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Analog Devices Inc./Maxim Integrated MAX20812AFH+T
- Part No.:
- MAX20812AFH+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerVFQFN
- Datasheet:
-
MAX20812AFH+T.pdf
- Description:
- IC REG BCK ADJ 6A/6A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,300
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Product details
Overview
MAX20812AFH+T from Analog Devices is a dual-output, 6A per channel, 3MHz synchronous step-down DC-DC switching regulator operating from 2.7V to 16V input and delivering 0.5V–5.8V outputs. It supports dual-phase parallel operation up to 12A with interleaved 180° out-of-phase switching, internal compensation, and active current balancing-designed for high-density point-of-load power in data center and networking equipment.
For engineers reviewing the MAX20812AFH+T datasheet, MAX20812AFH+T pinout, MAX20812AFH+T application, or MAX20812AFH+T equivalent, key selection considerations include its FC2QFN-21 package, programmable AMS/DCM modes, dual independent enable/power-good signals, and dual-phase configuration via SNSP2-to-AVDD connection.
Technical Context
The MAX20812AFH+T implements fixed-frequency, peak current-mode control with internal voltage-loop compensation and slope compensation. Each output features an independent error amplifier, PWM modulator, and gate drivers-enabling precise regulation across wide load and line conditions while maintaining stability without external compensation components.
It integrates dual 180° out-of-phase switching controllers with selectable Advanced Modulation Scheme (AMS) for enhanced transient response and configurable Discontinuous Conduction Mode (DCM) for improved light-load efficiency. The device uses pin-strap programming (PGM0/PGM1/PGM2) to configure frequency, AMS, DCM, and output voltage scaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V - supports wide-range industrial and server rails including 3.3V, 5V, 12V, and 15V inputs without external pre-regulation. |
| Output Current per Channel | 6A continuous - enables single-chip dual-rail supply for FPGA core/I/O or CPU VDD/VDDQ domains. |
| Switching Frequency | 500kHz to 3.0MHz - allows optimization of inductor size and EMI filtering; 3MHz operation supports ultra-compact designs. |
| Output Voltage Range | 0.5V to 5.8V - covers sub-1V processor cores, 1.2V/1.8V I/O, and 3.3V/5.0V auxiliary rails using external resistor dividers. |
| Junction Temperature Range | −40°C to +125°C - qualified for harsh thermal environments in telecom and storage systems with no derating up to 85°C ambient. |
| Package | 3.5mm × 4.6mm FC2QFN-21 - open-top thermally enhanced package with exposed PGND pad for low θJC (0.51°C/W) and high-power density. |
| Feedback Reference Voltage | 0.500V ±0.5% - enables accurate output regulation with minimal drift over temperature and line/load variations. |
Pinout & Package
MAX20812AFH+T is housed in a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with open-top construction for superior thermal performance. The exposed PGND pad must be soldered to a large PCB copper area for optimal heat dissipation and EMI control.
| 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 rail with local HF decoupling within 40 mils. |
| LX1 / LX2 | Switching node outputs | Direct connection points to external power inductors; require low-inductance layout and Kelvin sense routing for stability. |
| 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); both accept resistive divider feedback. |
| EN1 / EN2 | Independent enable inputs | Logic-level control (0.6V/0.9V thresholds) with 200µs rising delay; allows staggered startup or independent rail sequencing. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert after soft-start (3ms) and valid regulation; each monitors its own output's OVP/UVP faults independently. |
| PGM0 / PGM1 / PGM2 | Configuration programming inputs | Grounded via precision resistors (0.095kΩ–115kΩ) to select switching frequency, AMS, DCM, and output scaling. |
| VCC / AVDD / LDOIN | Internal bias generation network | VCC = 1.8V LDO output (min 2.2µF to PGND); AVDD = 1.8V analog supply (via 2.2–4.7Ω resistor from VCC); LDOIN = optional 2.5–5.5V external bias for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase operation | Configurable via SNSP2 connection: dual independent 6A rails or single 12A interleaved output with active current balancing. |
| Selectable Advanced Modulation Scheme (AMS) | Enables leading-edge + trailing-edge modulation to reduce output voltage deviation during fast load transients (e.g., 1A→6A @ 10A/µs). |
| Discontinuous Conduction Mode (DCM) | Automatically engages below ~100mA load to reduce switching losses and improve light-load efficiency by lowering fSW. |
| Integrated 1.8V LDO with external bias option | VCC powered internally from VDDH or optionally from 2.5–5.5V LDOIN pin-reducing power loss and improving full-load efficiency by >1.5% at 12VIN/1.8VOUT. |
| Robust protection suite | Includes cycle-by-cycle positive/negative overcurrent, output overvoltage/undervoltage, BST UVLO, and −40°C to +125°C OTP with 20°C hysteresis. |
Applications
| Data Center Point-of-Load | AI Accelerator Power Rails |
|---|---|
|
Use Scenario: Delivering tightly regulated 0.8V/1.2V core and 1.8V I/O supplies to GPU or ASIC modules in 1U servers with strict thermal and space constraints. IC Role / Device Role / Timing Role: Dual-output buck controller providing independent, sequenced, and monitored power rails with <±0.5% output accuracy and 200µs enable delay for safe startup. Use Value: Eliminates need for two discrete regulators-reducing BOM count, PCB area, and thermal hotspots while enabling active current sharing in dual-phase mode for 12A loads. |
Use Scenario: Powering heterogeneous compute tiles in edge AI inference accelerators requiring dynamic voltage scaling and rapid load transient response. IC Role / Device Role / Timing Role: High-bandwidth, AMS-enabled regulator delivering sub-100ns response to 5A load steps-minimizing output droop and reducing required bulk capacitance. Use Value: Achieves 92.5% peak efficiency at 12VIN/1.8VOUT/1MHz and maintains regulation under 10A/µs slew rates-critical for burst-mode AI workloads. |
| 5G Baseband Radio Units | Enterprise Networking Switches |
|
Use Scenario: Generating clean, low-noise 3.3V and 5.0V supplies for RF front-end ICs and ADC/DACs in outdoor macro cell radios operating at −40°C to +85°C. IC Role / Device Role / Timing Role: Dual-channel regulator with independent PGOOD and EN pins enabling fault-isolated power sequencing and brownout recovery in distributed power architectures. Use Value: Internal 1.8V LDO and AVDD biasing eliminate external LDOs; 44.96°C/W θJA enables convection-cooled operation without heatsinks. |
Use Scenario: Supplying multiple voltage rails (1.0V CPU, 1.8V SerDes, 3.3V management) in multi-port Ethernet switches with high port density and fanless cooling. IC Role / Device Role / Timing Role: Compact FC2QFN-21 solution supporting 3MHz switching to shrink magnetics and filter components-reducing total solution size by >30% vs. 500kHz alternatives. Use Value: Programmable DCM extends battery backup runtime in PoE-powered switches; pin-strap configuration avoids firmware dependency during bring-up. |
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 |
|---|---|---|---|
| MP2965GQ-Z (Monolithic Power) | 4.5V–18V input, dual 8A outputs, 500kHz–1.2MHz, no AMS or dual-phase mode; requires external compensation. | Targeted at cost-sensitive industrial PLCs-not optimized for high-frequency, low-ripple AI/data center loads. | Choose MP2965GQ-Z when board space is less constrained and advanced transient response is not required. |
| TPS546D24RQFT (Texas Instruments) | 4.5V–18V input, dual 10A/channel, 300kHz–2MHz, PMBus interface, digital loop compensation, no DCM. | Designed for telemetry-rich server VRMs with real-time margining and fault logging-adds complexity and cost. | Choose TPS546D24RQFT when digital monitoring, adaptive loop tuning, or system-level power management is mandatory. |
Compared with MP2965GQ-Z and TPS546D24RQFT, the MAX20812AFH+T delivers superior transient response via AMS, higher integration (no external compensation), and flexible bias options-making it optimal for space-constrained, high-efficiency analog-intensive applications where analog configurability outweighs digital telemetry needs.
Availability
MAX20812AFH+T is available at Aetrix Electronics and suitable for data center power, AI accelerator boards, and 5G radio units requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX20812AFH+T 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 precision instrumentation, communications, and industrial markets since 1965.
The MAX20812AFH+T belongs to Analog Devices' high-density power management portfolio, engineered specifically for next-generation computing infrastructure demanding ultra-small footprints, fast transient response, and robust thermal performance in −40°C to +125°C environments.
FAQ
What is the maximum output current capability of the MAX20812AFH+T in dual-phase mode?
The MAX20812AFH+T supports up to 12A continuous output current in dual-phase mode when configured with SNSP2 connected to AVDD. This mode leverages interleaved 180° switching and active current balancing to maintain tight phase-current matching (<±5%) across load transients and temperature, enabling single-rail high-current delivery without external current-sharing circuitry.
Does the MAX20812AFH+T require external compensation components?
No, the MAX20812AFH+T features fully internal voltage-loop compensation. Its fixed-frequency, peak current-mode architecture with integrated slope compensation eliminates the need for external Type-II or Type-III compensation networks-reducing design complexity, component count, and layout sensitivity while ensuring stability across all operating conditions specified in the datasheet.
How does the Advanced Modulation Scheme (AMS) improve load transient performance in the MAX20812AFH+T?
The AMS in the MAX20812AFH+T enables simultaneous leading- and trailing-edge modulation, allowing immediate duty-cycle adjustment in response to rapid load changes. This reduces output voltage deviation by up to 40% compared to standard PWM during 1A→6A steps at 10A/µs, minimizing reliance on large output capacitance and improving system-level power integrity.
Can the MAX20812AFH+T operate with a pre-biased output during startup?
Yes, the MAX20812AFH+T supports smooth pre-biased startup. When the output voltage is already present at startup (e.g., due to back-feed from downstream circuitry), the device ramps the high-side MOSFET gate drive synchronously to avoid reverse current flow-ensuring safe, controlled regulation without output voltage overshoot or latch-up.
What thermal performance can be expected from the MAX20812AFH+T in a typical 2-layer PCB layout?
In a standard 2-layer PCB with 2oz copper and 4cm² exposed PGND thermal pad, the MAX20812AFH+T achieves ≤55°C junction rise at 6A per channel (12A dual-phase) with 200LFM airflow. Its 0.51°C/W junction-to-case thermal resistance and FC2QFN open-top construction enable reliable operation at full rated load without forced air or heatsinks in most enterprise and telecom applications.
MAX20812AFH+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 21-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX20812AFH+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20812AFH+T 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+T reliable?
The price and inventory of MAX20812AFH+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20812AFH+T is usually 5 days.
3.What payment methods are accepted for MAX20812AFH+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20812AFH+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20812AFH+T?
MAX20812AFH+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20812AFH+T 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+T?
For technical support, including MAX20812AFH+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20812AFH+T requirements.
6.How does Aetrix verify that MAX20812AFH+T is sourced from the original manufacturer or authorized distributors?
All MAX20812AFH+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX20812AFH+T?
All MAX20812AFH+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20812AFH+T, 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+T part is unused and in its original packaging.
Return procedure for MAX20812AFH+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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