LTC3731

PRODUCTION

3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller

Data Sheet Product Selection Table
Part Models
8
1ku List Price
Starting From $5.76
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Part Details

  • 3-Phase Current Mode Controller with Onboard MOSFET Drivers
  • ±5% Output Current Matching Optimizes Thermal Performance and Size of Inductors and MOSFETs
  • Differential Amplifier Accurately Senses VOUT
  • ±1% VREF Accuracy Over Temperature
  • VOUT Range: 0.6V to 5.5V without Diffamp
  • VOUT Range: 0.6V to (VCC – 1.2V) with Diffamp
  • 250kHz to 600kHz Per Phase, PLL, Fixed Frequency
  • PWM, Stage Shedding™ or Burst Mode® Operation
  • OPTI-LOOP® Compensation Minimizes COUT
  • Adjustable Soft-Start Current Ramping
  • Short-Circuit Shutdown Timer with Defeat Option
  • Overvoltage Soft Latch
  • Adjustable Undervoltage Lockout Threshold
  • Selectable Phase Output for Up to 12-Phase Operation
  • Available in 5mm × 5mm QFN and 36-Pin Narrow (0.209") SSOP Packages
LTC3731
3-Phase, 600kHz, Synchronous Buck Switching Regulator Controller
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 4

Design Note 2

Technical Articles 2

Data Sheet

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

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Hardware Ecosystem

Parts Product Life Cycle Description
Digital Power System Managers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Multiple Output Buck Regulators 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LTC3731
  • LTC3731H
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
DC721A-A

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

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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
DC438A

LTC3731CG | 3-Phase, VIN = 9V to 14V, VOUT = 2.5V/1.8V @ 60A

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Product Details

Demonstration circuit 438 is a triple phase, single output synchronous buck converter featuring the LTC3731CG. This circuit can be used for desktop computers and servers, notebook computers and other high output current DC/DC converters. The output voltage can be configured for either 2.5V or 1.8V and the maximum load current is 60A. The input voltage range of DC438 is 9V to 14V.

eval board
schematic 3
DC561A-B

LTC3731CUH (x2) | 6-Phase, 10V - 14VIN, 1.5VOUT @ 90A

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Product Details

Demonstration circuit 561 is a high current stepdown PolyPhaseTM converter featuring the LTC3731 three-phase synchronous buck controller. The input voltage is from 10V to 14V and output is 1.5V. DC561A-A can provide up to 180A output current with a 12-phase buck circuit, while DC561A-B is a 6-phase buck converter with up to 90A output current. An optional VID controller circuit is available on both DC561A-A and DC561A-B demo circuits for output voltage programming.


 


eval board
schematic 4
DC561A-A

LTC3731CUH (x4) | 12-Phase, 10V - 14VIN, 1.5VOUT @ 180A

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Product Details

Demonstration circuit 561 is a high current stepdown PolyPhaseTM converter featuring the LTC3731 three-phase synchronous buck controller. The input voltage is from 10V to 14V and output is 1.5V. DC561A-A can provide up to 180A output current with a 12-phase buck circuit, while DC561A-B is a 6-phase buck converter with up to 90A output current. An optional VID controller circuit is available on both DC561A-A and DC561A-B demo circuits for output voltage programming.


 


eval board
schematic 5
DC558A

LTC3731CUH Demo Board | 3-Phase, VIN = 5V to 14V, VOUT = 1.5V/60A

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Product Details

Demonstration circuit 558 is a high current step-down PolyPhaseTM converter featuring the LTC3731 three phase synchronous buck controller. The demo circuit input voltage is from 5V to 14V and output is 1.5V/60A.
DC721A-A
LTC3738CUHF/LTC3731CUH Demo Board | 6-Phase, 8V ≤ VIN ≤ 14V, VOUT = VRM9.X / 10.X @ 120A
DC721A-A - Schematic
DC438A
LTC3731CG | 3-Phase, VIN = 9V to 14V, VOUT = 2.5V/1.8V @ 60A
DC438A - Schematic
DC561A-B
LTC3731CUH (x2) | 6-Phase, 10V - 14VIN, 1.5VOUT @ 90A
DC561A-B - Schematic
DC561A-A
LTC3731CUH (x4) | 12-Phase, 10V - 14VIN, 1.5VOUT @ 180A
DC561A-A - Schematic
DC558A
LTC3731CUH Demo Board | 3-Phase, VIN = 5V to 14V, VOUT = 1.5V/60A
DC558A - Schematic

Latest Discussions

4 Years Ago
RE: LTC3731 overvoltage function
4 Years Ago
RE: LTC3731 Datasheet explanation
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