LTC7131-1

RECOMMENDED FOR NEW DESIGNS

25A Monolithic Synchronous DC/DC Step-Down Converter with PMBus Interface

Data Sheet (Rev. A) Product Selection Table
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Overview

  • 4.5V to 20V VIN Range
  • 1% Total VOUT Accuracy Over Temperature
  • Single Resistor-Programmable Reference Voltage: 0.4V to 3.5V
  • PMBus Compliant Serial Interface:
    • Programmable Output Voltage Margining: Up to ±25% VOUT Range with 0.1% Resolution
    • Read Back of Average and Peak Temperature, Current, and Voltage (25Hz Refresh Rate)
    • Fault Status
  • Phase-Lockable Fixed Frequency Up to 2MHz
  • Less Than 1ms Power-Up Time
  • Optional External Reference Input
  • Pin Selectable Fast-Margining of the Output Voltage
  • Power Good Flag with Pin Programmable Thresholds and Filter Delay
  • Differential Remote Output Voltage Sensing
  • Master Shutdown Mode: 125μA Supply Current
  • Clock Out for 2-Phase Operation (50A Load)
  • Available in a Thermally-Enhanced 6.25mm × 7.5mm × 2.22mm BGA Package

The LTC7131-1 is a high efficiency, 25A monolithic synchronous buck regulator using a phase lockable controlled on-time, current mode architecture. The output voltage is programmable with a single external resistor or an external voltage reference through the reference input (REF) pin. The output voltage can be margined up or down up to ±25% with 0.1% resolution via a PMBus-compliant serial interface. The serial interface can also be used to read back fault status and both time-averaged (~4ms) and peak input/output current, input/output voltage and temperature. System configuration and monitoring is supported by the LTpowerPlay® development system.

The architecture provides extremely fast response and allows operation at the very low on-times required to regulate low output voltages at high switching frequencies. The operating frequency is programmable from 250kHz to 2MHz with an external resistor or for noise sensitive applications, it can be synchronized to an external clock over the same range.

APPLICATIONS

  • Intelligent Energy Efficient Power Conversion
  • ASIC/FPGA/Processor Power
  • Point of Load Conversion
LTC7131-1
25A Monolithic Synchronous DC/DC Step-Down Converter with PMBus Interface
LTC7131-1 Application Circuit LTC7131-1 Performance Graph LTC7131-1 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

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Software Resources

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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC7131-1

LTpowerPlay®

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

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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

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schematic 1
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schematic 3
DC2824A-A

LTC7131-1 | 25A Monolithic Synchronous DC/DC Step-Down Converter with PMBus Interface

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Product Details

Demonstration circuit 2824A-A is a single output buck converter with 4.5V to 20V input voltage range featuring the LTC7131-1, a 25A monolithic synchronous stepdown converter with a PMBus interface. The output voltage is adjustable from 0.4V to 4V and the converter can supply up to 25A of load current.

The DC2824A-A powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication, which 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 USB-to-PMBus dongle DC1613A to connect to the board.

LTpowerPlay allows users to monitor fault status and real-time telemetry of input and output voltages, input and output current, and internal IC die temperature. Programmable parameters include device address, output voltage, on/off control, and fault response to output overvoltage and output overcurrent.

The LTC7131-1 data sheet gives a complete description of this part, its operation and application information and must be read in conjunction with this quick start guide for DC2824A-A.
DC2824A-A
LTC7131-1 | 25A Monolithic Synchronous DC/DC Step-Down Converter with PMBus Interface
DC2824A-A Evaluation Board DC2824A-A Evaluation Board - Top View DC2824A-A Evaluation Board - Bottom View

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