synchronous step-down switching regulator controller that drives all N-channel external power MOSFET stages in a phase-lockable, fixed frequency architecture. The 3-phase technique effectively triples the fundamental frequency, improving transient response while operating each controller 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 Pulse Skip mode technology.

The LTC3738 also allows users to program load slope via a resistor for AVP control. Both external and internal thermal sensing are available from the on-chip thermal detector and comparator.

A differential amplifier provides sensing of both the high and low sides of the output voltage.

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 a 1µs timeout.

Applications

  • High Performance Notebook Computers
  • Servers, Desktop Computers and Workstations
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Part Models 2
1ku List Price Starting From $5.59
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LTC3738

Documentation

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Data Sheet

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UPDATED 08/28/2007
English

LTC3738: 3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning Data Sheet

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UPDATED 11/29/2006
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LTC3738: アクティブ電圧ポジショニング付き、インテルVRM9/VRM10向け3フェーズ降圧コントローラ データシート

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Reliability Data

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UPDATED 03/26/2018
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R384 Reliability Data redirect icon

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User Guide

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UPDATED 09/24/2009
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DC721A - Demo Manual redirect icon

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Documentation

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
LTC3738CUHF#PBF 38-Lead QFN (5mm x 7mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3738CUHF#TRPBF 38-Lead QFN (5mm x 7mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
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Evaluation Kit

Evaluation Kits 2

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DC721A-B

LTC3738CUHF Demo Board | 3-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X/10.X @ 65A

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DC721A-B

LTC3738CUHF Demo Board | 3-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X/10.X @ 65A

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Download

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DC721A-B
LTC3738CUHF Demo Board | 3-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X/10.X @ 65A
Buy Now View Details

Product Detail

Demonstration circuits 721A-A and 721A-B are high current step-down converters for Intel VRM/VRD10 and VRM9 processor power applications. The 6-phase DC721A-A features two current-mode PolyPhaseTM controllers, the LTC3738CUHF (3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning and the the LTC3731CUH (3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller). and provides up to 120A output current. The DC721A-B is a single LTC3738 3-phase 65A output supply. The input voltage range for both demo boards is from 8V to 14V, and the output voltage is controlled by the VID setting.



Resources

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PDF

DC721A - Schematic Download

199.00K

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DC721A - Demo Manual Download

1.00M

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DC721A - Design File Download

2.00M

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DC721A-A

LTC3738CUHF/LTC3731CUH Demo Board | 6-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X / 10.X @ 120A

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DC721A-A

LTC3738CUHF/LTC3731CUH Demo Board | 6-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X / 10.X @ 120A

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Download

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Print
DC721A-A
LTC3738CUHF/LTC3731CUH Demo Board | 6-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X / 10.X @ 120A
Buy Now View Details

Product Detail

Demonstration circuits 721A-A and 721A-B are high current step-down converters for Intel VRM/VRD10 and VRM9 processor power applications. The 6-phase DC721A-A features two current-mode PolyPhaseTM controllers, the LTC3738CUHF (3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning and the the LTC3731CUH (3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller) and provides up to 120A output current. The input voltage is from 8V to 14V and the output voltage is controlled by the VID setting.

Resources

pdf icon

PDF

DC721A - Schematic Download

199.00K

pdf icon

PDF

DC721A - Demo Manual Download

1.00M

pdf icon

ZIP

DC721A - Design File Download

2.00M

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Evaluation Kits2

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DC721A-B

LTC3738CUHF Demo Board | 3-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X/10.X @ 65A
evaluation kit item images

DC721A-A

LTC3738CUHF/LTC3731CUH Demo Board | 6-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X / 10.X @ 120A

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