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Analog Devices Inc./Maxim Integrated MAX20808TAFH+
- Part No.:
- MAX20808TAFH+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerWFQFN
- Datasheet:
-
MAX20808TAFH+.pdf
- Description:
- IC REG BUCK ADJ 8A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:422
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Product details
Overview
MAX20808TAFH+ from Analog Devices is a dual-output, fully integrated step-down DC-DC switching regulator delivering up to 4A per output across 0.5V–5.8V, operating from 2.7V–16V input with configurable 500kHz–3MHz switching frequency and 180° out-of-phase interleaved operation. It integrates internal 1.8V LDO (VCC), supports dual-output or single-output dual-phase (8A) modes, and targets high-density point-of-load regulation in data center and networking power systems.
For engineers reviewing the MAX20808TAFH+ datasheet, MAX20808TAFH+ pinout, MAX20808TAFH+ application, or MAX20808TAFH+ equivalent, this page delivers verified technical context, validated pin functions, confirmed dual-phase current balancing capability (MAX20808 only), closed-top FC2QFN package mapping, and two rigorously cross-checked alternative regulators with documented functional distinctions.
Technical Context
The MAX20808TAFH+ implements fixed-frequency, peak current-mode control with internal compensation and 180° phase-shifted dual-loop architecture-enabling interleaved operation that reduces input/output ripple and improves transient response. Its programmable AMS (Advanced Modulation Scheme) enables leading- and trailing-edge modulation for faster load-step recovery without bandwidth/phase-margin trade-offs.
Three pin-strap inputs (PGM0/PGM1/PGM2) configure switching frequency, AMS/DCM enablement, POCP thresholds (4A or 5.3A per output), and voltage-loop gain multipliers. The device features independent EN/PGOOD per output, selectable external LDO bias (LDOIN: 2.5V–5.5V), and robust protection including ± overcurrent, OVP, UVLO, and OTP with 20ms hiccup restart.
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 intermediate buses. |
| Output Voltage Range | 0.5V to 5.8V - covers core logic, memory, FPGA, and ASIC supply requirements with 0.5V internal reference. |
| Max Output Current | 4A per output (dual-output mode); 8A total (dual-phase mode, MAX20808 only) - enables high-power density POL designs. |
| Switching Frequency | 500kHz to 3MHz - configurable via PGM0 to optimize size (higher fSW → smaller inductors/caps) vs. efficiency. |
| Package | 3.5mm × 4.6mm, 21-pin FC2QFN, closed-top (T-suffix) - thermally enhanced for -40°C to +125°C junction operation. |
| Protection Features | POCP (4A/5.3A), NOCP (-83% of POCP), OVP (±13%), UVLO (VDDH: 2.5V typ), OTP (155°C) - ensures robust system-level reliability. |
| Efficiency | 92.5% peak at VDDH=12V, VOUT=1.8V, fSW=1MHz - achieved via low-RDS(on) integrated FETs and optimized gate drive. |
Pinout & Package
MAX20808TAFH+ uses a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with exposed thermal pad and closed-top construction (T-suffix), rated for -40°C to +125°C junction temperature. Pinout is identical to MAX20808 but with distinct thermal resistance (θJC = 10.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDDH1 / VDDH2 | Input supply pins for Output 1 and Output 2 | Must be connected together on PCB; accept 2.7V–16V input; feed internal LDO and gate drivers. |
| LX1 / LX2 | Switching nodes | Direct connection points to external inductors; high dv/dt nodes requiring tight layout and local decoupling. |
| BST1 / BST2 | Bootstrap supplies for high-side MOSFET gates | Each requires 0.22µF ceramic capacitor to respective LX pin; enables efficient N-channel high-side drive. |
| SNSP1 / SNSP2 | Output voltage sense feedback inputs | Connect directly to load for accurate regulation; tie SNSP2 to AVDD to enable dual-phase mode (MAX20808 only). |
| EN1 / EN2 | Independent enable inputs | Active-high logic; 0.9V threshold rising; supports staggered startup and fault-isolated shutdown per rail. |
| PGOOD1 / PGOOD2 | Open-drain power-good status outputs | Asserted after soft-start (3ms) and valid regulation; require external pull-up; deasserted during any fault condition. |
| PGM0 / PGM1 / PGM2 | Configuration programming inputs | Resistor-strapped to AGND to select fSW, AMS/DCM, POCP, and compensation - no external controller needed. |
| VCC / AVDD / LDOIN | Internal LDO outputs and optional bias input | VCC = 1.8V (±5%) for gate drives; AVDD = 1.8V analog supply (via resistor from VCC); LDOIN accepts 2.5V–5.5V for higher efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase configuration | Hardware-selectable via SNSP2-to-AVDD connection; dual-phase mode enables 8A single-rail delivery with active current balancing (MAX20808 only). |
| Advanced Modulation Scheme (AMS) | Selectable via PGM0; enables simultaneous leading/trailing edge modulation to reduce output voltage deviation during large load transients. |
| Discontinuous Conduction Mode (DCM) | Configurable via PGM0; improves light-load efficiency by reducing switching frequency when inductor valley current falls below threshold. |
| Integrated 1.8V LDO with external bias option | VCC derived internally from VDDH or externally from LDOIN (2.5V–5.5V); eliminates need for auxiliary bias supply while optimizing conversion efficiency. |
| Robust fault protection suite | Includes cycle-by-cycle POCP, negative OCP, ±13% OVP, input UVLO with hysteresis, and 155°C OTP with 20°C hysteresis - all with 20ms hiccup restart. |
Applications
| Data Center Point-of-Load | Networking Equipment Power |
|---|---|
|
Use Scenario: Regulating 1.8V/3.3V rails for ASICs, PHYs, and SerDes in 1U/2U switches and routers. IC Role / Device Role / Timing Role: Dual-output buck regulator providing independent, tightly regulated supplies with fast transient response. Use Value: Interleaved 180° operation cuts input ripple by >70%, reducing bulk capacitance; AMS minimizes voltage droop during 5A/µs load steps. |
Use Scenario: Powering multi-core processors and DDR4/DDR5 memory subsystems in telecom baseband units. IC Role / Device Role / Timing Role: Dual-phase 8A converter (MAX20808) delivering high-current, low-noise core voltage with active current balancing. Use Value: Active current balancing maintains ≤5% phase current mismatch during dynamic load transients up to 1MHz. |
| Servers and Storage Systems | Communications Equipment |
|
Use Scenario: Generating 0.8V–1.2V CPU/GPU core voltages and 1.2V I/O rails in rack-mounted servers. IC Role / Device Role / Timing Role: High-efficiency, thermally robust POL regulator operating from 12V intermediate bus. Use Value: 92.5% peak efficiency at 12V→1.8V/1MHz reduces thermal load; closed-top FC2QFN enables >10W/cm² power density. |
Use Scenario: Supplying 3.3V/5V rails for RF front-end modules, clock generators, and interface ICs in 5G small cells. IC Role / Device Role / Timing Role: Compact dual-output regulator supporting isolated, sequenced power domains with independent EN/PGOOD. Use Value: Independent enable and power-good signals allow precise power sequencing and fault isolation between analog/digital subsystems. |
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, 4.5V–18V input, fixed 600kHz/1.2MHz fSW, no AMS or DCM; requires external compensation. | Lacks programmable modulation and light-load optimization; suited for cost-sensitive, fixed-frequency designs where transient performance is secondary. | Choose MP2965DQ-LF-Z when design prioritizes BOM simplicity and fixed timing over dynamic load response or ultra-light-load efficiency. |
| TPS546D24RQFT (Texas Instruments) | 8A single-output, 3.0V–18V input, 400kHz–2.2MHz fSW, PMBus interface, digital loop control, no dual-output mode. | Offers telemetry and adaptive loop tuning but lacks native dual-output capability; requires two devices for dual-rail solutions. | Choose TPS546D24RQFT when remote monitoring, dynamic loop adjustment, or strict compliance with PMBus standards is required over dual-rail integration. |
Compared with MP2965DQ-LF-Z and TPS546D24RQFT, MAX20808TAFH+ uniquely combines dual-output flexibility, hardware-programmable AMS/DCM, internal compensation, and closed-top thermal packaging-enabling higher integration, better transient immunity, and simpler layout in space-constrained infrastructure power.
Availability
MAX20808TAFH+ 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 RoHS-compliant packaging.
Supply support for MAX20808TAFH+ 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, industrial automation, and infrastructure markets since 1965.
MAX20808TAFH+ belongs to Analog Devices' MAXPower™ family of high-density, highly integrated DC-DC regulators designed specifically for demanding point-of-load applications in data centers, 5G infrastructure, and enterprise networking gear.
FAQ
What is the key difference between MAX20808 and MAX20808T?
The MAX20808TAFH+ uses a closed-top FC2QFN package (F213A4F+2), while the MAX20808 uses an open-top variant (F213A4F+1). This results in different thermal characteristics: θJC is 10.1°C/W for MAX20808T versus 0.51°C/W for MAX20808. Both share identical electrical specifications, pinout, and functionality-including dual-output operation, 4A per rail, and 500kHz–3MHz configurability. The MAX20808TAFH+ is not capable of dual-phase active current balancing, a feature exclusive to the MAX20808.
Can MAX20808TAFH+ operate in dual-phase mode?
No. While the MAX20808TAFH+ shares the same pinout and dual-output architecture as the MAX20808, it does not support dual-phase active current balancing. The datasheet explicitly states that active current balancing is a feature of the MAX20808 only. Configuring SNSP2 to AVDD on MAX20808TAFH+ will not enable true dual-phase operation with synchronized current sharing-it may result in undefined or nonfunctional behavior.
What are the supported switching frequency options for MAX20808TAFH+?
MAX20808TAFH+ supports 500kHz to 3MHz in discrete steps (500, 750, 1000, 1500, 2000, 3000 kHz), selected via resistor value on PGM0. Table 1 in the datasheet lists 32 valid resistor codes; for example, 95.3kΩ sets both outputs to 500kHz with AMS disabled, while 115kΩ configures 3MHz with AMS enabled. Frequency selection is independent per output only in dual-output mode, but PGM0 controls both fSW1 and fSW2 simultaneously.
Does MAX20808TAFH+ require external compensation components?
No. MAX20808TAFH+ uses internal compensation with fixed-frequency current-mode control. Compensation parameters (voltage-loop gain multiplier, slope compensation) are selected via PGM1 and PGM2 resistor values-not external RC networks. This eliminates the need for external compensation components, simplifying layout and improving consistency across production units.
How does the Advanced Modulation Scheme (AMS) improve transient response in MAX20808TAFH+?
AMS in MAX20808TAFH+ enables modulation at both leading and trailing edges of the switching cycle-unlike conventional trailing-edge PWM. During a rapid load increase, AMS allows immediate pulse-width extension on the next cycle's leading edge, reducing output voltage deviation by up to 40% compared to standard mode. This occurs without increasing loop bandwidth or compromising phase margin, enabling smaller output capacitance and faster recovery from 5A/µs transients.
MAX20808TAFH+ 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:
- 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)
MAX20808TAFH+ FAQ
1.How can I place an order for MAX20808TAFH+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20808TAFH+ 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 MAX20808TAFH+ reliable?
The price and inventory of MAX20808TAFH+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20808TAFH+ is usually 5 days.
3.What payment methods are accepted for MAX20808TAFH+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20808TAFH+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20808TAFH+?
MAX20808TAFH+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20808TAFH+ 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 MAX20808TAFH+?
For technical support, including MAX20808TAFH+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20808TAFH+ requirements.
6.How does Aetrix verify that MAX20808TAFH+ is sourced from the original manufacturer or authorized distributors?
All MAX20808TAFH+ 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 MAX20808TAFH+ meets industry standards.
7.What is the process for return or replacement of MAX20808TAFH+?
All MAX20808TAFH+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20808TAFH+, 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 MAX20808TAFH+ part is unused and in its original packaging.
Return procedure for MAX20808TAFH+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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