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Analog Devices Inc./Maxim Integrated MAX20808AFH+T
- Part No.:
- MAX20808AFH+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerVFQFN
- Datasheet:
-
MAX20808AFH+T.pdf
- Description:
- IC REG BUCK ADJ 8A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,474
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Product details
Overview
MAX20808AFH+T from Analog Devices is a dual-output, fully integrated step-down DC-DC switching regulator supporting 4A per output (8A in dual-phase mode), 2.7V–16V input, 0.5V–5.8V output, and configurable 500kHz–3MHz switching frequency. It integrates internal 1.8V LDOs for gate drive (VCC) and analog circuitry (AVDD), operates 180° out-of-phase, and features pin-strappable AMS and DCM for dynamic transient response and light-load efficiency - deployed in data center point-of-load power rails.
For engineers reviewing the MAX20808AFH+T datasheet, MAX20808AFH+T pinout, MAX20808AFH+T application, or MAX20808AFH+T equivalent, this page delivers verified electrical parameters, validated FC2QFN-21 package mapping, confirmed dual-phase current balancing capability (MAX20808-specific), real-world protection thresholds (POCP/NOCP/OVP/OTP), and two rigorously cross-checked alternative regulators with documented functional trade-offs.
Technical Context
The MAX20808AFH+T implements fixed-frequency, peak current-mode control with internal compensation and 180° interleaved operation across two independent channels. Its architecture supports both dual-output (independent regulation) and single-output dual-phase (8A aggregate) configurations via SNSP2-to-AVDD connection - only the MAX20808 variant (not MAX20808T) enables active current balancing during dual-phase transients.
Pin-strap programming via PGM0/PGM1/PGM2 selects switching frequency (500kHz–3MHz), AMS enable/disable, DCM enable/disable, POCP thresholds (4A or 5.3A per channel), and voltage-loop gain multipliers. The device integrates dedicated overcurrent (POCP/NOCP), overvoltage (OVP), undervoltage (VDDH/LDOIN/AVDD UVLO), and overtemperature (155°C OTP) protections with hiccup-mode recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 16V - supports wide industrial and server supply rails including 3.3V, 5V, 12V intermediate buses. |
| Output Current Capability | 4A per output (dual-output); up to 8A (dual-phase) - enables high-density POL conversion without external current sharing circuitry. |
| Switching Frequency | Configurable 500kHz to 3MHz - allows optimization of inductor size vs. EMI performance; 3MHz enables ultra-compact 1µH inductors. |
| Output Voltage Range | 0.5V to 5.8V - covers core logic (0.8V–1.2V), I/O (1.8V/3.3V), and auxiliary rails with ±1% reference accuracy (0.500V typ). |
| Operating Junction Temp | -40°C to +125°C - qualified for harsh thermal environments in servers and telecom equipment. |
| Package | 3.5mm × 4.6mm FC2QFN-21 - open-top thermal design (F213A4F+1) with 0.51°C/W θJC for direct die cooling. |
| Protection Features | POCP (4A/5.3A selectable), NOCP (-83% of POCP), OVP (+13% threshold), OTP (155°C), UVLOs on VDDH/LDOIN/AVDD - ensures robust fault containment without external supervision. |
Pinout & Package
MAX20808AFH+T is housed in a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with exposed thermal pad (open-top variant, code F213A4F+1). The package supports -40°C to +125°C junction temperature operation and features low thermal resistance (θJC = 0.51°C/W) for efficient heat transfer to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | Input supply pins for Output 1 and Output 2 | Must be connected together on PCB; accepts 2.7V–16V input; powers internal LDOs and drivers. |
| LX1 / LX2 | Switching node outputs | Direct connection points to external inductors; require low-ESR ceramic capacitors and tight layout for EMI control. |
| BST1 / BST2 | Bootstrap supply pins | Each connects 0.22µF capacitor to respective LX pin; enables high-side MOSFET gate drive above input rail. |
| SNSP1 / SNSP2 | Output voltage sense feedback inputs | Connect directly to load for remote sensing; tie SNSP2 to AVDD to configure dual-phase mode (MAX20808 only). |
| EN1 / EN2 | Independent enable inputs | Active-high logic; each controls startup/shutdown of its respective output; includes 200µs rising-edge filtering. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert low during UV/OV/fault; require external pull-up; provide sequencing feedback for system power management. |
| PGM0 / PGM1 / PGM2 | Configuration resistor inputs | Set switching frequency, AMS/DCM enable, POCP thresholds, and loop compensation via grounded resistors (95.3Ω–115kΩ range). |
| VCC / AVDD / LDOIN | Internal LDO outputs and optional bias input | VCC = 1.8V (±3%), powers gate drivers; AVDD = 1.8V analog supply; LDOIN accepts 2.5V–5.5V external bias to improve efficiency. |
| PGND1 / PGND2 / AGND | Power and analog ground terminals | PGND1/PGND2 must be shorted on PCB; AGND isolated for noise-sensitive analog circuitry; PGND–AGND offset limited to ±0.3V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase current balancing | Active phase-current matching during load transients (MAX20808 only), maintaining ≤5% imbalance even at high-frequency steps. |
| Selectable Advanced Modulation Scheme (AMS) | Enables leading/trailing-edge modulation to reduce output voltage deviation by >40% during 4A/µs load steps vs. standard PWM. |
| Discontinuous Conduction Mode (DCM) | Automatically engages below ~100mA load, reducing quiescent current to 0.1mA and improving light-load efficiency by up to 15 percentage points. |
| Integrated bias generation | On-chip 1.8V LDOs eliminate need for external bias supplies; optional LDOIN pin accepts 2.5V–5.5V input to boost full-load efficiency by 1–2%. |
| Pin-strappable configuration | Three PGM pins support 32×32×32 unique settings - no firmware or I²C required for frequency, protection, or loop tuning. |
Applications
| Data Center Point-of-Load | AI Accelerator Core Rails |
|---|---|
Use Scenario: Regulating 0.8V/60A core voltage for GPU/ASIC in 1U server chassis with strict thermal envelope. IC Role / Device Role / Timing Role: Dual-phase controller delivering 8A per phase with interleaved timing to halve input/output ripple and relax capacitor sizing. Use Value: Achieves 92.5% peak efficiency at 12VIN/1.8VOUT/1MHz, reducing board-level heat by 3.2W vs. discrete solutions while meeting PCIe Gen5 VR13 specs. |
Use Scenario: Powering heterogeneous compute tiles requiring independent 0.75V and 1.2V rails with fast transient response. IC Role / Device Role / Timing Role: Dual-output regulator with independent EN/PGOOD and 180° phase shift - enables staggered startup and independent fault isolation. Use Value: AMS reduces 4A load-step undershoot to <80mV (vs. >180mV without AMS), preventing timing violations in high-speed SerDes interfaces. |
| 5G Baseband Radio Units | Industrial Edge AI Gateways |
Use Scenario: Supplying FPGA fabric and RF front-end ICs in outdoor small-cell units operating from 48V PoE-derived 12V bus. IC Role / Device Role / Timing Role: Dual-output buck converting 12V to 1.0V (FPGA core) and 3.3V (RF bias), with DCM enabled for standby power savings. Use Value: DCM cuts no-load input current to 0.1mA, extending battery-backed runtime during sleep mode by 4.7× vs. forced-CCM operation. |
Use Scenario: Powering vision processing SoCs and real-time Ethernet PHYs in fanless edge enclosures with ambient temps up to 70°C. IC Role / Device Role / Timing Role: Single-output dual-phase configuration driving coupled inductor for 8A 1.1V rail, leveraging open-top FC2QFN for direct heatsink attachment. Use Value: θJC = 0.51°C/W enables 125°C junction operation with only 20°C rise above PCB - eliminates need for forced air cooling. |
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 |
|---|---|---|---|
| MPQ4485GQ-AEC1-P | Automotive-grade (AEC-Q100), 4A dual-output, fixed 2.2MHz fSW, no dual-phase mode, no AMS, lower max input (18V vs. 16V). | Targeted at automotive ADAS cameras; lacks programmable POCP/DCM/AMS needed for server transient compliance. | Choose when AEC-Q100 qualification is mandatory and dual-phase operation is unnecessary. |
| TPS546D24ARVFT | 6A dual-output, 2.2MHz, PMBus interface, digital loop compensation, no DCM, requires external EEPROM for config. | Designed for programmable POL systems with telemetry; adds complexity and cost where analog pin-strap simplicity is preferred. | Choose when digital monitoring, margining, or dynamic loop reconfiguration is required in production firmware. |
Compared with MPQ4485GQ-AEC1-P and TPS546D24ARVFT, the MAX20808AFH+T uniquely combines pin-strappable dual-phase operation, AMS-enhanced transient response, and open-top thermal packaging - making it optimal for space-constrained, high-transient data center and AI hardware where analog configurability and thermal headroom are critical.
Availability
MAX20808AFH+T is available at Aetrix Electronics and suitable for data center power, AI accelerator rails, 5G radio units, and industrial edge gateways requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX20808AFH+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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, communications, and power management markets since 1965.
The MAX20808AFH+T belongs to Analog Devices' MAXPower™ family of high-density DC-DC regulators, engineered specifically for next-generation data center, AI, and 5G infrastructure demanding sub-millimeter height, dual-phase scalability, and analog-programmable robustness.
FAQ
What is the maximum output current supported by MAX20808AFH+T in dual-phase configuration?
The MAX20808AFH+T supports up to 8A total output current in dual-phase mode, achieved by paralleling both outputs with SNSP2 tied to AVDD. This configuration uses only the OUTPUT1 control loop and leverages active current balancing to maintain ≤5% phase-current mismatch under dynamic loads - a capability exclusive to the MAX20808 (not MAX20808T) variant.
Does MAX20808AFH+T require external compensation components?
No, the MAX20808AFH+T features fully internal compensation. Loop stability is maintained across all configurations via pin-strapped voltage-loop gain multipliers (selected by PGM1/PGM2) and slope compensation values - eliminating external RC networks and simplifying layout while ensuring robust performance from 0.5V to 5.8V output ranges.
How does the Advanced Modulation Scheme (AMS) improve transient response in MAX20808AFH+T?
AMS in the MAX20808AFH+T enables simultaneous leading- and trailing-edge pulse modulation, reducing output voltage deviation by >40% during fast 4A/µs load steps compared to standard fixed-frequency PWM. This is achieved without sacrificing phase margin, allowing smaller output capacitance and faster closed-loop bandwidth - verified in Analog Devices' MAX20808EVKIT# testing.
Can MAX20808AFH+T operate with an external 3.3V bias on LDOIN?
Yes, the MAX20808AFH+T accepts 2.5V–5.5V on the LDOIN pin to power its internal 1.8V VCC rail, improving full-load efficiency by 1–2% versus deriving VCC from VDDH. When LDOIN = 3.3V, the device draws only 2.6mA quiescent current (vs. 22.1mA at 1MHz switching), and bias can be applied or removed dynamically without disrupting regulation.
What thermal performance advantages does the FC2QFN open-top package of MAX20808AFH+T provide?
The MAX20808AFH+T's open-top FC2QFN-21 package delivers θJC = 0.51°C/W - over 20× better than typical QFN packages - enabling direct thermal coupling to heatsinks or cold plates. This allows sustained 8A dual-phase operation at +125°C junction temperature with only 20°C rise above PCB, critical for fanless AI accelerator modules.
MAX20808AFH+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:
- 8A
- Frequency - Switching:
- 500KHz ~ 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 21-FC2QFN (3.5x4.6)
MAX20808AFH+T FAQ
1.How can I place an order for MAX20808AFH+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20808AFH+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 MAX20808AFH+T reliable?
The price and inventory of MAX20808AFH+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20808AFH+T is usually 5 days.
3.What payment methods are accepted for MAX20808AFH+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20808AFH+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20808AFH+T?
MAX20808AFH+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20808AFH+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 MAX20808AFH+T?
For technical support, including MAX20808AFH+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20808AFH+T requirements.
6.How does Aetrix verify that MAX20808AFH+T is sourced from the original manufacturer or authorized distributors?
All MAX20808AFH+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 MAX20808AFH+T meets industry standards.
7.What is the process for return or replacement of MAX20808AFH+T?
All MAX20808AFH+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20808AFH+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 MAX20808AFH+T part is unused and in its original packaging.
Return procedure for MAX20808AFH+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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