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Analog Devices Inc./Maxim Integrated MAX20408AFOG/VY+T
- Part No.:
- MAX20408AFOG/VY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOG/VY+T.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX20408AFOG/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 range, featuring 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for use in ADAS power rails.
For engineers reviewing the MAX20408AFOG/VY+T datasheet, MAX20408AFOG/VY+T pinout, MAX20408AFOG/VY+T application, or MAX20408AFOG/VY+T equivalent, key selection criteria include its dual-phase capability (up to 20A), windowed PGOOD with ±5% accuracy, 34ns minimum on-time for high step-down ratios, and FC2QFN-17 package with symmetric SUP/PGND layout for EMI control.
Technical Context
The MAX20408AFOG/VY+T implements average current-mode control with 34ns minimum on-time and 99% maximum duty cycle, enabling stable operation during automotive cold-crank (3.0V input) and load-dump (42V transient) conditions. It supports three SYNC modes: forced-PWM, skip mode, and external clock synchronization - with spread-spectrum modulation (±3%) available as factory option to reduce radiated EMI.
Dual-phase configuration uses VEA pin coupling and SYNCOUT-to-SYNC interconnection to achieve 180° out-of-phase switching and dynamic current sharing between two ICs. The device integrates a 1.8V BIAS LDO, EN threshold accuracy of ±75mV (0.9V typ), and windowed PGOOD with rising/falling thresholds at 105%/104% and 95%/93% of nominal VOUT respectively for enhanced rail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0V to 36V - supports full automotive battery range including cold-crank (3V) and load dump (42V absolute max). |
| Output Current | 8A continuous - enables single-chip 5V/3.3V supplies for radar modules or domain controllers without external FETs. |
| Quiescent Current | 10μA in skip mode - extends battery life in always-on vehicle subsystems such as telematics or body ECUs. |
| Switching Frequency | 2.1MHz or 400kHz fixed - allows compact 1.0μH inductors and <10μF ceramic output caps; avoids AM band interference. |
| Output Voltage Accuracy | ±1% over -40°C to +125°C - ensures reliable ADC reference or FPGA core voltage regulation in ADAS sensors. |
| Minimum On-Time | 34ns - supports 12V-to-1.8V conversion at 2.1MHz without pulse-skipping, maintaining regulation under light loads. |
| Thermal Protection | 175°C shutdown with 20°C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
Pinout & Package
MAX20408AFOG/VY+T is housed in a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 16). Symmetric SUP and PGND pin placement minimizes high-current loop area for superior EMI performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable Input | High-voltage compatible (3V–36V); 0.9V typical threshold enables direct connection to automotive wake-up signals. |
| 2 BST | Bootstrap Supply | Connects 0.1μF ceramic capacitor to LX; powers high-side gate driver during switching transitions. |
| 3, 9 SUP | IC Power Input | Dual pins internally connected; bypassed with 0.1μF + 4.7μF ceramics to PGND for low-impedance input filtering. |
| 4, 5, 7 PGND | Power Ground | Three dedicated low-impedance ground paths for high-current return; must be tied together near thermal pad. |
| 6 LX | Switch Node | Connects to buck inductor; high-impedance when disabled; requires tight layout to minimize EMI and ringing. |
| 8 GND | Analog Ground | Separate from PGND; connects to PCB ground plane at single-point star node to isolate noise-sensitive feedback path. |
| 11 BIAS | LDO Output | 1.8V internal regulator output; supplies internal circuitry and requires ≥2.2μF ceramic cap to GND for stability. |
| 12 FB | Feedback Input | Connects to resistor divider for adjustable VOUT (0.8V–10V) or to BIAS for fixed-output configurations. |
| 13 OUT | Output Sense | Used only when FB is tied to BIAS; enables accurate remote sensing of regulated output voltage. |
| 14 VEA | Error Amplifier Output | Shared between controller/target in dual-phase mode; enables precise current balancing and phase interleaving. |
| 15 PGOOD | Power-Good Indicator | Open-drain output with windowed logic (93–105% VOUT); asserts low during soft-start and fault conditions. |
| 16 SYNC | Synchronization Input | Selects FPWM (high), skip mode (low), or external clock sync; accepts 1.7–2.6MHz (2.1MHz mode) or 360–600kHz (400kHz mode). |
| 17 SYNCOUT | Phase Clock Output | 180° out-of-phase clock signal; used to configure target IC in dual-phase setup; left open in single-phase operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase operation | Enables 20A total output using two MAX20408AFOG/VY+T ICs with dynamic current sharing and 180° phase shift - reduces input/output ripple by >70% vs. single-phase. |
| Windowed PGOOD | Monitors output voltage within ±5% window (105%/95% rising/falling thresholds) - improves system-level fault detection reliability over standard open-drain PGOOD. |
| Spread-spectrum modulation | ±3% frequency dithering centered at fSW - lowers peak EMI emissions by up to 10dB without requiring additional filtering components. |
| Thermally optimized FC2QFN | θJB = 16.3°C/W on 4-layer JEDEC board - enables 8A operation at +85°C ambient without forced airflow or heatsink. |
| Accurate EN threshold | 0.9V ±75mV enable threshold - eliminates need for external level-shifting circuits when interfacing with 3.3V microcontrollers or CAN transceivers. |
Applications
| ADAS Radar Power Supply | Automotive Infotainment SoC Core Rail |
|---|---|
|
Use Scenario: Powers 77GHz radar transceiver ASICs requiring clean, tightly regulated 1.2V/1.8V rails with fast transient response. IC Role / Device Role / Timing Role: Primary DC-DC converter providing isolated, low-noise core voltage with PGOOD monitoring and thermal shutdown. Use Value: 34ns minimum on-time and average current-mode control maintain regulation during rapid load steps (0–6A in <1μs), reducing need for large bulk capacitance. |
Use Scenario: Supplies 5V/3.3V rails to infotainment head-unit processors, display drivers, and audio codecs in start-stop vehicles. IC Role / Device Role / Timing Role: High-efficiency buck regulator operating in skip mode during standby to meet ISO 16750-2 quiescent current requirements. Use Value: 10μA IQ and 94.3% efficiency at 12VIN/5VOUT/2.1MHz extend battery runtime during extended parking mode. |
| Domain Controller Auxiliary Rail | Body Control Module (BCM) Subsystem |
|
Use Scenario: Generates isolated 3.3V auxiliary supply for CAN FD transceivers, Ethernet PHYs, and safety watchdogs in zonal architecture. IC Role / Device Role / Timing Role: Dual-phase configured MAX20408AFOG/VY+T pair delivers 12A with interleaved switching to minimize conducted EMI on shared PCB layers. Use Value: SYNCOUT-driven 180° phase alignment cuts input capacitor RMS current by 50%, allowing smaller 1210-size X7R ceramics. |
Use Scenario: Powers door module MCUs, LED drivers, and LIN transceivers where space, thermal margin, and AEC-Q100 compliance are critical. IC Role / Device Role / Timing Role: Single-chip 8A buck converter replacing discrete solutions to reduce BOM count and improve MTBF. Use Value: FC2QFN-17 package with symmetric SUP/PGND layout achieves <15mVpp output ripple at 2.1MHz - eliminates need for post-regulation LDOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOG/VY+ | Same die, identical electrical specs, but lacks factory-programmed spread-spectrum option. | No EMI reduction benefit; suitable for non-EMI-sensitive interior modules (e.g., seat control). | Select when spread-spectrum is unnecessary and cost optimization is prioritized. |
| TPS62933RGER | 6A output, 3V–36V input, 15μA IQ, no dual-phase support, different pinout (16-pin VQFN). | Limited to single-rail 6A designs; lacks windowed PGOOD and AEC-Q100 Grade 0 rating. | Choose for lower-current applications where footprint compatibility is not required and dual-phase scalability is unnecessary. |
Compared with MAX20408AFOG/VY+, the MAX20408AFOG/VY+ offers identical functionality without spread-spectrum, while TPS62933RGER provides lower current and no dual-phase capability - making MAX20408AFOG/VY+ the only option supporting scalable 20A designs with automotive-grade reliability and EMI control.
Availability
MAX20408AFOG/VY+T is available at Aetrix Electronics and suitable for automotive ADAS radar supplies, infotainment SoC core rails, and domain controller auxiliary power requiring stable component supply across long production lifecycles.
Supply support for MAX20408AFOG/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 with precision power, sensing, and connectivity solutions.
The MAX20408AFOG/VY+T belongs to Analog Devices' automotive power management portfolio, engineered specifically for demanding ADAS and zonal E/E architecture applications requiring AEC-Q100 Grade 0 reliability, ultra-low IQ, and scalable multi-phase operation.
FAQ
What is the maximum input voltage the MAX20408AFOG/VY+T can withstand during load dump events?
The MAX20408AFOG/VY+T has an absolute maximum SUP-to-PGND rating of +42V, enabling robust operation during ISO 7637-2 Pulse 5a load dump transients without external protection circuitry. This rating is validated per AEC-Q100 stress testing and applies across the full -40°C to +125°C junction temperature range. The device maintains regulation down to 3.0V input, covering cold-crank conditions. No external TVS or series FET is required for standard 12V automotive systems.
Does the MAX20408AFOG/VY+T support dual-phase operation out of the box?
Yes, the MAX20408AFOG/VY+T supports dual-phase operation natively via its VEA and SYNCOUT pins. Two MAX20408AFOG/VY+T ICs can be configured as controller and target with 180° phase shift, dynamic current sharing, and synchronized soft-start. No firmware or external timing controller is needed - only proper PCB routing of VEA and SYNCOUT/SYNC connections per the datasheet layout guidelines. The feature is enabled by internal average current-mode control architecture.
What is the purpose of the windowed PGOOD function in the MAX20408AFOG/VY+T?
The windowed PGOOD in the MAX20408AFOG/VY+T monitors output voltage within a defined upper and lower threshold (e.g., 93–105% of nominal VOUT), unlike standard PGOOD that only detects undervoltage. This allows detection of both overvoltage and undervoltage faults - critical for protecting downstream processors and sensors in ADAS systems. The windowed behavior is factory-configured and does not require external components or configuration registers.
Can the MAX20408AFOG/VY+T operate with a 2.1MHz switching frequency and still achieve high efficiency?
Yes, the MAX20408AFOG/VY+T achieves up to 94.3% efficiency at 12VIN/5VOUT with 2.1MHz switching, verified across load range and temperature. This is enabled by low RDS(ON) MOSFETs (25mΩ HS / 12mΩ LS), optimized gate drive, and minimal dead-time losses. Efficiency remains >88% even at 100mA load in forced-PWM mode, and drops only to ~92% at full 8A due to conduction losses - all within automotive thermal limits.
Is the MAX20408AFOG/VY+T pin-compatible with other devices in the MAX204xx family?
Yes, the MAX20408AFOG/VY+T shares the same 17-pin FC2QFN footprint and pinout with MAX20404/MAX20405/MAX20406 (4A–6A variants) and MAX20410AFOG/VY+T (10A variant), enabling scalable power design with no PCB redesign. All share identical SUP, PGND, EN, BST, LX, FB, and SYNC pin assignments. Differences are limited to internal current-limit thresholds and optional features like spread-spectrum - which do not affect layout or basic functionality.
MAX20408AFOG/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):
- 10V
- Current - Output:
- 8A
- Frequency - Switching:
- 400kHz
- 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)
MAX20408AFOG/VY+T FAQ
1.How can I place an order for MAX20408AFOG/VY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOG/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 MAX20408AFOG/VY+T reliable?
The price and inventory of MAX20408AFOG/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 MAX20408AFOG/VY+T is usually 5 days.
3.What payment methods are accepted for MAX20408AFOG/VY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOG/VY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOG/VY+T?
MAX20408AFOG/VY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOG/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 MAX20408AFOG/VY+T?
For technical support, including MAX20408AFOG/VY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOG/VY+T requirements.
6.How does Aetrix verify that MAX20408AFOG/VY+T is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOG/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 MAX20408AFOG/VY+T meets industry standards.
7.What is the process for return or replacement of MAX20408AFOG/VY+T?
All MAX20408AFOG/VY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOG/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 MAX20408AFOG/VY+T part is unused and in its original packaging.
Return procedure for MAX20408AFOG/VY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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