ADM1178

热插拔控制器和数字电源与AlertB输出监视器 Hot Swap Controller and Digital Power Monitor with AlertB Output

Product Details

The 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 measures 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 via the GATE pin of an external N-channel FET in the power path. The voltage across the sense resistor and therefore the inrush current is kept below a preset maximum.

The ADM1178 protects the external FET by limiting the time that the maximum current runs through it. This current limit period is set by the value of the 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 how the ADR pin is connected.

The ADM1178 is packaged in a 10-lead MSOP.

**Applications**

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Power monitoring/power budgeting

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Central office equipment

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Telecommunication and data communication equipment

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PCs/servers

### Features and Benefits

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Allows safe board insertion and removal from a live backplane

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Controls supply voltages from 3.15 V to 16.5 V

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Precision current sense amplifier

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Precision voltage input

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12-bit ADC for current and voltage readback

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Charge-pumped gate drive for external N-channel FET

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Adjustable analog current limit with circuit breaker

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Please see data sheet for additional features.