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Analog Devices Inc./Maxim Integrated MAX20408AFOD/VY+T
- Part No.:
- MAX20408AFOD/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOD/VY+T.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,506
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Product details
Overview
MAX20408AFOD/VY+T from Analog Devices is an automotive-grade, fully integrated synchronous buck converter with internal high-side and low-side MOSFETs, delivering up to 8A output current from a 3.0V–36V input. It features 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, ±1% output voltage accuracy (E-grade), and AEC-Q100 qualification for use in ADAS power rails.
For engineers reviewing the MAX20408AFOD/VY+T datasheet, MAX20408AFOD/VY+T pinout, MAX20408AFOD/VY+T application, or MAX20408AFOD/VY+T equivalent, key selection criteria include dropout operation at 99% duty cycle, dual-phase scalability to 20A, windowed PGOOD monitoring, and FC2QFN thermal performance in space-constrained automotive modules.
Technical Context
The MAX20408AFOD/VY+T implements average current-mode control with 34ns minimum on-time, enabling stable regulation across wide VIN/VOUT ratios (e.g., 12V→3.3V or 24V→5V) without pulse-skipping artifacts. Its dual-phase capability uses VEA coupling and SYNCOUT-to-SYNC interconnection to achieve dynamic current sharing and precise 180° phase alignment between controller and target ICs.
It integrates a 1.8V BIAS linear regulator with automatic switchover from input to output, supports programmable EN threshold (0.825V–0.975V), and includes spread-spectrum modulation (±3% around fSW) to reduce EMI peaks-disabled only when externally synchronized. Thermal shutdown activates at +175°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports cold-crank (3V) and load-dump (42V transient) conditions per ISO 7637-2. |
| Max Output Current | 8A - sustained delivery with thermal derating; enables single-chip supply for radar SoCs or display controllers. |
| Quiescent Current | 10μA in skip mode - extends battery runtime in always-on vehicle modules (e.g., telematics wake-up circuits). |
| Switching Frequency | 2.1MHz or 400kHz - selects small inductors (e.g., 0.47μH @ 2.1MHz) and avoids AM band interference. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures tight regulation for sensitive analog sensors or SerDes PHYs. |
| Duty Cycle Max | 99% - maintains regulation during deep dropout (e.g., 5V out from 5.05V input), critical for post-buck hold-up. |
| PGOOD Window | 102.75%–107.25% (rising), 101.75%–106.25% (falling) - detects overvoltage and undervoltage faults independently. |
| Thermal Protection | 175°C shutdown with 20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
Pinout & Package
MAX20408AFOD/VY+T is housed in a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad. Symmetric SUP/PGND pin placement minimizes high-current loop area and improves EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN | Enable Input | High-voltage compatible (3V–36V); 0.825V–0.975V threshold enables direct connection to MCU GPIO or battery monitor. |
| BST | Bootstrap Supply | Connects 0.1μF ceramic capacitor to LX; sustains high-side gate drive during continuous conduction. |
| SUP (Pins 3 & 9) | IC Power Input | Dual pins internally connected; bypass each with 0.1μF + 4.7μF ceramics to PGND for low-impedance VIN path. |
| PGND (Pins 4, 5, 7, 8) | Power Ground | Four dedicated pins minimize ground bounce and thermal resistance; must be tied to thermal pad and PCB plane. |
| LX | Switch Node | Connects to buck inductor; high-impedance when disabled; requires tight layout to reduce EMI and ringing. |
| BIAS | 1.8V LDO Output | Powers internal circuitry; requires ≥2.2μF ceramic to GND; auto-switches from VIN to VOUT after startup. |
| FB | Feedback Input | Connects to resistor divider for adjustable output (0.8V–10V) or to BIAS for fixed-output configuration. |
| OUT | Output Sense | Used with FB-to-BIAS connection to sense regulated output directly, improving load regulation accuracy. |
| VEA | Error Amplifier Output | Shared between controller/target in dual-phase; enables matched current sharing and transient response. |
| PGOOD | Open-Drain Status | Windowed indicator (102.75%–107.25% rising); requires external pull-up to BIAS or ≤5.5V rail. |
| SYNC | Mode Control Input | Low = skip mode; high = FPWM; external clock = sync mode - configures operating behavior without reprogramming. |
| SYNCOUT | 180° Clock Output | Drives SYNC of target IC in dual-phase; connect to BIAS to configure as target device. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX20408AFOD/VY+T ICs deliver up to 20A with dynamic current sharing and 180° phase offset - eliminates need for external current-sharing ICs. |
| Windowed PGOOD | Independent rising/falling thresholds (102.75%/101.75%) detect both overvoltage and undervoltage faults - enhances system-level safety compliance (e.g., ISO 26262 ASIL-B). |
| Thermally optimized FC2QFN | θJCb = 7.7°C/W and θJB = 9.9°C/W (EV kit) - sustains 8A output at +85°C ambient without forced airflow. |
| Dropout operation | 99% duty cycle enables regulation down to VIN – VDROP ≈ 5.05V → 5V, supporting start-stop engine scenarios where battery dips to 6V. |
| Spread-spectrum EMI reduction | ±3% triangular modulation at 4.5kHz (2.1MHz) lowers peak radiated emissions by >10dB - simplifies EMC filter design in infotainment head units. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit response (25ms off-time), and thermal shutdown - meets automotive functional safety requirements without external supervision. |
Applications
| ADAS Radar Power Supply | Infotainment SoC Core Rail |
|---|---|
Use Scenario: Powers 77GHz radar transceiver ASIC requiring clean, tightly regulated 1.0V/3A supply with fast transient response. IC Role / Device Role / Timing Role: Primary buck regulator delivering 1.0V from 12V battery; uses 2.1MHz switching and 0.47μH inductor for compact layout. Use Value: 34ns minimum on-time enables stable 12V→1.0V conversion; ±1% accuracy ensures ADC reference stability and RF PLL jitter <100fs. | Use Scenario: Supplies 1.8V core voltage to application processor in digital cockpit display unit with variable load (0.1A–6A). IC Role / Device Role / Timing Role: High-efficiency buck converter operating in skip mode at light load and FPWM under full load. Use Value: 10μA IQ extends sleep-mode battery life; dual-phase option allows seamless upgrade to 12A for next-gen SoCs without board redesign. |
| Automotive Telematics Module | Body Control Module (BCM) Subsystem |
Use Scenario: Provides always-on 3.3V rail for GNSS receiver and cellular modem in telematics control unit (TCU), surviving 3V cold-crank. IC Role / Device Role / Timing Role: Input-capable buck converter with 3.0V–36V range and 99% dropout; monitors status via PGOOD. Use Value: Maintains 3.3V output during engine cranking; windowed PGOOD flags brownout before modem reset, enabling graceful data save. | Use Scenario: Generates 5.0V for CAN transceivers, LIN drivers, and microcontroller peripherals in centralized BCM. IC Role / Device Role / Timing Role: Fixed-output buck regulator with 400kHz switching to minimize conducted noise on shared 12V bus. Use Value: 95.6% efficiency at 12VIN/5VOUT reduces thermal load in sealed enclosure; AEC-Q100 Grade-1 rating ensures -40°C to +125°C operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20404AFO/VY+T | 4A rated, same FC2QFN footprint and pinout, no dual-phase support, lower IQ (5μA) | Targeted at lower-power domains (e.g., sensor hubs); lacks windowed PGOOD and EN threshold accuracy | Select when output current ≤4A and cost-sensitive; not suitable for radar or SoC core rails. |
| TPS62933RNNR | 6A, 3V–36V, 15μA IQ, 2.2MHz, but no AEC-Q100, no dual-phase, no spread spectrum | Industrial/medical use only; lacks automotive qualification and fault-monitoring features like windowed PGOOD | Consider only for non-automotive designs requiring smaller solution size; not drop-in for MAX20408AFOD/VY+T. |
Compared with MAX20404AFO/VY+T and TPS62933RNNR, the MAX20408AFOD/VY+T uniquely combines AEC-Q100 qualification, 8A capability, dual-phase scalability, and windowed PGOOD in a single 3.5mm × 3.75mm package-enabling higher integration and functional safety compliance in ADAS and digital cockpit systems.
Availability
MAX20408AFOD/VY+T is available at Aetrix Electronics and suitable for automotive ADAS radar supplies, infotainment SoC core rails, and telematics always-on power systems requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.
Supply support for MAX20408AFOD/VY+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 digital signal processing semiconductors, serving automotive, industrial, communications, and healthcare markets.
The MAX20408/MAX20408E family is designed specifically for demanding automotive power applications-including ADAS, infotainment, and body electronics-where high efficiency, ultra-low quiescent current, and robust fault protection are mandatory.
FAQ
What is the maximum continuous output current supported by the MAX20408AFOD/VY+T?
The MAX20408AFOD/VY+T delivers up to 8A continuous output current under recommended thermal conditions (e.g., 4-layer EV kit, +70°C ambient). Derating applies above +70°C at 37mW/°C; actual achievable current depends on PCB copper area, airflow, and input/output voltage differential. The IC's 25mΩ high-side and 12mΩ low-side RDS(ON) enable this performance in its 3.5mm × 3.75mm FC2QFN package.
Does the MAX20408AFOD/VY+T support dual-phase operation, and what is required to implement it?
Yes, the MAX20408AFOD/VY+T supports dual-phase operation to deliver up to 20A. Implementation requires two identical MAX20408AFOD/VY+T ICs: one configured as controller (SYNCOUT left open), the other as target (SYNCOUT tied to BIAS). VEA pins are connected together, and SYNC of the target is driven by SYNCOUT of the controller. This setup enables dynamic current sharing and precise 180° phase alignment without external timing components.
What is the purpose of the windowed PGOOD feature in the MAX20408AFOD/VY+T, and how does it differ from standard PGOOD?
The windowed PGOOD in the MAX20408AFOD/VY+T provides independent rising and falling thresholds (102.75%–107.25% and 101.75%–106.25%, respectively), enabling detection of both overvoltage and undervoltage faults. Unlike standard PGOOD that asserts low only on undervoltage, this windowed behavior supports functional safety monitoring per ISO 26262, allowing system controllers to distinguish between different fault types and initiate appropriate responses-critical in ADAS domain controllers.
Can the MAX20408AFOD/VY+T operate during automotive cold-crank conditions, and what is its minimum input voltage?
Yes, the MAX20408AFOD/VY+T operates down to 3.0V input, making it fully compatible with automotive cold-crank events where battery voltage drops to ~3.2V. Its 99% maximum duty cycle ensures regulation even with minimal VIN–VOUT differential (e.g., 3.3V out from 3.35V in), and its EN input is high-voltage compatible-accepting direct connection to battery-sensed signals without level-shifting.
Is the MAX20408AFOD/VY+T AEC-Q100 qualified, and which grade does it meet?
Yes, the MAX20408AFOD/VY+T is AEC-Q100 qualified and meets Grade-1 requirements, specifying operation from –40°C to +125°C ambient temperature. This qualification covers stress testing for reliability, including HTOL, TC, UHAST, and ESD-ensuring suitability for under-hood and cabin applications such as radar modules, head units, and gateway ECUs where long-term robustness is essential.
MAX20408AFOD/VY+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.8V (3.3V)
- Voltage - Output (Max):
- 6V
- Current - Output:
- 8A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 17-FC2QFN (3.5x3.75)
MAX20408AFOD/VY+T FAQ
1.How can I place an order for MAX20408AFOD/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOD/VY+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 MAX20408AFOD/VY+T reliable?
The price and inventory of MAX20408AFOD/VY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOD/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408AFOD/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOD/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOD/VY+T?
MAX20408AFOD/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOD/VY+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 MAX20408AFOD/VY+T?
For technical support, including MAX20408AFOD/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOD/VY+T requirements.
6.How does Aetrix verify that MAX20408AFOD/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOD/VY+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 MAX20408AFOD/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408AFOD/VY+T?
All MAX20408AFOD/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOD/VY+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 MAX20408AFOD/VY+T part is unused and in its original packaging.
Return procedure for MAX20408AFOD/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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