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Analog Devices Inc./Maxim Integrated MAX20812TAFH+
- Part No.:
- MAX20812TAFH+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerWFQFN
- Datasheet:
-
MAX20812TAFH+.pdf
- Description:
- IC REG BCK ADJ 6A/6A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,389
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Product details
Overview
MAX20812TAFH+ 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 12A operation when SNSP2 is tied to AVDD, features internal 1.8V LDO (VCC), 180° interleaved operation, and selectable AMS for improved transient response - deployed in data center point-of-load power rails.
For engineers reviewing the MAX20812TAFH+ datasheet, MAX20812TAFH+ pinout, MAX20812TAFH+ application, or MAX20812TAFH+ equivalent, key selection criteria include dual-output vs. dual-phase configuration flexibility, 21-pin FC2QFN package thermal performance (θJC = 10.1°C/W), programmable switching frequency (500kHz–3MHz), and verified 92.5% peak efficiency at 12VIN/1.8VOUT/1MHz.
Technical Context
The MAX20812TAFH+ implements fixed-frequency, peak current-mode control with internal compensation and independent error amplifiers per output. Its 180° out-of-phase dual-loop architecture enables interleaved operation, reducing input/output ripple and improving thermal distribution across PCB layout.
It integrates three pin-strap PGM inputs (PGM0/PGM1/PGM2) to configure switching frequency, AMS enable, DCM mode, and dual-phase operation. The device uses internal slope compensation and supports pre-biased startup, hiccup-mode fault recovery, and active current balancing only in MAX20812 (not MAX20812T) dual-phase mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V - supports wide-range industrial and server supply rails including 3.3V, 5V, 12V intermediate bus. |
| Output Voltage Range | 0.5V to 5.8V - covers core logic (0.8V–1.8V), I/O (3.3V), and auxiliary rails with ±1% feedback reference accuracy. |
| Max Output Current | 6A per output (dual-output); 12A combined (dual-phase) - validated up to +125°C junction temperature with 200LFM airflow. |
| Switching Frequency | 500kHz to 3.0MHz - configurable via PGM resistors; higher frequencies reduce inductor size but increase switching loss. |
| Efficiency | 92.5% peak at 12VIN/1.8VOUT/1MHz - achieved using integrated high-side/low-side MOSFETs and optimized gate drive (VCC = 1.8V). |
| Junction Temp Range | –40°C to +125°C - qualified for harsh environments; thermal shutdown triggers at +155°C with 20°C hysteresis. |
| Package | 3.5mm × 4.6mm, 21-pin FC2QFN (closed-top) - exposes die paddle for low θJC = 10.1°C/W; RoHS-compliant. |
Pinout & Package
MAX20812TAFH+ is housed in a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with exposed thermal pad (closed-top variant). Pin 1 is VDDH2; pin 17 is VDDH1; pins 18/21 are BST1/BST2; pins 19/20 are LX1/LX2; pins 4/14 are open-drain PGOOD1/PGOOD2; pins 12/3 are EN1/EN2; pins 11/7 are SNSP1/SNSP2; pins 5/6/13 are PGM2/PGM0/PGM1; pins 8/15/9/10/16/2/1 are AVDD/VCC/LDOIN/AGND/PGND1/PGND2/VDDH2 respectively.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | Input power supply for OUTPUT1 / OUTPUT2 | Must be connected together on PCB; supplies gate drivers and internal circuitry; UVLO threshold = 2.5V (±0.1V). |
| LX1 / LX2 | Switching node for OUTPUT1 / OUTPUT2 | Connects directly to inductor; handles high di/dt; requires low-inductance layout and ceramic bootstrap caps (0.22µF) to BST1/BST2. |
| BST1 / BST2 | Bootstrap supply for high-side MOSFET gate drive | Capacitor from BSTx to Lx generates floating voltage > VDDH for NMOS high-side switch; critical for duty cycle > 50%. |
| SNSP1 / SNSP2 | Output voltage sense feedback input | Connects to load for remote sensing; 0.5V reference; tie SNSP2 to AVDD to enable dual-phase mode (MAX20812 only). |
| PGM0 / PGM1 / PGM2 | Configuration programming inputs | Resistor-to-ground sets fSW, AMS, DCM, and phase mode; 0.095kΩ–115kΩ range; ±1% resistor tolerance required. |
| EN1 / EN2 | Enable control for OUTPUT1 / OUTPUT2 | Active-high; 0.9V rising threshold; 200µs filtering delay prevents false turn-on; independent control enables sequencing. |
| PGOOD1 / PGOOD2 | Open-drain power-good status indicator | Pulled low during UV/OV/OC/OTP faults or soft-start; requires external pull-up; deglitch delays ensure noise immunity. |
| VCC / AVDD / LDOIN | Internal 1.8V LDO output / analog supply / optional bias input | VCC powers gate drivers; AVDD (1.8V) powers analog core; LDOIN accepts 2.5V–5.5V external bias to improve efficiency over VDDH-derived VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase reconfiguration | Single IC supports two independent 6A rails OR one 12A rail via SNSP2-to-AVDD connection - reduces BOM count and board area. |
| Selectable Advanced Modulation Scheme (AMS) | Enables leading-edge + trailing-edge PWM modulation to cut load transient response time by >50% vs. standard CCM - minimizes output capacitance. |
| Discontinuous Conduction Mode (DCM) | Automatically engages below ~100mA load to reduce switching losses; extends light-load efficiency without external control logic. |
| Integrated 1.8V LDO with optional external bias | VCC generated internally from VDDH or externally from 2.5V–5.5V LDOIN - improves conversion efficiency by up to 3% at full load. |
| Robust protection suite | Includes cycle-by-cycle POCP (6A/9A thresholds), NOCP, OVP (±13%), UVLO on VDDH/LDOIN/AVDD, and OTP with 20ms hiccup restart - ensures system-level reliability. |
Applications
| Data Center Point-of-Load | AI Accelerator Core Supply |
|---|---|
Use Scenario: Delivering tightly regulated 0.8V–1.2V at up to 12A to GPU or ASIC cores in high-density server racks with strict thermal limits. IC Role / Device Role / Timing Role: Dual-phase buck controller providing interleaved 180° switching to halve input ripple current and distribute heat across two phases. Use Value: Enables smaller input capacitors and reduced thermal hotspots; 92.5% peak efficiency at 1.8V/12A lowers cooling requirements in 1U chassis. | Use Scenario: Powering heterogeneous compute tiles in AI training accelerators requiring fast dynamic voltage scaling (DVS) during workload bursts. IC Role / Device Role / Timing Role: Dual-output regulator supplying independent 0.85V core and 1.2V memory rails with synchronized enable and PGOOD signaling. Use Value: AMS-enabled transient response limits output droop to <50mV under 10A/µs load steps - avoids timing violations in sub-1ns clock domains. |
| 5G Baseband Radio Unit | Industrial Edge Controller |
Use Scenario: Generating clean, low-noise 1.0V and 3.3V rails for FPGA fabric and RF front-end ICs in outdoor macrocell radios operating from -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual-output buck converter with remote sensing (SNSP1/SNSP2) and independent EN/PGOOD for rail sequencing and fault isolation. Use Value: ±1% output accuracy over temperature and line/load regulation <±0.5% ensures stable FPGA configuration and ADC reference integrity. | Use Scenario: Providing isolated 1.8V I/O and 5.0V peripheral rails in DIN-rail mounted PLCs powered from 24VDC industrial bus. IC Role / Device Role / Timing Role: Step-down regulator operating from wide 2.7V–16V input; uses LDOIN bias from 5V rail to maximize efficiency at partial load. Use Value: DCM mode extends no-load efficiency to >75%, reducing standby power and enabling fanless enclosure design. |
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–16V input; dual 10A outputs; no AMS; requires external compensation; larger 5mm × 6mm QFN-39 package. | Targeted at higher-current applications where board space is less constrained; lacks integrated LDO bias option. | Choose MP2965GQ-Z if >10A per rail is needed and layout allows larger footprint; avoid if AMS or compact 3.5×4.6mm FC2QFN is required. |
| TPS546D24RWR (Texas Instruments) | 4.5V–18V input; dual 12A/10A outputs; PMBus interface; digital control; 6mm × 6mm VQFN-40 package. | Supports telemetry, margining, and dynamic voltage scaling via I²C; adds firmware complexity and cost. | Choose TPS546D24RWR if digital monitoring and adaptive control are mandatory; MAX20812TAFH+ offers simpler analog configuration and lower BOM count. |
Compared with MP2965GQ-Z and TPS546D24RWR, the MAX20812TAFH+ delivers superior power density in a 3.5mm × 4.6mm FC2QFN, integrates AMS for best-in-class transient response without digital overhead, and supports flexible biasing (LDOIN) - making it optimal for space-constrained, high-efficiency analog-controlled PoL designs.
Availability
MAX20812TAFH+ is available at Aetrix Electronics and suitable for data center power, AI accelerator supply, 5G radio unit, and industrial edge controller applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for MAX20812TAFH+ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Wilmington, MA.
The MAX20812TAFH+ belongs to Analog Devices' high-density power management portfolio, designed specifically for demanding point-of-load applications in data centers, communications infrastructure, and AI hardware where efficiency, thermal performance, and transient response are critical.
FAQ
What is the difference between MAX20812 and MAX20812T, and which one does MAX20812TAFH+ correspond to?
MAX20812 has an open-top FC2QFN package; MAX20812T has a closed-top variant for improved mechanical robustness and moisture resistance. MAX20812TAFH+ is the closed-top version (package code F213A4F+2), confirmed by its ordering suffix "T" and thermal resistance data (θJC = 10.1°C/W). Both share identical electrical specs, but MAX20812T excludes active current balancing in dual-phase mode.
Can MAX20812TAFH+ operate in dual-phase mode, and what is required to configure it?
Yes, MAX20812TAFH+ supports dual-phase operation by connecting SNSP2 to AVDD, as documented in the datasheet's Simplified Application Circuits and Detailed Description sections. However, unlike MAX20812, the MAX20812T variant does not implement active current balancing in dual-phase mode - phase current sharing relies on passive matching of inductors and layout symmetry.
What is the minimum controllable on-time for MAX20812TAFH+, and why does it matter for low-VOUT designs?
The minimum controllable on-time for MAX20812TAFH+ is 32ns (typical) at zero load and 27ns (typical) at 1A load. This spec directly determines the lowest achievable output voltage at high switching frequencies - e.g., at 3MHz, a 32ns on-time supports VOUT ≥ VIN × 32ns × 3MHz ≈ 0.3V, enabling stable 0.5V–0.8V core rails without pulse-skipping artifacts.
How does the Advanced Modulation Scheme (AMS) in MAX20812TAFH+ improve load transient performance?
AMS in MAX20812TAFH+ enables both leading-edge and trailing-edge PWM modulation, allowing immediate high-side switch turn-on during sudden load increases - bypassing the fixed clock delay inherent in standard trailing-edge schemes. This cuts output voltage deviation by >50% under 10A/µs transients, as verified in Figure toc24 of the datasheet, and reduces required bulk capacitance.
Does MAX20812TAFH+ require external compensation components, and how is stability ensured?
No, MAX20812TAFH+ uses internal compensation with fixed-frequency current-mode control - eliminating external RC networks. Stability is guaranteed across all configurations (500kHz–3MHz, 0.5V–5.8V VOUT) via factory-trimmed compensation networks, validated by Bode plot measurements showing 59° phase margin and 14dB gain margin at 208kHz bandwidth (Figure toc26).
MAX20812TAFH+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 21-PowerWFQFN
- 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)
MAX20812TAFH+ FAQ
1.How can I place an order for MAX20812TAFH+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20812TAFH+ 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+ reliable?
The price and inventory of MAX20812TAFH+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20812TAFH+ is usually 5 days.
3.What payment methods are accepted for MAX20812TAFH+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20812TAFH+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20812TAFH+?
MAX20812TAFH+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20812TAFH+ 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+?
For technical support, including MAX20812TAFH+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20812TAFH+ requirements.
6.How does Aetrix verify that MAX20812TAFH+ is sourced from the original manufacturer or authorized distributors?
All MAX20812TAFH+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX20812TAFH+?
All MAX20812TAFH+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20812TAFH+, 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+ part is unused and in its original packaging.
Return procedure for MAX20812TAFH+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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