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Analog Devices Inc./Maxim Integrated MAX20408AFOA/VY+
- Part No.:
- MAX20408AFOA/VY+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 17-PowerWFQFN
- Datasheet:
-
MAX20408AFOA/VY+.pdf
- Description:
- IC REG BUCK ADJ/0.8V 8A 17FC2QFN
- Quantity:
- Payment:
- Shipping:
Inventory:734
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Product details
Overview
MAX20408AFOA/VY+ from Analog Devices is an automotive-grade, fully integrated 36V synchronous buck converter delivering up to 8A output with internal high-side and low-side MOSFETs, 10μA quiescent current in skip mode, 2.1MHz/400kHz selectable switching frequency, and AEC-Q100 qualification for ADAS and infotainment power rails.
For engineers reviewing the MAX20408AFOA/VY+ datasheet, MAX20408AFOA/VY+ pinout, MAX20408AFOA/VY+ application, or MAX20408AFOA/VY+ equivalent, key selection criteria include dropout operation at 99% duty cycle, ±1% output voltage accuracy (E-version), dual-phase scalability to 20A, and FC2QFN-17 thermal performance in automotive environments.
Technical Context
The MAX20408AFOA/VY+ implements average current-mode control with 34ns minimum on-time, enabling stable regulation across wide input/output voltage ratios (3V–36V IN, 0.8V–10V OUT). Its dual-phase capability uses VEA pin coupling and SYNCOUT-to-SYNC interconnection to achieve dynamic current sharing and 180° out-of-phase operation between controller and target ICs.
It supports three operating modes via the SYNC pin: forced-PWM (FPWM) for constant-frequency noise control, skip mode for ultra-low IQ (10μA), and external clock synchronization (360kHz–2.6MHz). The spread-spectrum option-factory-enabled-reduces EMI by ±3% triangular modulation of the switching frequency.
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 in automotive systems. |
| Max Output Current | 8A - continuous DC output capability with thermal derating per θJA = 38.6°C/W on JEDEC board. |
| Quiescent Current | 10μA in skip mode - enables always-on subsystems (e.g., telematics wake-up logic) without battery drain. |
| Switching Frequency | 2.1MHz or 400kHz - enables compact 1.0μH inductors and <10μF ceramic output capacitance; avoids AM band interference. |
| Output Voltage Accuracy | ±1% (MAX20408E variant) - ensures precise rail regulation for sensitive processors and sensors in ADAS cameras. |
| Duty Cycle Max | 99% - sustains regulation during deep dropout (e.g., 5V OUT from 5.05V IN), critical for post-ignition hold-up. |
| PGOOD Window | 102.75% to 107.25% (rising), 101.75% to 106.25% (falling) - windowed detection prevents false asserts during transients in noisy automotive environments. |
| Operating Temp | −40°C to +125°C ambient - qualified per AEC-Q100 Grade 1, supporting under-hood and cabin-mounted ECUs. |
Pinout & Package
MAX20408AFOA/VY+ is housed in a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad (pin 17), symmetric SUP/PGND pin placement for low-impedance power loops, and RoHS-compliant "VY+" suffix indicating lead-free, halogen-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN | Enable input | High-voltage compatible (up to 42V); threshold 0.9V (typ) for reliable start-up from 12V battery with aging margin. |
| 2 BST | Bootstrap supply | Drives high-side gate; requires 0.1μF ceramic capacitor to LX for robust 100% duty-cycle operation. |
| 3, 9 SUP | IC supply input | Dual pins internally connected; bypass with 0.1μF + 4.7μF ceramics close to pins to suppress high-frequency ripple. |
| 4, 5, 7 PGND | Power ground | Three dedicated low-inductance paths for switch-node return; must be tied directly to thermal pad and PCB ground plane. |
| 6 LX | Switch node | Connects to buck inductor; high-impedance when disabled; layout critical for EMI and efficiency. |
| 10 GND | Analog ground | Separate from PGND; connects to FB/VEA/PGOOD reference; joined to PGND at single point near thermal pad. |
| 11 BIAS | 1.8V LDO output | Powers internal circuitry; requires ≥2.2μF ceramic to GND; auto-switches from SUP to OUT after startup if VOUT > 2.5V. |
| 12 FB | Voltage feedback | Programs output via resistor divider (0.8V–10V); 0.8V reference with ±12mV accuracy enables tight regulation. |
| 13 OUT | Output sense | Used only in fixed-output mode (FB tied to BIAS); senses actual rail for PGOOD and loop compensation. |
| 14 VEA | Error amplifier output | Connected between controller/target in dual-phase; enables matched current sharing and phase interleaving. |
| 15 PGOOD | Open-drain status | Windowed indicator (102.75–107.25% rising); pulled up to BIAS or VOUT; asserts low during soft-start and fault. |
| 16 SYNC | Mode control & sync | Configures FPWM (high), skip (low), or external sync (AC signal); accepts 360kHz–2.6MHz clocks. |
| 17 SYNCOUT | 180° clock output | Drives target IC's SYNC in dual-phase; tied to BIAS to configure as target; open in single-phase. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase scalability | Two MAX20408AFOA/VY+ ICs support 20A total with dynamic current sharing, 180° phase shift, and single-loop control via VEA coupling. |
| Thermally optimized FC2QFN | θJCb = 7.7°C/W (JEDEC board) enables 8A continuous operation at +70°C ambient without airflow or heatsink. |
| Windowed PGOOD | Asymmetric rising/falling thresholds (102.75–107.25% / 101.75–106.25%) prevent chatter during line/load transients in automotive power domains. |
| Ultra-low IQ skip mode | 10μA quiescent current maintains system sleep states (e.g., CAN wake-up receivers) while preserving fast wake-up response. |
| Dropout-ready 99% duty cycle | Enables regulation down to VIN − VOUT = 50mV, supporting post-cranking operation where battery sags to 5.05V for 5V rail. |
| Spread-spectrum EMI reduction | ±3% triangular modulation centered at fSW reduces peak radiated emissions by >10dB without compromising regulation stability. |
Applications
| ADAS Camera Power Supply | Infotainment SoC Core Rail |
|---|---|
Use Scenario: Powers 5MP image sensor and ISP in forward-facing ADAS camera module exposed to −40°C to +105°C under-hood temperatures. IC Role / Device Role / Timing Role: Primary 5V/3.3V buck regulator delivering 8A peak during image capture bursts; provides PGOOD to enable sensor reset sequencing. Use Value: 99% duty cycle sustains 5V output during cold-crank (5.05V battery), while ±1% accuracy ensures consistent ADC reference and pixel timing. | Use Scenario: Supplies core voltage (0.8V–1.2V) to quad-core automotive infotainment SoC with dynamic DVFS scaling and 3A–7A load steps. IC Role / Device Role / Timing Role: Adjustable-output buck converter operating at 2.1MHz; SYNC input synchronized to SoC clock domain to avoid beat frequencies. Use Value: 34ns minimum on-time supports 12V→0.8V conversion without pulse skipping; 10μA IQ extends head-unit standby time. |
| Telematics Control Unit (TCU) | Automotive Gateway ECU |
Use Scenario: Powers LTE modem, GNSS receiver, and CAN FD transceivers in always-on TCU requiring 10-year battery life in parked state. IC Role / Device Role / Timing Role: Always-on 3.3V rail generator using skip mode; EN controlled by CAN wake signal; PGOOD monitors rail integrity before modem boot. Use Value: 10μA IQ minimizes parasitic drain; windowed PGOOD prevents false resets during GSM burst transmission noise. | Use Scenario: Supplies 5V rail to multiple CAN/LIN/FlexRay transceivers and microcontroller in zonal gateway ECU handling 15+ network interfaces. IC Role / Device Role / Timing Role: Dual-phase configuration (two MAX20408AFOA/VY+) delivers 15A with interleaved ripple cancellation and shared thermal load. Use Value: Symmetric SUP/PGND pinout and θJCb = 7.7°C/W enable uniform thermal distribution across 3.5mm × 3.75mm footprint, avoiding hotspots in dense gateway PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX20408AFOA/VY+ | 8A, 2.1MHz/400kHz, 10μA IQ, FC2QFN-17, AEC-Q100 Grade 1 | Primary choice for space-constrained ADAS/infotainment with dual-phase scalability | Select for new designs requiring ≤3.75mm × 3.5mm footprint, windowed PGOOD, and guaranteed 8A at +125°C ambient. |
| MAX20410AFOA/VY+ | 10A rating, higher ILIM (14A typ), same package and features | Better suited for future-proofing or higher peak loads (e.g., radar + camera fusion ECU) | Choose when peak load exceeds 8A but board space and thermal constraints match MAX20408AFOA/VY+. |
Compared with MAX20410AFOA/VY+, the MAX20408AFOA/VY+ offers identical feature set and thermal performance in the same FC2QFN-17 package but with a lower 8A current limit and 12A typical ILIM-making it optimal for cost-sensitive, thermally constrained ADAS modules where 8A headroom suffices.
Availability
MAX20408AFOA/VY+ is available at Aetrix Electronics and suitable for automotive ADAS camera modules, infotainment SoC power supplies, telematics control units, and zonal gateway ECUs requiring stable component supply across extended temperature and long product lifecycles.
Supply support for MAX20408AFOA/VY+ 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 MAX20408/MAX20410 family is designed specifically for automotive power management-delivering high-current, low-IQ, AEC-Q100-qualified buck conversion in minimal footprints for ADAS, infotainment, and body electronics.
FAQ
What is the maximum continuous output current of the MAX20408AFOA/VY+?
The MAX20408AFOA/VY+ delivers up to 8A continuous DC output current under recommended operating conditions (TA ≤ +70°C, 4-layer JEDEC board). Derating applies above +70°C per θJA = 38.6°C/W; at +105°C ambient, usable current drops to ~5.5A. This rating assumes proper PCB thermal design with full thermal pad soldering and adequate copper area.
Does the MAX20408AFOA/VY+ support dual-phase operation, and how is it configured?
Yes, the MAX20408AFOA/VY+ supports dual-phase operation for up to 20A total output. One IC is configured as controller (SYNCOUT left open), the other as target (SYNCOUT tied to BIAS). VEA pins are connected between both devices, and SYNC of the target is driven by SYNCOUT of the controller. This enables 180° phase shift, dynamic current sharing, and interleaved ripple reduction without external controllers.
What is the purpose of the windowed PGOOD feature in the MAX20408AFOA/VY+?
MAX20408AFOA/VY+ implements a windowed PGOOD with asymmetric thresholds: rising edge triggers at 102.75–107.25% of nominal VOUT, falling edge at 101.75–106.25%. This prevents false assertions during fast transients (e.g., load dump recovery or CAN bus noise) while ensuring reliable rail monitoring for safety-critical ADAS functions like camera initialization.
Can the MAX20408AFOA/VY+ operate with input voltage below 3.0V?
No-the absolute minimum input voltage for functional operation is 3.0V per the Recommended Operating Conditions table. Below this, EN threshold (0.9V typ) and internal bias generation cannot be guaranteed. However, the device withstands down to −0.3V on SUP/EN pins per Absolute Maximum Ratings, and supports cold-crank scenarios where battery recovers to 3.0V+ within milliseconds.
How does the spread-spectrum option reduce EMI in the MAX20408AFOA/VY+?
The factory-enabled spread-spectrum option modulates the switching frequency by ±3% around the nominal value (2.1MHz or 400kHz) using a 4.5kHz triangular waveform. This spreads energy across a 126kHz bandwidth (at 2.1MHz), lowering peak radiated emissions by >10dB compared to fixed-frequency operation-critical for passing CISPR 25 Class 5 automotive EMI tests without added shielding.
MAX20408AFOA/VY+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 17-PowerWFQFN
- Packaging:
- Tray
- 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 (5V)
- 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)
MAX20408AFOA/VY+ FAQ
1.How can I place an order for MAX20408AFOA/VY+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20408AFOA/VY+ 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 MAX20408AFOA/VY+ reliable?
The price and inventory of MAX20408AFOA/VY+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20408AFOA/VY+ is usually 5 days.
3.What payment methods are accepted for MAX20408AFOA/VY+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20408AFOA/VY+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20408AFOA/VY+?
MAX20408AFOA/VY+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20408AFOA/VY+ 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 MAX20408AFOA/VY+?
For technical support, including MAX20408AFOA/VY+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20408AFOA/VY+ requirements.
6.How does Aetrix verify that MAX20408AFOA/VY+ is sourced from the original manufacturer or authorized distributors?
All MAX20408AFOA/VY+ 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 MAX20408AFOA/VY+ meets industry standards.
7.What is the process for return or replacement of MAX20408AFOA/VY+?
All MAX20408AFOA/VY+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX20408AFOA/VY+, 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 MAX20408AFOA/VY+ part is unused and in its original packaging.
Return procedure for MAX20408AFOA/VY+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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