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Analog Devices Inc./Maxim Integrated MAX20812TAFH+T
- Part No.:
- MAX20812TAFH+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerWFQFN
- Datasheet:
-
MAX20812TAFH+T.pdf
- Description:
- IC REG BCK ADJ 6A/6A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,465
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Product details
Overview
MAX20812TAFH+T 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 integrates internal 1.8V LDO for gate drive and analog circuitry, supports AMS for improved transient response, and targets high-density point-of-load power in data center and networking equipment.
For engineers reviewing the MAX20812TAFH+T datasheet, MAX20812TAFH+T pinout, MAX20812TAFH+T application, or MAX20812TAFH+T equivalent, key selection considerations include dual-output vs. dual-phase configuration flexibility, 21-pin FC2QFN package thermal performance (θJC = 10.1°C/W), selectable DCM for light-load efficiency, and independent enable/power-good signaling per channel.
Technical Context
The MAX20812TAFH+T implements fixed-frequency, peak current-mode control with internal compensation and 180° out-of-phase interleaving between outputs. Its dual-loop architecture supports independent regulation of two outputs or reconfiguration into a single 12A dual-phase converter via SNSP2-to-AVDD connection (MAX20812 only; MAX20812T supports dual-output only).
It features pin-strap programmable settings including switching frequency, AMS enable, and DCM mode, using three PGM pins with resistor-to-ground configuration. The device integrates protection including ± overcurrent, output overvoltage, and overtemperature (155°C trip), with hiccup-mode recovery and 20ms fault hold-off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V - supports wide industrial and server supply rails without external pre-regulation. |
| Output Current per Channel | 6A continuous - enables compact dual-rail POL delivery for FPGA, ASIC, or CPU core/memory supplies. |
| Switching Frequency Range | 500kHz to 3.0MHz - allows optimization of inductor size and EMI filtering while maintaining stability. |
| Output Voltage Range | 0.5V to 5.8V - covers DDR, core, I/O, and auxiliary rail requirements with 0.5V reference accuracy (±1.1% max). |
| Junction Temperature Range | −40°C to +125°C - rated for harsh environments including baseband units and storage controllers. |
| Package Thermal Resistance | θJC = 10.1°C/W (closed-top) - enables high-power density operation with direct heatsink attachment to exposed top metal. |
| Peak Efficiency | 92.5% at 12VIN, 1.8VOUT, 1MHz - reduces thermal load and improves system-level power budget margin. |
Pinout & Package
The MAX20812TAFH+T is housed in a 3.5mm × 4.6mm, 21-pin FC2QFN package with closed-top construction (F213A4F+2), supporting −40°C to +125°C junction temperature and optimized thermal dissipation via top-side metal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | Input supply for Output 1 / Output 2 | Must be connected together on PCB; powers high-side MOSFETs and internal bias circuits. |
| LX1 / LX2 | Switching node for Output 1 / Output 2 | Direct connection to inductor; requires low-inductance layout to minimize ringing and EMI. |
| BST1 / BST2 | Bootstrap supply for high-side gate driver | Requires 0.22μF ceramic capacitor to respective LX pin; critical for high-side FET turn-on reliability. |
| SNSP1 / SNSP2 | Output voltage sense feedback inputs | Connect directly to load for remote sensing; SNSP2 tied to AVDD configures dual-phase (not supported on MAX20812T). |
| EN1 / EN2 | Enable inputs for Output 1 / Output 2 | Independent logic-level control (0.6V/0.9V thresholds); supports staggered startup and fault isolation. |
| PGOOD1 / PGOOD2 | Open-drain power-good status outputs | Asserted after soft-start completion and within ±10% output regulation; requires external pull-up. |
| PGM0 / PGM1 / PGM2 | Configuration programming inputs | Resistor-to-ground sets switching frequency, AMS, DCM, and phase configuration (dual-output only for MAX20812T). |
| VCC / AVDD / LDOIN | Internal LDO output / analog supply / optional external bias | VCC (1.8V) powers gate drivers; AVDD (1.8V) powers analog core; LDOIN accepts 2.5V–5.5V for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase topology | Configurable as two independent 6A regulators or (MAX20812 only) one 12A dual-phase unit - maximizes design reuse across power architectures. |
| Selectable Advanced Modulation Scheme (AMS) | Enables leading-edge + trailing-edge PWM modulation - reduces output voltage deviation during 10A/μs transients by >40% vs. standard CCM. |
| Discontinuous Conduction Mode (DCM) | Automatically engages below ~100mA valley current - improves light-load efficiency by up to 8% at 10mA vs. forced CCM. |
| Integrated 1.8V LDO with external bias option | VCC derived from LDOIN (2.5V–5.5V) cuts quiescent current by 20× vs. VDDH-derived bias - extends battery life in always-on subsystems. |
| Independent enable and power-good per output | Supports sequenced startup, rail-specific fault reporting, and hot-swap compatibility without external logic. |
Applications
| Data Center Point-of-Load | Networking Line Cards |
|---|---|
Use Scenario: Powering FPGA I/O banks and transceiver arrays on high-speed switch line cards requiring tight voltage tolerance and fast transient response. IC Role / Device Role / Timing Role: Dual-output regulator delivering 1.2V @ 6A (core) and 2.5V @ 6A (I/O) with independent sequencing and monitoring. Use Value: Eliminates need for two discrete converters; AMS reduces required output capacitance by 30% for 10A step loads. | Use Scenario: Supplying 1.8V and 3.3V rails to multi-core packet processors and SerDes PHYs in 100G/400G optical modules. IC Role / Device Role / Timing Role: Dual-channel POL regulator with independent PGOOD signaling enabling processor-initiated rail validation before firmware execution. Use Value: 3.5mm × 4.6mm footprint saves >40% board area vs. discrete solutions; closed-top package enables direct thermal interface to module housing. |
| Servers and Storage Controllers | Industrial Edge AI Accelerators |
Use Scenario: Providing tightly regulated 0.8V @ 6A and 1.1V @ 6A to CPU cores and memory interfaces in rack-mounted servers with constrained airflow. IC Role / Device Role / Timing Role: Dual-output buck regulator with thermal derating curves validated up to +125°C junction and 200LFM airflow. Use Value: Internal current-mode control and 180° interleaving reduce input ripple current by 70%, easing front-end filter design. | Use Scenario: Powering heterogeneous AI SoCs (e.g., NPU + DSP + vision ISP) in fanless edge inference boxes requiring silent, high-efficiency operation. IC Role / Device Role / Timing Role: Dual-rail regulator with DCM enabled for standby mode and AMS active during inference bursts. Use Value: 92.5% peak efficiency at full load and <100μA quiescent current in DCM extend runtime in battery-backed deployments. |
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 |
|---|---|---|---|
| MP24894DQKT-LF-Z | Single-output 12A, 2.5–18V input, no AMS or DCM; 16-pin QFN; lower integration (external bootstrap caps, no integrated LDO) | Best suited for cost-sensitive, single-rail applications where dual-output independence is unnecessary | Select when needing only one high-current rail and willing to add external bias and loop compensation components |
| TPS546D24RQFT | Dual-output 10A/10A, 3–16V input, PMBus interface, 40-pin QFN; includes telemetry, margining, and digital loop tuning | Targeted at systems requiring real-time monitoring, dynamic voltage scaling, or firmware-based fault logging | Select when digital control, rail telemetry, or adaptive loop tuning outweighs analog simplicity and smaller footprint |
Compared with MP24894DQKT-LF-Z and TPS546D24RQFT, the MAX20812TAFH+T delivers superior power density (21-pin vs. 16/40-pin), analog-only simplicity, and unique AMS-enhanced transient performance - making it optimal for space-constrained, high-dV/dt applications where deterministic analog behavior is prioritized over digital configurability.
Availability
MAX20812TAFH+T is available at Aetrix Electronics and suitable for data center power, communications equipment, and networking infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX20812TAFH+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 digital signal processing semiconductors, serving precision instrumentation, industrial automation, communications, and automotive markets.
The MAX20812TAFH+T belongs to Analog Devices' high-density power management portfolio, designed specifically for next-generation data center, AI accelerator, and 5G infrastructure applications demanding ultra-compact, thermally robust, and transient-responsive POL solutions.
FAQ
What is the maximum output current capability of the MAX20812TAFH+T in dual-output mode?
The MAX20812TAFH+T delivers up to 6A per output channel in dual-output mode, with each channel independently regulated from 0.5V to 5.8V. It does not support dual-phase parallel operation like the MAX20812 - the MAX20812TAFH+T is strictly dual-output only, as confirmed by its closed-top FC2QFN package and datasheet limitations on SNSP2 functionality.
Does the MAX20812TAFH+T support pre-biased output startup?
Yes, the MAX20812TAFH+T supports smooth pre-biased startup, allowing the output to be powered before the IC enables. This prevents reverse current flow into the output capacitors during power-up sequences, which is essential for systems with multiple power domains or hot-swap requirements. Startup timing is characterized in Figure 3 of the datasheet.
How does the Advanced Modulation Scheme (AMS) improve transient response in the MAX20812TAFH+T?
The AMS in the MAX20812TAFH+T enables both leading-edge and trailing-edge PWM modulation during large load steps, reducing control loop latency. This increases closed-loop bandwidth without sacrificing phase margin, resulting in up to 40% less output voltage deviation during 10A/μs transients compared to standard fixed-frequency CCM operation - verified in Figure toc24 of the datasheet.
What is the purpose of the LDOIN pin on the MAX20812TAFH+T, and what voltage range is acceptable?
The LDOIN pin on the MAX20812TAFH+T accepts an optional external 2.5V to 5.5V bias supply to power the internal 1.8V VCC LDO more efficiently than deriving it from VDDH. Using LDOIN reduces quiescent current by up to 20× and improves light-load efficiency - especially valuable in always-on subsystems. The pin may be left floating, tied to AVDD, or grounded if unused.
Can the MAX20812TAFH+T operate with different switching frequencies on each output?
No - the MAX20812TAFH+T uses a single, globally configured switching frequency set via PGM resistors. Both outputs operate synchronously at the same frequency (500kHz–3MHz), with 180° phase offset to reduce input ripple. Independent frequency control is not supported; frequency selection applies to the entire device, as specified in the Electrical Characteristics table under fSW_ parameter.
MAX20812TAFH+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 21-PowerWFQFN
- 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)
MAX20812TAFH+T FAQ
1.How can I place an order for MAX20812TAFH+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20812TAFH+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 MAX20812TAFH+T reliable?
The price and inventory of MAX20812TAFH+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20812TAFH+T is usually 5 days.
3.What payment methods are accepted for MAX20812TAFH+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20812TAFH+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20812TAFH+T?
MAX20812TAFH+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20812TAFH+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 MAX20812TAFH+T?
For technical support, including MAX20812TAFH+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20812TAFH+T requirements.
6.How does Aetrix verify that MAX20812TAFH+T is sourced from the original manufacturer or authorized distributors?
All MAX20812TAFH+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 MAX20812TAFH+T meets industry standards.
7.What is the process for return or replacement of MAX20812TAFH+T?
All MAX20812TAFH+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20812TAFH+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 MAX20812TAFH+T part is unused and in its original packaging.
Return procedure for MAX20812TAFH+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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