LTC3888

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. E) Product Selection Table

Part Models: 4
1ku List Price: Starting From $6.70

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Overview

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

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 main/subordinate configurations. The controller uses constant frequency current mode architecture to provide excellent transient response and output regulation. Each PWM main is capable of producing output voltages from 0.3 V to 3.45 V 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

Part Models: 4
1ku List Price: Starting From $6.70

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

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

Software Resources

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Tools & Simulations

LTspice 1

LTC7050 - Power Management, LTC3888 - Step-Down (Buck) Regulators

Models for the following parts are available in LTspice:

LTC3888
LTC3888-1

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

LTC3888-1

LTpowerPlay®

LTpowerPlay® is a powerful, Windows-based development environment supporting Linear Technology's Digital Power System Management (PSM) products.

Open Tool

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

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

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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

Product Details

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

UG-2149: Evaluating the LTC3888/LTC3888-1, 8-Phase, Single Output Synchronous Buck Converter with Power System Management (Rev.0)
4/24/2024

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

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Product Details

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.