Overview
Features and Benefits
- 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
Product Details
The LTC3731 is a PolyPhase® 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 controller drives its output stages with 120° phase separation at frequencies of up to 600kHz per phase to minimize the RMS current losses in both the input and output filter capacitors. 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 Burst Mode operation.
A differential amplifier provides true remote sensing of both the high and low side of the output voltage at the point of load. The precision reference supports output voltages from 0.6V to 6V.
Soft-start and a defeatable, timed short-circuit shutdown protect the MOSFETs and the load. Current foldback provides protection for the external MOSFETs under short-circuit or overload conditions.
Applications
- Desktop Computers and Servers
- High Performance Notebook Computers
- High Output Current DC/DC Power Supplies
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (5)
Documentation & Resources
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R384 Reliability Data3/26/2018
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DC721A - Demo Manual9/24/2009
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DC561A - Demo Manual9/24/2009
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DC558A - Demo Manual9/24/2009
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DC438A - Demo Manual9/24/2009
Tools & Simulations
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
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.
LTspice Simulations
Models for the following parts are available in LTspice:
LTC3731
LTC3731H
Product Recommendations
LTC3731 Companion Parts
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3731CG#PBF | Material Declaration | Reliability Data | 24-Lead SSOP | |
| LTC3731CG#TRPBF | Material Declaration | Reliability Data | 24-Lead SSOP | |
| LTC3731CUH#PBF | Material Declaration | Reliability Data | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | |
| LTC3731CUH#TRPBF | Material Declaration | Reliability Data | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | |
| LTC3731IG#PBF | Material Declaration | Reliability Data | 24-Lead SSOP | |
| LTC3731IG#TRPBF | Material Declaration | Reliability Data | 24-Lead SSOP | |
| LTC3731IUH#PBF | Material Declaration | Reliability Data | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | |
| LTC3731IUH#TRPBF | Material Declaration | Reliability Data | 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R384 Reliability Data |
PCN-PDN Information
Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.
Support & Discussions
LTC3731 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.