LTC3888

RECOMMENDED FOR NEW DESIGNS

LTC3888

Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management

RECOMMENDED FOR NEW DESIGNS

LTC3888_LTC3888-1_LTC3888-2 Functional Block Diagram slide

LTC3888/LTC3888-1/LTC3888-2 Application Circuit slide

LTC3888/LTC3888-1/LTC3888-2 Pin Configuration slide

LTC3888/LTC3888-1/LTC3888-2 Performance Graph slide

LTC3888_LTC3888-1_LTC3888-2 Functional Block Diagram

LTC3888/LTC3888-1/LTC3888-2 Application Circuit

LTC3888/LTC3888-1/LTC3888-2 Pin Configuration

LTC3888/LTC3888-1/LTC3888-2 Performance Graph

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Part Models 4

1ku List Price Starting From $6.70

Features

PMBus/I²C Compliant Serial Interface
- Monitor Voltage, Current, Temperature and Faults
- Digitally Program V_OUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing
Expandable to >16 Phases
4.5V ≤ V_IN ≤ 26.5V, 0.3V ≤ V_OUT ≤ 3.45V
±0.5% Output Voltage Accuracy
Programmable PWM Loop Compensation
Accurate PolyPhase^® Current Sharing

Internal EEPROM with ECC and Fault Logging
DrMOS Output Current Monitor Interface
DrMOS Temperature/Fault Bus Interface
DrMOS Gate Drive Supply Monitor
Load Step Emulation
Internal or External PWM Clock from 250kHz to 1MHz
52-Pin (5mm × 8mm) QFN Package
AEC-Q100 Qualified for Automotive Applications

Additional Details

The LTC3888/LTC3888-1/LTC3888-2 is a PMBus-compliant dual loop DC/DC synchronous step-down switching regulator controller with eight expandable phases supporting a wide range of master/slave configurations. The controller uses constant frequency current mode architecture to provide excellent transient response and output regulation. Each PWM master is capable of producing output voltages from 0.3V to 3.45V with multiple phase configurations using DrMOS devices that provide an output current monitor.

PMBus configuration and monitoring is supported by LTpowerPlay^™ software. Programmable loop compensation and built-in load step emulation facilitate setting bandwidth based on input voltage and output load capacitance. PMBus commands allow read back of input voltage, output voltage and current, and operating status. Operating parameters can be set via PMBus command or stored in internal EEPROM for use at power up. Switching frequency, phase configuration, output voltage (LTC3888/LTC3888-2), output current limit (LTC3888-1) and device address can also be set using external programming resistors.

APPLICATIONS

High Current Distributed Power Systems
Servers, Network and Storage Equipment

View All Documentation

Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 4

1ku List Price Starting From $6.70

Technical Documents 10

LTC3888/LTC3888-1/LTC3888-2: Dual Loop 8-Phase Step-Down DC/DC Controller with Digital Power System Management Data Sheet (Rev.D) 10/27/2023

DC2652A-A - Demo Manual (Rev.0) 10/03/2022

UG-2149: Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management (Rev.0) 04/24/2024

AN-173: Designing High Phase Count Rails with LTC3888 (Rev.0) 03/09/2021

AN-153: Linduino for Power System Management 12/05/2016

AN-166: In Flight Update with Linduino 04/10/2017

AN-155: Fault Log Decoding with Linduino PSM 01/26/2017

AN-152: Power System Management Addressing (Rev.A) 07/12/2016

AN-145: Overview of the EEPROM in LTC PSM Devices 07/20/2015

AN-137: Accurate Temperature Sensing with an External P-N Junction 09/20/2012

Design Resources 4

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
LTC3888IUHG#PBF	52-Lead Plastic QFN (5mm × 8mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3888IUHG#TRPBF	52-Lead Plastic QFN (5mm × 8mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3888IUHG#WPBF	52-Lead Plastic QFN (5mm × 8mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3888IUHG#WTRPBF	52-Lead Plastic QFN (5mm × 8mm)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3888IUHG#PBF
Pin/Package Drawing
52-Lead Plastic QFN (5mm × 8mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3888IUHG#TRPBF
Pin/Package Drawing
52-Lead Plastic QFN (5mm × 8mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3888IUHG#WPBF
Pin/Package Drawing
52-Lead Plastic QFN (5mm × 8mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3888IUHG#WTRPBF
Pin/Package Drawing
52-Lead Plastic QFN (5mm × 8mm)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

DC2888A-A/
DC2888A-B

Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management

Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management

Download

DC2888A-A/
DC2888A-B

Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management

Features and Benefits

Input voltage range: 7 V to 14 V
Output voltage V_{OUT Max output current: 400 A}
Number of phases: 8
Current sense
Temperature monitor
PM bus compliant with digital power system management

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Product Detail

Demonstration circuit DC2888A-A/DC2888A-B is an 8-phase single- output, high efficiency, high density, synchronous buck converter with 7 V to 14 V input range. The output can supply up to 400 A maximum load current. The demo board showcases one LTC3888/LTC3888-1 working with eight LTC7051. The LTC3888/ LTC3888-1 is a PMBus-compliant dual loop 8-phase step-down DC/DC controller with digital power system management. LTC7051 is an integrated smart power stage with current sense and temperature monitor. Refer to the LTC3888/LTC3888-1 and LTC7051 data sheets for detailed information.

DC2888A-A/DC2888A-B powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay ™ on your PC and use Analog Devices' I²C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows to reconfigure the part on the fly and store the configuration in electrically erasable programmable read-only memory (EEPROM), and view the telemetry of voltage, current, temperature, and fault status.

Resources

PDF

UG-2149: Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management (Rev.0)

4.74 M

DC2652A-A

LTC3888 | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

DC2652A-A Evaluation Board - Bottom View

LTC3888 | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

Download

DC2652A-A

LTC3888 | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

Buy Now View Details

Product Detail

Demonstration circuit 2652A-A is an 8-phase dual-output, high efficiency, high density, synchronous buck converter with 7V to 14V input range. Each output can supply up to 120A maximum load current with 1V output. The demo board showcases the LTC3888, which is a PMBus-compliant dual loop 8-phase step-down DC/DC controller with digital power system management. The LTC3888 is designed to work with DrMOS devices that provide an output current sense and temperature monitor. Please refer to LTC3888’s data sheet for more detailed information.

DC2652A-A powers up to default settings and produces power based on configuration resistors (or with the setting in its non-volatile memory) without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay^™ onto your PC and use ADI’s I²C/SMBus/PMBus dongle DC1613A to connect to the board. LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status.

GUI Download
The software can be downloaded from: LTpowerPlay
For more details and instructions of LTpowerPlay, please refer to “LTpowerPlay Quick Start Procedure” in the demo manual.

Resources

ZIP

DC2652A - Design Files

7.11 M

PDF

DC2652A-A - Schematic

200.53 K

PDF

DC2652A-A - Demo Manual (Rev.0)

1.85 M

DC2888A-A/<br>DC2888A-B

Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management

DC2652A-A

LTC3888 | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

LTspice 1

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.