ADM1276
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ADM1276

Hot Swap Controller and Digital Power and Energy Monitoringwith PMBus Interface

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Part Details
Part Models 2
1ku List Price Starting From $6.23
Features
  • Controls supply voltages from
    2 V to 20 V
  • 370 ns response time to short circuit
  • Resistor-programmable 5 mV to 25 mV current limit
  • ±1% accurate, 12-bit ADC for current, VIN/VOUT readback
  • Charge pumped gate drive for multiple external N-channel FETs
  • High gate drive voltage to ensure lowest RDSON
  • Foldback for tighter FET SOA protection
  • Automatic retry or latch-off on current fault
  • Programmable current-limit timer for SOA
  • See data sheet for additional features
Additional Details
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The ADM1276 is a hot swap controller that allows a circuit board to be removed from or inserted into a live backplane. It also features current and voltage 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 SENSE+ and SENSE− pins. A default limit of 20 mV is set, but this limit can be adjusted, if required, using a resistor divider network from the internal reference voltage to the ISET pin.

The ADM1276 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 ADM1276 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 foldback resistor network can be used to actively lower the current limit as the voltage across the FET is increased. This helps to maintain constant power in the FET and allows the safe operating area (SOA) to be adhered to in an effective manner.

In case of a short-circuit event, a fast internal overcurrent detector responds within 370 ns and signals the gate to shut down. A 1500 mA pull-down device ensures a fast FET response. The ADM1276 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 FLB pin to monitor the output. GPO pins can be configured as various output signals that can be asserted when a programmed current or voltage level is reached.

The 12-bit ADC can measure the current in the sense resistor, as well as the supply voltage on the SENSE+ pin or the output voltage. A PMBus interface allows a controller to read current and voltage data from the ADC. Measurements can be initiated by a PMBus command. Alternatively, the ADC can run continuously, and the user can read the latest conversion data whenever required. As many as four unique PMBus addresses can be selected, depending on the way that the ADR pin is connected.

The ADM1276 is available in a 20-lead LFCSP and has a LATCH pin that can be configured for automatic retry or latch-off when an overcurrent fault occurs.

APPLICATIONS

  • Power monitoring and control/power budgeting
  • Central office equipment
  • Telecommunication and data communication equipment
  • PCs/servers
Part Models 2
1ku List Price Starting From $6.23

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
ADM1276-3ACPZ
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ADM1276-3ACPZ-RL
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Product Lifecycle

PCN

Aug 6, 2014

- 13_0230

Assembly and Test Transfer of Select 3.5x3.5, 4x3, 4x4, and 5x5mm LFCSP Products to STATS ChipPAC China

Dec 9, 2013

- 13_0287

Change in Gate Drive Specification Condition for ADM1276 product

ADM1276-3ACPZ

ADM1276-3ACPZ-RL

Mar 28, 2023

- 23_0037

Discontinuance of ADM1276 Products

ADM1276-3ACPZ

ADM1276-3ACPZ-RL

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Aug 6, 2014

- 13_0230

arrow down

Assembly and Test Transfer of Select 3.5x3.5, 4x3, 4x4, and 5x5mm LFCSP Products to STATS ChipPAC China

Dec 9, 2013

- 13_0287

arrow down

Change in Gate Drive Specification Condition for ADM1276 product

ADM1276-3ACPZ

ADM1276-3ACPZ-RL

Mar 28, 2023

- 23_0037

arrow down

Discontinuance of ADM1276 Products

ADM1276-3ACPZ

ADM1276-3ACPZ-RL

Evaluation Kit

Evaluation Kits 1

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