1. Products
  2. Power Monitor, Control, and Protection
  3. Hot Swap Controllers
  4. Low Voltage Hot Swap Controllers
  5. ADM1278

Data Sheet Rev. C
User Guides
2 View All
Evaluation Software
2 View All

Overview

Features and Benefits

  • ±0.3% accurate, 12-bit ADC for IOUT, VIN, VOUT, and temperature
  • 320 ns response time to short circuit
  • Shutdown on detection of FET health fault
  • Constant power foldback for tighter FET SOA protection
  • Remote temperature sensing with programmable warning and shutdown thresholds
  • Resistor-programmable 5 mV to 25 mV VSENSE current limit
  • Programmable start-up current limit
  • 1% accurate UV, OV, and PWRGD thresholds
  • Split hot swap and power monitor inputs to allow additional external ADC filtering
  • Reports power and energy consumption over time
  • Peak detect registers for current, voltage, and power
  • PROCHOT power throttling capability
  • PMBus fast mode compliant interface
  • 5 mm × 5 mm, 32-lead LFCSP

Product Details

The ADM1278 is a hot swap controller that allows a circuit board to be removed from or inserted into a live backplane. It also features current, voltage, power, and temperature readback via an integrated 12-bit analog-to-digital converter (ADC), accessed using a PMBus™ interface. The load current is measured using an internal current sense amplifier that measures the voltage across a sense resistor in the power path via the HS+ and HS− pins. A default current limit of 20 mV is set, but this limit can be adjusted, if required.

The ADM1278 limits the current through the sense resistor by controlling the gate voltage of an external N-channel FET in the power path, via the GATE pin. The sense voltage, and therefore the load current, is maintained below the preset maximum. The ADM1278 protects the external FET by limiting the time that the FET remains on while the current is at its maximum value.

This current-limit time is set by the choice of capacitor connected to the TIMER pin. In addition, a constant power foldback scheme is used to control the power dissipation in the MOSFET during power-up and fault conditions. The level of this power, along with the TIMER regulation time, can be set to ensure that the MOSFET remains within safe operating area (SOA) limits.

In case of a short-circuit event, a fast internal overcurrent detector responds within 320 ns and signals the gate to shut down. A 1500 mA pull-down device ensures a fast FET response.

The ADM1278 features overvoltage (OV) and undervoltage (UV) protection, programmed using external resistor dividers on the UV and OV pins. A PWRGD signal can be used to detect when the output supply is valid, using the PWGIN pin to accurately monitor the output.

The ADM1278 is available in a 32-lead LFCSP with a RETRY pin that can be configured for automatic retry or latch-off when an overcurrent fault occurs.

Applications

  • Servers
  • Power monitoring and control/power budgeting
  • Telecommunication and data communication equipment 

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Product Lifecycle icon-recommended 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 (1)

Documentation & Resources

  • View All (7)
  • Data Sheets (1)
  • Application Notes (2)
  • User Guides (2)
  • Product Selector Card (1)
  • Videos (1)
    • Document Type

    Software & Systems Requirements

    Evaluation Software

    Hot-Swap & Power Monitoring Evaluation Software

    ZIP

    HS-PM Evaluation Software Installer (Ver 1.5.2)

    A configuration and programming tools for use with the PMBus enabled hot swap and power monitoring parts. This version of software supports Windows XP, Windows Vista, and Windows 7.
    RTF

    ReadMe for HS-PM Installer

    ADMxxxx Common Run-Time

    ZIP

    ADMxxxx Run-time Installer

    This file only needs to be downloaded and installed once for all tools that share it.

    Read Me for ADMxxxx Common Run-Time Installer

    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.

    LTspice

    Models for the following parts are available in LTspice:

    ADM1278

    Design Tools

    ZIP
    780.24 K
    ADM1278 Design Worksheet Tool

    Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications

    Hot-Swap & Power Monitoring Evaluation Software

    Requires the ADMxxxx Common Run-time v3.0 to be installed in order to provide driver support for the USB-SMBUS-CABLEZ and USB-SDP-CABLEZ interface connectors.

    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
    ADM1278-1AACPZ Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-1AACPZ-RL Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-1ACPZ Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-1ACPZ-RL Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-1BCPZ Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-1BCPZ-RL Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-2ACPZ Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-2ACPZ-RL Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-3ACPZ Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    ADM1278-3ACPZ-RL Material Declaration Reliability Data 32-Lead LFCSP (5mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data

    Support & Discussions

    ADM1278 Discussions

    RE: Simulation model for ADM1278
    RE: Reference circuit for LTC4215
    All ADM1278 Discussions
    ADM1278 Contact ADI Technical Support »
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    ADM1278 Contact ADI Technical Support » ADM1278 Ask your question »

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