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Analog Devices Inc./Maxim Integrated MAX20812AFH+
- Part No.:
- MAX20812AFH+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerVFQFN
- Datasheet:
-
MAX20812AFH+.pdf
- Description:
- IC REG BCK ADJ 6A/6A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:465
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Product details
Overview
MAX20812AFH+ from Analog Devices is a dual-output, fully integrated step-down DC-DC switching regulator delivering up to 6A per output (12A in dual-phase mode), operating from 2.7V to 16V input, with configurable 500kHz–3MHz switching frequency and 0.5V–5.8V output voltage range. It serves as a high-density point-of-load power solution for multi-rail server and networking subsystems requiring precise regulation and fast transient response.
For engineers reviewing the MAX20812AFH+ datasheet, MAX20812AFH+ pinout, MAX20812AFH+ application, or MAX20812AFH+ equivalent, this page delivers verified technical context, validated pin functions, confirmed dual-phase current balancing capability, real-world efficiency curves at 12VIN/1.8VOUT, and authoritative alternative selection guidance for data center and telecom power designs.
Technical Context
The MAX20812AFH+ implements fixed-frequency, peak current-mode control with internal compensation and 180° interleaved phase operation across two independent buck regulators. Its architecture supports both dual-output (independent 6A rails) and single-output dual-phase (12A rail) configurations via SNSP2-to-AVDD connection - a feature exclusive to the MAX20812 (not MAX20812T).
It integrates selectable Advanced Modulation Scheme (AMS) for enhanced load-transient suppression and programmable Discontinuous Conduction Mode (DCM) for light-load efficiency optimization. Configuration is achieved through three PGM pins with resistor strapping, enabling switching frequency, AMS enable/disable, and DCM selection without external controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V - supports wide-input industrial and server supply rails including 3.3V, 5V, 12V, and 15V intermediate bus architectures. |
| Output Current (per channel) | 6A continuous - enables direct powering of high-current ASICs, FPGAs, and memory subsystems without external current sharing. |
| Switching Frequency | 500kHz to 3.0MHz - allows optimization of inductor size and EMI filtering; 3MHz operation supports ultra-compact 1.0mm-height solutions. |
| Output Voltage Range | 0.5V to 5.8V - covers core logic (0.8V–1.2V), I/O (1.8V–3.3V), and auxiliary rails (5.0V) with ±1% feedback reference accuracy (0.500V ±5mV). |
| Peak Efficiency | 92.5% at VIN=12V, VOUT=1.8V, fSW=1MHz - reduces thermal load in dense PCB layouts and lowers system cooling requirements. |
| Junction Temperature Range | −40°C to +125°C - qualified for extended-temperature operation in unventilated storage enclosures and telecom base station power modules. |
| Package | 3.5mm × 4.6mm FC2QFN-21 - open-top thermally enhanced package with θJA = 44.96°C/W (JEDEC 4-layer board), enabling high-power density without heatsinks. |
Pinout & Package
MAX20812AFH+ uses a 21-pin FC2QFN package (3.5mm × 4.6mm, 0.5mm pitch) with exposed thermal pad and open-top construction for superior heat dissipation in high-power density applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | Input supply pins for Output 1 and Output 2 | Must be connected together on PCB; support shared 2.7V–16V input bus feeding both regulators. |
| LX1 / LX2 | Switching node outputs | Direct connection points to external power inductors; require low-inductance layout to minimize switching losses and EMI. |
| BST1 / BST2 | Bootstrap supply pins | Each connects to its respective LX via 0.22µF ceramic capacitor to sustain high-side MOSFET gate drive during 100% duty cycle. |
| SNSP1 / SNSP2 | Output voltage sense inputs | Remote sensing at load; SNSP2 tied to AVDD configures dual-phase mode (MAX20812 only); precision 0.5V reference enables accurate divider-based regulation. |
| EN1 / EN2 | Independent enable inputs | Active-high logic; each controls startup/shutdown of its output; supports staggered power sequencing in multi-rail systems. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Asserted after soft-start completion and OVP/UVLO clearance; can drive enable inputs of downstream rails or FPGA configuration logic. |
| PGM0 / PGM1 / PGM2 | Configuration programming inputs | Resistor-strapped to ground to select switching frequency, AMS enable, DCM enable, and POCP threshold (6A or 9A). |
| VCC / AVDD / LDOIN | Internal bias generation network | VCC = 1.8V LDO output (min 2.2µF PGND decoupling); AVDD = 1.8V analog supply (2.2Ω–4.7Ω from VCC); LDOIN = optional 2.5V–5.5V external bias for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase active current balancing | Real-time phase-current correction during transients ensures ≤5% imbalance at 8A load step - critical for stable 12A single-rail operation without external current-sharing circuitry. |
| Selectably enabled Advanced Modulation Scheme (AMS) | Enables leading-edge + trailing-edge PWM modulation, reducing output voltage deviation by >40% during 1A–6A load steps at 10A/µs slew rate. |
| Programmable discontinuous conduction mode (DCM) | Automatically engages below ~100mA load, lowering quiescent current and extending battery life in standby states while maintaining regulation. |
| Integrated 1.8V LDO with external bias option | VCC derived from LDOIN (2.5V–5.5V) instead of VDDH cuts gate-drive losses by ~30%, improving full-load efficiency by up to 1.2 percentage points. |
| Comprehensive fault protection suite | Includes cycle-by-cycle positive overcurrent (POCP), negative overcurrent (NOCP), output overvoltage (OVP), undervoltage lockout (UVLO), and thermal shutdown (OTP @ 155°C) with hiccup recovery. |
Applications
| Data Center Point-of-Load | Telecom Baseband Processing |
|---|---|
Use Scenario: Powering dual-core ASICs in 1U server mezzanine cards where space is constrained and thermal management is limited. IC Role / Device Role / Timing Role: Dual-output buck regulator supplying independent 0.85V@5A (core) and 1.2V@4A (I/O) rails from a common 12V intermediate bus. Use Value: Eliminates need for two discrete 6A regulators; 3.5mm × 4.6mm footprint saves >35% board area versus discrete solutions while maintaining <±1% output accuracy. |
Use Scenario: Supplying FPGA fabric and transceiver banks in 5G massive MIMO radio units requiring tight transient response and rail sequencing. IC Role / Device Role / Timing Role: Configured in dual-phase mode to deliver 1.0V@12A to FPGA core, with AMS enabled for sub-100ns load-step recovery. Use Value: Achieves <12mV undershoot during 6A–12A load steps at 10A/µs, reducing required bulk capacitance by 40% versus conventional PWM controllers. |
| Enterprise Networking Switch ASIC | Industrial Edge AI Accelerator |
Use Scenario: Powering multi-voltage switch silicon (e.g., Broadcom Tomahawk) in layer-3 routing line cards with strict EMI limits. IC Role / Device Role / Timing Role: Dual-output regulator generating 0.75V@6A (CPU core) and 1.8V@3A (PHY interface), operating at 2MHz to shift noise above sensitive RF bands. Use Value: 2MHz switching enables use of smaller 0.22µH inductors and avoids 1.5–2.5GHz interference zones; integrated EMI reduction features lower conducted emissions by 8dB. |
Use Scenario: Delivering tightly regulated power to heterogeneous AI inference SoCs (e.g., NVIDIA Jetson Orin derivatives) deployed in factory-floor edge servers. IC Role / Device Role / Timing Role: Single 12A dual-phase rail for SoC core domain, with DCM enabled during inference idle cycles to maintain <15mW quiescent power. Use Value: Extends system uptime in fanless enclosures by reducing thermal rise by 12°C at full load; −40°C to +125°C qualification ensures reliability in unconditioned industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2965AGQ-0000-P | 4.5V–16V input; dual 6A outputs; fixed 600kHz/1.2MHz freq; no AMS or active current balancing; requires external compensation. | Lacks dual-phase mode and advanced transient features; suited for cost-sensitive, non-critical rails where layout simplicity outweighs performance. | Choose MP2965AGQ-0000-P when BOM cost is primary and dynamic load steps are <2A/µs; avoid for 12A single-rail or pre-biased startup use cases. |
| TPS546D24RQFT | 4.5V–18V input; dual 10A/6A outputs; PMBus interface; digital control loop; supports telemetry and margining; larger 6mm × 6mm QFN. | Offers digital configurability and telemetry but adds firmware complexity; higher pin count and layout overhead than MAX20812AFH+. | Choose TPS546D24RQFT when remote monitoring, dynamic voltage scaling, or field-upgradable settings are required; not optimal for space-constrained analog-only designs. |
Compared with MP2965AGQ-0000-P and TPS546D24RQFT, the MAX20812AFH+ delivers superior transient response via AMS and seamless dual-phase scalability without digital overhead - making it ideal for high-performance analog-centric power delivery where layout density and deterministic behavior are prioritized over configurability.
Availability
MAX20812AFH+ is available at Aetrix Electronics and suitable for data center power, communications equipment, and networking equipment requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX20812AFH+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices is a global leader in high-performance analog, mixed-signal, and power management semiconductors, serving industrial, automotive, communications, and data center markets with robust, precision-engineered components.
The MAX20812AFH+ belongs to Analog Devices' high-density power management portfolio, designed specifically for next-generation server, AI accelerator, and 5G infrastructure applications demanding compact, efficient, and highly reliable multi-rail DC-DC conversion.
FAQ
What is the maximum output current capability of the MAX20812AFH+ in dual-phase configuration?
The MAX20812AFH+ supports up to 12A continuous output current in dual-phase mode when SNSP2 is connected to AVDD. This configuration leverages active current balancing to maintain ≤5% phase-current mismatch under dynamic loads, and is validated across the full −40°C to +125°C junction temperature range with appropriate thermal design. The MAX20812AFH+ datasheet specifies 12A thermal rating at TA = +85°C with no airflow.
Does the MAX20812AFH+ support pre-biased output startup?
Yes, the MAX20812AFH+ supports smooth pre-biased startup - a critical feature for hot-swap and rail-sequencing applications. When the output voltage is already present at startup, the MAX20812AFH+ disables reverse current flow and ramps the high-side MOSFET gate drive synchronously to avoid output voltage collapse or overshoot. This behavior is confirmed in Figure 19 of the MAX20812AFH+ datasheet (toc19).
How does the Advanced Modulation Scheme (AMS) improve transient response in the MAX20812AFH+?
The AMS in the MAX20812AFH+ enables both leading-edge and trailing-edge pulse-width modulation during large load transients, reducing control-loop latency by up to 60% versus standard fixed-frequency PWM. As shown in MAX20812AFH+ characterization data (toc24), AMS cuts output voltage deviation by >40% during 1A–6A steps at 10A/µs, allowing smaller output capacitors and faster system stabilization without compromising stability margins.
Can the MAX20812AFH+ operate with an external 3.3V bias applied to the LDOIN pin?
Yes, the MAX20812AFH+ accepts 2.5V–5.5V on the LDOIN pin to power its internal 1.8V VCC rail, improving efficiency by bypassing the VDDH-based LDO. With 3.3V applied to LDOIN, the MAX20812AFH+ achieves up to 1.2 percentage points higher peak efficiency (e.g., 92.5% → 93.7% at 12VIN/1.8VOUT) and reduces thermal stress on the input stage - confirmed in Electrical Characteristics Table (page 4) and toc02 efficiency plot.
What is the purpose of the PGM pins on the MAX20812AFH+ and how are they configured?
The MAX20812AFH+ uses three PGM pins (PGM0, PGM1, PGM2) for resistor-strapped configuration of key operating parameters: switching frequency (500kHz–3MHz), AMS enable/disable, DCM enable/disable, and POCP threshold (6A or 9A). Each pin connects to ground via a resistor between 0.095kΩ and 115kΩ; values are decoded internally with ±1% resistor tolerance support. No external controller or I²C interface is required.
MAX20812AFH+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 21-PowerVFQFN
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 5.8V
- Current - Output:
- 6A, 6A
- Frequency - Switching:
- 500kHz ~ 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 21-FC2QFN (3.5x4.6)
MAX20812AFH+ FAQ
1.How can I place an order for MAX20812AFH+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20812AFH+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX20812AFH+ reliable?
The price and inventory of MAX20812AFH+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20812AFH+ is usually 5 days.
3.What payment methods are accepted for MAX20812AFH+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20812AFH+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20812AFH+?
MAX20812AFH+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20812AFH+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX20812AFH+?
For technical support, including MAX20812AFH+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20812AFH+ requirements.
6.How does Aetrix verify that MAX20812AFH+ is sourced from the original manufacturer or authorized distributors?
All MAX20812AFH+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX20812AFH+ meets industry standards.
7.What is the process for return or replacement of MAX20812AFH+?
All MAX20812AFH+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20812AFH+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX20812AFH+ part is unused and in its original packaging.
Return procedure for MAX20812AFH+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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