ADM1276-3ACPZ Low Voltage Hot Swap Controllers by Analog Devices

Low Voltage Hot Swap Controllers
Status: Production
Series: ADM1276
RoHS: Compliant
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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.

Where to Buy

Prices starting from US$4.78

Distributor Stock
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Newark Electronics
from US$12.75
81
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element14
from US$11.05
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Farnell
from US$10.50
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Chip One Stop
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Analog Devices
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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

Alternative Descriptions

Hot-Swap Ctrl, -40 To 85Deg C, Lfcsp-20 | Newark Electronics
HOT-SWAP CTRL, -40 TO 85DEG C, LFCSP-20 | element14
Low volt Positive Hot Swap + P | Analog Devices

Frequently Asked Questions

Where can I find additional details, specifications and documents for a ADM1276-3ACPZ?

Additional datasheets, footprints and schematics for ADM1276-3ACPZ are listed on our Part Details page. You can also find images and similar parts to ADM1276-3ACPZ on this page.

What pricing and inventory information can I view?

Distributor pricing and stock information is available for ADM1276-3ACPZ on our Product Comparison page. Access via the 'View Pricing & Stock' button to view ADM1276-3ACPZ price breaks, MOQs, lead times, inventory and SKUs from distributors.

What category does ADM1276-3ACPZ fall under?

The ADM1276-3ACPZ is listed under Low Voltage Hot Swap Controllers.

Can I view similar or alternative parts?

You can view similar parts to ADM1276-3ACPZ when available in the Low Voltage Hot Swap Controllers range under the specifications section at the bottom of the details page.

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Is the ADM1276-3ACPZ RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

Which authorised distributors for ADM1276-3ACPZ have stock available?

Authorised distributors including Newark Electronics, element14, Farnell, Chip One Stop and Analog Devices have stock available or on a lead time for ADM1276-3ACPZ.

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