LTC3738

PRODUCTION

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

Data Sheet Product Selection Table
Viewing:

Overview

  • 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

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
LTC3738
3-Phase Buck Controller for Intel VRM9/VRM10 with Active Voltage Positioning
VRM10 Step-Down Controller Product Package 1
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project
Ask a Question

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

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

Learn More
Add to myAnalog

Add media to the Resources section of myAnalog, to an existing project or to a new project.

Create New Project

Software Resources

Can't find the software or driver you need?

Request a Driver/Software

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
Modal heading
Add to myAnalog

Add product to the Products section of myAnalog (to receive notifications), to an existing project or to a new project.

Create New Project

Evaluation Kits

eval board
schematic 1
DC721A-A

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

Buy Now View Details

Product Details

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.

eval board
schematic 2
DC721A-B

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

Buy Now View Details

Product Details

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.
DC721A-A
LTC3738CUHF/LTC3731CUH Demo Board | 6-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X / 10.X @ 120A
DC721A-A - Schematic
DC721A-B
LTC3738CUHF Demo Board | 3-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X/10.X @ 65A
DC721A-A - Schematic

Latest Discussions

No discussions on LTC3738 yet. Have something to say?

Start a Discussion on EngineerZone®

Recently Viewed