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Analog Devices Inc./Maxim Integrated MAX20808AFH+
- Part No.:
- MAX20808AFH+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerVFQFN
- Datasheet:
-
MAX20808AFH+.pdf
- Description:
- IC REG BCK ADJ 4A/4A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:872
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Product details
Overview
MAX20808AFH+ from Analog Devices is a dual-output, fully integrated step-down DC-DC switching regulator delivering up to 4A per output (8A 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 LDOs 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 MAX20808AFH+ datasheet, MAX20808AFH+ pinout, MAX20808AFH+ application, or MAX20808AFH+ equivalent, this page delivers verified technical context, validated pin functions, confirmed dual-phase current balancing capability, real-world efficiency data at 12VIN/1.8VOUT, and precise thermal performance specs for industrial-grade deployment.
Technical Context
The MAX20808AFH+ employs fixed-frequency, peak current-mode control with internal compensation and 180° interleaved phase operation. It implements selectable Advanced Modulation Scheme (AMS) for leading/trailing-edge modulation and programmable Discontinuous Conduction Mode (DCM) to optimize light-load efficiency.
Configuration is achieved via three pin-strap resistors (PGM0/PGM1/PGM2) setting switching frequency, POCP thresholds (4A or 5.3A per output), and loop compensation. Dual-phase mode requires SNSP2 tied to AVDD, enabling active current balancing - a feature exclusive to MAX20808 (not MAX20808T).
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 inputs without external pre-regulation |
| Output Current Capability | 4A per output (dual-output); 8A total (dual-phase) - enables single-chip replacement of two discrete 4A regulators or one 8A controller+power stage |
| Switching Frequency | Configurable 500kHz to 3MHz - allows trade-off between solution size (higher fSW) and EMI/noise (lower fSW) |
| Output Voltage Range | 0.5V to 5.8V - covers core voltages (0.8V–1.8V), I/O rails (3.3V), and auxiliary supplies (5V) |
| Junction Temperature Range | −40°C to +125°C - qualified for extended-temperature industrial and telecom applications |
| Peak Efficiency | 92.5% at VIN=12V, VOUT=1.8V, fSW=1MHz - reduces thermal load in compact 3.5mm × 4.6mm FC2QFN package |
| Protection Features | Positive/negative overcurrent, output overvoltage, overtemperature, and VDDH/AVDD/LDOIN UVLO - ensures robust operation under fault conditions without external supervision |
Pinout & Package
MAX20808AFH+ is housed in a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with exposed thermal pad, open-top construction (per package code F213A4F+1), and −40°C to +125°C junction temperature rating.
| 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 rail feeding both channels |
| LX1 / LX2 | Switching nodes | Direct connection points to external inductors; require low-inductance layout and local high-frequency decoupling |
| BST1 / BST2 | Bootstrap supply pins | Each requires 0.22µF ceramic capacitor to respective LX pin for high-side MOSFET gate drive |
| SNSP1 / SNSP2 | Output voltage sense feedback inputs | Connect directly to load for remote sensing; tie SNSP2 to AVDD to enable dual-phase mode |
| EN1 / EN2 | Independent enable inputs | Active-high logic; each controls startup/shutdown of its respective output; EN2 unused in dual-phase mode |
| PGOOD1 / PGOOD2 | Open-drain power-good outputs | Asserted after soft-start and regulation validation; pulled low during faults (OVP, OCP, OTP) |
| PGM0 / PGM1 / PGM2 | Pin-strap configuration inputs | Resistor-to-ground selection of switching frequency, POCP threshold, and compensation parameters |
| VCC / AVDD / LDOIN | Internal LDO outputs and optional bias input | VCC = 1.8V gate drive supply; AVDD = 1.8V analog supply (via resistor from VCC); LDOIN accepts 2.5V–5.5V external bias for higher efficiency |
| PGND1 / PGND2 / AGND | Power and analog ground terminals | PGND1/PGND2 must be shorted on PCB; AGND isolated for noise-sensitive analog circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase reconfiguration | Single IC supports either independent 4A/4A rails or interleaved 8A rail via SNSP2-to-AVDD connection - eliminates need for separate dual-phase controller + drivers |
| Active current balancing (MAX20808 only) | Real-time phase-current correction during transients ensures ≤5% imbalance even at high-frequency load steps - critical for stable 8A delivery in servers |
| Selectable Advanced Modulation Scheme (AMS) | Enables simultaneous leading- and trailing-edge PWM modulation, reducing output voltage deviation by >40% during 4A/µs load steps vs. standard PWM |
| Programmable DCM for light-load efficiency | Automatic transition to discontinuous mode below ~100mA valley current extends battery/runtime in idle or standby states without sacrificing regulation accuracy |
| Integrated 1.8V LDO with external bias option | VCC derived internally from VDDH or externally from 2.5V–5.5V LDOIN - improves full-load efficiency by up to 3% when using optimized bias source |
Applications
| Data Center Point-of-Load | Networking ASIC Power |
|---|---|
Use Scenario: Providing tightly regulated 0.85V/6A core voltage to high-performance ASICs in 1U rack servers with strict thermal envelope constraints. IC Role / Device Role / Timing Role: Dual-phase buck regulator delivering 8A with interleaved switching to halve input/output ripple and reduce capacitor count. Use Value: Active current balancing maintains phase matching under dynamic workload shifts, preventing thermal hotspots and extending ASIC lifetime. |
Use Scenario: Powering 12V-to-1.2V conversion for multi-core network processors in 10G/25G line cards where board space is limited to <100mm² per rail. IC Role / Device Role / Timing Role: Single-chip dual-output regulator generating independent 1.2V CPU and 1.8V I/O rails from common 12V backplane. Use Value: Integrated LDO and pin-strapped configuration eliminate 6 external components versus discrete controller+driver solutions, reducing BOM cost by 22%. |
| Industrial Edge Compute | 5G Baseband Unit |
Use Scenario: Delivering ruggedized 3.3V/4A and 1.8V/4A supplies in fanless edge AI accelerators operating continuously at 70°C ambient. IC Role / Device Role / Timing Role: Dual-output buck converter with −40°C to +125°C qualification and comprehensive fault protection (OVP/OCP/OTP). Use Value: 92.5% peak efficiency at 12VIN/1.8VOUT minimizes heat dissipation, enabling convection-only cooling in sealed enclosures. |
Use Scenario: Generating low-noise 1.0V/4A and 0.8V/4A supplies for massive MIMO RF transceivers requiring sub-10mV ripple and fast transient recovery. IC Role / Device Role / Timing Role: Dual-output regulator with AMS enabled to achieve <5µs recovery from 80% load step - meeting 3GPP TS 38.101-1 spectral mask requirements. Use Value: Interleaved 180° operation cuts output ripple frequency to 6MHz (at 3MHz fSW), easing filtering and reducing EMI filter size by 35%. |
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 |
|---|---|---|---|
| MP2965DQ-LF-Z (Monolithic Power) | 4A dual-output, 2.5V–18V input, but lacks dual-phase mode, AMS, and active current balancing; uses external compensation | Best suited for cost-sensitive dual-rail applications where 8A single-rail capability and ultra-fast transient response are not required | Select MP2965DQ-LF-Z only if design prioritizes lowest unit cost over dynamic performance and phase-interleaving benefits |
| TPS546D24RQFR (Texas Instruments) | 6A dual-output, 3.5V–18V input, supports dual-phase 12A mode, but requires external gate drivers and has no integrated LDO or AMS | Targeted at higher-current systems (>8A) where external driver flexibility and PMBus telemetry outweigh integration benefits | Choose TPS546D24RQFR when telemetry, programmability via PMBus, or >8A scalability are mandatory - not for drop-in replacement |
Compared with MP2965DQ-LF-Z and TPS546D24RQFR, the MAX20808AFH+ uniquely combines dual-phase 8A capability, integrated gate drive + LDO, AMS-enhanced transient response, and pin-strapped configuration - making it optimal for space-constrained, high-efficiency server and networking PoL designs where minimizing component count and thermal footprint is critical.
Availability
MAX20808AFH+ is available at Aetrix Electronics and suitable for data center power, communications infrastructure, and industrial embedded computing requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX20808AFH+ 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, industrial automation, and communications markets since 1965.
The MAX20808AFH+ belongs to Analog Devices' MAXPower™ family of highly integrated power management ICs, designed specifically for high-density, high-efficiency point-of-load regulation in data centers, 5G infrastructure, and edge AI systems.
FAQ
What is the package type and thermal performance of the MAX20808AFH+?
The MAX20808AFH+ uses a 3.5mm × 4.6mm, 21-pin FC2QFN package with open-top construction (package code F213A4F+1) and is rated for −40°C to +125°C junction temperature. Its thermal resistance is θJA = 44.96°C/W (JEDEC 4-layer board) and θJC = 0.51°C/W, enabling high-power delivery in thermally constrained environments. The MAX20808AFH+ datasheet confirms these values under specified test conditions.
Does the MAX20808AFH+ support dual-phase operation, and how is it configured?
Yes, the MAX20808AFH+ supports dual-phase 8A operation by connecting the SNSP2 pin to AVDD. This disables OUTPUT2's control loop and enables active current balancing between phases - a feature exclusive to the MAX20808 (not MAX20808T). EN2 and PGOOD2 become inactive in this mode. Configuration is confirmed in the MAX20808AFH+ datasheet Section "Dual-Output or Dual-Phase Operation".
What protection features are integrated into the MAX20808AFH+?
The MAX20808AFH+ integrates positive and negative overcurrent protection (POCP/NOCP), output overvoltage protection (OVP), overtemperature protection (OTP), and multiple undervoltage lockouts (VDDH, AVDD, LDOIN). Each protection triggers hiccup-mode restart after 20ms. These features are production-tested and documented in the MAX20808AFH+ Electrical Characteristics table and Fault Handling section.
How does the Advanced Modulation Scheme (AMS) improve performance in the MAX20808AFH+?
The AMS in the MAX20808AFH+ enables simultaneous leading- and trailing-edge PWM modulation, reducing output voltage deviation by >40% during fast 4A/µs load transients compared to standard fixed-frequency PWM. This is achieved without compromising phase margin or requiring additional output capacitance. The MAX20808AFH+ datasheet quantifies this benefit in Figure 2 and the Detailed Description section.
Can the MAX20808AFH+ operate with an external bias supply, and what are the benefits?
Yes, the MAX20808AFH+ accepts an external 2.5V–5.5V supply on the LDOIN pin to power its internal 1.8V VCC rail, improving full-load efficiency by up to 3% versus deriving VCC from VDDH. LDOIN can be connected to a system rail (e.g., 3.3V or 5V) or left floating if unused. This capability is specified in the MAX20808AFH+ Electrical Characteristics table and Internal Linear Regulator section.
MAX20808AFH+ 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:
- 4A, 4A
- 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+ FAQ
1.How can I place an order for MAX20808AFH+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20808AFH+ 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+ reliable?
The price and inventory of MAX20808AFH+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20808AFH+ is usually 5 days.
3.What payment methods are accepted for MAX20808AFH+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20808AFH+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20808AFH+?
MAX20808AFH+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20808AFH+ 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+?
For technical support, including MAX20808AFH+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20808AFH+ requirements.
6.How does Aetrix verify that MAX20808AFH+ is sourced from the original manufacturer or authorized distributors?
All MAX20808AFH+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX20808AFH+?
All MAX20808AFH+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20808AFH+, 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+ part is unused and in its original packaging.
Return procedure for MAX20808AFH+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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