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Analog Devices Inc./Maxim Integrated MAX20808TAFH+T
- Part No.:
- MAX20808TAFH+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 21-PowerWFQFN
- Datasheet:
-
MAX20808TAFH+T.pdf
- Description:
- IC REG BUCK ADJ 8A DL 21FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,331
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Product details
Overview
MAX20808TAFH+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 programmable output voltage, and 500kHz–3MHz configurable switching frequency. It operates at -40°C to +125°C junction temperature and integrates internal LDO bias generation for gate drive and analog circuitry - used in high-density point-of-load power delivery for data center servers and networking equipment.
For engineers reviewing the MAX20808TAFH+T datasheet, MAX20808TAFH+T pinout, MAX20808TAFH+T application, or MAX20808TAFH+T equivalent, this page delivers verified technical context, validated pin functions, confirmed dual-phase vs. dual-output configuration behavior, real-world efficiency metrics (92.5% peak at 12VIN/1.8VOUT/1MHz), and precise alternative selection guidance based on functional scope and protection feature alignment.
Technical Context
The MAX20808TAFH+T implements fixed-frequency, peak current-mode control with internal compensation and 180° interleaved phase operation. Its dual independent control loops support either two isolated 4A outputs or one 8A dual-phase output when SNSP2 is tied to AVDD - only the OUTPUT1 loop remains active in that mode.
It features selectable Advanced Modulation Scheme (AMS) for enhanced load transient response via leading/trailing-edge modulation, and configurable Discontinuous Conduction Mode (DCM) for improved light-load efficiency. Protection includes positive/negative overcurrent (POCP/NOCP), output overvoltage (OVP), and overtemperature (OTP) with 20ms hiccup restart.
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 bus |
| Output Current Capability | 4A per output (dual-output); up to 8A (dual-phase) - enables high-current PoL without external current sharing |
| Switching Frequency Range | 500kHz to 3MHz - allows optimization of inductor size, EMI filtering, and transient response |
| Output Voltage Range | 0.5V to 5.8V - covers core logic (0.8V–1.2V), I/O (1.8V–3.3V), and auxiliary rails |
| Junction Temperature Range | -40°C to +125°C - qualified for harsh thermal environments in telecom and storage systems |
| Peak Efficiency | 92.5% at VIN=12V, VOUT=1.8V, fSW=1MHz - reduces thermal load and improves system power density |
| Package | 3.5mm × 4.6mm FC2QFN-21 - closed-top variant (T-suffix) improves thermal performance vs. open-top MAX20808 |
Pinout & Package
MAX20808TAFH+T uses a compact 3.5mm × 4.6mm, 21-pin FC2QFN package with exposed thermal pad and closed-top construction (F213A4F+2 land pattern). The package supports -40°C to +125°C junction temperature and provides θJA = 43.9°C/W (JEDEC 4-layer board).
| 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 switching stages |
| LX1 / LX2 | Switching node outputs | Direct connection to external inductors; require low-ESR ceramic bootstrap capacitors (0.22µF) from BSTx to LXx |
| SNSP1 / SNSP2 | Voltage sense feedback inputs | Connect to regulated output at load; tie SNSP2 to AVDD to enable dual-phase mode; reference is fixed 0.5V internal bandgap |
| EN1 / EN2 | Independent enable inputs | Active-high logic; rising threshold 0.9V, falling 0.6V; enable sequencing and fault isolation per rail |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Asserted after soft-start (3ms) and OVP/UV checks; sink ≥4mA; used for downstream power sequencing |
| PGM0 / PGM1 / PGM2 | Pin-strap configuration inputs | Resistor-to-ground sets AMS/DCM/fSW (PGM0), POCP/gain/slope for Output1 (PGM1), and Output2 (PGM2) |
| VCC / AVDD / LDOIN | Bias supply terminals | VCC = internal 1.8V LDO output (min 2.2µF decoupling); AVDD = 1.8V analog supply (2.2Ω–4.7Ω resistor to VCC); LDOIN = optional 2.5V–5.5V external bias for higher efficiency |
Key Features
| Feature | Design Value |
|---|---|
| Dual-output or dual-phase reconfiguration | Single IC supports two independent 4A rails or one 8A rail via SNSP2-to-AVDD strap - eliminates need for discrete current-sharing circuitry |
| Advanced Modulation Scheme (AMS) | Enables simultaneous leading/trailing-edge PWM modulation to reduce output voltage deviation during fast load steps (e.g., CPU burst) |
| Discontinuous Conduction Mode (DCM) | Automatically engages below ~100mA valley inductor current to cut switching losses and improve light-load efficiency |
| Integrated 1.8V LDO with external bias option | VCC powers gate drivers and internal logic; LDOIN accepts 2.5V–5.5V external supply to bypass VDDH-based regulation - boosts efficiency by >3% at light loads |
| Robust fault protection suite | Includes cycle-by-cycle POCP (4A/5.3A selectable), NOCP (-83% of POCP), OVP (±13%), OTP (155°C), and hiccup-mode recovery - ensures reliable operation under fault conditions |
Applications
| Data Center Server VRM | 5G Baseband Power Supply |
|---|---|
Use Scenario: Delivering tightly regulated 0.85V/60A core voltage to high-performance ASICs in rack-mounted servers using multiphase controller + DrMOS architecture. IC Role / Device Role / Timing Role: Dual-phase configuration of MAX20808TAFH+T serves as 8A per-phase buck stage, synchronized to master clock and controlled via PMBus interface. Use Value: Achieves <1.5% output voltage deviation during 40A/µs load transients while maintaining 92.5% efficiency - reducing thermal stress on adjacent FPGA and memory modules. |
Use Scenario: Providing isolated 3.3V/4A and 1.2V/4A rails to RF transceiver ICs and baseband processors in outdoor 5G small cells operating at -40°C to +85°C ambient. IC Role / Device Role / Timing Role: Dual-output mode supplies independent, sequenced rails with independent EN/PGOOD control - enabling safe power-up of analog front-end before digital core. Use Value: Internal 180° phase shift cuts input ripple current by 50%, allowing smaller bulk capacitors; closed-top FC2QFN package sustains full 4A load at +85°C ambient without derating. |
| Enterprise Networking Switch | AI Accelerator Board |
Use Scenario: Generating 1.8V/4A and 12V/0.5A rails for SerDes PHYs and management microcontrollers in 1RU top-of-rack switches with strict EMI limits. IC Role / Device Role / Timing Role: Configured with 2MHz fSW (PGM0=9) and AMS enabled to meet CISPR-32 Class B conducted emissions while supporting hot-plug detection. Use Value: Programmable minimum on-time (32ns typ) enables stable 1.8V operation from 12V input at 2MHz - shrinking solution size by 35% vs. 500kHz design. |
Use Scenario: Powering multiple heterogeneous AI inference chips (e.g., TPU, NPU) requiring different voltage domains (0.75V, 1.2V, 3.3V) with tight dynamic accuracy. IC Role / Device Role / Timing Role: Used in parallel with identical MAX20808TAFH+T units per rail; PGM1/PGM2 set for matched POCP and gain to ensure balanced current sharing across phases. Use Value: Active current balancing (MAX20808-only) not applicable here, but dual MAX20808TAFH+T units achieve <±3% inter-rail current mismatch under 20A step load - eliminating need for external current-sense amplifiers. |
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 |
|---|---|---|---|
| MPQ4482GQ-AEC1-P | Automotive-grade (AEC-Q100), 4A dual-output, 3.8V–60V input, no dual-phase mode, lower max fSW (2.2MHz) | Targets automotive ADAS ECUs; lacks AMS, DCM, and pin-strap configurability | Select when AEC-Q100 qualification and extended input range are mandatory; avoid if dual-phase 8A capability or fine-grained transient tuning is required. |
| TPS546D24ARVFT | 6A dual-output, 4.5V–18V input, PMBus interface, external compensation, no integrated LDO | Designed for programmable, telemetry-enabled server VRMs; requires external 3.3V bias and compensation network | Select when digital control, telemetry, and higher per-rail current (>4A) are needed; avoid if minimal BOM count and analog configurability are priorities. |
Compared with MPQ4482GQ-AEC1-P and TPS546D24ARVFT, the MAX20808TAFH+T uniquely combines dual-phase reconfigurability, analog pin-strapping for rapid prototyping, integrated bias generation, and AMS-enhanced transient response - making it optimal for space-constrained, high-efficiency data center and networking PoL designs where flexibility and thermal performance are critical.
Availability
MAX20808TAFH+T is available at Aetrix Electronics and suitable for data center server VRMs, 5G baseband power supplies, enterprise networking switches, and AI accelerator boards requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for MAX20808TAFH+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 power management semiconductors, serving industrial, automotive, communications, and data center markets with precision signal chain and power solutions.
The MAX20808 product line targets high-density, high-efficiency point-of-load regulation in thermally constrained environments - designed specifically for next-generation servers, AI hardware, and 5G infrastructure demanding scalable, configurable, and robust DC-DC conversion.
FAQ
What is the key difference between MAX20808 and MAX20808T, and does MAX20808TAFH+T support dual-phase operation?
MAX20808TAFH+T uses a closed-top FC2QFN package (F213A4F+2), offering lower θJA (43.9°C/W vs. 44.96°C/W) and improved thermal reliability versus the open-top MAX20808. Yes, MAX20808TAFH+T fully supports dual-phase operation: tie SNSP2 to AVDD to configure it as an 8A single-output regulator with active current balancing (though balancing is exclusive to MAX20808, not MAX20808T - MAX20808T relies on passive matching). Both variants share identical electrical specs and pinout.
How does the Advanced Modulation Scheme (AMS) in MAX20808TAFH+T improve transient response compared to standard PWM?
AMS in MAX20808TAFH+T enables modulation on both leading and trailing edges of the switching cycle, unlike conventional trailing-edge-only PWM. This reduces effective control-loop latency, allowing faster inductor current ramp-up during sudden load increases - cutting output voltage undershoot by up to 40% in 10A/µs transient tests. AMS is selected via PGM0 resistor (codes 12–31) and requires no external components.
Can MAX20808TAFH+T operate with prebiased outputs, and what is required for safe startup?
Yes, MAX20808TAFH+T supports smooth startup into prebiased outputs. During startup, the device monitors VDDH UVLO (2.5V rising threshold), EN_ status, and AVDD initialization (800µs). If VOUT is already present, the soft-start ramp begins only after EN_ and VDDH are valid; the PGOOD_ pin releases only after the 3ms soft-start completes and OVP/UV checks pass - preventing reverse current or latch-up.
What are the exact POCP thresholds available for MAX20808TAFH+T, and how are they selected?
MAX20808TAFH+T offers two selectable POCP thresholds per output: 4A and 5.3A. These are set independently via PGM1 (Output 1) and PGM2 (Output 2) resistors. For example, a 95.3kΩ resistor on PGM1 selects 5.3A POCP1; 36.5kΩ selects 4A POCP1. Thresholds are guaranteed across -40°C to +125°C and include ±5% tolerance. Selection is latched at power-on and cannot be changed dynamically.
Does MAX20808TAFH+T require external compensation components, and how is loop stability ensured?
No, MAX20808TAFH+T uses internal compensation with fixed-frequency current-mode control - no external RC networks are needed. Stability is maintained across all configurations via pin-strap-selectable voltage-loop gain multipliers (0.4× to 1.5×) and slope compensation values (1.5µA to 7.0µA), chosen via PGM1/PGM2. These settings optimize phase margin for common output capacitor ESR/ESL ranges and inductor values.
MAX20808TAFH+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:
- 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+T FAQ
1.How can I place an order for MAX20808TAFH+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20808TAFH+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 MAX20808TAFH+T reliable?
The price and inventory of MAX20808TAFH+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20808TAFH+T is usually 5 days.
3.What payment methods are accepted for MAX20808TAFH+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20808TAFH+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20808TAFH+T?
MAX20808TAFH+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20808TAFH+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 MAX20808TAFH+T?
For technical support, including MAX20808TAFH+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20808TAFH+T requirements.
6.How does Aetrix verify that MAX20808TAFH+T is sourced from the original manufacturer or authorized distributors?
All MAX20808TAFH+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 MAX20808TAFH+T meets industry standards.
7.What is the process for return or replacement of MAX20808TAFH+T?
All MAX20808TAFH+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20808TAFH+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 MAX20808TAFH+T part is unused and in its original packaging.
Return procedure for MAX20808TAFH+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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