Altera FPGA Power Delivery: Design Guide

Start with the full Altera ordering code #

An Altera FPGA power tree is not selected from a family logo. It is selected from the exact ordering part number (OPN), package, enabled transceiver tiles, I/O standards, memory topology, clock activity, logic utilization and thermal environment. The suffix is particularly important on newer families because it can identify a SmartVID or fixed-voltage power option.

Altera is again the current independent FPGA company and brand. Intel remains visible in older device handbooks, reference-design titles, board files and top markings, so engineers and buyers should treat “Intel FPGA” in legacy collateral as historical document context rather than a different compatible device manufacturer. The OPN, revision and official change notices remain the controlling identifiers.

Compare two current development-board examples. The Agilex 7 F-Series kit uses AGFB014R24B2E2V; its final V denotes a SmartVID power option. Agilex 5 boards document both A5ED065AB32AE1V and A5ED065BB32AE4S, illustrating that devices in one family may use VID (V) or fixed-voltage (S) options. A quote for “Agilex 5 065” is therefore not enough to freeze the electrical design or the purchasing line.

Before choosing a regulator, record:

• the complete FPGA OPN and package;
• whether the OPN is a SmartVID or fixed-voltage option;
• the Power and Thermal Calculator or Early Power Estimator input assumptions;
• the Quartus Power Analyzer result when the design is mature enough;
• the exact transceiver, HPS, memory and I/O-bank population;
• input-bus limits, ambient temperature, airflow and board area;
• required telemetry, fault logging and field-service access.

The family changes the power-management problem #

The current Altera power-support hub covers Agilex 3, Agilex 5, Agilex 7, Stratix 10, Arria 10 and Cyclone 10. MAX 10 has a separate power-management guide and remains important for compact control and sequencing designs. These families do not share one universal rail list or start-up rule.

The examples above are not suggested substitutes for one another. They show why procurement must retain the whole OPN. Speed grade, package, temperature grade, power option and optional suffix can change voltage, qualification or lifecycle context even when the base density looks similar.

Build the rail table before the BOM #

The diagram is a LimChip conceptual view, not a copy of an Altera or regulator-vendor schematic. The exact names and allowed rail sharing must come from the pin-connection guide for the selected OPN.

Input conversion and protection #

Define the real input before sizing point-of-load converters: USB-PD, 5 V, 12 V, PCIe slot plus auxiliary input, or an industrial 24 V bus create different surge, inrush, reverse-polarity and EMI requirements. Altera's Agilex 7 F-Series development kit, for example, requires both its PCIe-slot 12 V and auxiliary 12 V sources in installed-card operation, while it can use an external supply in bench mode. A production board can use a different front end, but its power-good and fault behavior must still support the FPGA sequence.

Core and processor domains #

VCC and VCCP are central rails in Agilex power documentation. HPS-enabled devices add processor-system domains; SDM-related rails support configuration and management. These rails can have different current, ripple and sequencing jobs even when a reference board groups several loads behind one converter. Current must come from the project estimate, not from the maximum headline capability of a development kit.

Transceiver, PLL and clock rails #

High-speed tiles create sensitive analog and clocking rails. In the published Agilex 7 F-Series ADI power tree, separate functions include VCCA_PLL, HSSI/tile rails and clock-related supplies. That reference uses devices such as LTM4657, LTM4678, LTM4686-1 and LTM4623 for different rail groups. This is evidence for the named development-kit architecture, not permission to consolidate or substitute rails on another package without the applicable pin guide and PDN analysis.

I/O, memory and housekeeping #

I/O-bank voltage follows the selected I/O standards. HPS and external DDR can add memory voltage, termination and reference requirements. Always include configuration flash, clocks, fans, optical modules, USB-PD controllers and board-management logic in the system power budget. A power tree that covers only the FPGA pins can still under-size the input stage.

SmartVID is a configuration dependency #

SmartVID allows a supported FPGA to identify an operating voltage and communicate it to the regulator through PMBus under management of the Secure Device Manager. On SmartVID OPNs, the regulator is part of the FPGA configuration path, not merely a source with a close nominal voltage.

Altera's current SmartVID landing page lists these relevant OPN suffix groups:

• Agilex 7 F- and I-Series: V, E and X;
• Agilex 7 M-Series: V and E;
• Agilex 5: the landing page lists V, E, S and X;
• Stratix 10: V.

For Agilex 5, that landing-page list conflicts with the more specific current device data sheet. The data sheet explicitly defines V as standard-power VID, E as low-power VID, S as standard-power fixed voltage and X as low-power fixed voltage. This guide therefore treats only V and E as Agilex 5 VID options; it does not infer a PMBus SmartVID requirement for S or X devices from the landing-page bullet. Resolve the final implementation from the exact OPN, current family data sheet, power-management guide and Quartus settings. Do not apply a suffix rule from one family to another.

Altera also publishes two regulator evidence levels. “Fully validated” parts are regression-tested for every Quartus Prime Pro release; “API validated only” parts are known to be compatible with the SDM power-management API but are not stated to be physically tested. As of the cited July 2026 page, fully validated examples include LTC3888-1, LTM4677, ISL682xx, ISL69260, XDPE12284C and MPM3698 for Agilex 7; TPS53676, LTC3882-1 and ISL68223 for Agilex 5; and LTM4677 for Stratix 10. The page must be rechecked at design release because the table is tied to current Quartus validation.

Vendor Reference Design

The ADI Agilex 7 F-Series development-kit circuit note provides a concrete example. It maps LTC3888-1 plus LTC7051 stages to high-current core functions and uses additional µModule regulators for tile, HPS, PLL, I/O and memory rails. ADI also publishes monolithic and µModule alternatives. These are documented alternatives for that board context, not a general cross-compatible parts list.

For PMBus target mode, Altera's checklist calls out PWRMGT_SCL, PWRMGT_SDA and PWRMGT_ALERT, 1.8 V FPGA-side pull-ups and a bidirectional level shifter where the regulator bus is 3.3 V. The Quartus address, data format and commands must match the physical regulator. Incorrect pins, address or VID parameters can stop configuration and force a board spin.

Sequence by documented groups, not delays alone #

Agilex 3 and Agilex 5 power guides divide rails into Group 1, Group 2A and Group 2B. Every Group 1 rail must reach at least 90% of nominal before Group 2A begins; Group 2A must reach the same threshold before Group 2B begins. Rails inside a group may ramp in any order. All rails must ramp monotonically and meet the applicable power-on-reset timing. Altera recommends reversing the order at power-down for lowest supply current on these families.

This is more precise than “turn core on first.” The actual group membership includes core/SDM/HPS and transceiver-related rails in Group 1, additional analog/configuration rails in Group 2A and selected I/O-related rails in Group 2B. Group membership varies by family and package, so the design file should cite the exact power-guide revision.

Altera's AN 692 adds the system fault case. A controlled design can use a programmable controller or a multiple-supply sequencer. For uncontrolled input loss, the note recommends loss-of-power detection, enough hold-up energy to keep management alive, reset logic to reduce FPGA consumption and rapid discharge for each power group. This means the BOM may need a supervisor, sequencer, discharge FETs and hold-up capacitor even if each regulator already has an enable pin.

For a review, capture four oscilloscope cases at the FPGA pins or designated sense points:

1. cold power-up at minimum and maximum input; 2. commanded power-down; 3. brownout or abrupt input removal; 4. restart after a latched regulator or SmartVID fault.

The acceptance record should show voltage thresholds, ramp monotonicity, group order, reset behavior and the state of externally driven I/O while the FPGA bank is unpowered.

Monitoring is part of design verification #

Agilex 3, 5 and 7 power guides document voltage and temperature monitoring systems. Development boards also demonstrate board-level monitoring: the Agilex 7 F-Series kit exposes power-monitor tools, while Stratix 10 boards use MAX-family devices for sequencing and monitoring. A production design can choose a different controller, but it needs an explicit observability plan.

At minimum, decide how the system will record:

• input voltage and current;
• high-current core voltage, current and regulator temperature;
• critical transceiver or PLL rails;
• FPGA local temperature and any remote diode measurement;
• PMBus faults, retry state and configuration errors;
• power-good timing relative to reset and configuration completion.

Monitoring does not replace probing. Remote sense, PMBus telemetry and an ADC can disagree because they observe different points and bandwidths. Use high-bandwidth probes for ripple and transient compliance, and document where every reading was taken.

Reference designs: use the evidence boundary #

Hardware Verified

Reference designs answer “has this architecture been built and measured?” They do not answer “is every original component still the best choice for a 2026 production BOM?” Check active status, recommended-for-new-design status, PCN/PDN history, firmware tool support and qualification for every orderable suffix. Do not shorten LTC3888-1 to LTC3888, or treat an automotive/industrial grade as interchangeable with a commercial grade.

The official Altera SmartVID list also prevents false symmetry. Renesas/ISL and MPS devices appear in the validated Agilex regulator table, but that alone is not evidence of a complete, named Altera board reference design covering every family. This guide therefore does not invent a matching Renesas or MPS Altera power tree. A later vendor comparison should list only the families and boards for which first-party evidence is available.

BOM and RFQ release checklist #

Engineering package #

• Freeze the complete FPGA OPN, package and board revision.
• Attach the Power and Thermal Calculator/EPE inputs and the latest Quartus Power Analyzer report.
• Include the rail worksheet with voltage, tolerance, current, sequence, sharing and monitoring requirements.
• Identify SmartVID mode, validated regulator model, PMBus address, level shifting and Quartus configuration.
• Link each borrowed circuit to its source reference design and state what was changed.
• Archive the PDN-tool result, schematic, layout constraints and bench waveforms.

Procurement package #

• Use full orderable codes for FPGA, controllers, power stages, modules, sequencers and supervisors.
• Record programmed or OTP configuration, PMBus address and required firmware/configuration files.
• Confirm package, temperature grade, qualification, moisture sensitivity, packing method and date-code rule.
• Check lifecycle and change notices for mature Arria 10, Cyclone 10 and MAX 10 reference-design parts.
• Keep approved alternates rail-specific; “same voltage/current” is not a valid alternate rule.
• Ask for lot traceability and preserve the reel/tray labels for incoming inspection.

RFQ inputs #

Send the exact FPGA OPN, annual and build quantity, input bus, rail table, qualification requirement and production horizon. For SmartVID rails, include the validated regulator code and configuration constraints. For a copied evaluation-board BOM, identify the board revision and list the components engineering has already approved for replacement.

Conclusion #

Altera FPGA power design is a controlled chain: exact OPN, estimated load, family-specific rails, documented sequence, SmartVID-compatible control where required, validated PDN and traceable production BOM. Agilex 7 and Agilex 5 make the regulator-to-SDM interface especially visible; Agilex 3, Stratix 10, Arria 10, Cyclone 10 and MAX 10 each retain their own electrical and lifecycle boundaries.

For the equivalent AMD platform workflow, read AMD-Xilinx FPGA Power Delivery: Design Guide. The two guides use the same procurement discipline but deliberately keep vendor rail names, sequencing rules and reference-design evidence separate.

Before requesting stock, send the FPGA OPN, power estimate, input bus, rail table and qualification requirements. Those files are what allow a distributor and engineering team to distinguish an approved regulator from a merely plausible one.

Official references #

• Altera FPGA Power Solutions Resources
• Altera FPGA SmartVID and validated voltage-regulator list
• Altera Agilex 7 Power Management User Guide
• Altera Agilex 5 Power Management User Guide
• Altera Agilex 5 FPGAs and SoCs Device Data Sheet
• Altera Agilex 3 Power Management User Guide
• Altera AN 692: Power Sequencing Considerations
• Altera Agilex 7 F-Series Development Kit
• Altera Agilex 5 E-Series Development Kit device examples
• Altera Agilex 3 C-Series Development Kit
• Altera Stratix 10 GX Development Kit
• Altera Arria 10 GX Development Kit
• Altera Cyclone 10 GX 10CX085 product ordering page
• Analog Devices Agilex 7 F-Series development-kit power tree
• Analog Devices Arria 10 FPGA development-kit power design
• Texas Instruments TIDA-01419 Arria 10 GX core reference design
• Texas Instruments TIDA-00607 MAX 10 power reference design
• Altera closes Silver Lake investment and becomes independent