LTC3888-1
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LTC3888-1

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $7.37
Features
  • PMBus/I2C Compliant Serial Interface
    • Monitor Voltage, Current, Temperature and Faults
    • Digitally Program VOUT, Margins, UV, OV, Current Limit, Soft-Start/Stop and Sequencing
  • Expandable to >16 Phases
  • 4.5V ≤ VIN ≤ 26.5V, 0.3V ≤ VOUT ≤ 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
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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
Part Models 4
1ku List Price Starting From $7.37

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3888IUHG-1#PBF
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LTC3888IUHG-1#TRPBF
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LTC3888IUHG-1#WPBF
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LTC3888IUHG-1#WTRPBF
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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC2652A-B

LTC3888-1 Demo Board | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

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DC2652A-B

LTC3888-1 Demo Board | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

LTC3888-1 Demo Board | 8-Phase, Dual-Output Synchronous Buck Converter with Power System Management

Product Detail

Demonstration circuit 2652A-B 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 LTC3888-1, which is a PMBus-compliant dual loop 8-phase step-down DC/DC controller with digital power system management. The LTC3888-1 is designed to work with DrMOS devices that provide an output current sense and temperature monitor. Please see LTC3888-1 data sheet for more detailed information.

DC2652A-B 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.

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DC2888A-A/
DC2888A-B

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

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DC2888A-A/<br>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

Features and Benefits

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

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.

Tools & Simulations

Tools & Simulations 2

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.

Reference Designs

Reference Designs 1

Versal HBM Diagram

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Circuits from the lab

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Features and Benefits

  • The Versal HBM series features heterogeneous integration of fast memory, secure connectivity, and adaptive compute to eliminate processing and memory bottlenecks for memory-bound, compute-intensive workloads such as machine learning, database acceleration, next-generation firewalls, and advanced network testers. Analog Devices has worked closely AMD to develop verified power solutions that optimize cost, size and efficiency in high performance applications.
  • ADI provides supporting documentation including LTpowerPlanner and applicable LTpowerPlay configuration files to enable you to validate the power solution for your application seamlessly. For a complete list  power designs and use cases, please contact your local local FAE.
  • ADI has also completed a complete power evaluation report for Mid-High Voltage rails. For a complete report please submit your interest here.

Key power regulators are used for this device as follows:

  • LTC3888-1
  • LTC7051
  • LTC3633A
  • LTC7200S
  • LTC7151S
  • LT8652
  • ADP125
  • LTC3617 (Optional)
  • LTC3618 (Optional)
View Detailed Reference Design external link

Reference Designs1

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