ADM1178:  Hot Swap Controller and Digital Power Monitor with ALERTB Output

The ADM1178 is an integrated hot swap controller and current sense amplifier that offers digital current and voltage monitoring via an on-chip, 12-bit analog-to-digital converter (ADC), communicated ...More

ADM1178:  Hot Swap Controller and Digital Power Monitor with ALERTB Output

Product Description

The ADM1178 is an integrated hot swap controller and current sense amplifier that offers digital current and voltage monitoring via an on-chip, 12-bit analog-to-digital converter (ADC), communicated through an I2C interface.

An internal current sense amplifier senses voltage across the sense resistor in the power path via the VCC pin and the SENSE pin.

The ADM1178 limits the current through this resistor by control-ling the gate voltage of an external N-channel FET in the power path, via the GATE pin. The sense voltage (and, therefore, the inrush current) is kept below a preset maximum.

The ADM1178 protects the external FET by limiting the time that it spends with the maximum current running in it. This current limit period is set by the choice of capacitor attached to the TIMER pin. Additionally, the device provides protection from overcurrent events that may occur after the hot swap event is complete. In case of a short-circuit event, the current in the sense resistor exceeds an overcurrent trip threshold, and the FET is switched off immediately by pulling down the GATE pin.

A 12-bit ADC can measure the current seen in the sense resistor, as well as the supply voltage on the VCC pin. An alert output can be set to trigger when the ADC current reading exceeds a programmed overcurrent limit threshold.

An industry-standard I2C interface allows a controller to read current and voltage data from the ADC. Measurements can be initiated by an I2C command. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever it is required. Up to four unique I2C addresses can be created, depending on the way the ADR pin is connected.

The ADM1178 is packaged in a 10-lead MSOP.

Applications

  • Power monitoring/power budgeting
  • Central office equipment
  • Telecommunication and data communication equipment
  • PCs/servers

    • Data Sheet, Rev. B, 2/08

    Features

    • Allows safe board insertion and removal from a live backplane
    • Controls supply voltages from 3.15 V to 16.5 V
    • Precision current sense amplifier
    • Precision voltage input
    • 12-bit ADC for current and voltage readback
    • Charge pumped gate drive for external N-channel FET
    • ALERTB output for overcurrent interrupt
    • Adjustable analog current limit with circuit breaker
    • ±3% accurate hot swap current limit level
    • Fast response limits peak fault current
    • Automatic retry or latch-off on current fault
    • Programmable hot swap timing via TIMER pin
    • Active-high ON pin
    • I2C fast mode-compliant interface (400 kHz maximum)
    • 10-lead MSOP

    Diagrams

    ADM1178 Diagram
    Functional Block Diagram for ADM1178

    技术指标

    Other Outputs ALERTB
    Package 10-Lead MSOP
    UV & OV Detection ON pin (UV)
    Digital V & I Readback I2C Interface,w/ 4 Addreses
    Operating Range(V) 3.15 to 16.5

    浏览其他的产品

    Part# Operating Range(V) UV & OV Detection Digital V & I Readback Other Inputs Other Outputs Package Price* (1000-4999)
    ADM1170 1.6 to 16.5 ON pin (UV) - - - 8 ld TSOT $2.13
    ADM1171 2.7 to 16.5 ON pin (UV) - - CS_OUT 8 ld TSOT $2.23
    ADM1172 2.7 to 16.5 ON pin (UV) - PFI PFO 8 ld TSOT $2.02
    ADM1175 3.15 to 16.5 ON pin (UV), ONB pin (OV) I2C Interface, w/ 4 Addreses CONV Pin - 10-Lead MSOP $2.53
    ADM1176 3.15 to 16.5 ON pin (UV) I2C Interface, w/ 16 Addresses - - 10-Lead MSOP $2.53
    ADM1177 3.15 to 16.5 ON pin (UV) I2C Interface, w/ 4 Addreses - - 10-Lead MSOP $2.53
    ADM1178 3.15 to 16.5 ON pin (UV) I2C Interface, w/ 4 Addreses - ALERTB 10-Lead MSOP $2.73
    ADM4210 2.7 to 16.5 ON pin (UV) - - - 6-ld TSOT $3.02

    * The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
    ** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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