Powering Altera Agilex 3, 5 and 7 FPGAs

The family name is not a power specification #

Agilex 3, Agilex 5 and Agilex 7 sit at different points in Altera's current FPGA portfolio, but density is not the only difference that matters to power engineers. The exact ordering part number (OPN) determines the device series, package, speed or power grade and, on families that support it, whether the core is a SmartVID or fixed-voltage implementation. Transceiver tiles, HPS use, memory interfaces, I/O standards, configuration mode and the implemented workload then determine which rails exist and how much current they require.

Three current development platforms show why a buyer should never quote only “Agilex” plus a density:

The board OPNs are evidence examples, not a complete ordering guide. Production engineering must decode the selected OPN against the current device overview, data sheet, pin-connection guide and device pin-out. Procurement must carry the full code through AVL, purchase order and incoming inspection.

The closest existing article is Altera FPGA Power Delivery: Design Guide. That guide covers the whole Altera portfolio and the requirements-first workflow. This article is deliberately narrower: it compares the three current Agilex generations, their order-code power options, named rail groups and regulator evidence so an engineer or buyer can decide which BOM controls change when a project moves between Agilex 3, 5 and 7.

Agilex 3: fixed voltage does not mean one simple rail #

Altera's current Agilex 3 power-management guide states that the family offers fixed-voltage devices. For the documented –6S and –7S conditions, the data sheet lists VCC and VCCP nominal values of 0.78 V and 0.75 V respectively. The pin-connection guide says VCC and VCCP must operate at the same voltage, should share the same board plane and must be sourced from the same regulator. That is a useful opportunity to reduce regulator count, but it does not collapse the rest of the device into a single supply.

An Agilex 3 C-Series design can still include:

• VCC/VCCP for core and periphery;
• SDM rails such as VCCL_SDM, VCCPLLDIG_SDM, VCC_IO_SDM and VCCIO_SDM;
• VCCPT and VCCADC-related functions;
• HPS core, PLL and I/O rails on SoC devices;
• GTS transceiver rails on packages that contain those resources;
• HSIO/HVIO bank supplies selected by the actual I/O standards;
• LPDDR4 or other board-memory rails, plus configuration, clock and peripheral loads.

The official Agilex 3 C-Series development-kit material identifies MPQ2287GLE as the MPS voltage regulator used for FPGA core power. MPS documents MPQ2287 as a configurable synchronous buck with a PMBus interface; the complete orderable code includes an OTP configuration identifier and packing suffix. That makes it a useful board-level example, not a universal Agilex 3 prescription. A custom design must recalculate current, transient response, output capacitance and thermals, and the released BOM must preserve the programmed variant rather than shortening it to “MPQ2287.”

Agilex 3 also provides VCCLSENSE and GNDSENSE differential remote-sense pins for the VCC regulator. Remote sense corrects distribution loss at the intended point, but only when the Kelvin routing, regulator input range and compensation remain valid. It does not compensate for an under-sized converter or poor PDN.

Agilex 5: decide SmartVID versus fixed voltage first #

Agilex 5 creates the most likely ordering mistake in this three-family comparison because one family includes two distinct core-power behaviors. The current power-management guide separates D-Series and E-Series Group A SmartVID devices from E-Series Group B fixed-voltage devices. Its detailed SmartVID section is explicit: V and E power options support SmartVID; S and X are fixed-voltage options in the applicable Group B context.

For a SmartVID OPN such as A5ED065AB32AE1V:

• VCC and VCCP require a dedicated PMBus-compliant voltage regulator connected to that Agilex 5 device;
• PWRMGT_SCL and PWRMGT_SDA are required in controller and target operating modes;
• PWRMGT_ALERT is additionally required when the Agilex device operates as the PMBus target;
• the PMBus signals use the documented 1.8 V single-ended interface;
• the device powers VCC/VCCP initially at 0.80 V, then the SDM communicates the factory-programmed VID value to the external regulator or system controller.

For a fixed-voltage Group B OPN such as A5ED065BB32AE6S, do not populate a SmartVID control path by analogy. Select and set the fixed core voltage from the exact data sheet and power option, while still meeting the same package-pin tolerance, monotonic-ramp, remote-sense and PDN requirements.

This distinction must appear in both the schematic release and the purchasing record. An RFQ line that says “A5E065” leaves open the electrical architecture, package, speed/power grade and qualification context.

Validated Agilex 5 core-power starting points #

Altera's current Agilex 5 PCB design guide lists controller-and-stage combinations whose PMBus communication has been qualified for the VID application:

The same guide says the LTC7883/LTC7051 implementation has been tested on development kits. The 065B premium-kit schematic provides a concrete fixed-voltage board example: LTC7883AY#PBF controllers drive named rail groups, including VCC core phases and GTS-related rails. That evidence does not mean every Agilex 5 board needs the same controller count, phase allocation, switching frequency or output network.

Keep the evidence layers separate. “Qualified for VID communication” verifies the control interface under Altera's stated scope. “Used on a development kit” adds board evidence for that platform. Neither replaces the Power and Thermal Calculator result, package-pin transient limits, PDN simulation, thermal validation or production fault test for the new board.

Agilex 7: tile selection expands the power tree #

Agilex 7 spans F-Series, I-Series and M-Series devices with different transceiver and memory resources. The current power-management guide states that SmartVID standard-power devices are offered in all speed grades, while fixed-voltage devices are limited to the –4 speed grade. Altera's SmartVID resource identifies F-Series and I-Series V, E and X options and M-Series V and E options in its SmartVID family set. The exact OPN and family data sheet remain controlling; do not infer behavior from the final character alone without the applicable ordering table.

The AGFB014R24B2E2V development-kit device is a useful high-density example. Its power system has core and HPS domains plus separate P-Tile and E-Tile rails. Altera's Agilex 7 PDN guide lists validated controller/power-stage combinations for the VCC/VCCP core, including MPS MP2975/MP2972 with MP86956A, Renesas ISL68236 with ISL99227, and ADI LTC3888-1 with LTC7051.

ADI publishes a detailed circuit note for the same F-Series P-Tile/E-Tile development-kit class. Its named roles include:

This is a vendor-reference-design and development-platform BOM, not an approved substitute list for every Agilex 7. A different tile mix, package or workload can change both the rail set and the required phase count. The device power estimate and current pin guide must remain attached to any reused circuit block.

Sequencing is a threshold relationship, not a delay script #

All three families group rails for power-up, but the group contents are device-specific. A sequencer should advance because the earlier group has reached its documented threshold, not merely because a timer expired.

For Agilex 3 and 5, Altera recommends reversing the power-up sequence during power-down to minimize supply current. For Agilex 7 F/I devices, the guide gives no mandatory general power-down sequence except for devices with E-Tile, though reverse order is recommended for devices without E-Tile. E-Tile devices have additional rail-order conditions and the guide requires all rails to power down fully within 100 ms. Agilex 7 M-Series has its own power-down requirements. Copying the three-box power-up diagram without these exceptions is incomplete.

The production test should capture rail waveforms at the FPGA package or qualified sense points. Record monotonicity, group thresholds, total ramp time, POR behavior, discharge, brownout response and the state of externally driven I/O while banks are unpowered. If configuration via protocol is used, verify the applicable total-ramp limit from the selected family data sheet rather than assuming the board's normal boot timing is sufficient.

Monitoring and fault ownership belong in the BOM #

Agilex devices include voltage and temperature sensing resources, but the system still needs an explicit monitoring architecture. The design release should state which device owns each action:

• the FPGA SDM for SmartVID communication and device-level fault reporting;
• the regulator controller for telemetry, margining, current limit and stored configuration;
• a board-management controller for sequence orchestration, logging and recovery policy;
• supervisors or load switches for rails that cannot safely depend on firmware;
• the host or service processor for reporting field events.

For SmartVID, configuration data is part of the electrical BOM. Preserve PMBus address, operating mode, VOUT format and coefficients, startup value, alert wiring, firmware or NVM image, checksum and the approved programming procedure. Altera warns that an incorrect regulator choice or coefficient can prevent device configuration.

For fixed-voltage devices, do not discard monitoring merely because VID is absent. VCC remote sense, rail tolerance, transient response and temperature still matter. A fixed output may simplify the control plane, but it does not remove the need to prove the supply at the package pins across load, process, input and temperature.

Convert the reference design into a controlled BOM #

Start with the exact FPGA OPN and a current power estimate, then release each power component by complete orderable code. The following fields prevent the most common engineering-to-procurement loss of information:

Do not substitute a controller because another device supports PMBus. The command set, coefficients, alert behavior, NVM image and FPGA firmware compatibility all require review. Do not substitute a power stage solely on current rating; PWM logic, current/temperature telemetry, footprint, thermal impedance, switching behavior and controller compensation must match.

Engineering and purchasing release checklist #

1. Freeze the full Agilex OPN, package, device status and intended configuration mode. 2. Identify fixed-voltage or SmartVID behavior from the current family data sheet and power guide. 3. Generate the Power and Thermal Calculator estimate with the real logic, clocks, HPS, memory, transceiver and I/O assumptions. 4. Build a rail table with voltage, tolerance, static and dynamic current, sequence group, ripple, remote-sense and monitoring requirements. 5. Use the package pin guide to approve every merged rail and every unused-bank or unused-tile connection. 6. Select the closest evidence-backed controller, stage or regulator architecture, while retaining its exact target and validation boundary. 7. Simulate the PDN and validate transient, startup, shutdown, fault and thermal behavior on hardware. 8. Release complete power-device OPNs, programmed variants, configuration checksums and test limits to procurement. 9. At RFQ, state production quantity, qualification grade, date-code policy, packing, traceability and allowed substitutions. 10. Re-run engineering approval when the FPGA OPN, package, memory population, workload or any power component changes.

Conclusion #

Agilex 3, 5 and 7 do not form a simple low-, medium- and high-current ladder. Agilex 3 uses fixed core voltage but still has a multi-domain, sequenced power system. Agilex 5 makes the SmartVID-versus-fixed OPN decision central to the schematic and purchasing line. Agilex 7 adds tile- and series-dependent rails, higher-density controller/stage architectures and additional shutdown exceptions.

Use Altera FPGA Power Delivery: Design Guide for the portfolio-wide workflow and legacy-family boundaries. For a cross-vendor system methodology, see AMD-Xilinx FPGA Power Delivery: Design Guide; for a detailed example of how one power vendor's orderable devices map to FPGA rails and evidence levels, read ADI Power Solutions for AMD-Xilinx FPGAs.

For an Agilex power-tree RFQ, send the full FPGA OPN, power estimate, input bus, rail table, regulator configuration and target quantity. LimChip can then source the controlled BOM while electrical equivalence and substitution approval remain with the engineering owner.

Official references #

• Altera Agilex 3 Power Management User Guide
• Altera Agilex 3 Device Data Sheet Recommended Operating Conditions
• Altera Agilex 3 Pin Connection Guidelines: Power Supply Pins
• Altera Agilex 3 C-Series Development Kit
• Altera Agilex 3 Development Kit I2C Device Table
• MPS MPQ2287 Product Page and Data Sheet
• Altera Agilex 5 Power Management User Guide
• Altera Agilex 5 Power-Up Sequence Requirements
• Altera Agilex 5 Core Fabric Voltage-Regulator Selection
• Altera Agilex 5 E-Series 065A Modular Development Kit
• Altera Agilex 5 E-Series 065B Premium Development Kit Schematic
• Altera Agilex 7 Power Management User Guide
• Altera Agilex 7 Power-Up Sequence Requirements
• Altera Agilex 7 Core Fabric Voltage-Regulator Selection
• Altera FPGA SmartVID and Validated Regulator List
• Altera Agilex 7 F-Series P-Tile and E-Tile Development Kit
• Analog Devices Agilex 7 F-Series Development-Kit Power Tree